Html .Net WebBrowser.DocumentText 没有改变！
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.Net WebBrowser.DocumentText Isn't Changing!
提问by Joe Morgan
In my vb.net program, I am using a webbrowser to show the user an HTML preview. I was previously hitting a server to grab the HTML, then returning on an asynchronous thread and raising an event to populate the WebBrowser.DocumentText with the HTML string I was returning.
在我的 vb.net 程序中，我使用网络浏览器向用户显示 HTML 预览。我以前访问服务器以获取 HTML，然后在异步线程上返回并引发事件以使用我返回的 HTML 字符串填充 WebBrowser.DocumentText。
Now I set it up to grab all of the information on the client, without ever having to hit the server, and I'm trying to raise the same event. I watch the code go through, and it has the HTML string correct and everything, but when I try to do
现在我将它设置为获取客户端上的所有信息，而不必访问服务器，并且我正在尝试引发相同的事件。我看着代码通过，它有正确的 HTML 字符串和一切，但是当我尝试做
browser.DocumentText = _emailHTML
the contents of DocumentText remain as "<HTML></HTML>"
DocumentText 的内容保持为“ <HTML></HTML>”
I was just wondering why the DocumentText was not being set. Anyone have any suggestions?
我只是想知道为什么没有设置 DocumentText。有人有什么建议吗？
回答by David Mohundro
Try the following:
请尝试以下操作：
browser.Navigate("about:blank");
HtmlDocument doc = browser.Document;
doc.Write(String.Empty);
browser.DocumentText = _emailHTML;
I've found that the WebBrowsercontrol usually needs to be initialized to about:blankanyway. The same needs to be done between navigates to different types of content (like text/xml to text/html) because the renderer is different (mshtml for text/html, something else for text/xml).
我发现WebBrowser控件通常需要初始化为about:blank无论如何。在导航到不同类型的内容（例如 text/xml 到 text/html）之间需要做同样的事情，因为渲染器是不同的（对于 text/html 是 mshtml，对于 text/xml 是别的）。
(via http://geekswithblogs.net/paulwhitblog/archive/2005/12/12/62961.aspx)
（通过http://geekswithblogs.net/paulwhitblog/archive/2005/12/12/62961.aspx）
回答by Matthias
I found the following and it worked!
我发现了以下内容并且它起作用了！
webBrowser.Navigate("about:blank");
webBrowser.Document.OpenNew(false);
webBrowser.Document.Write(html);
webBrowser.Refresh();
回答by FreddieH
I found the best way to handle this, is as follows:
我发现处理这个问题的最佳方法如下：
if (this.webBrowser1.Document == null)
{
this.webBrowser1.DocumentText = htmlSource;
}
else
{
this.webBrowser1.Document.OpenNew(true);
this.webBrowser1.Document.Write(htmlSource);
}
回答by Interferank
That worked for me:
这对我有用：
webBrowser.Navigate("about:blank");
webBrowser.Document?.Write(htmlString);
回答by johnc
Just spotted this in some of our old code.
刚刚在我们的一些旧代码中发现了这一点。
_webBrowser.DocumentText = builder.WriteToString( ... );
Application.DoEvents();
Apparently a DoEvents also kicks the browser into rendering
显然，DoEvents 也会让浏览器进入渲染状态
回答by JOE SKEET
please refer to this answer c# filenotfoundexception on webbrowser?
回答by AVIDeveloper
While Application.DoEvents()fix it in a WinForms project, it was irrelevant in a WPF project.
虽然Application.DoEvents()在 WinForms 项目中修复它，但它在 WPF 项目中无关紧要。
I finally got it to work by using webBrowser.Write( htmlContent )(instead of webBrowser.DocumentText = htmlContent).
我终于通过使用webBrowser.Write( htmlContent )（而不是webBrowser.DocumentText = htmlContent）让它工作了。
回答by Prads
This always works
这总是有效
using mshtml;
private IHTMLDocument2 Document
{
get
{
if (Browser.Document != null)
{
return Browser.Document.DomDocument as IHTMLDocument2;
}
return null;
}
}
if (Document == null)
{
Browser.DocumentText = Contents;
}
else
{
Document.body.innerHTML = Contents;
}
回答by antgraf
Make sure that you do not cancel Navigatingevent of WebBrowserfor about:blankpage. WebBrowsernavigates to about:blankbefore setting DocumentText. So if you want to handle links by yourself you need to create following handler of Navigatingevent:
请确保您没有取消WebBrowser的about:blank页面导航事件。WebBrowser在设置DocumentText之前导航到about:blank。因此，如果您想自己处理链接，则需要创建以下Navigating事件处理程序：
private void webBrowser1_Navigating(object sender, WebBrowserNavigatingEventArgs e)
{
if(e.Url.OriginalString.StartsWith("about:"))
{
return;
}
e.Cancel = true;
// ...
}
