wpf 无法从方法组转换为 System.Func<string>
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/29376665/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
Cannot convert from method group to System.Func<string>
提问by Daniel Pascal
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.
我正在使用 .Net 4.0 Task 类在后台使用线程下载谷歌网页。问题是，如果我的函数有 1 个或多个参数，应用程序将无法编译（不知道如何传递该参数）。所以我想知道如何在 DoWork() 方法中传递函数的参数。
This works:
这有效：
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");
}
This doesn't:
这不会：
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);
}
The error is:
错误是：
cannot convert from 'method group' to 'System.Func<string>'
Thank you in advance!
先感谢您！
回答by puko
return Task.Factory.StartNew(() => DownloadString("https://www.google.com"));
or
或者
return Task.Factory.StartNew(() =>
{
using (var wc = new WebClient())
return wc.DownloadString("https://www.google.com");
});
回答by EZI
return Task.Factory.StartNew(() => this.DownloadString("http://...."));
