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我们正在尝试动态构建一个EntityConnection，以便不同的用户连接到在运行时确定的不同的数据库。为此，我们正在测试此处找到的代码：http: //msdn.microsoft.com/en-us/library/bb738533.aspx。我们在下面实现了这一点：

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

' 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 = False
sqlBuilder.UserID = "OurAppUserName"
sqlBuilder.Password = "OurPassword"

' 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 to the current directory.
entityBuilder.Metadata = "res://*/NotaModel.csdl|" & _
                         "res://*/NotaModel.ssdl|" & _
                         "res://*/NotaModel.msl"

Console.WriteLine(entityBuilder.ToString)

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

运行 conn.Open() 时会抛出错误：“无法加载指定的元数据资源。” 这似乎表明一个或多个“res://*...”引用是错误的。我已经确认该项目确实包含这些文件（在 bin/debug 文件夹下）。我们在这里缺少什么——有什么想法吗？

谢谢

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1 回答 1

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是的，res://部分是错误的。查看 Reflector（程序集内部）中的资源名称，而不是本地文件系统上的资源名称，以了解它们应该是什么。

于 2010-07-14T17:28:29.617 回答