在 IE9 中使用 Watin 下载文件

Question

我在自动执行从网站下载文件的过程时遇到问题。该网站有一个 Java 按钮，单击该按钮会触发 Excel 文件的下载。我正在使用最新版本的 Watin (v2.1)。

我已经成功让 Watin 登录该网站，导航到相应的页面，更改页面上的参数，然后单击按钮开始下载。

但是，当下载完成后，会出现 IE9 下载框，但没有任何反应，直到 Watin 超时。

我将不胜感激任何建议，因为我看不到任何下载文件或保存文件的方法。即使它将“Alt+S”传递到页面，也会保存它。我尝试通过 WatinTestRecorder 运行它，但不会提示保存。

using (var browser = new IE(sLogin))
{
    browser.AddDialogHandler(new OKDialogHandler());
    browser.AddDialogHandler(new DialogHandlerHelper());
    browser.AddDialogHandler(new ConfirmDialogHandler());
    browser.AddDialogHandler(new ReturnDialogHandlerIe9());

    browser.TextField(Find.ByName("txtUserID")).TypeText("username");
    browser.TextField(Find.ByName("txtPassword")).TypeText("password");
    browser.Button(Find.ByName("btnLogin")).Click();

    browser.WaitForComplete();  
    browser.GoTo(targetUri);

    browser.SelectList("ctl00_phFormContent_ucOptionParam0_lst").SelectByValue("4");

    browser.Button(Find.ByName("ctl00$phFormButtonBar$btnRun")).Click();
    browser.WaitForComplete();

    //Some code to download the file here!
}

Answer 1

自版本 1.1.0.4000 起应支持此功能。该版本的发行说明不再在线 (http://watin.org/documentation/)，但我在谷歌缓存中找到了它（http://svn6.assembla.com/svn/ci-samples/dotnet/watir/website/releasenotes-1-1-0-4000.html）

应该是这样的：

using(IE ie = new IE(someUrlToGoTo))
{
    FileDownloadHandler fileDownloadHandler = new FileDownloadHandler(fullFileName);
    ie.AddDialogHandler(fileDownloadHandler);

    ie.Link("startDownloadLinkId").Click();

    fileDownloadHandler.WaitUntilFileDownloadDialogIsHandled(15);
    fileDownloadHandler.WaitUntilDownloadCompleted(200);
}

编辑：
经过下面的评论，这个答案被接受。所以我假设以下代码有效（取自我上一条评论中的 SourceForge 链接，请注意 ClickNoWait）：

using(IE ie = new IE(someUrlToGoTo))
{
    FileDownloadHandler fileDownloadHandler = new FileDownloadHandler(fullFileName);
    ie.AddDialogHandler(fileDownloadHandler);

    ie.Link("startDownloadLinkId").ClickNoWait();

    fileDownloadHandler.WaitUntilFileDownloadDialogIsHandled(15);
    fileDownloadHandler.WaitUntilDownloadCompleted(200);
}

Answer 2

接受的答案对我不起作用，因为 IE 9 会弹出一个“通知”，您必须导航才能进入实际的“另存为”对话框（并且 WatiN 无法自动处理通知）。我点击了鲍里斯·巴甫洛夫（Borris Pavlov）的链接，该链接很好地指明了方向。我稍微清理了发布在那里的代码，这就是生成的文件：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using WatiN.Core;
using WatiN.Core.Native.Windows;
using System.Threading;
using System.Windows.Automation;

namespace MyProject
{
    public static class BrowserExtensionMethods
    {
        public static void DownloadIeFile(this IE browser,string saveAsFilename=null)
        {
            // see information here (http://msdn.microsoft.com/en-us/library/windows/desktop/ms633515(v=vs.85).aspx)
            Window windowMain = new Window(NativeMethods.GetWindow(browser.hWnd, 5));
            TreeWalker dialogElementTreeWalker = new TreeWalker(Condition.TrueCondition);
            AutomationElement mainWindow = dialogElementTreeWalker.GetParent(AutomationElement.FromHandle(browser.hWnd));

            Window windowDialog = new Window(NativeMethods.GetWindow(windowMain.Hwnd, 5));
            // if doesn't work try to increase sleep interval or write your own waitUntill method
            Thread.Sleep(1000);
            windowDialog.SetActivate();
            AutomationElementCollection dialogElements = AutomationElement.FromHandle(windowDialog.Hwnd).FindAll(TreeScope.Children, Condition.TrueCondition);

            if (string.IsNullOrEmpty(saveAsFilename))
            {
                ClickSave(dialogElements);
            }
            else
            {
                ClickSaveAs(mainWindow, dialogElements,saveAsFilename);
            }
        }

        private static void ClickSaveAs(AutomationElement mainWindow, AutomationElementCollection dialogElements,string filename)
        {
            foreach (AutomationElement element in dialogElements)
            {

                if (element.Current.Name.Equals("Save"))
                {
                    AutomationElementCollection dialogSubElements = element.FindAll(TreeScope.Children, Automation.ControlViewCondition);
                    InvokePattern clickPatternForSaveDropdown = (InvokePattern)dialogSubElements[0].GetCurrentPattern(AutomationPattern.LookupById(10000));
                    clickPatternForSaveDropdown.Invoke();
                    Thread.Sleep(3000);

