如名称的Win32部分所示System.ComponentModel.Win32Exception仅在处理传统样式的应用程序或代码时发生-应用程序必须调用直接操作系统调用，例如尝试执行其他应用程序。在本文中，我们将深入探讨System.ComponentModel.Win32异常。更详细地说，包括它在.NET异常层次结构中的位置。我们还将深入研究一些函数C#代码示例，以更好地说明如何System.ComponentModel.Win32Exceptions可能会在自己的编码中被抛出！

要点

  • 所有 .NET exceptions 继承自 System.Exception base class, 或者继承自inherited class.
  • System.SystemException 继承自 System.Exception class.
  • System.Runtime.InteropServices.ExternalException 直接继承自System.SystemException.
  • 最后, System.ComponentModel.Win32Exception 继承自 System.Runtime.InteropServices.ExternalException.

什么时候用它呢？

这个System.ComponentModel.Win32异常是在使用内部win32样式的操作系统调用时发生错误时在.NET应用程序中发生的最基本的异常类型。这些问题可能不同，从无效路径和文件找不到错误到网络地址问题和资源管理问题。因为System.ComponentModel.Win32Exceptions是旧形式异常的包装器，您可能遇到的每个可能的错误都有自己的NativeErrorCode属性值，它是一个32位整数，引用与引发的异常相关联的Win32错误代码值。
我们的示例代码开始。整个代码段如下所示，之后我们将更详细地讨论它：

usingSystem.Diagnostics;usingUtility;namespaceAirbrake.ComponentModel.Win32Exception

{classProgram

    {static void Main(string[] args)

        {

            StartProcessFromPath("c:/windows/notepad.exe");

            Logging.LineSeparator();

            StartProcessFromPath("c:/windows/invalid.exe");

        }static void StartProcessFromPath(stringpath)

        {try{//Create a new process with StartInfo.FileName set to provided path.
                var process = new Process { StartInfo = { FileName =path } };//Attempt to start the process using provided executable path.
                var success =process.Start();if(success)

                {

                    Logging.Log($"Successfully launched '{process.ProcessName.ToString()}' process!");//Sleep for two seconds to allow time for window to be shown.
                    System.Threading.Thread.Sleep(2000);//Kill process.
process.Kill();

                    Logging.Log($"Killed '{process.ProcessName.ToString()}' process.");

                }else{//This code never executes since we're catching//an exception from the process.Start() invocation line.
}

            }catch(System.ComponentModel.Win32Exception exception)

            {//Indicate failure to start.
                Logging.Log($"Unable to start process with executable path '{path}'.");//Output caught exception.
Logging.Log(exception);

                Logging.Log($"Native Win32 Error Code: {exception.NativeErrorCode}");

            }

        }

    }

}usingSystem;usingSystem.Collections;usingSystem.Collections.Generic;usingSystem.Diagnostics;usingSystem.Reflection;usingSystem.Text;namespaceUtility

{/// <summary>
    ///Houses all logging methods for various debug outputs./// </summary>
    public static classLogging

    {/// <summary>
        ///Outputs to<see cref="System.Diagnostics.Debug.WriteLine"/>if DEBUG mode is enabled,///otherwise uses standard<see cref="Console.WriteLine"/>./// </summary>
        /// <param name="value">Value to be output to log.</param>
        public static void Log(stringvalue)

        {#if DEBUGDebug.WriteLine(value);#elseConsole.WriteLine(value);#endif}/// <summary>
        ///When<see cref="Exception"/>parameter is passed, modifies the output to indicate///if<see cref="Exception"/>was expected, based on passed in `expected` parameter./// <para>Outputs the full<see cref="Exception"/>type and message.</para>
        /// </summary>
        /// <param name="exception">The<see cref="Exception"/>to output.</param>
        /// <param name="expected">Boolean indicating if<see cref="Exception"/>was expected.</param>
        public static void Log(Exception exception, bool expected = true)

        {string value = $"[{(expected ?"EXPECTED":"UNEXPECTED")}] {exception.ToString()}: {exception.Message}";#if DEBUGDebug.WriteLine(value);#elseConsole.WriteLine(value);#endif}/// <summary>
        ///Outputs a dashed line separator to<see cref="System.Diagnostics.Debug.WriteLine"/> 
        ///if DEBUG mode is enabled, otherwise uses standard<see cref="Console.WriteLine"/>./// </summary>
        public static voidLineSeparator()

        {#if DEBUGDebug.WriteLine(new string('-', 20));#elseConsole.WriteLine(new string('-', 20));#endif}

    }

}

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