.NET 4.0中.NET 4.5中的Task.FromResult()的等效项 [英] Equivalent of Task.FromResult() from .NET 4.5 in .NET 4.0
问题描述
我找不到有关将代码从.NET 4.5重定向到4.0的信息。我必须在Windows XP上安装此应用程序。
I cant find information about retargeting my code from .NET 4.5 to 4.0. I have to install this application on Windows XP.
我在.NET 4.5中的代码
my code in .NET 4.5
public async Task <IXLWorksheet> ImportFile(string fileToImport)
{
...
return await Task.FromResult<IXLWorksheet>(Sheet1)
}
.NET 4.0中的FromResult不存在。
有人知道它在.NET 4.0中的外观吗?
In .NET 4.0 method FromResult does not exist. Someone knows how it should looks in .NET 4.0??
推荐答案
您将返回a的等待结果任务,它基于结果。解决方案非常简单-删除 await
:
You're returning the awaited result of a task, which is constructed on a result. The solution is rather simple - drop the await
:
return Sheet1;
方法声明中的 async
关键字将
如果由于某种原因需要在完成的任务中手动包装现有值,则可以使用 TaskCompletionSource
-比 Task.FromResult
有点笨,但有一点。
If, for some reason, you need to manually wrap an existing value in a completed task, you can use TaskCompletionSource
- it's a bit clunkier than Task.FromResult
, but just a bit.
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