How Can I Pass Table-Valued Parameters to Stored Procedures in Entity Framework?

Passing table-valued parameters to stored procedures in Entity Framework

Entity Framework itself does not natively support passing table-valued parameters directly to stored procedures. However, this can be achieved by using the ObjectContext command with ExecuteStoreQuery.

Create a universal warehousing method

First, define a general warehousing method:

<code class="language-csharp">public IEnumerable<T> ExecuteStoredProcedure<T>(string procedureName, params object[] parameters)
{
    // 构建命令字符串
    StringBuilder command = new StringBuilder();
    command.Append("EXEC ");
    command.Append(procedureName);
    command.Append(" ");

    // 添加参数占位符
    for (int i = 0; i < parameters.Length; i++)
    {
        if (i > 0)
            command.Append(",");

        command.Append("{" + i + "}");
    }

    // 执行查询
    return this.context.ExecuteStoreQuery<T>(command.ToString(), parameters);
}</code>

Use ExecuteStoreQuery with table-valued parameters

When using ExecuteStoreQuery with table-valued parameters, set the SqlParameter attribute of SqlDbType to Structured and the TypeName attribute to the name of the user-defined type:

<code class="language-csharp">var warnings = new SqlParameter("warnings", SqlDbType.Structured);
warnings.Value = dt;
warnings.TypeName = "dbo.udt_Warnings";</code>

Pass parameters to stored procedure

In the ExecuteStoredProcedure method, make sure the parameters are passed in the correct order:

<code class="language-csharp">entities.ExecuteStoredProcedure("usp_RaiseWarnings_rs", userId, warnings, caseId);</code>

DbContext and ObjectContext

For Entity Framework Code First, DbContext needs to be converted to ObjectContext to use the ExecuteStoreQuery method:

<code class="language-csharp">var entities = (ObjectContext)context;
entities.ExecuteStoredProcedure("usp_RaiseWarnings_rs", userId, warnings, caseId);</code>

Additional Notes

• Every column in the user-defined table must be passed, even if they have default values.
• The parameters passed to ExecuteStoreCommand must be in the same order as in the stored procedure.

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