如何将任务存储在字典中以便以后在C＃中执行

Question

I'm trying to store a Task in a dictionary for later execution with no success:

Dictionary<string, Task<object>> router = new Dictionary<string, Task<object>();
router["xyz"] = functionToLaterExec

async Task<string> functionToLaterExec()
{
    return await Task.FromResult("Success!");
} 

If I declare the function as

string functionToExec()

Then I can do:

router["xyz"] = new Task<string>(functionToExec);

But I need the function to be async. And don't know how to invoke it. I've tryed:

var t = router["xyz"];
var data = Encoding.UTF8.GetBytes(await t);

with no success.

Thanks.

Answer 1

如果您希望以后能够启动异步操作，那么就不想存储Task ，则需要存储Func<Task> （或者，对于您来说，是Func<Task<string>> ，这样，当您要开始操作时，可以调用该函数，并生成一个代表其完成的Task 。