Делаешь хэндлер
| Код |
/// <summary>
/// Summary description for $codebehindclassname$
/// </summary>
[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
public class GismeteoHandler : IHttpHandler
{
[DllImport("advapi32.dll")]
public static extern bool LogonUser(string lpszUserName, string lpszDomain, string lpszPassword, int dwLogonType,
int dwLogonProvider, out int phToken);
private byte[] ImageContent
{
get
{
return HttpContext.Current.Cache["GisMeteoWeatherImage"] as byte[];
}
set
{
HttpContext.Current.Cache.Add("GisMeteoWeatherImage", value, null, DateTime.Now.AddMinutes(15.0),
Cache.NoSlidingExpiration, CacheItemPriority.Low, null);
}
}
public void ProcessRequest(HttpContext context)
{
if (ImageContent == null)
{
ReadWeatherImageContent();
}
context.Response.AddHeader("Content-Length", ImageContent.Length.ToString());
context.Response.ContentType = "image/gif";
context.Response.BinaryWrite(ImageContent);
}
private void ReadWeatherImageContent()
{
// данные аккаунта с доступом в инет лучше хранить зашифрованными в web.config
string weatherUserId = "";
string weatherUserDomain = "";
string weatherUserPassword = "";
int returnedToken;
if (LogonUser(weatherUserId, weatherUserDomain, weatherUserPassword, 3, 0, out returnedToken))
{
IntPtr token = new IntPtr(returnedToken);
WindowsImpersonationContext impersonationContext = WindowsIdentity.Impersonate(token);
try
{
var request = (HttpWebRequest)WebRequest.Create("http://informer.gismeteo.ru/new/4944-30.GIF");
var response = (HttpWebResponse)request.GetResponse();
using (StreamReader stream = new StreamReader(response.GetResponseStream(), Encoding.GetEncoding(1251)))
{
ImageContent = Encoding.GetEncoding(1251).GetBytes(stream.ReadToEnd());
}
}
finally
{
impersonationContext.Undo();
}
}
}
public bool IsReusable
{
get
{
return false;
}
}
}
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на странице:
| Код |
<asp:Image runat="server" ImageUrl="~/AppCode/GismeteoHandler.ashx" />
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