在运行时使用LegacyV2RuntimeActivationPolicy。管理DirectX

Question

我正在使用Managed DirectX和C＃，并且不想在我的应用程序中使用App.Config。这是一个有效的app配置示例

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <startup useLegacyV2RuntimeActivationPolicy="true">
    <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5" />
  </startup>
</configuration>

这是我关注的帖子

http://reedcopsey.com/2011/09/15/setting-uselegacyv2runtimeactivationpolicy-at-runtime/

一些不同的运行时如何绑定到旧版CLR第2版激活策略。为什么是这样？我知道这段代码来自2011年，混合模式装配加载的方式有所改变吗？还有办法在没有App.Config的情况下设置useLegacyV2RuntimeActivationPolicy吗？

这是应该有效的代码，但不是。

using System;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
using System.Windows.Forms;

namespace TestWindow
{
   public static class RuntimePolicyHelper
   {

   public static bool LegacyV2RuntimeEnabledSuccessfully { get; private set; }

    static RuntimePolicyHelper()
    {
        var clrRuntimeInfo =
                (ICLRRuntimeInfo)RuntimeEnvironment.GetRuntimeInterfaceAsObject(
                Guid.Empty,
                typeof(ICLRRuntimeInfo).GUID);
        try
        {
            clrRuntimeInfo.BindAsLegacyV2Runtime();
            LegacyV2RuntimeEnabledSuccessfully = true;
        }
        catch (COMException)
        {
            // This occurs with an HRESULT meaning 
            // "A different runtime was already bound to the legacy CLR version 2 activation policy."
            LegacyV2RuntimeEnabledSuccessfully = false;
        }
    }

    [ComImport]
    [InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
    [Guid("BD39D1D2-BA2F-486A-89B0-B4B0CB466891")]
    private interface ICLRRuntimeInfo
    {
        void xGetVersionString();
        void xGetRuntimeDirectory();
        void xIsLoaded();
        void xIsLoadable();
        void xLoadErrorString();
        void xLoadLibrary();
        void xGetProcAddress();
        void xGetInterface();
        void xSetDefaultStartupFlags();
        void xGetDefaultStartupFlags();

        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        void BindAsLegacyV2Runtime();
    }

}
internal static class Program
{
    /// <summary>
    ///     The main entry point for the application.
    /// </summary>
    [STAThread]
    private static void Main()
    {
        if (RuntimePolicyHelper.LegacyV2RuntimeEnabledSuccessfully)
        {
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            Application.Run(new TestWindow());
        }
        else
        {
            MessageBox.Show("useLegacyV2RuntimeActivationPolicy failed", "Error",MessageBoxButtons.OK,MessageBoxIcon.Error);
        }
    }
}

}