EF4.1 代码优先:带有输出参数的存储过程 [英] EF4.1 Code First: Stored Procedure with output parameter

问题描述

我首先使用实体​​框架 4.1 代码.我想调用一个具有输出参数的存储过程，并检索该输出参数的值以及强类型结果集.它是一个带有这样签名的搜索功能

I use Entity Framework 4.1 Code First. I want to call a stored procedure that has an output parameter and retrieve the value of that output parameter in addition to the strongly typed result set. Its a search function with a signature like this

public IEnumerable<MyType> Search(int maxRows, out int totalRows, string searchTerm) { ... }

我发现了很多关于函数导入"的提示，但这与 Code First 不兼容.我可以使用 Database.SqlQuery(...) 调用存储过程，但这不适用于输出参数.

I found lots of hints to "Function Imports" but that is not compatible with Code First. I can call stored procedures using Database.SqlQuery(...) but that does not work with output parameters.

我可以使用 EF4.1 Code First 解决这个问题吗?

Can I solve that problem using EF4.1 Code First at all?

推荐答案

SqlQuery 使用输出参数，但您必须正确定义 SQL 查询和设置 SqlParameters.尝试类似:

SqlQuery works with output parameters but you must correctly define SQL query and setup SqlParameters. Try something like:

var outParam = new SqlParameter();
outParam.ParameterName = "TotalRows";
outParam.SqlDbType = SqlDbType.Int;
outParam.ParameterDirection = ParameterDirection.Output;

var data = dbContext.Database.SqlQuery<MyType>("sp_search @SearchTerm, @MaxRows, @TotalRows OUT", 
               new SqlParameter("SearchTerm", searchTerm), 
               new SqlParameter("MaxRows", maxRows),
               outParam);
var result = data.ToList();
totalRows = (int)outParam.Value;

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