DataTable.CaseSensitive Özellik

public:
 property bool CaseSensitive { bool get(); void set(bool value); };

public bool CaseSensitive { get; set; }

[System.Data.DataSysDescription("DataTableCaseSensitiveDescr")]
public bool CaseSensitive { get; set; }

member this.CaseSensitive : bool with get, set

[<System.Data.DataSysDescription("DataTableCaseSensitiveDescr")>]
member this.CaseSensitive : bool with get, set

Public Property CaseSensitive As Boolean

Özellik Değeri

true karşılaştırma büyük/küçük harfe duyarlıysa; aksi takdirde false. Varsayılan, üst DataSet nesnenin CaseSensitive özelliğine veya false öğesinden DataSetbağımsız olarak oluşturulduysa DataTable ayarlanır.

Öznitelikler

DataSysDescriptionAttribute

Örnekler

Aşağıdaki örnek, Select üzerinde DataTableyöntemini iki kez çağırır. özelliği ilk kez CaseSensitive olarak, ikincisinde trueolarak ayarlanırfalse.

private static void ToggleCaseSensitive()
{
    DataTable t;
    DataRow[] foundRows;

    t = CreateDataSet().Tables[0];

    t.CaseSensitive = false;
    foundRows = t.Select("item = 'abc'");

    // Print out DataRow values.
    PrintRowValues(foundRows, "CaseSensitive = False");

    t.CaseSensitive = true;
    foundRows = t.Select("item = 'abc'");

    PrintRowValues(foundRows, "CaseSensitive = True");
}

public static DataSet CreateDataSet()
{
    // Create a DataSet with one table, two columns
    DataSet ds = new DataSet();
    DataTable t = new DataTable("Items");

    // Add table to dataset
    ds.Tables.Add(t);

    // Add two columns
    DataColumn c;

    // First column
    c = t.Columns.Add("id", typeof(int));
    c.AutoIncrement = true;

    // Second column
    t.Columns.Add("item", typeof(string));

    // Set primary key
    t.PrimaryKey = new DataColumn[] { t.Columns["id"] };

    // Add twelve rows
    for (int i = 0; i < 10; i++)
    {
        t.Rows.Add(new object[] { i, i.ToString() });
    }
    t.Rows.Add(new object[] { 11, "abc" });
    t.Rows.Add(new object[] { 15, "ABC" });

    return ds;
}

private static void PrintRowValues(DataRow[] rows, string label)
{
    Console.WriteLine();
    Console.WriteLine(label);
    if (rows.Length <= 0)
    {
        Console.WriteLine("no rows found");
        return;
    }
    foreach (DataRow r in rows)
    {
        foreach (DataColumn c in r.Table.Columns)
        {
            Console.Write("\t {0}", r[c]);
        }
        Console.WriteLine();
    }
}

Private Sub ToggleCaseSensitive()
    Dim t As DataTable
    Dim foundRows() As DataRow

    t = CreateDataSet().Tables(0)

    t.CaseSensitive = False
    foundRows = t.Select("item = 'abc'")

    ' Print out DataRow values. Row 0 contains the value we're looking for.
    PrintRowValues(foundRows, "CaseSensitive = False")

    t.CaseSensitive = True
    foundRows = t.Select("item = 'abc'")

    PrintRowValues(foundRows, "CaseSensitive = True")
End Sub

Public Function CreateDataSet() As DataSet
    ' Create a DataSet with one table, two columns
    Dim ds As New DataSet
    Dim t As New DataTable("Items")

    ' Add table to DataSet
    ds.Tables.Add(t)

    ' Add two columns
    Dim c As DataColumn

    ' First column
    c = t.Columns.Add("id", Type.GetType("System.Int32"))
    c.AutoIncrement = True

    ' Second column
    t.Columns.Add("item", Type.GetType("System.String"))

    ' Set primary key
    t.PrimaryKey = New DataColumn() {t.Columns("id")}

    For i As Integer = 0 To 9
        t.Rows.Add(New Object() {i, i.ToString()})
    Next
    t.Rows.Add(New Object() {11, "abc"})
    t.Rows.Add(New Object() {15, "ABC"})

    CreateDataSet = ds
End Function

Private Sub PrintRowValues(ByRef rows As DataRow(), ByVal label As String)
    Console.WriteLine()
    Console.WriteLine(label)
    If rows.Length <= 0 Then
        Console.WriteLine("no rows found")
        Return
    End If

    For Each r As DataRow In rows
        For Each c As DataColumn In r.Table.Columns
            Console.Write(vbTab & " {0}", r(c))
        Next
        Console.WriteLine()
    Next
End Sub

Açıklamalar

CaseSensitive özelliği sıralama, arama ve filtrelemedeki dize karşılaştırmalarını etkiler.

Şunlara uygulanır

Ayrıca bkz.

• Select()
• DataTables