System.Keywords" content="CompletedTask 方法" /><meta name="System.Keywords" content="TaskExtension.CompletedTask 方法" /><meta name="Microsoft.Help.F1" content="System.Threading.Tasks.TaskExtension.CompletedTask" /><meta name="Microsoft.Help.Id" content="M:System.Threading.Tasks.TaskExtension.CompletedTask" /><meta name="Description" content="使 Task.Completed 兼容 .NET 4.5 的方法" /><meta name="Microsoft.Help.ContentType" content="Reference" /><meta name="BrandingAware" content="true" /><meta na