Question

WebClient DownloadFileAsync（）无法使用相同的URl和凭据...

有任何线索吗？

 static void Main(string[] args)
        {
            try
            {
                var urlAddress = "http://mywebsite.com/msexceldoc.xlsx";


                using (var client = new WebClient())
                {
                    client.Credentials = new NetworkCredential("UserName", "Password");
                    // It works fine.  
                    client.DownloadFile(urlAddress, @"D:\1.xlsx");
                }

                /*using (var client = new WebClient())
                {
                   client.Credentials = new NetworkCredential("UserName", "Password");

                    // It y creats file with 0 bytes. Dunow why is it. 
                    client.DownloadFileAsync(new Uri(urlAddress), @"D:\1.xlsx");
                    //client.DownloadFileCompleted += new AsyncCompletedEventHandler(Completed);

                }*/
            }
            catch (Exception ex)
            {

            }
        }

Answer 1

您需要在异步下载完成时保持程序运行，因为它在另一个线程中运行。

尝试这样的事情，并等到它说完，然后再按Enter键结束程序：

static void Main(string[] args)
    {
        try
        {
            var urlAddress = "http://mywebsite.com/msexceldoc.xlsx";

            using (var client = new WebClient())
            {
               client.Credentials = new NetworkCredential("UserName", "Password");

                client.DownloadFileAsync(new Uri(urlAddress), @"D:\1.xlsx");
                client.DownloadFileCompleted += new AsyncCompletedEventHandler(Completed);
        }
        catch (Exception ex)
        {

        }

    Console.ReadLine();
    }

public static void Completed(object o, AsyncCompletedEventArgs args)
{
    Console.WriteLine("Completed");
}

根据您使用此类型的应用程序，主线程需要在后台线程下载文件时继续运行。

Answer 2

通过将主要功能声明为angular.module('MyApp',['ngMaterial', 'ngMessages']) .controller('AppCtrl', function($scope) { $scope.currentCard = { redAlert: true }; $scope.toggle = function () { $scope.currentCard.redAlert = !$scope.currentCard.redAlert; } });，您还可以将async与DownloadFileTaskAsync一起使用。

await

WebClient DownloadFileAsync（）不起作用

2 个答案: