Xamarin : How to call API POST method

Xamarin : API call

How to consume API method in xamarin application ? 

I tried on google but couldn't find proper example. I got help of my friend who have knowledge of xamarin and some help from google, and created successful demo, which I am sharing with you.

Steps:

1. First check that API is working or not
2. Install "newtonsoft json" from NuGet package manager

Design 

<Grid>

    <Grid.RowDefinitions>

      <RowDefinition Height="50"></RowDefinition>

      <RowDefinition Height="50"></RowDefinition>

      <RowDefinition Height="*"></RowDefinition>

    </Grid.RowDefinitions>

    <Grid.ColumnDefinitions>

      <ColumnDefinition Width="*"></ColumnDefinition>      

    </Grid.ColumnDefinitions>

    <Button Text="Get Data"

            Clicked="OnGetDataButtonClicked"

            Grid.Row="0"

            Grid.Column="0"></Button>

    <Label x:Name="lblMsg"

           Grid.Row="1"

           Grid.Column="0"></Label>

    <ListView x:Name="MainList"  ItemTapped="OnTapped" Grid.Row="2" Grid.Column="0"> 

      <ListView.ItemTemplate>

        <DataTemplate>

          <ViewCell>

            <StackLayout Orientation="Horizontal">

              <Label Text="{Binding EmailId}"></Label> 

            </StackLayout>

          </ViewCell>

        </DataTemplate>

      </ListView.ItemTemplate>

    </ListView>

    

  </Grid>

Code

async void OnGetDataButtonClicked(object sender, EventArgs e)

        {

            try

            {

                HttpClient client = new HttpClient();

                string requestPayload = @"{

""UserId"": ""123"",

""dataTableCommon"":{

""param"" :{""Start"": ""21"",

""Length"": ""10"",

""Draw"" :""1""}

}

}";

                var response = await client.PostAsync("http://Domainname/DemoAPI/API/User/GetUsersList", 

new StringContent(requestPayload, Encoding.UTF8, "application/json"));

                if (response.StatusCode == HttpStatusCode.OK)

                {

                    var json = await response.Content.ReadAsStringAsync();

   

                    //Here you need to create class for output results

    // To generate class, you can use http://json2csharp.com

                    var results = JsonConvert.DeserializeObject<RootObject>(json);

                    MainList.ItemsSource = results.data;                    

                }

            }

            catch (Exception ex)

            {

                lblMsg.Text = ex.Message;

            }            

        }

        void OnTapped(object sender, ItemTappedEventArgs e)

        {

            var selected = e.Item as Users;

            DisplayAlert("Name", selected.FirstName + " " + selected.LastName, "Okay");

        }

Generate Class

    // To generate class, you can use http://json2csharp.com

    

    public class Users

    {

        public string UserId { get; set; }    

        public string FirstName { get; set; }

        public string LastName { get; set; }

        public string EmailId { get; set; }

    }

    public class RootObject

    {        

        public List<Users> data { get; set; } 

    }

Output

I hope, you like the article !!! ENJOY !!!