COM->.NET - 无法访问重载方法

我正在尝试访问 .Net 库（图像调整器）来自 COM（jscript）。

我已经尝试过 IDispatch 和类接口生成，以及相关类上的 [ClassInterface( ClassInterfaceType.AutoDual)] 。

有一个方法有 3 个重载：

Bitmap Build(object, ResizeSettings settings)
void Build(object source, object dest, string settings)
void Build(object source, object dest, ResizeSettings settings)

Calling

Build("file",s); //works

以下两者都会生成“参数数量错误或属性分配无效”（JScript 运行时错误）

Build("file","file", s) 
Build("file","file","settings

我找不到任何理由认为重载不能通过互操作工作，特别是当参数计数不同时。 我错过了什么吗？

更新：这是方法定义的完整代码。第二个过载是无法访问的。不仅仅是这些方法 - 在每个重载方法中，我似乎只能访问第一个重载。这是一个未记录的 COM 错误/设计缺陷吗？

    /// <summary>
    /// Provides methods for generating resized images, and for reading and writing them to disk.
    /// Use ImageBuilder.Current to get the current instance (as configured in the application configuration), or use ImageBuilder.Current.Create() to control which extensions are used.
    /// </summary>
    public class ImageBuilder : AbstractImageProcessor, IQuerystringPlugin
    {


        /// <summary>
        /// Resizes and processes the specified source image and returns a bitmap of the result.
        /// This method assumes that transparency will be supported in the final output format, and therefore does not apply a matte color. Use &amp;bgcolor to specify a background color
        /// if you use this method with a non-transparent format such as Jpeg.
        /// </summary>
        /// <param name="source">May be an instance of string (a physical path), VirtualFile, IVirtualBitmapFile, HttpPostedFile, Bitmap, Image, or Stream.</param>
        /// <param name="settings">Resizing and processing command to apply to the.</param>
        public virtual Bitmap Build(object source, ResizeSettings settings) {
            BitmapHolder bh = new BitmapHolder();
            Build(source, bh, settings);
            return bh.bitmap;
        }

        /// <summary>
        /// Resizes and processes the specified source image and stores the encoded result in the specified destination. 
        /// </summary>
        /// <param name="source">May be an instance of string (a physical path or app-relative virtual path), VirtualFile, IVirtualBitmapFile, HttpPostedFile, Bitmap, Image, or Stream. app-relative virtual paths will use the VirtualPathProvider system</param>
        /// <param name="dest">May be a physical path (string), or a Stream instance. Does not have to be seekable.</param>
        /// <param name="settings">Resizing and processing command to apply to the.</param>
        public virtual void Build(object source, object dest, ResizeSettings settings) {
            ResizeSettings s = new ResizeSettings(settings);

确实，COM 不“执行”方法重载。

但。看http://msdn.microsoft.com/en-us/library/ms182197(v=vs.80).aspx .

这是静态分析工具 FxCop 的文档页面。但其中有一些信息对 COM 开发人员很有用：

当重载方法暴露给 COM 客户端时，只有第一个方法重载保留其名称。后续重载通过在名称后附加下划线字符“_”和与重载声明顺序相对应的整数来唯一重命名。

并且还看到
COM 互操作 (CCW) 中的重载 - IDispatch 名称包括后缀（_2、_3 等）

因此，通过 COM 层，您可以使用以下命令调用原始方法

Build_2("file", "file", s);
Build_3("file", "file", settings);