假设System.Windows.Forms.WebBrowswer使用与您想要下载受保护的链接访问受保护的页面:
此代码检索实际的链接你想利用网络来下载浏览器。 此代码将需要为您的特定操作进行更改。重要的部分是这个字段documentLinkUrl
,将在下面使用。
var documentLinkUrl = default(Uri);
browser.DocumentCompleted += (object sender, WebBrowserDocumentCompletedEventArgs e) =>
{
var aspForm = browser.Document.Forms[0];
var downloadLink = browser.Document.ActiveElement
.GetElementsByTagName("a").OfType<HtmlElement>()
.Where(atag =>
atag.GetAttribute("href").Contains("DownloadAttachment.aspx"))
.First();
var documentLinkString = downloadLink.GetAttribute("href");
documentLinkUrl = new Uri(documentLinkString);
}
browser.Navigate(yourProtectedPage);
现在,受保护的页面已经被Web浏览器导航到和下载链接已被收购,此代码下载链接。
private static async Task DownloadLinkAsync(Uri documentLinkUrl)
{
var cookieString = GetGlobalCookies(documentLinkUrl.AbsoluteUri);
var cookieContainer = new CookieContainer();
using (var handler = new HttpClientHandler() { CookieContainer = cookieContainer })
using (var client = new HttpClient(handler) { BaseAddress = documentLinkUrl })
{
cookieContainer.SetCookies(this.documentLinkUrl, cookieString);
var response = await client.GetAsync(documentLinkUrl);
if (response.IsSuccessStatusCode)
{
var responseAsString = await response.Content.ReadAsStreamAsync();
// Response can be saved from Stream
}
}
}
上面的代码依赖于从埃里卡Chinchio的GetGlobalCookies
方法可以通过@Pedro莱昂纳多(可here)提供了出色的文章中找到,
[System.Runtime.InteropServices.DllImport("wininet.dll", CharSet = System.Runtime.InteropServices.CharSet.Auto, SetLastError = true)]
static extern bool InternetGetCookieEx(string pchURL, string pchCookieName,
System.Text.StringBuilder pchCookieData, ref uint pcchCookieData, int dwFlags, IntPtr lpReserved);
const int INTERNET_COOKIE_HTTPONLY = 0x00002000;
private string GetGlobalCookies(string uri)
{
uint uiDataSize = 2048;
var sbCookieData = new System.Text.StringBuilder((int)uiDataSize);
if (InternetGetCookieEx(uri, null, sbCookieData, ref uiDataSize,
INTERNET_COOKIE_HTTPONLY, IntPtr.Zero)
&&
sbCookieData.Length > 0)
{
return sbCookieData.ToString().Replace(";", ",");
}
return null;
}
你有一个解决方案,你最后问题,如何在动态生成文件时下载文件,并且您无法确定它是否是从网址下载的文件? – 2011-05-06 07:07:54