How Can I Safely Update WPF UI Elements from a Background Thread?
Jan 11, 2025 pm 09:11 PM
Safe access to the UI (main) thread in WPF
In WPF applications, interacting with the UI thread from a non-UI thread (such as a background thread) can cause exceptions and crashes. This is because the UI thread has a scheduler that manages updates to the UI and ensures thread safety.
Question:
Consider the following code, which updates a DataGrid when a log file is modified:
private void watcher_Changed(object sender, FileSystemEventArgs e)
{
if (File.Exists(syslogPath))
{
...
DGAddRow(crp.Protocol, ft);
}
}
The DGAddRow method adds a new row to the DataGrid, which must be done on the UI thread. However, since watcher_Changed executes on a background thread, it attempts to modify the UI directly, causing an exception.
Solution:
To safely access the UI thread, use the Dispatcher.Invoke method of Application or any UIElement. This method allows you to execute code on the UI thread.
Application.Current.Dispatcher.Invoke(new Action(() => {
DGAddRow(crp.Protocol, ft);
}));
By using Dispatcher.Invoke, the code that updates the UI will be executed on the main thread, thus avoiding potential threading issues.
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