Caliburn.Micro和WebServiceResult

Question

我正在寻找正确的版本类的Caliburn.Micro

公共类WebServiceResult：IResult其中T：新的（）

上面的签名是从的ContactManager例子在完整的Caliburn框架中。 它不会直接剪切并粘贴到微型项目中。有太多的缺失类直接使用它。思考？或任何人知道更换？

Answer 1

虽然Caliburn Micro（基于System.Windows.Interactivity）的底层基础架构有很大不同，但概念几乎相同。

这里是CM版本：

public class WebServiceResult<T, K> : IResult 
    where T : new() 
    where K : EventArgs 
{ 

    readonly static Func<bool> ALWAYS_FALSE_GUARD=() => false; 
    readonly static Func<bool> ALWAYS_TRUE_GUARD =() => true; 

    private readonly Action<K> _callback; 
    private readonly Expression<Action<T>> _serviceCall; 

    private ActionExecutionContext _currentContext; 
    private Func<bool> _originalGuard; 




    public WebServiceResult(Expression<Action<T>> serviceCall) 
    { 
     _serviceCall = serviceCall; 
    } 

    public WebServiceResult(Expression<Action<T>> serviceCall, Action<K> callback) 
    { 
     _serviceCall = serviceCall; 
     _callback = callback; 
    } 

    public event EventHandler<ResultCompletionEventArgs> Completed = delegate { }; 

    public void Execute(ActionExecutionContext context) 
    { 
     _currentContext = context; 

     //if you would to disable the control that caused the service to be called, you could do this: 
     ChangeAvailability(false); 

     var lambda = (LambdaExpression)_serviceCall; 
     var methodCall = (MethodCallExpression)lambda.Body; 
     var eventName = methodCall.Method.Name.Replace("Async", "Completed"); 
     var eventInfo = typeof(T).GetEvent(eventName); 

     var service = new T(); 

     eventInfo.AddEventHandler(service, new EventHandler<K>(OnEvent)); 

     _serviceCall.Compile()(service); 
    } 

    public void OnEvent(object sender, K args) 
    { 
     //re-enable the control that caused the service to be called: 
     ChangeAvailability(true); 

     if (_callback != null) 
      _callback(args); 

     Completed(this, new ResultCompletionEventArgs()); 
    } 



    private void ChangeAvailability(bool isAvailable) 
    { 
     if (_currentContext == null) return; 

     if (!isAvailable) { 
      _originalGuard = _currentContext.CanExecute; 
      _currentContext.CanExecute = ALWAYS_FALSE_GUARD; 
     } 
     else if (_currentContext.CanExecute == ALWAYS_FALSE_GUARD) { 

      _currentContext.CanExecute = _originalGuard ?? ALWAYS_TRUE_GUARD; 
     } 


     _currentContext.Message.UpdateAvailability(); 

    } 


}