根据 almog.ori 的回答（其中有一些孤立的链接），我对链接的代码做了一些小改动，我困惑了几天：
MS Knowledgebase 帮助 (Archiv)，我采纳的完整代码：
using System.Runtime.InteropServices;
using System;
using System.Security;
using System.Security.Permissions;
using System.Collections;
using System.IO;
using System.Text;
namespace MyOfficeNetAddin
{
/// <devdoc>
/// This class is intended to use with the C# 'using' statement in
/// to activate an activation context for turning on visual theming at
/// the beginning of a scope, and have it automatically deactivated
/// when the scope is exited.
/// </devdoc>
[SuppressUnmanagedCodeSecurity]
internal class EnableThemingInScope : IDisposable
{
// Private data
private IntPtr cookie; // changed cookie from uint to IntPtr
private static ACTCTX enableThemingActivationContext;
private static IntPtr hActCtx;
private static bool contextCreationSucceeded = false;
public EnableThemingInScope(bool enable)
{
if (enable)
{
if (EnsureActivateContextCreated())
{
if (!ActivateActCtx(hActCtx, out cookie))
{
// Be sure cookie always zero if activation failed
cookie = IntPtr.Zero;
}
}
}
}
// Finalizer removed, that could cause Exceptions
// ~EnableThemingInScope()
// {
// Dispose(false);
// }
void IDisposable.Dispose()
{
Dispose(true);
GC.SuppressFinalize(this);
}
private void Dispose(bool disposing)
{
if (cookie != IntPtr.Zero)
{
if (DeactivateActCtx(0, cookie))
{
// deactivation succeeded...
cookie = IntPtr.Zero;
}
}
}
private bool EnsureActivateContextCreated()
{
lock (typeof(EnableThemingInScope))
{
if (!contextCreationSucceeded)
{
// Pull manifest from the .NET Framework install
// directory
string assemblyLoc = null;
FileIOPermission fiop = new FileIOPermission(PermissionState.None);
fiop.AllFiles = FileIOPermissionAccess.PathDiscovery;
fiop.Assert();
try
{
assemblyLoc = typeof(Object).Assembly.Location;
}
finally
{
CodeAccessPermission.RevertAssert();
}
string manifestLoc = null;
string installDir = null;
if (assemblyLoc != null)
{
installDir = Path.GetDirectoryName(assemblyLoc);
const string manifestName = "XPThemes.manifest";
manifestLoc = Path.Combine(installDir, manifestName);
}
if (manifestLoc != null && installDir != null)
{
enableThemingActivationContext = new ACTCTX();
enableThemingActivationContext.cbSize = Marshal.SizeOf(typeof(ACTCTX));
enableThemingActivationContext.lpSource = manifestLoc;
// Set the lpAssemblyDirectory to the install
// directory to prevent Win32 Side by Side from
// looking for comctl32 in the application
// directory, which could cause a bogus dll to be
// placed there and open a security hole.
enableThemingActivationContext.lpAssemblyDirectory = installDir;
enableThemingActivationContext.dwFlags = ACTCTX_FLAG_ASSEMBLY_DIRECTORY_VALID;
// Note this will fail gracefully if file specified
// by manifestLoc doesn't exist.
hActCtx = CreateActCtx(ref enableThemingActivationContext);
contextCreationSucceeded = (hActCtx != new IntPtr(-1));
}
}
// If we return false, we'll try again on the next call into
// EnsureActivateContextCreated(), which is fine.
return contextCreationSucceeded;
}
}
// All the pinvoke goo...
[DllImport("Kernel32.dll")]
private extern static IntPtr CreateActCtx(ref ACTCTX actctx);
// changed from uint to IntPtr according to
// https://www.pinvoke.net/default.aspx/kernel32.ActiveActCtx
[DllImport("Kernel32.dll", SetLastError = true)]
[return: MarshalAs(UnmanagedType.Bool)]
private static extern bool ActivateActCtx(IntPtr hActCtx, out IntPtr lpCookie);
// changed from uint to IntPtr according to
// https://www.pinvoke.net/default.aspx/kernel32.DeactivateActCtx
[DllImport("Kernel32.dll", SetLastError = true)]
[return: MarshalAs(UnmanagedType.Bool)]
private static extern bool DeactivateActCtx(int dwFlags, IntPtr lpCookie);
private const int ACTCTX_FLAG_ASSEMBLY_DIRECTORY_VALID = 0x004;
private struct ACTCTX
{
public int cbSize;
public uint dwFlags;
public string lpSource;
public ushort wProcessorArchitecture;
public ushort wLangId;
public string lpAssemblyDirectory;
public string lpResourceName;
public string lpApplicationName;
}
}
}
然后我就这样使用它：
using (new EnableThemingInScope(true))
{
// The call all this mucking about is here for.
VistaUnsafeNativeMethods.TaskDialogIndirect(ref config, out result, out radioButtonResult, out verificationFlagChecked);
}
在TaskDialogInterop.cs 中提供于WPF Task Dialog Wrapper on GitHub
有关EnableThemingInScope 的终结器中可能的SEHExceptions 的更多信息，请参阅此Question on SO