DataSet Класс

Определение

public ref class DataSet : System::ComponentModel::MarshalByValueComponent, System::ComponentModel::IListSource, System::ComponentModel::ISupportInitialize, System::ComponentModel::ISupportInitializeNotification, System::Runtime::Serialization::ISerializable, System::Xml::Serialization::IXmlSerializable

public ref class DataSet : System::ComponentModel::MarshalByValueComponent, System::ComponentModel::IListSource, System::ComponentModel::ISupportInitialize, System::Runtime::Serialization::ISerializable, System::Xml::Serialization::IXmlSerializable

public ref class DataSet : System::ComponentModel::MarshalByValueComponent, System::ComponentModel::IListSource, System::ComponentModel::ISupportInitializeNotification, System::Runtime::Serialization::ISerializable, System::Xml::Serialization::IXmlSerializable

public class DataSet : System.ComponentModel.MarshalByValueComponent, System.ComponentModel.IListSource, System.ComponentModel.ISupportInitialize, System.ComponentModel.ISupportInitializeNotification, System.Runtime.Serialization.ISerializable, System.Xml.Serialization.IXmlSerializable

[System.Serializable]
public class DataSet : System.ComponentModel.MarshalByValueComponent, System.ComponentModel.IListSource, System.ComponentModel.ISupportInitialize, System.Runtime.Serialization.ISerializable, System.Xml.Serialization.IXmlSerializable

[System.Serializable]
public class DataSet : System.ComponentModel.MarshalByValueComponent, System.ComponentModel.IListSource, System.ComponentModel.ISupportInitializeNotification, System.Runtime.Serialization.ISerializable, System.Xml.Serialization.IXmlSerializable

public class DataSet : System.ComponentModel.MarshalByValueComponent, System.ComponentModel.IListSource, System.ComponentModel.ISupportInitializeNotification, System.Runtime.Serialization.ISerializable, System.Xml.Serialization.IXmlSerializable

type DataSet = class
    inherit MarshalByValueComponent
    interface IListSource
    interface ISupportInitialize
    interface ISupportInitializeNotification
    interface ISerializable
    interface IXmlSerializable

[<System.Serializable>]
type DataSet = class
    inherit MarshalByValueComponent
    interface IListSource
    interface IXmlSerializable
    interface ISupportInitialize
    interface ISerializable

[<System.Serializable>]
type DataSet = class
    inherit MarshalByValueComponent
    interface IListSource
    interface IXmlSerializable
    interface ISupportInitializeNotification
    interface ISupportInitialize
    interface ISerializable

Public Class DataSet
Inherits MarshalByValueComponent
Implements IListSource, ISerializable, ISupportInitialize, ISupportInitializeNotification, IXmlSerializable

Public Class DataSet
Inherits MarshalByValueComponent
Implements IListSource, ISerializable, ISupportInitialize, IXmlSerializable

Public Class DataSet
Inherits MarshalByValueComponent
Implements IListSource, ISerializable, ISupportInitializeNotification, IXmlSerializable

Наследование

Object

MarshalByValueComponent

DataSet

Атрибуты

SerializableAttribute

Реализации

IListSource ISupportInitialize ISupportInitializeNotification ISerializable IXmlSerializable

Примеры

Следующий пример состоит из нескольких методов, которые в сочетании создают и заполняют DataSet из базы данных Northwind .

using System;
using System.Data;
using System.Data.SqlClient;

namespace Microsoft.AdoNet.DataSetDemo
{
    class NorthwindDataSet
    {
        static void Main()
        {
            string connectionString = GetConnectionString();
            ConnectToData(connectionString);
        }

        private static void ConnectToData(string connectionString)
        {
            //Create a SqlConnection to the Northwind database.
            using (SqlConnection connection =
                       new SqlConnection(connectionString))
            {
                //Create a SqlDataAdapter for the Suppliers table.
                SqlDataAdapter adapter = new SqlDataAdapter();

                // A table mapping names the DataTable.
                adapter.TableMappings.Add("Table", "Suppliers");

                // Open the connection.
                connection.Open();
                Console.WriteLine("The SqlConnection is open.");

                // Create a SqlCommand to retrieve Suppliers data.
                SqlCommand command = new SqlCommand(
                    "SELECT SupplierID, CompanyName FROM dbo.Suppliers;",
                    connection);
                command.CommandType = CommandType.Text;

                // Set the SqlDataAdapter's SelectCommand.
                adapter.SelectCommand = command;

                // Fill the DataSet.
                DataSet dataSet = new DataSet("Suppliers");
                adapter.Fill(dataSet);

