Procédure : Créer une chaîne de connexion EntityConnection

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Cette rubrique fournit un exemple de génération d'un objet EntityConnection.

Pour exécuter le code de cet exemple

  1. Ajoutez le modèle de vente AdventureWorks Sales Model à votre projet et configurez ce dernier de façon à utiliser Entity Framework. Pour plus d’informations, consultez Comment : Utiliser l’Assistant Entity Data Model.

  2. Dans la page de codes de votre application, ajoutez les instructions using (Imports en Visual Basic) suivantes :

    using System;
using System.Collections.Generic;
using System.Collections;
using System.Data.Common;
using System.Data;
using System.IO;
using System.Data.SqlClient;
using System.Data.EntityClient;
using System.Data.Metadata.Edm;

    Imports System.Collections.Generic
Imports System.Collections
Imports System.Data.Common
Imports System.Data
Imports System.IO
Imports System.Data.SqlClient
Imports System.Data.EntityClient
Imports System.Data.Metadata.Edm

Exemple

L'exemple ci-dessous initialise l'objet System.Data.SqlClient.SqlConnectionStringBuilder pour le fournisseur sous-jacent, puis initialise l'objet System.Data.EntityClient.EntityConnectionStringBuilder avant de le passer au constructeur de l'objet EntityConnection.


// Specify the provider name, server and database.
string providerName = "System.Data.SqlClient";
string serverName = ".";
string databaseName = "AdventureWorks";

// Initialize the connection string builder for the
// underlying provider.
SqlConnectionStringBuilder sqlBuilder =
    new SqlConnectionStringBuilder();

// Set the properties for the data source.
sqlBuilder.DataSource = serverName;
sqlBuilder.InitialCatalog = databaseName;
sqlBuilder.IntegratedSecurity = true;

// Build the SqlConnection connection string.
string providerString = sqlBuilder.ToString();

// Initialize the EntityConnectionStringBuilder.
EntityConnectionStringBuilder entityBuilder =
    new EntityConnectionStringBuilder();

//Set the provider name.
entityBuilder.Provider = providerName;

// Set the provider-specific connection string.
entityBuilder.ProviderConnectionString = providerString;

// Set the Metadata location.
entityBuilder.Metadata = @"res://*/AdventureWorksModel.csdl|
                            res://*/AdventureWorksModel.ssdl|
                            res://*/AdventureWorksModel.msl";
Console.WriteLine(entityBuilder.ToString());

using (EntityConnection conn =
    new EntityConnection(entityBuilder.ToString()))
{
    conn.Open();
    Console.WriteLine("Just testing the connection.");
    conn.Close();
}


' Specify the provider name, server and database. 
Dim providerName As String = "System.Data.SqlClient"
Dim serverName As String = "."
Dim databaseName As String = "AdventureWorks"

' Initialize the connection string builder for the 
' underlying provider. 
Dim sqlBuilder As New SqlConnectionStringBuilder()

' Set the properties for the data source. 
sqlBuilder.DataSource = serverName
sqlBuilder.InitialCatalog = databaseName
sqlBuilder.IntegratedSecurity = True

' Build the SqlConnection connection string. 
Dim providerString As String = sqlBuilder.ToString()

' Initialize the EntityConnectionStringBuilder. 
Dim entityBuilder As New EntityConnectionStringBuilder()

'Set the provider name. 
entityBuilder.Provider = providerName

' Set the provider-specific connection string. 
entityBuilder.ProviderConnectionString = providerString

' Set the Metadata location. 
entityBuilder.Metadata = "res://*/AdventureWorksModel.csdl|res://*/AdventureWorksModel.ssdl|res://*/AdventureWorksModel.msl"
Console.WriteLine(entityBuilder.ToString())

Using conn As New EntityConnection(entityBuilder.ToString())
    conn.Open()
    Console.WriteLine("Just testing the connection.")
    conn.Close()
End Using

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