异步等待，或只是任务<T>

于是，我问我，什么2码的区别：

public class ServiceTest 
{ 
    public Task<List<Widget>> WidgetsAsync(CancellationToken cancellationToken = default(CancellationToken)) 
    { 
     var widgetService = new WidgetService(); 
     return widgetService.GetWidgetsAsync(cancellationToken); 
    } 

    public Task<List<Product>> ProductAsync(CancellationToken cancellationToken = default(CancellationToken)) 
    { 
     var prodService = new ProductService(); 
     return prodService.GetProductsAsync(cancellationToken); 
    } 

    public Task<List<Gizmo>> GizmoAsync(CancellationToken cancellationToken = default(CancellationToken)) 
    { 
     var gizmoService = new GizmoService(); 
     return gizmoService.GetGizmosAsync(cancellationToken); 
    } 
}

和

public class ServiceTest 
{ 
    public async Task<List<Widget>> WidgetsAsync(CancellationToken cancellationToken = default(CancellationToken)) 
    { 
     var widgetService = new WidgetService(); 
     return await widgetService.GetWidgetsAsync(cancellationToken); 
    } 

    public async Task<List<Product>> ProductAsync(CancellationToken cancellationToken = default(CancellationToken)) 
    { 
     var prodService = new ProductService(); 
     return await prodService.GetProductsAsync(cancellationToken); 
    } 

    public async Task<List<Gizmo>> GizmoAsync(CancellationToken cancellationToken = default(CancellationToken)) 
    { 
     var gizmoService = new GizmoService(); 
     return await gizmoService.GetGizmosAsync(cancellationToken); 
    } 
}

消逝时间是完全一样的我.. 我开始与异步，所以也许这是一个愚蠢的问题，但我想确定之前采取一个不好的方向:)

来源

2013-10-23 Olivier Albertini