.net - "PublicKeyToken <..> is not a valid extension type."错误？

Question

我向我的应用程序添加了一条 UPDATE 语句，该语句运行良好。它正确更新数据库，除了四个错误消息之外，我没有看到任何问题。这是什么意思？

Error   1   Type Microsoft.Data.Tools.Schema.Sql.Sql90DatabaseSchemaProvider, Microsoft.Data.Tools.Schema.Sql, Version=10.3.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a is not a valid extension type.        0   0   
Error   2   Type Microsoft.Data.Tools.Schema.Sql.Sql100DatabaseSchemaProvider, Microsoft.Data.Tools.Schema.Sql, Version=10.3.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a is not a valid extension type.       0   0        
Error   3   Type Microsoft.Data.Tools.Schema.Sql.Sql110DatabaseSchemaProvider, Microsoft.Data.Tools.Schema.Sql, Version=10.3.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a is not a valid extension type.       0   0   
Error   4   Type Microsoft.Data.Tools.Schema.Sql.SqlAzureDatabaseSchemaProvider, Microsoft.Data.Tools.Schema.Sql, Version=10.3.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a is not a valid extension type.     0   0

我的代码:

Using sqlCon = New SqlConnection("Data Source=(LocalDB)\v11.0;AttachDbFilename=|DataDirectory|\ITCSDatabase.mdf;Integrated Security=True")
    sqlCon.Open()
    Dim name As String = "Name"
    Dim link As String = "link"
    Dim dec As Integer = 0
    Dim sqlUpdate = "INSERT INTO appTable " & _
    "VALUES (41, @name, @link, 0, @dec, 0)"
    Dim updateCmd = New SqlCommand(sqlUpdate, sqlCon)
    updateCmd.Parameters.AddWithValue("@name", Name)
    updateCmd.Parameters.AddWithValue("@link", link)
    updateCmd.Parameters.AddWithValue("@dec", dec)
    updateCmd.ExecuteNonQuery()
    sqlCon.Close()
End Using

*注意:它是存储在用户计算机本地的本地数据库 (.mdf)。**局部变量； name、link 和 dec 仅用于测试。一旦工作正常，它们将被用户输入替换。

Answer 1

似乎是 known problem VisualStudio 2012。重新启动应该有助于删除这些消息。