使用Xamarin下载文件 [英] Download file with Xamarin

问题描述

我正在尝试使用Xamarin下载文件，但收到错误消息:

I'm trying to download file with Xamarin, but receive an error massage:

在WebClient请求期间发生异常.我认为问题出在非授权化上，但我尝试为多个Web下载imagen，并且遇到相同的问题.

An exception occurred during a WebClient request. I thing that the problem is with unhautorization, but I try to download imagen for multiple web, and have the same problem.

代码:

public void getFile() {

    var pathToNewFolder = Android.OS.Environment.ExternalStorageDirectory.AbsolutePath + "/CodeScanner";
    Directory.CreateDirectory(pathToNewFolder);

    try
    {                
        WebClient webClient = new WebClient();
        webClient.DownloadFileCompleted += new AsyncCompletedEventHandler(Completed);               
        var folder = Android.OS.Environment.ExternalStorageDirectory.AbsolutePath + "/CodeScanner";
        webClient.DownloadFileAsync(new Uri("http://www.dada-data.net/uploads/image/hausmann_abcd.jpg"), folder);
    }
    catch (Exception ex)
    {
        Console.WriteLine("ERROR:"+ ex.Message);
    }            
}


private void Completed(object sender, AsyncCompletedEventArgs e)
{
    Console.WriteLine("ERROR: "+ e.Error.Message);
} 

错误消息出现在 Completed 方法的 Console.WriteLine(中.首先，我创建了一个文件夹，然后尝试将文件保存到该文件夹​​中.

The error massage appears in Console.WriteLine( of Completed method. Firts I create a folder and try to save file into it.

这项工作完成后，只需要本地服务器上的下载文件即可.

When this work, only need downloat file from local server.

谢谢.

推荐答案

您仅创建了一个文件夹，但没有创建用于下载文件的文件，您只需修改代码即可. webClient.DownloadFileAsync(new Uri("http://www.dada-data.net/uploads/image/hausmann_abcd.jpg"，文件夹)； 例如这样的

You only created a folder, but didn't create a file for download file, you can just modify your code webClient.DownloadFileAsync(new Uri("http://www.dada-data.net/uploads/image/hausmann_abcd.jpg"), folder); for example like this:

webClient.DownloadFileAsync(new Uri("http://www.dada-data.net/uploads/image/hausmann_abcd.jpg"), folder + "/abc.jpg"); 

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