指定的命名连接在配置中找不到，不打算与EntityClient提供程序一起使用，或者无效

Question

我是Entity Framework的新手。我在这里遇到了这个错误！[在此输入图像描述] [1]

[1]：http://i.stack.imgur.com/rZcvf.jpg我想以程序方式建立连接字符串

        SqlConnectionStringBuilder sqlBuilder =
        new SqlConnectionStringBuilder();

        sqlBuilder.DataSource = server;
        sqlBuilder.InitialCatalog = database;
        sqlBuilder.IntegratedSecurity = false;
        sqlBuilder.PersistSecurityInfo = true;
        sqlBuilder.UserID = "XXXX"
        sqlBuilder.Password = "XXXXX";

        string providerString = sqlBuilder.ToString();

        EntityConnectionStringBuilder ucEntities =
        new EntityConnectionStringBuilder(); 

        ucEntities.Provider = "System.Data.SqlClient";


        ucEntities.ProviderConnectionString = providerString;

        ucEntities.Metadata = @"res://*/";
        Console.WriteLine(ucEntities.ToString());

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

我的Soulution包含20多个项目，我在Sturtup项目中定义了.edmx，以及上面的代码。我必须以编程方式组织连接字符串'因为我们有许多服务器。 App.cfg中定义的连接字符串工作正常