How to Correctly Use DbContext.Database.SqlQuery with Stored Procedure Parameters?

EF Code First CTP5: Using DbContext.Database.SqlQuery with stored procedure parameters(sql, params)

Question:

Developers face challenges in providing parameters when trying to use DbContext.Database.SqlQuery method with stored procedures. When using the SqlParameter object, a SqlException is thrown indicating that the parameter was not provided as expected.

Answer:

In order to successfully use the DbContext.Database.SqlQuery method with a stored procedure that requires parameters, the following approach should be used:

Solution:

Instead of passing the SqlParameter object directly as a parameter, modify the SQL query string to include parameter names starting with the "@" symbol. Then, create and assign SqlParameter instances for each required parameter and provide them as additional parameters.

Code example:

The following code snippet demonstrates correct usage:

<code class="language-c#">context.Database.SqlQuery<我的实体类型>(
    "mySpName @param1, @param2, @param3",
    new SqlParameter("param1", param1),
    new SqlParameter("param2", param2),
    new SqlParameter("param3", param3)
);</code>

This updated syntax should resolve the SqlException issue and allow you to use the DbContext.Database.SqlQuery method to retrieve the desired results from a stored procedure.

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