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Backend For FrontEnd API for Xamarin Apps
using System.Threading.Tasks;
using PropertyChanged;
/// <summary>
/// See "Consuming the BFF API" in http://vincenth.net/blog/archive/2016/07/13/building-bff-backend-for-frontend-apis-for-xamarin-mobile-apps.aspx
/// </summary>
namespace MyApp.ApiModels
{
[ImplementPropertyChanged] // This will make all properties in all partial Contact classes data-bindable
public partial class Contact : ViewModelBase
{
public RelayCommand SaveCommand { get; private set; }
async private Task Save() { } // Implement save...
}
public abstract class ViewModelBase { } // E.g. implement INotifyPropertyChanged if you want something other than the Fody generated default ...
public class RelayCommand { } // Implement ICommand ...
}
using System;
using Newtonsoft.Json;
/// <summary>
/// See "BFF API Design Artifacts" in http://vincenth.net/blog/archive/2016/07/13/building-bff-backend-for-frontend-apis-for-xamarin-mobile-apps.aspx
/// </summary>
namespace MyApp.ApiModels
{
[JsonObject(MemberSerialization = MemberSerialization.OptIn)] // When we extend this class to a viewmodel in the client, we do not want to serialize all additional properties (e.g. commands)
public partial class Contact
{
[JsonProperty]
public Guid Id { get; set; }
[JsonProperty]
public string Name { get; set; }
// More properties ...
}
// More API model classes ...
}
namespace MyApp.Api
{
using ApiModels;
public class ApiDesignData : IApi
{
public ApiResult<Contact> GetContact(Guid contactId)
{
return ApiResult<Contact>.FromValue(new Contact
{
Id = new Guid("54AEB38C-0820-4BAA-B27B-054CEE4F1199"),
Name = "Hubert Wolfeschlegelsteinhausenbergerdorff"
});
}
public ApiResult SaveContact(Contact contact)
{
return new ApiResult();
}
}
public interface IApi
{
ApiResult<Contact> GetContact(Guid contactId);
ApiResult SaveContact(Contact contact);
// More API methods ...
}
public class ApiResult
{
public string Error { get; protected set; }
public ApiResult(string error = null) { Error = error; }
}
public class ApiResult<T> : ApiResult
{
public T Value { get; private set; }
public static ApiResult<T> FromValue(T value) { return new ApiResult<T> { Value = value }; }
public static ApiResult<T> FromError(string error) { return new ApiResult<T> { Error = error }; }
}
}
[ImplementPropertyChanged]
public class Person
{
public string GivenNames { get; set; }
public string FamilyName { get; set; }
public string FullName { get { return string.Format("{0} {1}", GivenNames, FamilyName); } }
// PropertyChanged will automatically be raised for FullName whenever GivenNames or FamilyName change
}
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