EF6-ExecuteSqlCommandAsync-获取返回参数(声明标量变量错误) [英] EF6 - ExecuteSqlCommandAsync - Get return parameter (declare scalar variable error)

问题描述

我有以下代码:

object[] parameters =
    {
        new SqlParameter("@val1", val1),
        new SqlParameter("@val2", val2),
        new SqlParameter
        {
            ParameterName = "@retVal",
            SqlDbType = SqlDbType.Int,
            Direction = ParameterDirection.ReturnValue,
            Value = -1
        }
    };

    await context.Database.ExecuteSqlCommandAsync("EXEC @retVal = Example_SP @val1, @val2", parameters);

我正在使用的SP很好，并且在SQL MS中返回了一个值.但是，当我使用EF执行它时，会告诉我必须声明标量变量@retVal".那不是我的SqlParameter做什么的吗?

The SP I'm using is fine and returns a value in SQL MS fine. But when I execute it using EF I am told I 'must declare the scalar variable @retVal'. Isn't that what my SqlParameter does??

正如某些人在其他地方建议的那样，我尝试从参数中删除"@"符号，但是据我所知，"@"符号是可选的，无论如何都没有区别.

I've tried removing the '@' sign form the parameters, as some have suggested elsewhere, but as I understand it the '@' sign is optional and makes no difference anyway.

如何使用ExecuteSqlCommandAsync从SP获取返回值而不会导致错误?

How do I get the return value from the SP without causing errors, using ExecuteSqlCommandAsync?

谢谢！

推荐答案

您需要使用ParameterDirection.Output而不是ParameterDirection.ReturnValue.

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