Using the Entity Framework in N-Tier Applications - Entity Framework 6 Recipes - page 297

program.CreateOrder();
// do not proceed until order is added
await program.PostOrderAsync();
program.ChangeOrder();
// do not proceed until order is changed
await program.PutOrderAsync();
// do not proceed until order is removed
await program.RemoveOrderAsync();
}
private void ServiceSetup()
{
// map URL for Web API cal
_client = new HttpClient { BaseAddress = new Uri(" http://localhost:3237/ ") };
// add Accept Header to request Web API content
// negotiation to return resource in JSON format
_client.DefaultRequestHeaders.Accept.
Add(new MediaTypeWithQualityHeaderValue("application/json"));
}
private void CreateOrder()
{
// Create new order
_order = new Order { Product = "Camping Tent", Quantity = 3, Status = "Received" };
}
private async Task PostOrderAsync()
{
// leverage Web API client side API to call service
var response = await _client.PostAsJsonAsync("api/order", _order);
Uri newOrderUri;
if (response.IsSuccessStatusCode)
{
// Capture Uri of new resource
newOrderUri = response.Headers.Location;
// capture newly-created order returned from service,
// which will now include the database-generated Id value
_order = await response.Content.ReadAsAsync<Order>();
Console.WriteLine("Successfully created order. Here is URL to new resource: {0}", newOrderUri);
}
else
Console.WriteLine("{0} ({1})", (int)response.StatusCode, response.ReasonPhrase);
}
private void ChangeOrder()
{
// update order
_order.Quantity = 10;
}