C#中如何让Func可以await

Question

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?)

Answer 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>>