C# 调用Webbrowser上下文菜单

我正在做一个项目，一个网络机器人，它利用了网络浏览器控件

我的目标是以编程方式打开加载的WebBrowser中所需元素的WebBrowser上下文菜单，并从上下文菜单中选择一个选项

示例：

在WebBrowser控件中导航到Google。 打开上下文菜单。选择“显示图片”

到目前为止，这是我找到的最接近的代码：

到目前为止，这段代码在第一行返回一个错误，这里有解决方案吗

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工作备选方案： 到目前为止，我已经通过模拟点击实现了这一点，问题是当窗口被隐藏时，会出现明显的错误。我也不希望光标在屏幕上跳跃。如果有一种方法可以模拟隐藏窗口上的点击，那么这可能是一个解决方案。 下面是我当前模拟点击的代码：（虽然我不想使用模拟点击，但这段代码可以工作）

如果有办法通过调用WebBrowsers ContextMenu完成此过程

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凹凸。

这取决于您的具体要求。如果您想操作特定的HTML元素，可以通过DOM访问它。依我看，你可以做WebBrowser能做的一切

如果要使用上下文菜单（避免编写额外代码或假装用户操作），可以在所需位置发送鼠标单击，然后临时阻止上下文菜单弹出窗口。这是我在Delphi中的示例代码，供您参考

function TTrident.ShowContextMenu(const dwID: DWORD; const ppt: PPOINT; const pcmdtReserved: IUnknown;
  const pdispReserved: IDispatch): HRESULT;
begin
  if FDontShowContextMenuThisTime then
  begin
    FDontShowContextMenuThisTime := False;
    Exit(S_OK);
  end
  else
    Exit(S_FALSE);
end;

ShowContextMenu

是界面

IDocHostUIHandler

的一种方法。换句话说，您必须通过实现至少

IDocHostUIHandler

来扩展WebBrowser控件

        Point controlLoc = this.PointToScreen(webbrowser1.Location);
        controlLoc.X = controlLoc.X + webbrowser1.Document.GetElementById("sbvdcapimg").OffsetRectangle.Left+65;
        controlLoc.Y = controlLoc.Y + webbrowser1.Document.GetElementById("sbvdcapimg").OffsetRectangle.Top+50;
        Cursor.Position = controlLoc;
        MouseSimulator.ClickRightMouseButton();
        controlLoc.X = controlLoc.X + (webbrowser1.Document.GetElementById("sbvdcapimg").OffsetRectangle.Left + 95);
        controlLoc.Y = controlLoc.Y + (webbrowser1.Document.GetElementById("sbvdcapimg").OffsetRectangle.Top + 45);
        Cursor.Position = controlLoc;
        MouseSimulator.ClickLeftMouseButton();

public class MouseSimulator
{
    [DllImport("user32.dll", SetLastError = true)]
    static extern uint SendInput(uint nInputs, ref INPUT pInputs, int cbSize);

    [StructLayout(LayoutKind.Sequential)]
    struct INPUT
    {
        public SendInputEventType type;
        public MouseKeybdhardwareInputUnion mkhi;
    }
    [StructLayout(LayoutKind.Explicit)]
    struct MouseKeybdhardwareInputUnion
    {
        [FieldOffset(0)]
        public MouseInputData mi;

        [FieldOffset(0)]
        public KEYBDINPUT ki;

        [FieldOffset(0)]
        public HARDWAREINPUT hi;
    }
    [StructLayout(LayoutKind.Sequential)]
    struct KEYBDINPUT
    {
        public ushort wVk;
        public ushort wScan;
        public uint dwFlags;
        public uint time;
        public IntPtr dwExtraInfo;
    }
    [StructLayout(LayoutKind.Sequential)]
    struct HARDWAREINPUT
    {
        public int uMsg;
        public short wParamL;
        public short wParamH;
    }
    struct MouseInputData
    {
        public int dx;
        public int dy;
        public uint mouseData;
        public MouseEventFlags dwFlags;
        public uint time;
        public IntPtr dwExtraInfo;
    }
    [Flags]
    enum MouseEventFlags : uint
    {
        MOUSEEVENTF_MOVE = 0x0001,
        MOUSEEVENTF_LEFTDOWN = 0x0002,
        MOUSEEVENTF_LEFTUP = 0x0004,
        MOUSEEVENTF_RIGHTDOWN = 0x0008,
        MOUSEEVENTF_RIGHTUP = 0x0010,
        MOUSEEVENTF_MIDDLEDOWN = 0x0020,
        MOUSEEVENTF_MIDDLEUP = 0x0040,
        MOUSEEVENTF_XDOWN = 0x0080,
        MOUSEEVENTF_XUP = 0x0100,
        MOUSEEVENTF_WHEEL = 0x0800,
        MOUSEEVENTF_VIRTUALDESK = 0x4000,
        MOUSEEVENTF_ABSOLUTE = 0x8000
    }
    enum SendInputEventType : int
    {
        InputMouse,
        InputKeyboard,
        InputHardware
    }

    public static void ClickRightMouseButton()
    {
        INPUT mouseDownInput = new INPUT();
        mouseDownInput.type = SendInputEventType.InputMouse;
        mouseDownInput.mkhi.mi.dwFlags = MouseEventFlags.MOUSEEVENTF_RIGHTDOWN;
        SendInput(1, ref mouseDownInput, Marshal.SizeOf(new INPUT()));

        INPUT mouseUpInput = new INPUT();
        mouseUpInput.type = SendInputEventType.InputMouse;
        mouseUpInput.mkhi.mi.dwFlags = MouseEventFlags.MOUSEEVENTF_RIGHTUP;
        SendInput(1, ref mouseUpInput, Marshal.SizeOf(new INPUT()));
    }

    public static void ClickLeftMouseButton()
    {

        INPUT mouseDownInput = new INPUT();
        mouseDownInput.type = SendInputEventType.InputMouse;
        mouseDownInput.mkhi.mi.dwFlags = MouseEventFlags.MOUSEEVENTF_LEFTDOWN;
        SendInput(1, ref mouseDownInput, Marshal.SizeOf(new INPUT()));

        INPUT mouseUpInput = new INPUT();
        mouseUpInput.type = SendInputEventType.InputMouse;
        mouseUpInput.mkhi.mi.dwFlags = MouseEventFlags.MOUSEEVENTF_LEFTUP;
        SendInput(1, ref mouseUpInput, Marshal.SizeOf(new INPUT()));
    }

function TTrident.ShowContextMenu(const dwID: DWORD; const ppt: PPOINT; const pcmdtReserved: IUnknown;
  const pdispReserved: IDispatch): HRESULT;
begin
  if FDontShowContextMenuThisTime then
  begin
    FDontShowContextMenuThisTime := False;
    Exit(S_OK);
  end
  else
    Exit(S_FALSE);
end;