xamarin.forms-restful.cs

public class RestService : IRestService
{
  HttpClient client;
  ...

  public RestService ()
  {
    client = new HttpClient (); // Creating the HTTPClient Object
  }
  
  public async Task<List<TodoItem>> RefreshDataAsync ()
  {
    ...
    var uri = new Uri (string.Format (Constants.RestUrl, string.Empty));
    ...
    var response = await client.GetAsync (uri); // Retrieving Data
    if (response.IsSuccessStatusCode) {
        var content = await response.Content.ReadAsStringAsync ();
        Items = JsonConvert.DeserializeObject <List<TodoItem>> (content);
    }
    ...
  }
  
  public async Task SaveTodoItemAsync (TodoItem item, bool isNewItem = false)
  {
    var uri = new Uri (string.Format (Constants.RestUrl, string.Empty));
    ...
    var json = JsonConvert.SerializeObject (item);
    var content = new StringContent (json, Encoding.UTF8, "application/json");

    HttpResponseMessage response = null;
    if (isNewItem) {
      response = await client.PostAsync (uri, content); // Creating Data
    }
    ...

    if (response.IsSuccessStatusCode) {
      Debug.WriteLine (@"TodoItem successfully saved.");
    }
    ...
  }
  
  public async Task SaveTodoItemAsync (TodoItem item, bool isNewItem = false)
  {
    ...
    response = await client.PutAsync (uri, content); // Updating Data
    ...
  }
  
  public async Task DeleteTodoItemAsync (string id)
  {
    var uri = new Uri (string.Format (Constants.RestUrl, id));
    ...
    var response = await client.DeleteAsync (uri); // Deleting Data
    if (response.IsSuccessStatusCode) {
      Debug.WriteLine (@"TodoItem successfully deleted.");
    }
    ...
  }
}