How to Implement Entity Framework's Stored Procedure Table Value Parameters?

Entity Framework stored procedure table-valued parameter implementation method

While Entity Framework does not directly support passing table-valued parameters, a workaround can be implemented using the ObjectContext command. ExecuteStoreQuery

Customized EF warehousing method

The following generic EF warehousing methods allow you to execute stored procedures that include table-valued parameters:

public IEnumerable<T> ExecuteStoredProcedure<T>(string procedureName, params object[] parameters)
{
    StringBuilder command = new StringBuilder();
    command.Append("EXEC ");
    command.Append(procedureName);
    command.Append(" ");

    // 为每个参数添加占位符
    for (int i = 0; i < parameters.Length; i++)
    {
        if (i > 0)
            command.Append(",");

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

    return this.context.ExecuteStoreQuery<T>(command.ToString(), parameters);
}

Custom table-valued parameters

As mentioned in the problem description, table-valued parameters require specific configuration:

The

parameter must be of type
• . SqlParameter
• must be set to SqlDbType. Structured
• must be set to the name of the user-defined type. TypeName

ExecuteStoreQuery using table-valued parameters

The following code demonstrates how to use

to pass table-valued parameters: ExecuteStoreQuery

dt.Rows.Add("EO01", 9, 4, 0);
dt.Rows.Add("EO00", 9, 4, 0);
dt.Rows.Add("EO02", 9, 4, 0);

var warnings = new SqlParameter("warnings", SqlDbType.Structured);
warnings.Value = dt;
warnings.TypeName = "dbo.udt_Warnings";

entities.ExecuteStoredProcedure("usp_RaiseWarnings_rs", userId, warnings, caseId);

ObjectContext’s stored procedure execution extension method

Alternatively, you can create an extension method for

: ObjectContext

public static void ExecuteStoredProcedure(this ObjectContext context, string storedProcName, params object[] parameters)
{
    string command = "EXEC " + storedProcName + " @caseid, @userid, @warnings";

    context.ExecuteStoreCommand(command, parameters);
}

This method allows you to directly use

to execute a stored procedure that contains table-valued parameters. ObjectContext

Code First Compatibility

If using Entity Framework Code First, you can access the

method by converting DbContext to ObjectContext. However, a library called EntityFrameworkExtras provides a more convenient way to handle table-valued parameters in a Code First environment. ExecuteStoreQuery

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