WPF 使用Console.Write打印信息到控制台窗口中

    WPF中使用Console.Write函数来打印信息是没有意义的，因为并没有给其输出字符的窗口。对于桌面程序来说，这是十分合理的，然而有时为了方便调试，在程序编写过程中打印出信息给程序员看还是必要的，利用Windows的API,在DEBUG的时候打开一个控制台窗口以供信息打印显示。

创建一个管理类

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

　　在需要的地方调用： ConsoleManager.Show();//打开控制台窗口