                // Create a second Adapter and Command to get
                // the Products table, a child table of Suppliers.
                SqlDataAdapter productsAdapter = new SqlDataAdapter();
                productsAdapter.TableMappings.Add("Table", "Products");

                SqlCommand productsCommand = new SqlCommand(
                    "SELECT ProductID, SupplierID FROM dbo.Products;",
                    connection);
                productsAdapter.SelectCommand = productsCommand;

                // Fill the DataSet.
                productsAdapter.Fill(dataSet);

                // Close the connection.
                connection.Close();
                Console.WriteLine("The SqlConnection is closed.");

                // Create a DataRelation to link the two tables
                // based on the SupplierID.
                DataColumn parentColumn =
                    dataSet.Tables["Suppliers"].Columns["SupplierID"];
                DataColumn childColumn =
                    dataSet.Tables["Products"].Columns["SupplierID"];
                DataRelation relation =
                    new System.Data.DataRelation("SuppliersProducts",
                    parentColumn, childColumn);
                dataSet.Relations.Add(relation);
                Console.WriteLine(
                    "The {0} DataRelation has been created.",
                    relation.RelationName);
            }
        }

        static private string GetConnectionString()
        {
            // To avoid storing the connection string in your code,
            // you can retrieve it from a configuration file.
            return "Data Source=(local);Initial Catalog=Northwind;"
                + "Integrated Security=SSPI";
        }
    }
}

Option Explicit On
Option Strict On

Imports System.Data
Imports system.Data.SqlClient

Public Class NorthwindDataSet

    Public Shared Sub Main()
        Dim connectionString As String = _
            GetConnectionString()
        ConnectToData(connectionString)
    End Sub

    Private Shared Sub ConnectToData( _
        ByVal connectionString As String)

        ' Create a SqlConnection to the Northwind database.
        Using connection As SqlConnection = New SqlConnection( _
           connectionString)

            ' Create a SqlDataAdapter for the Suppliers table.
            Dim suppliersAdapter As SqlDataAdapter = _
               New SqlDataAdapter()

            ' A table mapping names the DataTable.
            suppliersAdapter.TableMappings.Add("Table", "Suppliers")

            ' Open the connection.
            connection.Open()
            Console.WriteLine("The SqlConnection is open.")

            ' Create a SqlCommand to retrieve Suppliers data.
            Dim suppliersCommand As New SqlCommand( _
               "SELECT SupplierID, CompanyName FROM dbo.Suppliers;", _
               connection)
            suppliersCommand.CommandType = CommandType.Text

            ' Set the SqlDataAdapter's SelectCommand.
            suppliersAdapter.SelectCommand = suppliersCommand

            ' Fill the DataSet.
            Dim dataSet As New DataSet("Suppliers")
            suppliersAdapter.Fill(dataSet)

            ' Create a second SqlDataAdapter and SqlCommand to get
            ' the Products table, a child table of Suppliers. 
            Dim productsAdapter As New SqlDataAdapter()
            productsAdapter.TableMappings.Add("Table", "Products")

            Dim productsCommand As New SqlCommand( _
               "SELECT ProductID, SupplierID FROM dbo.Products;", _
               connection)
            productsAdapter.SelectCommand = productsCommand

            ' Fill the DataSet.
            productsAdapter.Fill(dataSet)

            ' Close the connection.
            connection.Close()
            Console.WriteLine("The SqlConnection is closed.")

            ' Create a DataRelation to link the two tables
            ' based on the SupplierID.
            Dim parentColumn As DataColumn = _
               dataSet.Tables("Suppliers").Columns("SupplierID")
            Dim childColumn As DataColumn = _
               dataSet.Tables("Products").Columns("SupplierID")
            Dim relation As New DataRelation("SuppliersProducts", _
               parentColumn, childColumn)
            dataSet.Relations.Add(relation)

            Console.WriteLine( _
               "The {0} DataRelation has been created.", _
               relation.RelationName)
        End Using

    End Sub

    Private Shared Function GetConnectionString() As String
        ' To avoid storing the connection string in your code,  
        ' you can retrieve it from a configuration file.
        Return "Data Source=(local);Initial Catalog=Northwind;" _
           & "Integrated Security=SSPI;"
    End Function
End Class

Комментарии

Дополнительные сведения об этом API см. в разделе Дополнительные примечания API для DataSet.

Конструкторы

Свойства

Методы

События

Явные реализации интерфейса

Методы расширения

Применяется к

Потокобезопасность

Этот тип является безопасным для многопоточных операций чтения. Необходимо синхронизировать все операции записи.

См. также раздел

• Использование наборов данных в ADO.NET