Yakup KALEBAŞI

try
{
    IncomingWebRequestContext request = WebOperationContext.Current.IncomingRequest;
    WebHeaderCollection headers = request.Headers;
    foreach (string headerName in headers.AllKeys)
    {
        if (headerName != "X-Forwarded-For") { continue; }
        return headers[headerName];
    }
}
catch (Exception)
{
}