Code Snippets - Nov 2012 Edition

Proxy service for downloading and serving image: (.NET 4.0)

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[HttpGet] public async Task<FileResult> GetImage(string url) {  var _client = new HttpClient();                var imageData = await _client.GetStreamAsync(url);    return new FileStreamResult(imageData, "image/jpeg"); }

Async Http Post (.NET 4.0)

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public Task<string> PostData(string uri, string postData) {  byte[] postBytes = Encoding.ASCII.GetBytes(postData);    HttpWebRequest request = (HttpWebRequest)WebRequest.Create(uri);  request.ContentType = "application/json";  request.Method = WebRequestMethods.Http.Post;  request.ContentLength = postBytes.Length;  request.Timeout = 20000;  request.KeepAlive = false;     var requestStream = request.GetRequestStream();  requestStream.Write(postBytes, 0, postBytes.Length);  requestStream.Close();    Task<WebResponse> task = Task.Factory.FromAsync(   request.BeginGetResponse,   asyncResult => request.EndGetResponse(asyncResult),   (object)null);    return task.ContinueWith(t => ReadStreamFromResponse(t.Result)); }   private static string ReadStreamFromResponse(WebResponse response) {  using (var responseStream = response.GetResponseStream())  {   using (var sr = new StreamReader(responseStream))   {    return sr.ReadToEnd();   }  } }

Group and Count in LINQ

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public class Asset {  public string KnownColorName { get; set; }        }   var assets = GetListOfAssetsFromDatasource();   var colorGroup = assets.                 GroupBy(n => n.KnownColorName)                 .Select(n => new { Count = n.Count(), Color = n.Key })                 .OrderBy(n => n.Color);