如何使用 AsyncLazy 调用非静态方法

Question

DoStuffOnlyOnceAsync我必须尝试调用 using的非静态方法AsyncLazy，但出现错误。

如何调用非静态方法？

字段初始值设定项不能引用非静态字段、方法或属性“TestClass.DoStuffOnlyOnceAsync()”

 using System;

 using System.Runtime.CompilerServices;

 using System.Threading.Tasks;

 namespace Registry

{

public class AsyncLazy<T> : Lazy<Task<T>>

{

    public AsyncLazy(Func<T> valueFactory) : base(() => Task.Run(valueFactory)) { }

    public AsyncLazy(Func<Task<T>> taskFactory) : base(() => Task.Run(() => taskFactory())) { }

    public TaskAwaiter<T> GetAwaiter() { return Value.GetAwaiter(); }

}

public class TestClass

{

    private AsyncLazy<bool> asyncLazy = new AsyncLazy<bool>(async () =>

    {

        await DoStuffOnlyOnceAsync();

        return true;

    });

    public TestClass() { }

    public async Task DoStuffOnlyOnceAsync()

    {

        await Task.FromResult(false);

    }

}

}

Answer 1

限制是字段初始值设定项不能调用任何非静态方法。AsyncLazy<T>对于任何字段初始值设定项都是如此，与or无关async。要修复它，请在构造函数中初始化该字段：public TestClass(){&nbsp; asyncLazy = new AsyncLazy<bool>(async () =>&nbsp; {&nbsp; &nbsp; await DoStuffOnlyOnceAsync();&nbsp; &nbsp; return true;&nbsp; });}