The calling thread cannot access this object because a different thread owns it

📢 The Calling Thread Cannot Access This Object Because a Different Thread Owns It 😩

Hey there! 👋 Have you ever encountered the annoying "The calling thread cannot access this object because a different thread owns it" exception in your code? Don't worry, it's a common issue many developers face. In this blog post, I'll walk you through the problem and guide you on how to solve it. Let's dive in! 💪

✨ Understanding the Problem ✨

This exception usually occurs when you try to access an object from a different thread than the one that owns it. In your code snippet, the exception is thrown in the GetGridData method while setting the objUDMCountryStandards.Country property. Here's the specific code:

objUDMCountryStandards.Country = txtSearchCountry.Text.Trim() != string.Empty ? txtSearchCountry.Text : null;

🧐 Identifying the Cause 🧐

The GetGridData method is executed in a background thread using the BackgroundWorker component. However, accessing UI elements like txtSearchCountry.Text from a background thread is not allowed and results in the mentioned exception. This is because UI elements are typically owned by the main UI thread.

💡 Finding the Solution 💡

To fix this issue, you need to update the UI elements from the UI thread itself. In WPF, you can achieve this by using the Dispatcher class. Here's what you can do:

1. Modify the FillPageControls method to pass the txtSearchCountry.Text value as a parameter to the worker.RunWorkerAsync() method:

worker.RunWorkerAsync(txtSearchCountry.Text);

1. In the worker_DoWork method, retrieve the passed parameter and store it in a variable:

private void worker_DoWork(object sender, System.ComponentModel.DoWorkEventArgs e)
{
    string searchText = (string)e.Argument;
    GetGridData(searchText, null); // pass the searchText parameter as an argument
}

1. Update the GetGridData method to accept the searchText parameter and modify the line that throws the exception as shown below:

private void GetGridData(string searchText, int? pageIndex)
{
    // ...
    objUDMCountryStandards.Country = searchText?.Trim() ?? null;
    // ...
}

By using the Dispatcher, we pass the required value from the UI thread to the background thread, ensuring that thread ownership doesn't cause any issues.

🎉 Problem Solved! 🎉

You've successfully fixed the "The calling thread cannot access this object because a different thread owns it" exception. Now you can run your code without any issues and continue to enjoy developing your awesome application! 🚀

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