                    AutomationElementCollection dialogElementsInMainWindow = mainWindow.FindAll(TreeScope.Children, Condition.TrueCondition);
                    foreach (AutomationElement currentMainWindowDialogElement in dialogElementsInMainWindow)
                    {
                        if (currentMainWindowDialogElement.Current.LocalizedControlType == "menu")
                        {
                            // first array element 'Save', second array element 'Save as', third second array element    'Save and open'
                            InvokePattern clickMenu = (InvokePattern)currentMainWindowDialogElement.FindAll(TreeScope.Children, Condition.TrueCondition)[1].GetCurrentPattern(AutomationPattern.LookupById(10000));
                            clickMenu.Invoke();
                            Thread.Sleep(5000);
                            ControlSaveDialog(mainWindow, filename);
                            break;

                        }
                    }
                }
            }
        }

        private static void ClickSave(AutomationElementCollection dialogElements)
        {
            foreach (AutomationElement element in dialogElements)
            {
                // You can use "Save ", "Open", ''Cancel', or "Close" to find necessary button Or write your own enum
                if (element.Current.Name.Equals("Save"))
                {
                    // if doesn't work try to increase sleep interval or write your own waitUntil method
                    // WaitUntilButtonExsist(element,100);
                    Thread.Sleep(1000);
                    AutomationPattern[] automationPatterns = element.GetSupportedPatterns();
                    // replace this foreach if you need 'Save as' with code bellow
                    foreach (AutomationPattern currentPattern in automationPatterns)
                    {
                        // '10000' button click event id 
                        if (currentPattern.Id == 10000)
                        {
                            InvokePattern click = (InvokePattern)element.GetCurrentPattern(currentPattern);
                            click.Invoke();
                        }
                    }
                }
            }
        }

        private static void ControlSaveDialog(AutomationElement mainWindow, string path)
        {
            //obtain the save as dialog
            //*** must disable throwing of the NonComVisibleBaseClass "exception" for this to work in debug mode:
            //              1. Navigate to Debug->Exceptions...
            //              2. Expand "Managed Debugging Assistants"
            //              3. Uncheck the NonComVisibleBaseClass Thrown option.
            //              4. Click [Ok]
            //***copied from http://social.msdn.microsoft.com/Forums/en-US/27c3bae8-41fe-4db4-8022-e27d333f714e/noncomvisiblebaseclass-was-detected?forum=Vsexpressvb

            var saveAsDialog = mainWindow.FindFirst(TreeScope.Descendants, new PropertyCondition(AutomationElement.NameProperty, "Save As"));
            //var saveAsDialog = mainWindow.FindFirst(TreeScope.Descendants, new PropertyCondition(AutomationElement.NameProperty, "[#] Save As [#]"));  //needed if using sandboxie
            //get the file name box
            var saveAsText = saveAsDialog
                    .FindFirst(TreeScope.Descendants,
                               new AndCondition(
                                   new PropertyCondition(AutomationElement.NameProperty, "File name:"),
                                   new PropertyCondition(AutomationElement.ControlTypeProperty, ControlType.Edit)))
                    .GetCurrentPattern(ValuePattern.Pattern) as ValuePattern;
            //fill the filename box 
            saveAsText.SetValue(path);

            Thread.Sleep(1000);
            //find the save button
            var saveButton =
                    saveAsDialog.FindFirst(TreeScope.Descendants,
                    new AndCondition(
                        new PropertyCondition(AutomationElement.NameProperty, "Save"),
                        new PropertyCondition(AutomationElement.ControlTypeProperty, ControlType.Button)));
            //invoke the button
            var pattern = saveButton.GetCurrentPattern(InvokePattern.Pattern) as InvokePattern;
            pattern.Invoke();
        }
    }
}

请参阅 ControlSaveDialog 方法中的注释，了解有关如何使其作为调试构建（VS 设置）工作的信息。

我实际上只测试了“另存为”操作，所以我希望其他的作品（似乎原始海报添加了“另存为”作为事后的想法，所以我的猜测是他更彻底地测试了“保存”操作）。

要调用它，您可以使用一些代码，例如：

Link lastMp4Link = mp4Links[mp4Links.Count - 1];  //mp4Links is a WatiN.Core.LinkCollection
lastMp4Link.Click();

browser.DownloadIeFile(string.Format(@"c:\temp\myFile.blah"));  //"browser" is a WatiN.Core.IE object

Answer 3

我刚刚从 Watin 用户邮件列表中得知 FileDownloadHandler 在 IE9 中被破坏了。目前还没有修复，但是我卸载了 IE9（回滚到 IE8），它有由 WatiN 处理的旧样式对话框。

Answer 4

Watin 找不到下载对话框和对话框按钮。可以用这个来解决。

如何使用 Watin / IE9 测试文件下载？

查看评论

Answer 5

使用 WaitN 进行多次修改后，我最终使用了 Selenium。它使您可以更好地控制正在处理和使用的内容，并允许您使用更现代的网络浏览器。