C# Web 浏览器控件下载(无提示 + 证书 SSL + WebForms)

本文关键字：证书 SSL WebForms 提示 浏览器 Web 控件 下载 | 更新日期: 2023-09-27 18:34:27

问题：

  1. 捕获所有 ASP.NET 视图状态回发数据
  2. 在SSLEnabled-WebClient中模拟Web浏览器的会话/Cookie状态
  3. 通过SSLEnabled-WebClient发送WebForm POSTDATA以自动下载文件
  4. 管理文件

挖掘我复杂问题的任何解决方案，终于我找到了解决方案。

C# Web 浏览器控件下载(无提示 + 证书 SSL + WebForms)

  1. 将 MSHTML 引用添加到项目中 c:'windows'system32 or WOW64'mshtml.dll

  2. 使用JQuery.serialize()我可以设法从Top ASP.NET Form中获取FormData。

    2.1 将 Jquery 库附加到您的 Web 浏览器当前页面

    HtmlElement head = webBrowser1.Document.GetElementsByTagName("head")[0];
HtmlElement scriptEl1 = webBrowser1.Document.CreateElement("script");
scriptEl1.SetAttribute("src", "https://code.jquery.com/jquery-1.11.1.min.js");
head.AppendChild(scriptEl1);

    2.2 创建一个新的div HTML 元素，通过脚本接收 postData

    HtmlElement scriptEl2 = webBrowser1.Document.CreateElement("script");
mshtml.IHTMLScriptElement element = (mshtml.IHTMLScriptElement)scriptEl2.DomElement;
element.text = @"
function CreatePostData() { 
     //alert('Jquery online');
     var postData = jQuery(document.forms[0]).serialize();
     var divPost = document.createElement(""DIV"");
     divPost.innerText = postData;
     divPost.id = ""divPost"";
     document.body.appendChild(divPost);
     //alert(divPost.innerText);
}";
head.AppendChild(scriptEl2);
webBrowser1.Document.InvokeScript("CreatePostData");
string postData = webBrowser1.Document.GetElementById("divPost").InnerText;

  3. 拥有PostData后，您现在需要启用WebClient SSLSecure。 

    class SecureWebClient : WebClient
{
    protected override WebRequest GetWebRequest(Uri address)
    {
        HttpWebRequest request = (HttpWebRequest)base.GetWebRequest(address);
        string certPath = @"C:'TEMP'ClientCertificateFile.cer";
        X509Certificate myCert = X509Certificate.CreateFromCertFile(certPath);
        request.ClientCertificates.Add(myCert);
        return request;
    }
}

  4. 现在您必须将相同的WebBrowser状态与WebClient的状态同步，某些网站/系统为此使用HTTPOnly cookie，这就是我的情况。这些 cookie 默认情况下不会在 WebBrowser Document.Cookie 属性中出现，以克服对 

     var cookies = FullWebBrowserCookie.GetCookieInternal(webBrowser1.Url, false);`

    如果您需要如上所述使用 HTTPOnly cookie，请在项目中添加另一个类：

    using System;
using System.ComponentModel;
using System.Net;
using System.Runtime.InteropServices;
using System.Security;
using System.Security.Permissions;
using System.Text;
using System.Windows.Forms;
internal sealed class NativeMethods
{
#region enums
public enum ErrorFlags
{
    ERROR_INSUFFICIENT_BUFFER = 122,
    ERROR_INVALID_PARAMETER = 87,
    ERROR_NO_MORE_ITEMS = 259
}
public enum InternetFlags
{
    INTERNET_COOKIE_HTTPONLY = 8192, //Requires IE 8 or higher   
    INTERNET_COOKIE_THIRD_PARTY = 131072,
    INTERNET_FLAG_RESTRICTED_ZONE = 16
}
#endregion
#region DLL Imports
[SuppressUnmanagedCodeSecurity, SecurityCritical, DllImport("wininet.dll", EntryPoint = "InternetGetCookieExW", CharSet = CharSet.Unicode, SetLastError = true, ExactSpelling = true)]
internal static extern bool InternetGetCookieEx([In] string Url, [In] string cookieName, [Out] StringBuilder cookieData, [In, Out] ref uint pchCookieData, uint flags, IntPtr reserved);
    #endregion
}

/// <SUMMARY></SUMMARY>   
/// WebBrowserCookie?   
/// webBrowser1.Document.CookieHttpOnlyCookie   
///    
public class FullWebBrowserCookie : WebBrowser
{
[SecurityCritical]
public static string GetCookieInternal(Uri uri, bool throwIfNoCookie)
{
    uint pchCookieData = 0;
    string url = UriToString(uri);
    uint flag = (uint)NativeMethods.InternetFlags.INTERNET_COOKIE_HTTPONLY;
    //Gets the size of the string builder   
    if (NativeMethods.InternetGetCookieEx(url, null, null, ref pchCookieData, flag, IntPtr.Zero))
    {
        pchCookieData++;
        StringBuilder cookieData = new StringBuilder((int)pchCookieData);
        //Read the cookie   
        if (NativeMethods.InternetGetCookieEx(url, null, cookieData, ref pchCookieData, flag, IntPtr.Zero))
        {
            DemandWebPermission(uri);
            return cookieData.ToString();
        }
    }
    int lastErrorCode = Marshal.GetLastWin32Error();
    if (throwIfNoCookie || (lastErrorCode != (int)NativeMethods.ErrorFlags.ERROR_NO_MORE_ITEMS))
    {
        throw new Win32Exception(lastErrorCode);
    }
    return null;
}
private static void DemandWebPermission(Uri uri)
{
    string uriString = UriToString(uri);
    if (uri.IsFile)
    {
        string localPath = uri.LocalPath;
        new FileIOPermission(FileIOPermissionAccess.Read, localPath).Demand();
    }
    else
    {
        new WebPermission(NetworkAccess.Connect, uriString).Demand();
    }
}
private static string UriToString(Uri uri)
{
    if (uri == null)
    {
        throw new ArgumentNullException("uri");
    }
    UriComponents components = (uri.IsAbsoluteUri ? UriComponents.AbsoluteUri : UriComponents.SerializationInfoString);
    return new StringBuilder(uri.GetComponents(components, UriFormat.SafeUnescaped), 2083).ToString();
}   }

  5. 将 WebControl 状态与 WebClient 同步，发出 PostData 并捕获返回的 byteArray：

    SecureWebClient wc = new SecureWebClient();
wc.Headers.Add("Cookie: " + cookies);
wc.Headers.Add("Content-Type", "application/x-www-form-urlencoded");
byte[] result = wc.UploadData("<URL>", "POST", System.Text.Encoding.UTF8.GetBytes(postData));
File.WriteAllBytes(@"C:'Temp'<FileName>", result);
wc.Dispose();
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