上传文件不工作 - 需要帮助 [英] Uploading Files Not Working - Need Assistance

问题描述

我要上传使用WebBrowser控件文件（影像）。似乎无法做到这一点，需要一些帮助。

I am trying to upload a file (an image) using the WebBrowser control. Can't seem to do it and need some help.

下面是HTML：

<form action="https://post.testsite.com/k/IOkurrwY4xGI_EJMbjF5pg/zMNsR" method="post" enctype="multipart/form-data">
    <input type="hidden" name="cryptedStepCheck" value="U2FsdGVkX18yNzEwMjcxMJdrv2IidjtpGSCPzHNblWk02eJAJ6DFXFXic-Am1lTPMYL7k7XDoH0">
    <input type="hidden" name="a" value="add">
    <input class="file" type="file" name="file" multiple="multiple">
    <button class="add" type="submit" name="go"  value="add image">add image</button>
</form>

下面是C＃code ...

Here is the C# code...

        elements = webBrowser.Document.GetElementsByTagName("input");
        foreach (HtmlElement file in elements)
        {
            if (file.GetAttribute("name") == "file")
            {
                file.Focus();
                file.InvokeMember("Click");
                SendKeys.Send("C:\\Images\\CCPhotoID.jpg" + "{ENTER}");
            }
        }

请注意，文件上传按钮出现，但不能输入任何文件名，文件名区域。

Note that the file upload button comes up, but can't input any filename into the file name area.

推荐答案

海事组织，你想要做的是确实是一个合法的场景UI测试自动化。 IIRC，在IE浏览器的早期版本有可能填充＆LT;输入类型=文件/＆GT; 字段的文件名，而不显示了选择文件对话框。出于安全原因，这已不再是可能的，所以你必须键发送到对话框。

IMO, what you're trying to do is indeed a legit scenario for UI testing automation. IIRC, in early versions of IE it was possible to populate the <input type="file"/> field with a file name, without showing up the Choose File dialog. For security reason, this is no longer possible, so you have to send keys to the dialog.

这里的问题是， file.InvokeMember（点击）显示一个模式对话框，并且希望的钥匙，被送到的是的对话已关闭>对话框，但 SendKeys.Send 被执行的（它的模态，后全部）。你需要让对话框打开第一个，然后发送键，让它关闭。

The problem here is that file.InvokeMember("Click") shows a modal dialog, and you want the keys to be sent to that dialog, but SendKeys.Send gets executed after the dialog has been closed (it's modal, after-all). You need to let the dialog open first, then send the keys and let it close.

此问题可以通过使用的WinForms 定时器来解决，但我用异步/计谋倒是preFER和 Task.Delay 这个（工作code）：

This problem can be solved using WinForms Timer, but I'd prefer using async/await and Task.Delay for this (working code):

async Task PopulateInputFile(HtmlElement file)
{
    file.Focus();

    // delay the execution of SendKey to let the Choose File dialog show up
    var sendKeyTask = Task.Delay(500).ContinueWith((_) =>
    {
        // this gets executed when the dialog is visible
        SendKeys.Send("C:\\Images\\CCPhotoID.jpg" + "{ENTER}");
    }, TaskScheduler.FromCurrentSynchronizationContext());

    file.InvokeMember("Click"); // this shows up the dialog

    await sendKeyTask;

    // delay continuation to let the Choose File dialog hide
    await Task.Delay(500); 
}

async Task Populate()
{
    var elements = webBrowser.Document.GetElementsByTagName("input");
    foreach (HtmlElement file in elements)
    {
        if (file.GetAttribute("name") == "file")
        {
            file.Focus();
            await PopulateInputFile(file);
        }
    }
}

IMO，这种做法是对UI自动化脚本非常方便。您可以拨打填充这样的，例如：

void webBrowser_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
{
    this.webBrowser.DocumentCompleted -= webBrowser_DocumentCompleted;
    Populate().ContinueWith((_) =>
    {
        MessageBox.Show("Form populated!");
    }, TaskScheduler.FromCurrentSynchronizationContext());
}

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