Return arrays to itemsource??? I need help

Question

HI,

public async System.Threading.Task<string[]> Loading(string id)
{
...
  var srtHtml = await httpClient.GetStringAsync("???");
...
 foreach (var node in senseblock)
                    {

                        Dictionaries = new Models.EnglishDictionary();
                        var def = node.Descendants("span").FirstOrDefault(x => x.GetAttributeValue("class", "") == "def");
                        var examp = node.Descendants("span").FirstOrDefault(x => x.GetAttributeValue("class", "") == "def-body");
                        //Dictionaries.Symbol = "/Photos/glasses-50.png";

                        if (def != null)
                        {
                            Dictionaries.Description = def.InnerText.Trim();
                        }
                        if (examp != null)
                        {
                            Dictionaries.Examp = examp.InnerText.Trim();
                        }
                        arrays.Add(Dictionaries);
...
    
}

 

 private string _description;
        public string Description
        {
            get
            {
                return _description;
            }
            set
            {
               _description=value.Replace("\n","");
            }
        }

"listview.itemsource=loading("1")" in MainPage_Load is show error out. How to get it when object's "async" type. My english is bad so I'm sorry I can't explain clearly by english. 

Answer 1

You must await the Loading method since its return type is Task<string[]> and not string[]:

async void MainPage_Loaded(object sender, RoutedEventArgs e)
        {
            listview.ItemsSource = await Loading("1");
        }

Please remember to mark all helpful posts as answer to close your threads and then start a new thread if you have a new question. Please don't ask several questions in the same thread.

Answer 2

In 

public async System.Threading.Task<Models.MainModels> Loading(string id)
{
List<Models.MainModels> arrays = new List<Models.MainModels>();
await....
...
arrays.Add(t);
...
what to return???
}

Return arrays it show error out.

Answer 3

Since the return type of the method is  System.Threading.Task<Models.MainModels> you must return a single Models.MainModels object:

return arrays[0];

If you want to return a List<Models.MainModels> you should change the return type of the method to System.Threading.Task<List<Models.MainModels>>:

public async System.Threading.Task<List<Models.MainModels>> Loading(string id)
{
List<Models.MainModels> arrays = new List<Models.MainModels>();
...
return arrays;
}

Please remember to mark all helpful posts as answer and please start a new thread for each new question you may have. Please don't ask several questions in the same thread.

 

Answer 4

I got the error:system.threading.tasks can not be used with argument at 

System.Threading.Task<List<Models.MainModels>>