C#中如何让Func可以await
0
悬赏园豆：50
[已解决问题]
解决于 2018-03-05 14:25
下面的 C# 代码
public async Task<T> GetValueOrCreateAsync<T>(string key, Func<T> factory)
{
//..
var value = await factory();
}编译时会报错
CS1061 'Func<T>' does not contain a definition for 'GetAwaiter' and no extension method 'GetAwaiter' accepting a first argument of type 'Func<T>' could be found (are you missing a using directive or an assembly reference?)
最佳答案
1
public async Task<T> GetValueOrCreateAsync<T>(string key, Func<Task<T>> factory)
{
//..
var value = await factory();
return default(T);
}Func<T> - > Func<Task<T>>
收获园豆：30
其他回答(2)
0
public static class FuncExtensions
{
public static TaskAwaiter<TResult> GetAwaiter<TResult>(this Func<TResult> function)
{
Task<TResult> task = new Task<TResult>(function);
task.Start();
return task.GetAwaiter();
}
}
收获园豆：10
0
return Task<T>.Run(func);
收获园豆：10
