How to Correctly Use DbContext.Database.SqlQuery with Stored Procedures and Parameters in EF Code First?

Using DbContext.Database.SqlQuery(sql, params) method and stored procedure in EF Code First CTP5

Entity Framework Code First CTP5 introduces the DbContext.Database.SqlQuery<T>(sql, params) method, which provides a way to execute raw SQL queries against the database. However, when trying to use this method with a stored procedure that has parameters, developers may encounter an exception indicating that no parameters were provided.

Solution:

To successfully use DbContext.Database.SqlQuery<T>(sql, params) with a stored procedure that requires parameters, the parameters must be specified as SqlParameter objects. The correct syntax is:

<code class="language-csharp">context.Database.SqlQuery<我的实体类型>(
    "我的存储过程名称 @param1, @param2, @param3",
    new SqlParameter("param1", param1),
    new SqlParameter("param2", param2),
    new SqlParameter("param3", param3)
);</code>

In this example, "my stored procedure name" is the name of the stored procedure, and "param1", "param2", and "param3" are the values ​​to be passed to the corresponding parameters in the stored procedure. By specifying the parameters in this way, the SqlQuery method can correctly provide the value to the stored procedure for execution.

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