c# - Resolve two Async Code Samples -


i need return dictionary<string, byte[]> list of urls.

i have 1 code sample executing asynchronously, returns list<byte[]>, , seems casting object, throwing threading errors.

//seems assign output type correctly, doesn't execute async task<dictionary<string, byte[]>> returnfiledata(ienumerable<string> urls) {     dictionary<uri, task<byte[]>> dictionary;      using (var client = new webclient())     {         dictionary = urls.select(url => new uri(url)).todictionary(             uri => uri, client.downloaddatataskasync);         await task.whenall(dictionary.values);     }      return dictionary.todictionary(pair => path.getfilename(pair.key.tostring()), pair => pair.value.result); }  //executes properly, isn't returning right output type async task<list<byte[]>> returnfiledata2(ienumerable<string> urls) {     dictionary<uri, task<byte[]>> dictionary;     var tasks = urls.select(uri => new webclient().downloaddatataskasync(uri));     var results = await task.whenall(tasks);      return results.select(result => result).tolist(); }

how take returnfiledata2() , fix cast filename of uri alongside returned byte[] in output?

you should stick returnfiledata rework use separate client each url:

async task<dictionary<string, byte[]>> returnfiledata(ienumerable<string> urls) {     dictionary<uri, task<byte[]>> dictionary = urls         .select(url => new uri(url))         .todictionary(uri => uri, getthedataasync);      await task.whenall(dictionary.values);      return dictionary         .todictionary(             pair => path.getfilename(pair.key.tostring()),             pair => pair.value.result); }  async task<byte[]> getthedataasync(uri uri) {     using (var client = new webclient())     {         return await client.downloaddatataskasync(uri);     } }

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