How to Resolve 'Incorrect syntax near '0'' Error When Using Entity Framework's Table-Valued Parameters?

Entity Framework: Resolving Table-Valued Parameter Issues in Stored Procedures

When using Entity Framework's ExecuteStoreQuery to call a stored procedure with a table-valued parameter, you might encounter the error "Incorrect syntax near '0'". This usually stems from incorrect parameter formatting.

The Solution:

Properly configuring your parameters is key. Here's how:

• Use SqlParameter Objects: Replace standard parameters with SqlParameter instances.
• Specify SqlDbType.Structured: Set the SqlDbType property of your table-valued parameter to Structured.
• Define TypeName: Crucially, set the TypeName property to match the user-defined table type (UDT) in your stored procedure (e.g., "dbo.udt_Warnings").

Implementing these changes should resolve the "Incorrect syntax near '0'" error.

Alternative: EntityFrameworkExtras NuGet Package

For simplified handling, consider the EntityFrameworkExtras NuGet package (available at https://www.php.cn/link/5bf30c6aad7adf06445803878d854044). This package streamlines table-valued parameter passing with ExecuteStoreQuery. See the GitHub repository for detailed examples.

Advanced Technique: ObjectContext Extension Method

For more robust parameter management, create an ObjectContext extension method like ExecuteStoredProcedure. This method allows direct parameter passing without manual command string formatting. Example (C#):

<code class="language-csharp">public static class ObjectContextExt
{
    public static void ExecuteStoredProcedure(this ObjectContext context, string storedProcName, params object[] parameters)
    {
        string command = $"EXEC {storedProcName} @caseid, @userid, @warnings"; //Use string interpolation for better readability
        context.ExecuteStoreCommand(command, parameters);
    }
}

//Example Usage
class Program
{
    static void Main(string[] args)
    {
        var entities = new NewBusinessEntities();
        // ... (DataTable creation and parameter setup as in original example) ...
        entities.ExecuteStoredProcedure("usp_RaiseWarnings_rs", userId, warnings, caseId);
    }
}</code>

Important Considerations:

• Parameter Order: Maintain the correct parameter order to match your stored procedure's definition.
• UDT Columns: Include all columns from your UDT, even those with default values. Omitting columns can lead to errors.

By following these guidelines, you can effectively handle table-valued parameters within your Entity Framework stored procedure calls.

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