Question

我在服务器中有一个大小为164 MB的exe文件，用于安装sccm软件包。我正在尝试使用WebClient Async方法将此文件下载到客户端计算机。

该文件大部分时间都在部分下载。安装因此失败。在下面添加我的代码。

PS：

hostpath="https://naagentswhk.cognizant.com/US_IBCM_InstallerV1.exe"
filepath="D:\Users\417193\AppData\Local\SupportSoft\expertouchent\417193\exec"

代码：

private static Boolean  DownloadFile(string HostPath,string Filepath)
{
    WebClient webClient = new WebClient();
    webClient.DownloadFileCompleted += new AsyncCompletedEventHandler(Completed);

    // webClient.DownloadProgressChanged += new DownloadProgressChangedEventHandler(Downloader_DownloadProgressChanged);
    webClient.DownloadFileAsync(new Uri(HostPath), Filepath);

    return true;
}

此问题是否与Async功能相关？

Answer 1

要下载我正在使用此代码的文件，它正在为我工作

    private void button1_Click(object sender, EventArgs e)
    {
        WebClient webClient = new WebClient();
        webClient.DownloadFileCompleted += new AsyncCompletedEventHandler(Completed);
        webClient.DownloadProgressChanged += new DownloadProgressChangedEventHandler(ProgressChanged);
        webClient.DownloadFileAsync(new Uri("https://naagentswhk.cognizant.com/US_IBCM_InstallerV1.exe"), @"D:\Users\417193\AppData\Local\SupportSoft\expertouchent\417193\exec\US_IBCM_InstallerV1.exe");
    }
    private void ProgressChanged(object sender, DownloadProgressChangedEventArgs e)
    {
        progressBar1.Value = e.ProgressPercentage;
    }

    private void Completed(object sender, AsyncCompletedEventArgs e)
    {
        MessageBox.Show("Download completed!");
    }

Answer 2

看看when and how to use async await

private static async Task DownloadFile(string HostPath,string Filepath)
{
    WebClient webClient = new WebClient();


    await webClient.DownloadFileAsync(new Uri(HostPath), Filepath);
}

// usage

private async void SomeMethod(){

   await DownloadFile("url", "path local');
   // it's ready for use. 
   ReadFile("path local)// File is already downloaded at this point
}

使用Windows从服务器下载文件

2 个答案: