LINQ クエリの例
公開日: 2017年1月
対象: Dynamics 365 (online)、Dynamics 365 (on-premises)、Dynamics CRM 2016、Dynamics CRM Online
ここでは、LINQ クエリの多数のサンプルを提供します。 完全なサンプルについては、「サンプル: 複雑な LINQ クエリ」を参照してください。
このトピックの内容
シンプルな Where 句
結合とシンプルな Where 句
Distinct 演算子の使用
シンプルな内部結合
自己結合
二重結合と複数結合
エンティティ フィールドを使用した結合
遅延バインド左結合
等価演算子の使用
非等価演算子の使用
Where 句によるメソッドベース LINQ クエリの使用
より大きい演算子の使用
以上または以下演算子の使用
"含む" 演算子の使用
"含まない" 演算子の使用
StartsWith および EndsWith 演算子の使用
And および Or 演算子の使用
OrderBy 演算子の使用
First および Single 演算子の使用
書式設定された値の取得
Skip および Take 演算子の使用 (ページングなし)
FirstOrDefault および SingleOrDefault 演算子の使用
リンクされたエンティティの条件に基づく自己結合の使用
Where 句での変換の使用
ページングの並べ替えの使用
関連するエンティティ列の取得 (一対多の関係の場合)
.value による属性値の取得
複数のプロジェクション (新しいデータ型を別の型にキャスト)
GetAttributeValue メソッドの使用
Math メソッドの使用
複数の Select 句と Where 句の使用
SelectMany の使用
文字列操作の使用
2 つの Where 句の使用
関連するレコードを取得するために LoadProperty を使用します。
シンプルな Where 句
次のサンプルは、Name に "Contoso" が含まれている取引先企業の一覧を取得する方法を示します。
using (ServiceContext svcContext = new ServiceContext(_serviceProxy))
{
var query_where1 = from a in svcContext.AccountSet
where a.Name.Contains("Contoso")
select a;
foreach (var a in query_where1)
{
System.Console.WriteLine(a.Name + " " + a.Address1_City);
}
}
Using svcContext As New ServiceContext(_serviceProxy)
Dim query_where1 = From c In svcContext.AccountSet _
Where c.Name.Contains("Contoso") _
Select c
For Each c In query_where1
Console.WriteLine(c.Name & " " & c.Address1_City)
Next c
End Using
次のサンプルは、Name に "Contoso" が含まれ、Address1_City が “Redmond” である取引先企業の一覧を取得する方法を示します。
using (ServiceContext svcContext = new ServiceContext(_serviceProxy))
{
var query_where2 = from a in svcContext.AccountSet
where a.Name.Contains("Contoso")
where a.Address1_City == "Redmond"
select a;
foreach (var a in query_where2)
{
System.Console.WriteLine(a.Name + " " + a.Address1_City);
}
}
Using svcContext As New ServiceContext(_serviceProxy)
Dim query_where2 = From c In svcContext.AccountSet _
Where c.Name.Contains("Contoso") _
Where c.Address1_City.Equals("Redmond") _
Select c
For Each c In query_where2
Console.WriteLine(c.Name & " " & c.Address1_City)
Next c
End Using
結合とシンプルな Where 句
次のサンプルは、取引先企業の Name に "Contoso" が含まれ、取引先担当者の LastName に "Smith" が含まれ、取引先担当者が取引先企業の取引先責任者である、取引先企業の Name と取引先担当者の LastName を取得する方法を示します。
using (ServiceContext svcContext = new ServiceContext(_serviceProxy))
{
var query_where3 = from c in svcContext.ContactSet
join a in svcContext.AccountSet
on c.ContactId equals a.PrimaryContactId.Id
where a.Name.Contains("Contoso")
where c.LastName.Contains("Smith")
select new
{
account_name = a.Name,
contact_name = c.LastName
};
foreach (var c in query_where3)
{
System.Console.WriteLine("acct: " +
c.account_name +
"\t\t\t" +
"contact: " +
c.contact_name);
}
}
Using svcContext As New ServiceContext(_serviceProxy)
Dim query_where3 = From c In svcContext.ContactSet _
Join a In svcContext.AccountSet _
On c.ContactId Equals a.account_primary_contact.Id _
Where a.Name.Contains("Contoso") _
Where c.LastName.Contains("Smith") _
Select New With {Key .account_name = a.Name,
Key .contact_name = c.LastName}
For Each c In query_where3
Console.WriteLine("acct: " & c.account_name & vbTab & vbTab _
& vbTab & "contact: " & c.contact_name)
Next c
End Using
Distinct 演算子の使用
次のサンプルは、取引先担当者の姓の個別一覧を取得する方法を示します。 重複がある名前でも、一覧には 1 回だけ出現します。
using (ServiceContext svcContext = new ServiceContext(_serviceProxy))
{
var query_distinct = (from c in svcContext.ContactSet
select c.LastName).Distinct();
foreach (var c in query_distinct)
{
System.Console.WriteLine(c);
}
}
Using svcContext As New ServiceContext(_serviceProxy)
Dim query_distinct = ( _
From c In svcContext.ContactSet _
Select c.LastName).Distinct()
For Each c In query_distinct
Console.WriteLine(c)
Next c
End Using
シンプルな内部結合
次のサンプルは、取引先企業の取引先責任者の一覧に含まれる取引先企業および取引先担当者についての情報を取得する方法を示します。
using (ServiceContext svcContext = new ServiceContext(_serviceProxy))
{
var query_join1 = from c in svcContext.ContactSet
join a in svcContext.AccountSet
on c.ContactId equals a.PrimaryContactId.Id
select new
{
c.FullName,
c.Address1_City,
a.Name,
a.Address1_Name
};
foreach (var c in query_join1)
{
System.Console.WriteLine("acct: " +
c.Name +
"\t\t\t" +
"contact: " +
c.FullName);
}
}
Using svcContext As New ServiceContext(_serviceProxy)
Dim query_join1 = From c In svcContext.ContactSet _
Join a In svcContext.AccountSet _
On c.ContactId Equals a.account_primary_contact.Id _
Select New With {Key c.FullName, Key c.Address1_City,
Key a.Name, Key a.Address1_Name}
For Each c In query_join1
Console.WriteLine("acct: " & c.Name & vbTab & vbTab _
& vbTab & "contact: " & c.FullName)
Next c
End Using
自己結合
次のサンプルは、取引先企業の親会社である取引先企業についての情報を取得する方法を示します。
using (ServiceContext svcContext = new ServiceContext(_serviceProxy))
{
var query_join5 = from a in svcContext.AccountSet
join a2 in svcContext.AccountSet
on a.ParentAccountId.Id equals a2.AccountId
select new
{
account_name = a.Name,
account_city = a.Address1_City
};
foreach (var c in query_join5)
{
System.Console.WriteLine(c.account_name + " " + c.account_city);
}
}
Using svcContext As New ServiceContext(_serviceProxy)
Dim query_join5 = From a In svcContext.AccountSet _
Join a2 In svcContext.AccountSet _
On a.ParentAccountId.Id Equals a2.AccountId _
Select New With {
Key .account_name = a.Name,
Key .account_city = a.Address1_City
}
For Each c In query_join5
Console.WriteLine(c.account_name & " " & c.account_city)
Next c
End Using
二重結合と複数結合
次のサンプルは、取引先担当者が取引先企業の取引先責任者であり、潜在顧客が取引先企業の元の潜在顧客である、取引先企業、取引先担当者、潜在顧客の情報を取得する方法を示します。
using (ServiceContext svcContext = new ServiceContext(_serviceProxy))
{
var query_join4 = from a in svcContext.AccountSet
join c in svcContext.ContactSet
on a.PrimaryContactId.Id equals c.ContactId
join l in svcContext.LeadSet
on a.OriginatingLeadId.Id equals l.LeadId
select new
{
contact_name = c.FullName,
account_name = a.Name,
lead_name = l.FullName
};
foreach (var c in query_join4)
{
System.Console.WriteLine(c.contact_name +
" " +
c.account_name +
" " +
c.lead_name);
}
}
Using svcContext As New ServiceContext(_serviceProxy)
Dim query_join4 = From a In svcContext.AccountSet _
Join c In svcContext.ContactSet _
On a.PrimaryContactId.Id Equals c.ContactId _
Join l In svcContext.LeadSet _
On a.OriginatingLeadId.Id Equals l.LeadId _
Select New With {Key .contact_name = c.FullName,
Key .account_name = a.Name,
Key .lead_name = l.FullName}
For Each c In query_join4
Console.WriteLine(c.contact_name & " " & c.account_name _
& " " & c.lead_name)
Next c
End Using
次のサンプルは、取引先企業が別の取引先企業の親企業であり、取引先担当者がその取引先企業の取引先責任者である、取引先企業および取引先担当者の情報を取得する方法を示します。
using (ServiceContext svcContext = new ServiceContext(_serviceProxy))
{
var query_join6 = from c in svcContext.ContactSet
join a in svcContext.AccountSet
on c.ContactId equals a.PrimaryContactId.Id
join a2 in svcContext.AccountSet
on a.ParentAccountId.Id equals a2.AccountId
select new
{
contact_name = c.FullName,
account_name = a.Name
};
foreach (var c in query_join6)
{
System.Console.WriteLine(c.contact_name + " " + c.account_name);
}
}
Using svcContext As New ServiceContext(_serviceProxy)
Dim query_join6 = From c In svcContext.ContactSet _
Join a In svcContext.AccountSet _
On c.ContactId Equals a.PrimaryContactId.Id _
Join a2 In svcContext.AccountSet _
On a.ParentAccountId.Id Equals a2.AccountId _
Select New With {Key .contact_name = c.FullName,
Key .account_name = a.Name}
For Each c In query_join6
Console.WriteLine(c.contact_name & " " & c.account_name)
Next c
End Using
エンティティ フィールドを使用した結合
次のサンプルは、取引先企業の情報を一覧から取得する方法を示します
using (ServiceContext svcContext = new ServiceContext(_serviceProxy))
{
var list_join = (from a in svcContext.AccountSet
join c in svcContext.ContactSet
on a.PrimaryContactId.Id equals c.ContactId
where a.Name == "Contoso Ltd" &&
a.Address1_Name == "Contoso Pharmaceuticals"
select a).ToList();
foreach (var c in list_join)
{
System.Console.WriteLine("Account " + list_join[0].Name
+ " and it's primary contact "
+ list_join[0].PrimaryContactId.Id);
}
}
Using svcContext As New ServiceContext(_serviceProxy)
Dim list_join = ( _
From a In svcContext.AccountSet _
Join c In svcContext.ContactSet _
On a.PrimaryContactId.Id Equals c.ContactId _
Where a.Name.Equals("Contoso Ltd") _
And a.Address1_Name.Equals("Contoso Pharmaceuticals") _
Select a).ToList()
For Each c In list_join
Console.WriteLine("Account " & list_join(0).Name _
& " and it's primary contact " _
& list_join(0).PrimaryContactId.Id.ToString())
Next c
End Using
遅延バインド左結合
次のサンプルは、左結合を示します。 左結合は、2 つのソースから子を持つ親と持たない親を返します。 親と子の間に関連付けがありますが、実際に子が存在するとは限りません。
using (ServiceContext svcContext = new ServiceContext(_serviceProxy))
{
var query_join8 = from a in svcContext.AccountSet
join c in svcContext.ContactSet
on a.PrimaryContactId.Id equals c.ContactId
into gr
from c_joined in gr.DefaultIfEmpty()
select new
{
contact_name = c_joined.FullName,
account_name = a.Name
};
foreach (var c in query_join8)
{
System.Console.WriteLine(c.contact_name + " " + c.account_name);
}
}
Using svcContext As New ServiceContext(_serviceProxy)
Dim query_join8 = From a In svcContext.AccountSet _
Group Join c In svcContext.ContactSet _
On a.PrimaryContactId.Id Equals c.ContactId Into gr = _
Group From c_joined In gr.DefaultIfEmpty() _
Select New With {Key .contact_name = c_joined.FullName,
Key .account_name = a.Name}
For Each c In query_join8
Console.WriteLine(c.contact_name & " " & c.account_name)
Next c
End Using
等価演算子の使用
次のサンプルは、FirstName が "Colin" である取引先担当者の一覧を取得する方法を示します。
using (ServiceContext svcContext = new ServiceContext(_serviceProxy))
{
var query_equals1 = from c in svcContext.ContactSet
where c.FirstName.Equals("Colin")
select new
{
c.FirstName,
c.LastName,
c.Address1_City
};
foreach (var c in query_equals1)
{
System.Console.WriteLine(c.FirstName +
" " + c.LastName +
" " + c.Address1_City);
}
}
Using svcContext As New ServiceContext(_serviceProxy)
Dim query_equals1 = From c In svcContext.ContactSet _
Where c.FirstName.Equals("Colin") _
Select New With {Key c.FirstName,
Key c.LastName,
Key c.Address1_City}
For Each c In query_equals1
Console.WriteLine(c.FirstName & " " & c.LastName & " " _
& c.Address1_City)
Next c
End Using
次のサンプルは、FamilyStatusCode が "3" である取引先担当者の一覧を取得する方法を示します。 これは、離婚 の 婚姻区分 オプションに相応します。
using (ServiceContext svcContext = new ServiceContext(_serviceProxy))
{
var query_equals2 = from c in svcContext.ContactSet
where c.FamilyStatusCode.Equals(3)
select new
{
c.FirstName,
c.LastName,
c.Address1_City
};
foreach (var c in query_equals2)
{
System.Console.WriteLine(c.FirstName +
" " + c.LastName +
" " + c.Address1_City);
}
}
Using svcContext As New ServiceContext(_serviceProxy)
Dim query_equals2 = From c In svcContext.ContactSet _
Where c.FamilyStatusCode.Equals(3) _
Select New With {Key c.FirstName,
Key c.LastName,
Key c.Address1_City}
For Each c In query_equals2
Console.WriteLine(c.FirstName & " " & c.LastName & " " _
& c.Address1_City)
Next c
End Using
非等価演算子の使用
次のサンプルは、Address1_City が "Redmond" でない取引先担当者の一覧を取得する方法を示します。
using (ServiceContext svcContext = new ServiceContext(_serviceProxy))
{
var query_ne1 = from c in svcContext.ContactSet
where c.Address1_City != "Redmond"
select new
{
c.FirstName,
c.LastName,
c.Address1_City
};
foreach (var c in query_ne1)
{
System.Console.WriteLine(c.FirstName + " " +
c.LastName + " " + c.Address1_City);
}
}
Using svcContext As New ServiceContext(_serviceProxy)
Dim query_ne1 = From c In svcContext.ContactSet _
Where c.Address1_City IsNot "Redmond" _
Select New With {Key c.FirstName,
Key c.LastName,
Key c.Address1_City}
For Each c In query_ne1
Console.WriteLine(c.FirstName & " " & c.LastName _
& " " & c.Address1_City)
Next c
End Using
次のサンプルは、FirstName が "Colin" でない取引先担当者の一覧を取得する方法を示します。
using (ServiceContext svcContext = new ServiceContext(_serviceProxy))
{
var query_ne2 = from c in svcContext.ContactSet
where !c.FirstName.Equals("Colin")
select new
{
c.FirstName,
c.LastName,
c.Address1_City
};
foreach (var c in query_ne2)
{
System.Console.WriteLine(c.FirstName + " " +
c.LastName + " " + c.Address1_City);
}
}
Using svcContext As New ServiceContext(_serviceProxy)
Dim query_ne2 = From c In svcContext.ContactSet _
Where (Not c.FirstName.Equals("Colin")) _
Select New With {Key c.FirstName,
Key c.LastName,
Key c.Address1_City}
For Each c In query_ne2
Console.WriteLine(c.FirstName & " " & c.LastName & " " _
& c.Address1_City)
Next c
End Using
Where 句によるメソッドベース LINQ クエリの使用
次のサンプルは、LastName に "Smith" または “Smi” が含まれている取引先担当者の一覧を取得する方法を示します。
using (ServiceContext svcContext = new ServiceContext(_serviceProxy))
{
var methodResults = svcContext.ContactSet
.Where(a => a.LastName == "Smith");
var methodResults2 = svcContext.ContactSet
.Where(a => a.LastName.StartsWith("Smi"));
Console.WriteLine();
Console.WriteLine("Method query using Lambda expression");
Console.WriteLine("---------------------------------------");
foreach (var a in methodResults)
{
Console.WriteLine("Name: " + a.FirstName + " " + a.LastName);
}
Console.WriteLine("---------------------------------------");
Console.WriteLine("Method query 2 using Lambda expression");
Console.WriteLine("---------------------------------------");
foreach (var a in methodResults2)
{
Console.WriteLine("Name: " + a.Attributes["firstname"] +
" " + a.Attributes["lastname"]);
}
}
Using svcContext As New ServiceContext(_serviceProxy)
Dim methodResults = svcContext.ContactSet _
.Where(Function(a) a.LastName.Equals("Smith"))
Dim methodResults2 = svcContext.ContactSet _
.Where(Function(a) a.LastName.StartsWith("Smi"))
Console.WriteLine()
Console.WriteLine("Method query using Lambda expression")
Console.WriteLine("---------------------------------------")
For Each a In methodResults
Console.WriteLine("Name: " & a.FirstName & " " & a.LastName)
Next a
Console.WriteLine("---------------------------------------")
Console.WriteLine("Method query 2 using Lambda expression")
Console.WriteLine("---------------------------------------")
For Each a In methodResults2
Console.WriteLine("Name: " & a.Attributes("firstname").ToString() _
& " " & a.Attributes("lastname").ToString())
Next a
End Using
より大きい演算子の使用
次のサンプルは、Anniversary の日付が 2010 年 2 月 5 日以降の取引先担当者の一覧を取得する方法を示します。
using (ServiceContext svcContext = new ServiceContext(_serviceProxy))
{
var query_gt1 = from c in svcContext.ContactSet
where c.Anniversary > new DateTime(2010, 2, 5)
select new
{
c.FirstName,
c.LastName,
c.Address1_City
};
foreach (var c in query_gt1)
{
System.Console.WriteLine(c.FirstName + " " +
c.LastName + " " + c.Address1_City);
}
}
Using svcContext As New ServiceContext(_serviceProxy)
Dim query_gt1 = From c In svcContext.ContactSet _
Where c.Anniversary > New Date(2010, 2, 5) _
Select New With {Key c.FirstName,
Key c.LastName,
Key c.Address1_City}
For Each c In query_gt1
Console.WriteLine(c.FirstName & " " & c.LastName _
& " " & c.Address1_City)
Next c
End Using
次のサンプルは、CreditLimit が $20,000 より大きい取引先担当者を取得する方法を示します。
using (ServiceContext svcContext = new ServiceContext(_serviceProxy))
{
var query_gt2 = from c in svcContext.ContactSet
where c.CreditLimit.Value > 20000
select new
{
c.FirstName,
c.LastName,
c.Address1_City
};
foreach (var c in query_gt2)
{
System.Console.WriteLine(c.FirstName + " " +
c.LastName + " " + c.Address1_City);
}
}
Using svcContext As New ServiceContext(_serviceProxy)
Dim query_gt2 = From c In svcContext.ContactSet _
Where c.CreditLimit.Value > 20000 _
Select New With {Key c.FirstName,
Key c.LastName,
Key c.Address1_City}
For Each c In query_gt2
Console.WriteLine(c.FirstName & " " & c.LastName _
& " " & c.Address1_City)
Next c
End Using
以上または以下演算子の使用
次のサンプルは、CreditLimit が $200 より大きく $400 未満の取引先担当者を取得する方法を示します。
using (ServiceContext svcContext = new ServiceContext(_serviceProxy))
{
var query_gele1 = from c in svcContext.ContactSet
where c.CreditLimit.Value >= 200 &&
c.CreditLimit.Value <= 400
select new
{
c.FirstName,
c.LastName
};
foreach (var c in query_gele1)
{
System.Console.WriteLine(c.FirstName + " " + c.LastName);
}
}
Using svcContext As New ServiceContext(_serviceProxy)
Dim query_gele1 = From c In svcContext.ContactSet _
Where c.CreditLimit.Value >= 200 _
AndAlso c.CreditLimit.Value <= 400 _
Select New With {Key c.FirstName,
Key c.LastName}
For Each c In query_gele1
Console.WriteLine(c.FirstName & " " & c.LastName)
Next c
End Using
"含む" 演算子の使用
次のサンプルは、Description が "Alpine" である取引先担当者の一覧を取得する方法を示します。
using (ServiceContext svcContext = new ServiceContext(_serviceProxy))
{
var query_contains1 = from c in svcContext.ContactSet
where c.Description.Contains("Alpine")
select new
{
c.FirstName,
c.LastName
};
foreach (var c in query_contains1)
{
System.Console.WriteLine(c.FirstName + " " + c.LastName);
}
}
Using svcContext As New ServiceContext(_serviceProxy)
Dim query_contains1 = From c In svcContext.ContactSet _
Where c.Description.Contains("Alpine") _
Select New With {Key c.FirstName,
Key c.LastName}
For Each c In query_contains1
Console.WriteLine(c.FirstName & " " & c.LastName)
Next c
End Using
"含まない" 演算子の使用
次のサンプルは、Description が "Coho" でない取引先担当者の一覧を取得する方法を示します。
using (ServiceContext svcContext = new ServiceContext(_serviceProxy))
{
var query_contains2 = from c in svcContext.ContactSet
where !c.Description.Contains("Coho")
select new
{
c.FirstName,
c.LastName
};
foreach (var c in query_contains2)
{
System.Console.WriteLine(c.FirstName + " " + c.LastName);
}
}
Using svcContext As New ServiceContext(_serviceProxy)
Dim query_contains2 = From c In svcContext.ContactSet _
Where (Not c.Description.Contains("Coho")) _
Select New With {Key c.FirstName,
Key c.LastName}
For Each c In query_contains2
Console.WriteLine(c.FirstName.ToString() & " " _
& c.LastName.ToString())
Next c
End Using
StartsWith および EndsWith 演算子の使用
次のサンプルは、FirstName が “Bri” で始まる取引先担当者を取得する方法を示します。
using (ServiceContext svcContext = new ServiceContext(_serviceProxy))
{
var query_startswith1 = from c in svcContext.ContactSet
where c.FirstName.StartsWith("Bri")
select new
{
c.FirstName,
c.LastName
};
foreach (var c in query_startswith1)
{
System.Console.WriteLine(c.FirstName + " " + c.LastName);
}
}
Using svcContext As New ServiceContext(_serviceProxy)
Dim query_startswith1 = From c In svcContext.ContactSet _
Where c.FirstName.StartsWith("Bri") _
Select New With {Key c.FirstName,
Key c.LastName}
For Each c In query_startswith1
Console.WriteLine(c.FirstName.ToString() & " " _
& c.LastName.ToString())
Next c
End Using
次のサンプルは、LastName が “cox” で終わる取引先担当者を取得する方法を示します。
using (ServiceContext svcContext = new ServiceContext(_serviceProxy))
{
var query_endswith1 = from c in svcContext.ContactSet
where c.LastName.EndsWith("cox")
select new
{
c.FirstName,
c.LastName
};
foreach (var c in query_endswith1)
{
System.Console.WriteLine(c.FirstName + " " + c.LastName);
}
}
Using svcContext As New ServiceContext(_serviceProxy)
Dim query_endswith1 = From c In svcContext.ContactSet _
Where c.LastName.EndsWith("cox") _
Select New With {Key c.FirstName,
Key c.LastName}
For Each c In query_endswith1
Console.WriteLine(c.FirstName.ToString() & " " _
& c.LastName.ToString())
Next c
End Using
And および Or 演算子の使用
次のサンプルは、Address1_City が "Redmond" または "Bellevue" で、かつ CreditLimit が $200 より大きい取引先担当者を取得する方法を示します。
using (ServiceContext svcContext = new ServiceContext(_serviceProxy))
{
var query_andor1 = from c in svcContext.ContactSet
where ((c.Address1_City == "Redmond" ||
c.Address1_City == "Bellevue") &&
(c.CreditLimit.Value != null &&
c.CreditLimit.Value >= 200))
select c;
foreach (var c in query_andor1)
{
System.Console.WriteLine(c.LastName + ", " + c.FirstName + " " +
c.Address1_City + " " + c.CreditLimit.Value);
}
}
Using svcContext As New ServiceContext(_serviceProxy)
Dim query_andor1 = From c In svcContext.ContactSet _
Where c.Address1_City.Equals("Redmond") _
OrElse c.Address1_City.Equals("Bellevue") _
AndAlso c.CreditLimit.Value >= 200 _
Select New With {Key c.FirstName,
Key c.LastName,
Key c.CreditLimit,
Key c.Address1_City}
For Each c In query_andor1
Console.WriteLine(c.LastName.ToString() & ", " _
& c.FirstName.ToString() & " " _
& c.Address1_City.ToString() & " " _
& c.CreditLimit.Value.ToString())
Next c
End Using
OrderBy 演算子の使用
次のサンプルは、CreditLimit の降順で並べ替えた取引先担当者を取得する方法を示します。
using (ServiceContext svcContext = new ServiceContext(_serviceProxy))
{
var query_orderby1 = from c in svcContext.ContactSet
where !c.CreditLimit.Equals(null)
orderby c.CreditLimit descending
select new
{
limit = c.CreditLimit,
first = c.FirstName,
last = c.LastName
};
foreach (var c in query_orderby1)
{
System.Console.WriteLine(c.limit.Value + " " +
c.last + ", " + c.first);
}
}
Using svcContext As New ServiceContext(_serviceProxy)
Dim query_orderby1 = From c In svcContext.ContactSet _
Where (Not c.CreditLimit.Equals(Nothing)) _
Order By c.CreditLimit Descending _
Select New With {Key .limit = c.CreditLimit,
Key .first = c.FirstName,
Key .last = c.LastName}
For Each c In query_orderby1
Console.WriteLine(c.limit.Value & " " & c.last & ", " _
& c.first)
Next c
End Using
次のサンプルは、LastName を降順で、FirstName を昇順で並べ替えた取引先担当者を取得する方法を示します。
using (ServiceContext svcContext = new ServiceContext(_serviceProxy))
{
var query_orderby2 = from c in svcContext.ContactSet
orderby c.LastName descending,
c.FirstName ascending
select new
{
first = c.FirstName,
last = c.LastName
};
foreach (var c in query_orderby2)
{
System.Console.WriteLine(c.last + ", " + c.first);
}
}
Using svcContext As New ServiceContext(_serviceProxy)
Dim query_orderby2 = From c In svcContext.ContactSet _
Order By c.LastName Descending, _
c.FirstName Ascending _
Select New With {Key .first = c.FirstName,
Key .last = c.LastName}
For Each c In query_orderby2
Console.WriteLine(c.last & ", " & c.first)
Next c
End Using
First および Single 演算子の使用
次のサンプルは、返される最初の取引先担当者レコードだけを取得する方法、および条件に一致する取引先担当者レコードを 1 つだけ取得する方法を示します。
using (ServiceContext svcContext = new ServiceContext(_serviceProxy))
{
Contact firstcontact = svcContext.ContactSet.First();
Contact singlecontact = svcContext.ContactSet.Single(c => c.ContactId == _contactId1);
System.Console.WriteLine(firstcontact.LastName + ", " +
firstcontact.FirstName + " is the first contact");
System.Console.WriteLine("==========================");
System.Console.WriteLine(singlecontact.LastName + ", " +
singlecontact.FirstName + " is the single contact");
}
Using svcContext As New ServiceContext(_serviceProxy)
Dim firstcontact As Contact = svcContext.ContactSet _
.First()
Console.WriteLine(firstcontact.LastName & ", " _
& firstcontact.FirstName _
& " is the first contact")
Console.WriteLine("==========================")
Dim singlecontact As Contact =
svcContext.ContactSet _
.Single(Function(c) c.ContactId.Value.Equals(_contactId1))
Console.WriteLine(singlecontact.LastName & ", " _
& singlecontact.FirstName _
& " is the single contact")
End Using
書式設定された値の取得
次のサンプルは、optionset オプションのラベル (この場合は現在のレコード ステータスの値) を取得する方法を示します。
using (ServiceContext svcContext = new ServiceContext(_serviceProxy))
{
var list_retrieve1 = from c in svcContext.ContactSet
where c.ContactId == _contactId1
select new { StatusReason = c.FormattedValues["statuscode"] };
foreach (var c in list_retrieve1)
{
System.Console.WriteLine("Status: " + c.StatusReason);
}
}
Using svcContext As New ServiceContext(_serviceProxy)
Dim list_retrieve1 = From c In svcContext.ContactSet _
Where c.ContactId.Value.Equals(_contactId1) _
Select New With
{Key .StatusReason =
c.FormattedValues("statuscode")}
For Each c In list_retrieve1
Console.WriteLine("Status: " & c.StatusReason)
Next c
End Using
Skip および Take 演算子の使用 (ページングなし)
次のサンプルは、Skip および Take 演算子を使用して、LastName が "Parker" ではないレコードを 2 つスキップした後で 2 レコードだけ取得する方法を示します。
using (ServiceContext svcContext = new ServiceContext(_serviceProxy))
{
var query_skip = (from c in svcContext.ContactSet
where c.LastName != "Parker"
orderby c.FirstName
select new
{
last = c.LastName,
first = c.FirstName
}).Skip(2).Take(2);
foreach (var c in query_skip)
{
System.Console.WriteLine(c.first + " " + c.last);
}
}
Using svcContext As New ServiceContext(_serviceProxy)
Dim query_skip = ( _
From c In svcContext.ContactSet _
Where c.LastName IsNot "Parker" _
Order By c.FirstName _
Select New With {Key .last = c.LastName,
Key .first = c.FirstName}).Skip(2).Take(2)
For Each c In query_skip
Console.WriteLine(c.first & " " & c.last)
Next c
End Using
FirstOrDefault および SingleOrDefault 演算子の使用
FirstOrDefault 演算子は、シーケンスの最初の要素を返し、要素が見つからない場合は既定値を返します。SingleOrDefault 演算子は、シーケンスの特定の要素を 1 つだけ返し、その要素が見つからない場合は既定値を返します。 次のサンプルは、これらの演算子の使用方法を示します。
using (ServiceContext svcContext = new ServiceContext(_serviceProxy))
{
Contact firstorcontact = svcContext.ContactSet.FirstOrDefault();
Contact singleorcontact = svcContext.ContactSet
.SingleOrDefault(c => c.ContactId == _contactId1);
System.Console.WriteLine(firstorcontact.FullName +
" is the first contact");
System.Console.WriteLine("==========================");
System.Console.WriteLine(singleorcontact.FullName +
" is the single contact");
}
Using svcContext As New ServiceContext(_serviceProxy)
Dim firstorcontact As Contact =
svcContext.ContactSet.FirstOrDefault()
Console.WriteLine(firstorcontact.FullName & " is the first contact")
Console.WriteLine("==========================")
Dim singleorcontact As Contact =
svcContext.ContactSet _
.SingleOrDefault(Function(c) c.ContactId.Value.Equals(_contactId1))
Console.WriteLine(singleorcontact.FullName & " is the single contact")
End Using
リンクされたエンティティの条件に基づく自己結合の使用
次のサンプルは、一方の取引先企業が他方の取引先企業の親会社である 2 つの取引先企業の名前を取得する方法を示します。
using (ServiceContext svcContext = new ServiceContext(_serviceProxy))
{
var query_joincond = from a1 in svcContext.AccountSet
join a2 in svcContext.AccountSet
on a1.ParentAccountId.Id equals a2.AccountId
where a2.AccountId == _accountId1
select new { Account = a1, Parent = a2 };
foreach (var a in query_joincond)
{
System.Console.WriteLine(a.Account.Name + " " + a.Parent.Name);
}
}
Using svcContext As New ServiceContext(_serviceProxy)
Dim query_joincond = From a1 In svcContext.AccountSet _
Join a2 In svcContext.AccountSet _
On a1.ParentAccountId.Id Equals a2.AccountId _
Where a2.AccountId.Value.Equals(_accountId1) _
Select New With {Key .Account = a1,
Key .Parent = a2}
For Each a In query_joincond
Console.WriteLine(a.Account.Name & " " & a.Parent.Name)
Next a
End Using
Where 句での変換の使用
次のサンプルは、記念日の日付が 2010 年 1 月 1 日より後である特定の取引先担当者を取得する方法を示します。
using (ServiceContext svcContext = new ServiceContext(_serviceProxy))
{
var query_wheretrans = from c in svcContext.ContactSet
where c.ContactId == _contactId1 &&
c.Anniversary > DateTime.Parse("1/1/2010")
select new
{
c.FirstName,
c.LastName
};
foreach (var c in query_wheretrans)
{
System.Console.WriteLine(c.FirstName + " " + c.LastName);
}
}
Using svcContext As New ServiceContext(_serviceProxy)
Dim query_wheretrans = From c In svcContext.ContactSet _
Where c.ContactId.Value.Equals(_contactId1) _
AndAlso c.Anniversary > Date.Parse("1/1/2010") _
Select New With {Key c.FirstName,
Key c.LastName}
For Each c In query_wheretrans
Console.WriteLine(c.FirstName & " " & c.LastName)
Next c
End Using
ページングの並べ替えの使用
次のサンプルは、追加条件を使用して複数の列を並べ替える方法を示します。
using (ServiceContext svcContext = new ServiceContext(_serviceProxy))
{
var query_pagingsort1 = (from c in svcContext.ContactSet
where c.LastName != "Parker"
orderby c.LastName ascending,
c.FirstName descending
select new { c.FirstName, c.LastName })
.Skip(2).Take(2);
foreach (var c in query_pagingsort1)
{
System.Console.WriteLine(c.FirstName + " " + c.LastName);
}
}
Using svcContext As New ServiceContext(_serviceProxy)
Dim query_pagingsort1 = ( _
From c In svcContext.ContactSet _
Where c.LastName IsNot "Parker" _
Order By c.LastName Ascending, c.FirstName Descending _
Select New With {Key c.FirstName,
Key c.LastName}).Skip(2).Take(2)
For Each c In query_pagingsort1
Console.WriteLine(c.FirstName & " " & c.LastName)
Next c
End Using
次のサンプルは、並べ替えに使用する列が取得する列とは異なる場合のページングの並べ替えを示します。
using (ServiceContext svcContext = new ServiceContext(_serviceProxy))
{
var query_pagingsort2 = (from c in svcContext.ContactSet
where c.LastName != "Parker"
orderby c.FirstName descending
select new { c.FirstName }).Skip(2).Take(2);
foreach (var c in query_pagingsort2)
{
System.Console.WriteLine(c.FirstName);
}
}
Using svcContext As New ServiceContext(_serviceProxy)
Dim query_pagingsort2 = ( _
From c In svcContext.ContactSet _
Where c.LastName IsNot "Parker" _
Order By c.FirstName Descending _
Select New With {Key c.FirstName}).Skip(2).Take(2)
For Each c In query_pagingsort2
Console.WriteLine(c.FirstName)
Next c
End Using
次のサンプルは、最初の 10 件のレコードを取得する方法を示します。
using (ServiceContext svcContext = new ServiceContext(_serviceProxy))
{
var query_pagingsort3 = (from c in svcContext.ContactSet
where c.LastName.StartsWith("W")
orderby c.MiddleName ascending,
c.FirstName descending
select new
{
c.FirstName,
c.MiddleName,
c.LastName
}).Take(10);
foreach (var c in query_pagingsort3)
{
System.Console.WriteLine(c.FirstName + " " +
c.MiddleName + " " + c.LastName);
}
}
Using svcContext As New ServiceContext(_serviceProxy)
Dim query_pagingsort3 = ( _
From c In svcContext.ContactSet _
Where c.LastName.StartsWith("W") _
Order By c.MiddleName Ascending, c.FirstName Descending _
Select New With {Key c.FirstName,
Key c.MiddleName,
Key c.LastName}).Take(10)
For Each c In query_pagingsort3
Console.WriteLine(c.FirstName & " " & c.MiddleName & " " & c.LastName)
Next c
End Using
関連するエンティティ列の取得 (一対多の関係の場合)
次のサンプルは、関連する取引先企業と取引先担当者のレコードから列を取得する方法を示します。
using (ServiceContext svcContext = new ServiceContext(_serviceProxy))
{
var query_retrieve1 = from c in svcContext.ContactSet
join a in svcContext.AccountSet
on c.ContactId equals a.PrimaryContactId.Id
where c.ContactId != _contactId1
select new { Contact = c, Account = a };
foreach (var c in query_retrieve1)
{
System.Console.WriteLine("Acct: " + c.Account.Name +
"\t\t" + "Contact: " + c.Contact.FullName);
}
}
Using svcContext As New ServiceContext(_serviceProxy)
Dim query_retrieve1 = From c In svcContext.ContactSet _
Join a In svcContext.AccountSet _
On c.ContactId Equals a.PrimaryContactId.Id _
Where Not c.ContactId.Value.Equals(_contactId1) _
Select New With {Key .Contact = c,
Key .Account = a}
For Each c In query_retrieve1
Console.WriteLine("Acct: " & c.Account.Name & vbTab & vbTab _
& "Contact: " & c.Contact.FullName)
Next c
End Using
.value による属性値の取得
次のサンプルは、属性の値にアクセスするための値の使用方法を示します。
using (ServiceContext svcContext = new ServiceContext(_serviceProxy))
{
var query_value = from c in svcContext.ContactSet
where c.ContactId != _contactId2
select new
{
ContactId = c.ContactId != null ?
c.ContactId.Value : Guid.Empty,
NumberOfChildren = c.NumberOfChildren != null ?
c.NumberOfChildren.Value : default(int),
CreditOnHold = c.CreditOnHold != null ?
c.CreditOnHold.Value : default(bool),
Anniversary = c.Anniversary != null ?
c.Anniversary.Value : default(DateTime)
};
foreach (var c in query_value)
{
System.Console.WriteLine(c.ContactId + " " + c.NumberOfChildren +
" " + c.CreditOnHold + " " + c.Anniversary);
}
}
Using svcContext As New ServiceContext(_serviceProxy)
Dim query_value = From c In svcContext.ContactSet _
Where Not c.ContactId.Value.Equals(_contactId2) _
Select New With
{Key .ContactId = If(
c.ContactId IsNot Nothing,
c.ContactId.Value,
Guid.Empty),
Key .NumberOfChildren = If(
c.NumberOfChildren IsNot Nothing,
c.NumberOfChildren.Value, Nothing),
Key .CreditOnHold = If(
c.CreditOnHold IsNot Nothing,
c.CreditOnHold.Value,
Nothing),
Key .Anniversary = If(
c.Anniversary IsNot Nothing,
c.Anniversary.Value,
Nothing)}
For Each c In query_value
Console.WriteLine(c.ContactId.ToString() & " " _
& c.NumberOfChildren & " " _
& c.CreditOnHold & " " & c.Anniversary)
Next c
End Using
複数のプロジェクション (新しいデータ型を別の型にキャスト)
次のサンプルは、複数のプロジェクションおよび値を異なるデータ型にキャストする方法を示します。
using (ServiceContext svcContext = new ServiceContext(_serviceProxy))
{
var query_projections = from c in svcContext.ContactSet
where c.ContactId == _contactId1
&& c.NumberOfChildren != null &&
c.Anniversary.Value != null
select new
{
Contact = new Contact {
LastName = c.LastName,
NumberOfChildren = c.NumberOfChildren
},
NumberOfChildren = (double)c.NumberOfChildren,
Anniversary = c.Anniversary.Value.AddYears(1),
};
foreach (var c in query_projections)
{
System.Console.WriteLine(c.Contact.LastName + " " +
c.NumberOfChildren + " " + c.Anniversary);
}
}
Using svcContext As New ServiceContext(_serviceProxy)
Dim query_projections = From c In svcContext.ContactSet _
Where c.ContactId.Value.Equals(_contactId1) _
And Not c.NumberOfChildren.Equals(Nothing) _
And Not c.Anniversary.Equals(Nothing) _
Select New With
{Key .Contact =
New Contact With
{.LastName = c.LastName,
.NumberOfChildren = c.NumberOfChildren},
Key .NumberOfChildren = CDbl(c.NumberOfChildren),
Key .Anniversary = c.Anniversary.Value.AddYears(1)}
For Each c In query_projections
Console.WriteLine(c.Contact.LastName & " " & c.NumberOfChildren _
& " " & c.Anniversary)
Next c
End Using
GetAttributeValue メソッドの使用
次のサンプルは、GetAttributeValue<T> メソッドの使用方法を示します。
using (ServiceContext svcContext = new ServiceContext(_serviceProxy))
{
var query_getattrib = from c in svcContext.ContactSet
where c.GetAttributeValue<Guid>("contactid") != _contactId1
select new
{
ContactId = c.GetAttributeValue<Guid?>("contactid"),
NumberOfChildren = c.GetAttributeValue<int?>("numberofchildren"),
CreditOnHold = c.GetAttributeValue<bool?>("creditonhold"),
Anniversary = c.GetAttributeValue<DateTime?>("anniversary"),
};
foreach (var c in query_getattrib)
{
System.Console.WriteLine(c.ContactId + " " + c.NumberOfChildren +
" " + c.CreditOnHold + " " + c.Anniversary);
}
}
Using svcContext As New ServiceContext(_serviceProxy)
Dim query_getattrib = From c In svcContext.ContactSet _
Where Not c.GetAttributeValue(Of Guid)("contactid").Equals( _
_contactId1) _
Select New With
{Key .ContactId =
c.GetAttributeValue(Of Guid?)("contactid"),
Key .NumberOfChildren =
c.GetAttributeValue(Of Integer?)("numberofchildren"),
Key .CreditOnHold =
c.GetAttributeValue(Of Boolean?)("creditonhold"),
Key .Anniversary =
c.GetAttributeValue(Of Date?)("anniversary")}
For Each c In query_getattrib
Console.WriteLine(c.ContactId.ToString() & " " _
& c.NumberOfChildren & " " & c.CreditOnHold _
& " " & c.Anniversary)
Next c
End Using
Math メソッドの使用
次のサンプルは、各種 Math メソッドの使用方法を示します。
using (ServiceContext svcContext = new ServiceContext(_serviceProxy))
{
var query_math = from c in svcContext.ContactSet
where c.ContactId != _contactId2
&& c.Address1_Latitude != null &&
c.Address1_Longitude != null
select new
{
Round = Math.Round(c.Address1_Latitude.Value),
Floor = Math.Floor(c.Address1_Latitude.Value),
Ceiling = Math.Ceiling(c.Address1_Latitude.Value),
Abs = Math.Abs(c.Address1_Latitude.Value),
};
foreach (var c in query_math)
{
System.Console.WriteLine(c.Round + " " + c.Floor +
" " + c.Ceiling + " " + c.Abs);
}
}
Using svcContext As New ServiceContext(_serviceProxy)
Dim query_math = From c In svcContext.ContactSet _
Where Not c.ContactId.Value.Equals(_contactId2) _
AndAlso c.Address1_Latitude IsNot Nothing _
AndAlso c.Address1_Longitude IsNot Nothing _
Select New With
{Key .Round =
Math.Round(c.Address1_Latitude.Value),
Key .Floor =
Math.Floor(c.Address1_Latitude.Value),
Key .Ceiling =
Math.Ceiling(c.Address1_Latitude.Value),
Key .Abs =
Math.Abs(c.Address1_Latitude.Value)}
For Each c In query_math
Console.WriteLine(c.Round & " " & c.Floor & " " _
& c.Ceiling & " " & c.Abs)
Next c
End Using
複数の Select 句と Where 句の使用
次のサンプルは、メソッド ベースのクエリ構文を使用する複数の Select 句と Where 句を示します。
using (ServiceContext svcContext = new ServiceContext(_serviceProxy))
{
var query_multiselect = svcContext.IncidentSet
.Where(i => i.IncidentId != _incidentId1)
.Select(i => i.incident_customer_accounts)
.Where(a => a.AccountId != _accountId2)
.Select(a => a.account_primary_contact)
.OrderBy(c => c.FirstName)
.Select(c => c.ContactId);
foreach (var c in query_multiselect)
{
System.Console.WriteLine(c.GetValueOrDefault());
}
}
Using svcContext As New ServiceContext(_serviceProxy)
Dim query_multiselect =
svcContext.IncidentSet _
.Where(Function(i) Not i.IncidentId.Value.Equals(_incidentId1)) _
.Select(Function(i) i.incident_customer_accounts) _
.Where(Function(a) Not a.AccountId.Value.Equals(_accountId2)) _
.Select(Function(a) a.account_primary_contact) _
.OrderBy(Function(c) c.FirstName).Select(Function(c) c.ContactId)
For Each c In query_multiselect
Console.WriteLine(c.GetValueOrDefault())
Next c
End Using
SelectMany の使用
次のサンプルは、SelectMany メソッドの使用方法を示します。
using (ServiceContext svcContext = new ServiceContext(_serviceProxy))
{
var query_selectmany = svcContext.ContactSet
.Where(c => c.ContactId != _contactId2)
.SelectMany(c => c.account_primary_contact)
.OrderBy(a => a.Name);
foreach (var c in query_selectmany)
{
System.Console.WriteLine(c.AccountId + " " + c.Name);
}
}
Using svcContext As New ServiceContext(_serviceProxy)
Dim query_selectmany =
svcContext.ContactSet _
.Where(Function(c) Not c.ContactId.Value.Equals(_contactId2)) _
.SelectMany(Function(c) c.account_primary_contact) _
.OrderBy(Function(a) a.Name)
For Each c In query_selectmany
Console.WriteLine(c.AccountId.ToString() & " " & c.Name)
Next c
End Using
文字列操作の使用
次のサンプルは、各種文字列メソッドの使用方法を示します。
using (ServiceContext svcContext = new ServiceContext(_serviceProxy))
{
var query_string = from c in svcContext.ContactSet
where c.ContactId == _contactId2
select new
{
IndexOf = c.FirstName.IndexOf("contact"),
Insert = c.FirstName.Insert(1, "Insert"),
Remove = c.FirstName.Remove(1, 1),
Substring = c.FirstName.Substring(1, 1),
ToUpper = c.FirstName.ToUpper(),
ToLower = c.FirstName.ToLower(),
TrimStart = c.FirstName.TrimStart(),
TrimEnd = c.FirstName.TrimEnd(),
};
foreach (var c in query_string)
{
System.Console.WriteLine(c.IndexOf + "\n" + c.Insert + "\n" +
c.Remove + "\n" + c.Substring + "\n"
+ c.ToUpper + "\n" + c.ToLower +
"\n" + c.TrimStart + " " + c.TrimEnd);
}
}
Using svcContext As New ServiceContext(_serviceProxy)
Dim query_string = From c In svcContext.ContactSet _
Where c.ContactId.Value.Equals(_contactId2) _
Select New With
{Key .IndexOf = c.FirstName.IndexOf("contact"),
Key .Insert = c.FirstName.Insert(1, "Insert"),
Key .Remove = c.FirstName.Remove(1, 1),
Key .Substring = c.FirstName.Substring(1, 1),
Key .ToUpper = c.FirstName.ToUpper(),
Key .ToLower = c.FirstName.ToLower(),
Key .TrimStart = c.FirstName.TrimStart(),
Key .TrimEnd = c.FirstName.TrimEnd()}
For Each c In query_string
Console.WriteLine(c.IndexOf & vbLf & c.Insert & vbLf _
& c.Remove & vbLf & c.Substring & vbLf _
& c.ToUpper & vbLf & c.ToLower & vbLf _
& c.TrimStart & " " & c.TrimEnd)
Next c
End Using
2 つの Where 句の使用
次のサンプルは、2 つの Where 句の使用方法を示します。
using (ServiceContext svcContext = new ServiceContext(_serviceProxy))
{
var query_twowhere = from a in svcContext.AccountSet
join c in svcContext.ContactSet
on a.PrimaryContactId.Id equals c.ContactId
where c.LastName == "Smith" && c.CreditOnHold != null
where a.Name == "Contoso Ltd"
orderby a.Name
select a;
foreach (var c in query_twowhere)
{
System.Console.WriteLine(c.AccountId + " " + c.Name);
}
}
Using svcContext As New ServiceContext(_serviceProxy)
Dim query_twowhere = From a In svcContext.AccountSet _
Join c In svcContext.ContactSet _
On a.PrimaryContactId.Id Equals c.ContactId _
Where c.LastName.Equals("Smith") _
AndAlso c.CreditOnHold IsNot Nothing _
Where a.Name.Equals("Contoso Ltd") _
Order By a.Name _
Select a
For Each c In query_twowhere
Console.WriteLine(c.AccountId.ToString() & " " & c.Name)
Next c
End Using
関連するレコードを取得するために LoadProperty を使用します。
次のサンプルは関連レコードにアクセスする LoadProperty の方法を示します。
Contact benAndrews = svcContext.ContactSet.Where(c => c.FullName == "Ben Andrews").FirstOrDefault();
if (benAndrews != null)
{
//benAndrews.Contact_Tasks is null until LoadProperty is used.
svcContext.LoadProperty(benAndrews, "Contact_Tasks");
Task benAndrewsFirstTask = benAndrews.Contact_Tasks.FirstOrDefault();
if (benAndrewsFirstTask != null)
{
Console.WriteLine("Ben Andrews first task with Subject: '{0}' retrieved.", benAndrewsFirstTask.Subject);
}
}
関連項目
LINQ (.NET 統合言語クエリ) を使用してクエリを作成する
サンプル: LINQ クエリの作成
Microsoft Dynamics 365
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