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How to Fix the 'The calling thread cannot access this object because a different thread owns it' Error in WPF?
How to Fix the 'The calling thread cannot access this object because a different thread owns it' Error in WPF?
Feb 01, 2025 pm 09:46 PM
Resolving the "Cross-thread operation not valid" Exception in UI Updates
The error "The calling thread cannot access this object because a different thread owns it" typically occurs when attempting to modify UI elements from a background thread. This is because UI elements are owned by the main thread. The problematic line in your code is:
objUDMCountryStandards.Country = txtSearchCountry.Text.Trim() != string.Empty ? txtSearchCountry.Text : null;
This code attempts to update objUDMCountryStandards.Country which likely interacts with the UI (e.g., updating a textbox) from a thread other than the main thread.
To fix this, you must marshal the UI update back to the main thread. Here are two common solutions:
Method 1: Using Dispatcher.Invoke
This method ensures that the code within the Invoke delegate runs on the main thread:
this.Dispatcher.Invoke(() =>
{
objUDMCountryStandards.Country = txtSearchCountry.Text.Trim() != string.Empty ? txtSearchCountry.Text : null;
});
Method 2: Using Dispatcher.CheckAccess
This approach first checks if the current thread has access to the UI. If it does, the update proceeds directly; otherwise, Dispatcher.Invoke is used:
private void GetGridData(object sender, int pageIndex)
{
Standards.UDMCountryStandards objUDMCountryStandards = new Standards.UDMCountryStandards();
objUDMCountryStandards.Operation = "SELECT";
if (Dispatcher.CheckAccess())
{
objUDMCountryStandards.Country = txtSearchCountry.Text.Trim() != string.Empty ? txtSearchCountry.Text : null;
}
else
{
this.Dispatcher.Invoke(() =>
{
objUDMCountryStandards.Country = txtSearchCountry.Text.Trim() != string.Empty ? txtSearchCountry.Text : null;
});
}
DataSet dsCountryStandards = objStandardsBusinessLayer.GetCountryStandards(objUDMCountryStandards);
// ... rest of your code
}
By implementing either of these methods, you guarantee that UI updates are performed on the main thread, preventing the "cross-thread operation" exception and maintaining UI responsiveness. Remember to replace placeholders like objUDMCountryStandards and txtSearchCountry with your actual variable names.
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