无法从方法组转换为System.Func< string> [英] Cannot convert from method group to System.Func<string>

问题描述

我正在玩.Net 4.0 Task类，以使用线程在后台下载google网页。问题是，如果我的函数具有1个或多个参数，则应用程序将无法编译（idk如何传递该参数）。因此，我想知道如何在DoWork（）方法中传递函数的参数。

I'm playing a bit with the .Net 4.0 Task class to download the google webpage in background using a thread. The problem is that if my function has 1 or more parameters, the application won't compile (idk how to pass that parameter). So I wonder how can I pass the function's parameter in the DoWork() method.

这可行：

    public Task<String> DoWork() {
        //create task, of which runs our work of a thread pool thread
        return Task.Factory.StartNew<String>(this.DownloadString);

    }


    private String DownloadString()
    {
        using (var wc = new WebClient())
            return wc.DownloadString("http://www.google.com");
    }

这不是：

    public Task<String> DoWork() {
        //create task, of which runs our work of a thread pool thread
        return Task.Factory.StartNew<String>(this.DownloadString);

    }


    private String DownloadString(String uri)
    {
        using (var wc = new WebClient())
            return wc.DownloadString(uri);
    }

错误是：

cannot convert from 'method group' to 'System.Func<string>'

谢谢！

推荐答案

return Task.Factory.StartNew(() => this.DownloadString("http://...."));

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