WPF工程打开控制台并输出 Output to console from a WPF application

来自Stackoverflow： http:// href="http://stackoverflow.com/questions/160587/no-output-to-console-from-a-wpf-application" target=_blank>stackoverflow.com/questions/160587/no-output-to-console-from-a-wpf-application

有时候我们需要在WPF项目中 console输出， 例如一些log，或者是实时反馈。 由于项目要求， 用户希望有两种访问方式， 一是双击打开界面（正常情况下），而是其他程序调用(只需要控制台形式的输入与输出)。

开始正题：



从Output type可以看到 Output已经限定。 除非在这里改用 Console Application，要不是不能直接访问 Console的。

Solution:

自己写一个静态类ConsoleManager 实现控制台的show or hide。

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

namespace DualQuad_to_Single_Converter
{
/// <summary>
/// Interaction logic for App.xaml
/// </summary>
public partial class App : Application
{
}

class Program
{
public static string InputArgu = "";
/// <summary>
/// 应用程序的主入口点。
/// </summary>
[STAThread]
static void Main(string[] args)
{
if (args.Length > 1)
{
InputArgu = args[1];
MessageBox.Show(args[1]);
}

ConsoleManager.Toggle();
System.Console.WriteLine("111");
//DualQuad_to_Single_Converter.App app = new DualQuad_to_Single_Converter.App();
//app.InitializeComponent();
//MainWindow windows = new MainWindow();
//app.MainWindow = windows;
//app.Run();
//App.Main();

//return "111";
}
}

[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);
}
static void SetOut(string A)
{

}

}
}

重写入口函数Main(). 实现控制台输入， 如果不需要可直接忽略