c#webbrowser设置代理ip

#region 设置代理ip
//strProxy为代理IP:端口
private void RefreshIESettings(string strProxy)
{
const int INTERNET_OPTION_PROXY = 38;
const int INTERNET_OPEN_TYPE_PROXY = 3;
const int INTERNET_OPEN_TYPE_DIRECT = 1;

IEProxy.Struct_INTERNET_PROXY_INFO struct_IPI;
// Filling in structure
struct_IPI.dwAccessType = INTERNET_OPEN_TYPE_PROXY;
struct_IPI.proxy = Marshal.StringToHGlobalAnsi(strProxy);
struct_IPI.proxyBypass = Marshal.StringToHGlobalAnsi("local");

// Allocating memory
IntPtr intptrStruct = Marshal.AllocCoTaskMem(Marshal.SizeOf(struct_IPI));
if (string.IsNullOrEmpty(strProxy) || strProxy.Trim().Length == 0)
{
strProxy = string.Empty;
struct_IPI.dwAccessType = INTERNET_OPEN_TYPE_DIRECT;

}
// Converting structure to IntPtr
Marshal.StructureToPtr(struct_IPI, intptrStruct, true);

bool iReturn = InternetSetOption(IntPtr.Zero, INTERNET_OPTION_PROXY, intptrStruct, Marshal.SizeOf(struct_IPI));
}

[DllImport("wininet.dll", SetLastError = true)]
private static extern bool InternetSetOption(IntPtr hInternet, int dwOption, IntPtr lpBuffer, int lpdwBufferLength);
public class IEProxy
{
private const int INTERNET_OPTION_PROXY = 38;
private const int INTERNET_OPEN_TYPE_PROXY = 3;
private const int INTERNET_OPEN_TYPE_DIRECT = 1;

private string ProxyStr;

[DllImport("wininet.dll", SetLastError = true)]

private static extern bool InternetSetOption(IntPtr hInternet, int dwOption, IntPtr lpBuffer, int lpdwBufferLength);

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p;         public struct Struct_INTERNET_PROXY_INFO
{
public int dwAccessType;
public IntPtr proxy;
public IntPtr proxyBypass;
}

private bool InternetSetOption(string strProxy)
{
int bufferLength;
IntPtr intptrStruct;
Struct_INTERNET_PROXY_INFO struct_IPI;

if (string.IsNullOrEmpty(strProxy) || strProxy.Trim().Length == 0)
{
strProxy = string.Empty;
struct_IPI.dwAccessType = INTERNET_OPEN_TYPE_DIRECT;
}
else
{
struct_IPI.dwAccessType = INTERNET_OPEN_TYPE_PROXY;
}
struct_IPI.proxy = Marshal.StringToHGlobalAnsi(strProxy);
struct_IPI.proxyBypass = Marshal.StringToHGlobalAnsi("local");
bufferLength = Marshal.SizeOf(struct_IPI);
intptrStruct = Marshal.AllocCoTaskMem(bufferLength);
Marshal.StructureToPtr(struct_IPI, intptrStruct, true);
return InternetSetOption(IntPtr.Zero, INTERNET_OPTION_PROXY, intptrStruct, bufferLength);

}
public IEProxy(string strProxy)
{
this.ProxyStr = strProxy;
}
//设置代理
public bool RefreshIESettings()
{
return InternetSetOption(this.ProxyStr);
}
//取消代理
public bool DisableIEProxy()
{
return InternetSetOption(string.Empty);
}
}
#endregion

//清空session
public void ResetSession()
{
//Session的选项ID为42
InternetSetOption(IntPtr.Zero, 42, IntPtr.Zero, 0);
}

//清空cookie
public void ResetCookie()
{
if (webBrowser1.Document != null)
{
webBrowser1.Document.Cookie.Remove(0, webBrowser1.Document.Cookie.Count() - 1);

}
string[] theCookies = System.IO.Directory.GetFiles(Environment.GetFolderPath(Environment.SpecialFolder.Cookies));
foreach (string currentFile in theCookies)
{
try
{
System.IO.File.Delete(currentFile);
}
catch (Exception ex)
{
}
}
}