entity-framework - EF代码第一个: The EntitySet name 'TestDBContext1.Customers' could not be found

Question

我收到此错误

Additional information: The EntitySet name 'TestDBContext1.Customers' could not be found.

我正在尝试调用返回多个结果集的 SQL Server 存储过程。

这是我的完整代码:

private void button4_Click(object sender, EventArgs e)
{
    using (var db = new TestDBContext1())
    {
        db.Database.Initialize(force: false);

        // Create a SQL command to execute the stored procedure 
        var cmd = db.Database.Connection.CreateCommand();
        cmd.CommandText = "[dbo].[MultiResultSet]";

        try
        {
            db.Database.Connection.Open();

            // Run the stored procedure 
            var reader = cmd.ExecuteReader();

            // Read Blogs from the first result set 
            var customers = ((IObjectContextAdapter)db)
                        .ObjectContext
                        .Translate<Customer>(reader, "Customers", MergeOption.AppendOnly);

            foreach (var item in customers)
            {
                Console.WriteLine(item.FirstName);
            }

            // Move to second result set and read Posts 
            reader.NextResult();

            var Addresses = ((IObjectContextAdapter) db)
                        .ObjectContext
                        .Translate<Addresses>(reader, "Addresses", MergeOption.AppendOnly);

            foreach (var item in Addresses)
            {
                Console.WriteLine(item.Address1);
            }
        }
        finally
        {
            db.Database.Connection.Close();
        }
    }
}

此行引发上述错误:

var customers = ((IObjectContextAdapter)db)
.ObjectContext
.Translate<Customer>(reader, "Customers", MergeOption.AppendOnly);

我的数据库表是客户和地址。为什么我会收到此错误？我的代码需要更改什么？

有趣的是，当我按照下面的方式编码时，一切都会正常工作。

var customers = ((IObjectContextAdapter)db)
.ObjectContext
.Translate<Customer>(reader);

当我从代码中删除 "Customers", MergeOption.AppendOnly 时，代码就可以正常工作了。只是不明白我上面的代码出了什么问题。请有人帮助我理解这一点。谢谢

Answer 1

如果你的集合没有名称，你可以直接写

var customers = ((IObjectContextAdapter)db).ObjectContext.Translate<Customer>(reader);

该 MergeOption 的默认值已经是 AppendOnly，因此您也不必担心该参数。