How to Correctly Pass Parameters to Stored Procedures using DbContext.Database.SqlQuery?

Use DbContext.Database.SqlQueryto query stored procedures

In Entity Framework Code First CTP5, you can use the DbContext.Database.SqlQuery<T>(sql, params) method to execute a stored procedure. However, you may encounter problems when passing parameters to stored procedures that require precise parameter names.

To resolve this issue, you should provide a SqlParameter instance in the following format:

<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>

This ensures that the parameters correctly match their names in the stored procedure. By explicitly providing the parameter name, you can avoid the "Procedure or function 'my stored procedure name' requires parameter '@param1', but it was not provided" error.

This method allows you to dynamically query stored procedures in a strongly typed manner, making it easy to use Entity Framework to retrieve data from complex database operations.

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