How to Properly Call a SQL Server Stored Procedure in C#: Avoid Parameter Errors

Learn how to call a stored procedure in SQL Server from C- and avoid common parameter-related errors with this detailed guide.
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How to Properly Call a SQL Server Stored Procedure in C-: Avoid Parameter Errors

When working with SQL Server and C-, one common task is to call a stored procedure from your application. However, this process can sometimes lead to frustrating issues, especially when it comes to passing parameters correctly. This guide will walk you through the steps to successfully call a stored procedure in C- and address the issue of parameter handling.

The Problem: Parameter Not Supplied

You may find yourself encountering an exception message like this when executing a stored procedure:

[[See Video to Reveal this Text or Code Snippet]]

This error indicates that the SQL Server procedure you are trying to call expects a parameter that has not been provided in your code. In this particular case, the parameter in question is -dataSubmissionId.

Understanding the Code

Let's break down the relevant parts of your C- code for clarity.

The Generic Method

You have a generic method defined as follows:

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This method is responsible for executing the stored procedure and mapping the results to a list. The parameters you provide here are crucial for the procedure to run successfully.

Specific Method

You also defined a method for fetching data:

[[See Video to Reveal this Text or Code Snippet]]

In this method, the parameters array is initialized, but the Append method does not modify the original array; it creates a new array instead.

The Solution: Properly Prepare the Parameters

To resolve the issue of the parameter not being supplied, you will need to modify how you handle the parameter array. Here’s the correct way to set parameters for your stored procedure:

[[See Video to Reveal this Text or Code Snippet]]

Implementing the Correction

Instead of using Array.Empty and Append, initialize your parameters explicitly and ensure you are adding them correctly to the SqlCommand object.

Here's an updated version of your GetDataSubmissionEntries method:

[[See Video to Reveal this Text or Code Snippet]]

With this adjustment, you are now creating a list of parameters that includes the -dataSubmissionId, allowing your stored procedure to execute without error.

Conclusion

Calling a stored procedure from C- can lead to complications, especially regarding parameter passing. By understanding the importance of how to properly construct and pass parameters, you can avoid common issues that may arise.

Adopting a structured approach like this ensures that your stored procedures execute smoothly and return the expected results. Happy coding!