太多的论点为的BeginXXX FromAsync？ [英] Too many arguments in BeginXXX for FromAsync?

问题描述

我有一个异步方法具有以下签名：

I have an async method with the following signature:

IAsyncResult BeginGetMyNumber(string foo, string bar, string bat, int bam, AsyncCallback callback, object state)

我想用Factory.FromAsync这样执行它：

I want to execute it using Factory.FromAsync like this:

var result  = Task<int>.Factory.FromAsync(
                instance.BeginGetMyNumber, 
                instance.EndGetMyNumber, 
                "foo",
                "bar",
                "bat",
                100, /*bam*/
                null);

但我得到以下错误：

but I get the following error:

参数1：无法从方法组转换
  System.Func

Argument 1: cannot convert from 'method group' to 'System.Func'

似乎没有合适的重载FromAsync方法<一href=\"http://msdn.microsoft.com/en-us/library/system.threading.tasks.taskfactory.fromasync.aspx\">http://msdn.microsoft.com/en-us/library/system.threading.tasks.taskfactory.fromasync.aspx,它最多只支持5个参数（包括回调状态）上的BeginXXX方法。

It seems there is no suitable overloaded FromAsync method http://msdn.microsoft.com/en-us/library/system.threading.tasks.taskfactory.fromasync.aspx, it only supports up to 5 arguments (including callback and state) on the BeginXXX method.

除了重构的BeginXXX方法取一个对象，而不是六个参数，有没有使用FromAsync执行它的方式？

Other than refactoring the BeginXXX method to take an object rather than six arguments, is there a way to execute it using FromAsync?

推荐答案

其实我似乎可以使用Factory.FromAsync重载方法（即需要一个IAsyncResult对象作为第一个参数和一个回调方法作为第二：

Actually it seems I can use the overloaded method for Factory.FromAsync( that takes an IAsyncResult object as the first argument and a callback method as the second:

result = Task<string>.Factory.FromAsync(
                instance.BeginGetMyNumber("foo", "bar", "bat", 1, null, null),
                instance.EndGetMyNumber);

这篇关于太多的论点为的BeginXXX FromAsync？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！