How Do I Implement Global Exception Handling in a .NET Console Application?

Global exception handling in .NET console application

Handling unhandled exceptions is critical to maintaining application stability and providing a consistent user experience. In .NET, defining a global exception handler for a console application allows you to intercept and respond to exceptions that occur anywhere in the application.

Detailed solution

Unlike ASP.NET applications (which use global.asax) or Windows applications and services (which use the UnhandledExceptionEventHandler event), console applications require a slightly different approach.

Implementation method

To set a global exception handler in a .NET console application:

<code class="language-csharp">using System;

namespace MyConsoleApp
{
    class Program
    {
        static void Main(string[] args)
        {
            AppDomain.CurrentDomain.UnhandledException += MyExceptionHandler; // VB.NET需要"AddHandler"前缀

            throw new Exception("自定义异常"); // 演示未处理异常
        }

        static void MyExceptionHandler(object sender, UnhandledExceptionEventArgs e)
        {
            Console.WriteLine($"未处理异常: {e.ExceptionObject}");
            Console.WriteLine("按Enter键继续...");
            Console.ReadLine();
            Environment.Exit(1);
        }
    }
}</code>

Instructions for Visual Basic Users

In VB.NET, the "AddHandler" keyword must be used before the event delegate (in this case, UnhandledException). This is due to differences in the way VB.NET and C# handle event subscriptions.

Limitations

It is important to note that this technique does not catch type and file loading exceptions generated by the runtime before the Main() method begins execution. To handle such exceptions, defer JIT compilation by moving the risky code into a separate method and applying the [MethodImpl(MethodImplOptions.NoInlining)] attribute.

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