ActiveX 控件中調用 JavaScript 方法

1. 添加接口 【IOleContainer】，代碼如下

[ComImport, Guid("0000011B-0000-0000-C000-000000000046"), InterfaceTypeAttribute(ComInterfaceType.InterfaceIsIUnknown)]
public interface IOleContainer
{
        void EnumObjects([In, MarshalAs(UnmanagedType.U4)] int grfFlags, [Out, MarshalAs(UnmanagedType.LPArray)] object[] ppenum);
        void ParseDisplayName([In, MarshalAs(UnmanagedType.Interface)] object pbc, [MarshalAs(UnmanagedType.BStr)] string pszDisplayName, [Out, MarshalAs(UnmanagedType.LPArray)] int[] pchEaten, [Out, MarshalAs(UnmanagedType.LPArray)] object[] ppmkOut);
        void LockContainer([In, MarshalAs(UnmanagedType.I4)] int fLock);
}

2. 添加接口 【IOleClientSite】，代碼如下

[Guid("00000118-0000-0000-C000-000000000046"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
public interface IOleClientSite
{
        void SaveObject();
        void GetMoniker(uint dwAssign, uint dwWhichMoniker, object ppmk);
        void GetContainer(out IOleContainer ppContainer);
        void ShowObject();
        void OnShowWindow(bool fShow);
        void RequestNewObjectLayout();
}

3. 調用JS方法的代碼如下

參數 functionName 為 JS 方法名稱

參數 paras 是 String 類型，可以使用特定規則組合多個值

private void CallJavaScriptMethod(string functionName, string paras)
{
            BindingFlags bindingFlags = BindingFlags.Instance | BindingFlags.InvokeMethod | BindingFlags.Public;

            Type typeIOleObject = this.GetType().GetInterface("IOleObject", true);
            object objClientSite = typeIOleObject.InvokeMember("GetClientSite", bindingFlags, null, this, null);

            IOleClientSite oleClientSite = objClientSite as IOleClientSite;
            IOleContainer oleContainer;
            oleClientSite.GetContainer(out oleContainer);

            object[] args = new object[1];
            args[0] = paras;

            IHTMLDocument htmlDocument = (IHTMLDocument)oleContainer;
            object script = htmlDocument.Script;

            try
            {
                script.GetType().InvokeMember(functionName, bindingFlags, null, script, args);
            }
            catch { }
}