We can use CustomExceptionHandler for this. Below code might help you.
using System;
using System.Threading;
using System.Windows.Forms;
// Create a form with a button that, when clicked, throws an exception.
public class ErrorForm : System.Windows`enter code here`.Forms.Form
{
internal Button button1;
public ErrorForm() : base()
{
// Add the button to the form.
this.button1 = new System.Windows.Forms.Button();
this.SuspendLayout();
this.button1.Location = new System.Drawing.Point(100, 43);
this.button1.Size = new System.Drawing.Size(75, 23);
this.button1.Text = "Click!";
this.Controls.Add(this.button1);
this.button1.Click += new EventHandler(this.button1_Click);
this.Text = "ThreadException";
this.ResumeLayout(false);
}
// Throw an exception when the button is clicked.
private void button1_Click(object sender, System.EventArgs e)
{
throw new ArgumentException("The parameter was invalid");
}
public static void Main()
{
// Add the event handler.
Application.ThreadException += new ThreadExceptionEventHandler(CustomExceptionHandler.OnThreadException);
// Start the example.
Application.Run(new ErrorForm());
}
}
// Create a class to handle the exception event.
internal class CustomExceptionHandler
{
// Handle the exception event
public static void OnThreadException(object sender, ThreadExceptionEventArgs t)
{
DialogResult result = ShowThreadExceptionDialog(t.Exception);
// Exit the program when the user clicks Abort.
if (result == DialogResult.Abort)
Application.Exit();
}
// Create and display the error message.
private static DialogResult ShowThreadExceptionDialog(Exception e)
{
string errorMsg = "An error occurred. Please contact the adminstrator " +
"with the following information:\n\n";
errorMsg += String.Format("Exception Type: {0}\n\n", e.GetType().Name);
errorMsg += "\n\nStack Trace:\n" + e.StackTrace;
return MessageBox.Show(errorMsg, "Application Error",
MessageBoxButtons.AbortRetryIgnore, MessageBoxIcon.Stop);
}
}
2nd approach:-
using System;
using System.IO;
using System.Threading.Tasks;
class Example
{
static async Task Main(string[] args)
{
// Get a folder path whose directories should throw an UnauthorizedAccessException.
string path = Directory.GetParent(
Environment.GetFolderPath(
Environment.SpecialFolder.UserProfile)).FullName;
// Use this line to throw UnauthorizedAccessException, which we handle.
Task<string[]> task1 = Task<string[]>.Factory.StartNew(() => GetAllFiles(path));
// Use this line to throw an exception that is not handled.
// Task task1 = Task.Factory.StartNew(() => { throw new IndexOutOfRangeException(); } );
try {
await task1;
}
catch (AggregateException ae) {
ae.Handle((x) =>
{
if (x is UnauthorizedAccessException) // This we know how to handle.
{
Console.WriteLine("You do not have permission to access all folders in this path.");
Console.WriteLine("See your network administrator or try another path.");
return true;
}
return false; // Let anything else stop the application.
});
}
Console.WriteLine("task1 Status: {0}{1}", task1.IsCompleted ? "Completed," : "",
task1.Status);
}
static string[] GetAllFiles(string str)
{
// Should throw an UnauthorizedAccessException exception.
return System.IO.Directory.GetFiles(str, "*.txt", System.IO.SearchOption.AllDirectories);
}
}