如何在C＃中使用webbrowser處理消息框？

Question

我正在使用C＃的webbrowswer功能。 嘗試通過我的應用程序登錄網站。 一切都很順利，除非輸入錯誤的ID或密碼時，會彈出一個小消息框（在網頁上設置）彈出並阻止所有內容，直到點擊“確定”。

所以問題是：有沒有辦法管理這個小窗口（比如閱讀里面的文字）？ 如果真的那么棒！ 但是，如果沒有辦法做到這一點，那么無論如何只是讓這個消息框以編程方式消失？

Answer 1

您可以通過從user32.dll導入一些窗口函數並通過它的類名和窗口名稱獲取消息框對話框的句柄來“管理”消息框對話框。 例如，單擊其“確定”按鈕：

public class Foo
{
    [DllImport("user32.dll", SetLastError = true)]
    static extern IntPtr FindWindowEx(IntPtr hwndParent, IntPtr hwndChildAfter, string lpszClass, string lpszWindow);

    [DllImport("user32.dll", EntryPoint = "FindWindow", SetLastError = true)]
    private static extern IntPtr FindWindow(string lpClassName, string lpWindowName);

    [DllImport("user32.dll", CharSet = CharSet.Auto)]
    static extern IntPtr SendMessage(IntPtr hWnd, UInt32 Msg, IntPtr wParam, IntPtr lParam);


    private void ClickOKButton()
    {
        IntPtr hwnd = FindWindow("#32770", "Message from webpage");
        hwnd = FindWindowEx(hwnd, IntPtr.Zero, "Button", "OK");
        uint message = 0xf5;
        SendMessage(hwnd, message, IntPtr.Zero, IntPtr.Zero);
    }
}

一些來自MSDN的閱讀材料 。

Answer 2

從Sires anwser復制粘貼： https ：//stackoverflow.com/a/251524/954225

private void InjectAlertBlocker() {
    HtmlElement head = webBrowser1.Document.GetElementsByTagName("head")[0];
    HtmlElement scriptEl = webBrowser1.Document.CreateElement("script");
    IHTMLScriptElement element = (IHTMLScriptElement)scriptEl.DomElement;
    string alertBlocker = "window.alert = function () { }";
    element.text = alertBlocker;
    head.AppendChild(scriptEl);
}

Answer 3

這是Saeb答案的精煉版。 Saeb的代碼對我不起作用，我再添加一步來激活按鈕然后點擊它。

using System;
using System.Runtime.InteropServices;

namespace IE_Automation
{
public class IEPoppupWindowClicker
{
    [DllImport("user32.dll", SetLastError = true)]
    static extern IntPtr FindWindowEx(IntPtr hwndParent, IntPtr hwndChildAfter, string lpszClass, string lpszWindow);

    [DllImport("user32.dll", EntryPoint = "FindWindow", SetLastError = true)]
    private static extern IntPtr FindWindow(string lpClassName, string lpWindowName);

    [DllImport("user32.dll", CharSet = CharSet.Auto)]
    static extern IntPtr SendMessage(IntPtr hWnd, UInt32 Msg, int wParam, int lParam);
    private const int BM_CLICK = 0xF5;
    private const uint WM_ACTIVATE = 0x6;
    private const int WA_ACTIVE = 1;

    public void ActivateAndClickOkButton()
    {
        // find dialog window with titlebar text of "Message from webpage"

        var hwnd = FindWindow("#32770", "Message from webpage");
        if (hwnd != IntPtr.Zero)
        {
            // find button on dialog window: classname = "Button", text = "OK"
            var btn = FindWindowEx(hwnd, IntPtr.Zero, "Button", "OK");
            if (btn != IntPtr.Zero)
            {
                // activate the button on dialog first or it may not acknowledge a click msg on first try
                SendMessage(btn, WM_ACTIVATE, WA_ACTIVE, 0);
                // send button a click message

                SendMessage(btn, BM_CLICK, 0, 0);
            }
            else
            {
                //Interaction.MsgBox("button not found!");
            }
        }
        else
        {
            //Interaction.MsgBox("window not found!");
        }

    }
}
}