想在wpf项目中方便地测试某些功能代码，在启动时,怎么以控制台的方式启动？也就是启动时调用控制台程序,开始时不启用窗体，启用某个类的Main方法。,

Question

想在wpf项目中方便地测试程序，每次都得从主窗口进入到测试功能的地方进行测试，这很麻烦。还有测试从Nuget包中下载的某些组件中某些类的功能，若创建另一个控制台程序就得下载两次。

在wpf项目中,在启动时,怎么以控制台的方式启动，也就是调用某个类的Main方法,不调用窗口程序？

Answer 1

修改Main启动方法

 public partial class App : Application

 {
        private static IKernel _kernel;

        protected override void OnStartup(StartupEventArgs e)
        {          
            base.OnStartup(e);
            base.ShutdownMode = ShutdownMode.OnMainWindowClose;
            //具体来说，就是在这里添加需要使用的方法
        }

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Answer 2

Hi,

请参考下面的代码，下面的类可以让你的WPF程序附加一个控制台.

using System;
using System.Diagnostics;
using System.IO;
using System.Runtime.InteropServices;
using System.Security;

[SuppressUnmanagedCodeSecurity]
public static class ConsoleManager
{
    private const string Kernel32_DllName = "kernel32.dll";

    [DllImport(Kernel32_DllName)]
    private static extern bool AllocConsole();

    [DllImport(Kernel32_DllName)]
    private static extern bool FreeConsole();

    [DllImport(Kernel32_DllName)]
    private static extern IntPtr GetConsoleWindow();

    [DllImport(Kernel32_DllName)]
    private static extern int GetConsoleOutputCP();

    public static bool HasConsole
    {
        get { return GetConsoleWindow() != IntPtr.Zero; }
    }

    /// <summary>
    /// Creates a new console instance if the process is not attached to a console already.
    /// </summary>
    public static void Show()
    {
        //#if DEBUG
        if (!HasConsole)
        {
            AllocConsole();
            InvalidateOutAndError();
        }
        //#endif
    }

    /// <summary>
    /// If the process has a console attached to it, it will be detached and no longer visible. Writing to the System.Console is still possible, but no output will be shown.
    /// </summary>
    public static void Hide()
    {
        //#if DEBUG
        if (HasConsole)
        {
            SetOutAndErrorNull();
            FreeConsole();
        }
        //#endif
    }

    public static void Toggle()
    {
        if (HasConsole)
        {
            Hide();
        }
        else
        {
            Show();
        }
    }

    static void InvalidateOutAndError()
    {
        Type type = typeof(System.Console);

        System.Reflection.FieldInfo _out = type.GetField("_out",
            System.Reflection.BindingFlags.Static | System.Reflection.BindingFlags.NonPublic);

        System.Reflection.FieldInfo _error = type.GetField("_error",
            System.Reflection.BindingFlags.Static | System.Reflection.BindingFlags.NonPublic);

        System.Reflection.MethodInfo _InitializeStdOutError = type.GetMethod("InitializeStdOutError",
            System.Reflection.BindingFlags.Static | System.Reflection.BindingFlags.NonPublic);

        Debug.Assert(_out != null);
        Debug.Assert(_error != null);

        Debug.Assert(_InitializeStdOutError != null);

        _out.SetValue(null, null);
        _error.SetValue(null, null);

        _InitializeStdOutError.Invoke(null, new object[] { true });
    }

    static void SetOutAndErrorNull()
    {
        Console.SetOut(TextWriter.Null);
        Console.SetError(TextWriter.Null);
    }
}

WPF默认的的程序启动入口是在APP类(继承于Application类)中, 通过StartupUri设置启动的窗体类。你可以在重写的OnStartup方法中调用 ConsoleManager.Show()方法来显示控制台。

   public partial class App : Application
    {
        protected override void OnStartup(StartupEventArgs e)
        {
            base.OnStartup(e);
            {
                ConsoleManager.Show();
            }
        }
    }

你也可以自定义应用程序的启动类，在Main方法中调用ConsoleManager.Show()方法来显示控制台。

  public class StartUp
    {
        [STAThread]
        public static void Main(string[] args)
        {
            ConsoleManager.Show();
        }
    }

注意：此时你需要在项目属性里修改程序的启动对象。

Best Regards,

Bob

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