WPF应用程序文件关联:DefaultIcon不工作

我要关联"。abc"文件到我的WPF应用程序

我使用以下代码添加关联:

public class FileAssociation
{
    static RegistryKey Root
    {
        get
        {
            return Registry.CurrentUser;
        }
    }
    // Associate file extension with progID, description, icon and application
    public static void Associate(string extension,
           string progID, string description, string application)
    {
        Require.NotNullOrEmpty(extension, "extension");
        Require.NotNullOrEmpty(progID, "progID");
        Require.NotNullOrEmpty(application, "application");
        Require.NotNullOrEmpty(description, "description");
        Root.CreateSubKey(extension).SetValue("", progID);
        using (var key = Root.CreateSubKey(progID))
        {
            key.SetValue("", description);
            key.CreateSubKey("DefaultIcon").SetValue("", ToShortPathName(application).Quote() + ",0");
            key.CreateSubKey(@"Shell'Open'Command").SetValue("", ToShortPathName(application).Quote() + " '"%1'"");
            // Tell explorer the file association has been changed
            SHChangeNotify(0x08000000, 0x0000, IntPtr.Zero, IntPtr.Zero);
        }
    }
    // Return true if extension already associated in registry
    public static bool IsAssociated(string extension)
    {
        return (Root.OpenSubKey(extension, false) != null);
    }
    [DllImport("shell32.dll", CharSet = CharSet.Auto, SetLastError = true)]
    public static extern void SHChangeNotify(uint wEventId, uint uFlags, IntPtr dwItem1, IntPtr dwItem2);
    [DllImport("Kernel32.dll")]
    private static extern uint GetShortPathName(string lpszLongPath,
        [Out] StringBuilder lpszShortPath, uint cchBuffer);
    // Return short path format of a file name
    private static string ToShortPathName(string longName)
    {
        StringBuilder s = new StringBuilder(1000);
        uint iSize = (uint)s.Capacity;
        uint iRet = GetShortPathName(longName, s, iSize);
        return s.ToString();
    }
}

注意: Quote()扩展方法仅用于使字符串abc变为"abc"。

现在文件关联工作正常!我可以双击"。abc"文件来打开我的WPF应用程序。

但是DefaultIcon不工作。DefaultIcon注册表项设置为""D:'path'to'MyWPFApp.exe",0"。我的WPF应用程序的应用程序图标被设置为属性页中的图标(我可以看到MyWPFApp.exe的图标已经更改)。怎么了?谢谢!

顺便说一句:我用。net 4在Windows 8