基本上我的DownloadFile函数是这样的:
我的问题是,一旦找到新版本并开始下载文件
我想让它在完成文件下载后再执行其余操作。我该怎么做?
-- 如果需要,以下是ProgressChanged:
public void DownloadFile()
{
settings_btn.Enabled = false;
label1.Text = "Checking for updates...";
//Defines the server's update directory
string Server = "http://downloadurl/update/";
//Defines application root
string Root = AppDomain.CurrentDomain.BaseDirectory;
//Make sure version file exists
FileStream fs = null;
if (!File.Exists("pversion"))
{
using (fs = File.Create("pversion")){}
using (StreamWriter sw = new StreamWriter("pversion")){sw.Write("1.0");}
}
//checks client version
string lclVersion;
using (StreamReader reader = new StreamReader("pversion"))
{
lclVersion = reader.ReadLine();
}
decimal localVersion = decimal.Parse(lclVersion);
//server's list of updates
XDocument serverXml = XDocument.Load(@Server + "pUpdates.xml");
//The Update Process
foreach (XElement update in serverXml.Descendants("pupdate"))
{
string version = update.Element("pversion").Value;
string file = update.Element("pfile").Value;
decimal serverVersion = decimal.Parse(version);
string sUrlToReadFileFrom = Server + file;
string sFilePathToWriteFileTo = Root + file;
if (serverVersion > localVersion)
{
using (webClient = new WebClient())
{
webClient.DownloadFileCompleted += new AsyncCompletedEventHandler(Completed);
webClient.DownloadProgressChanged += new DownloadProgressChangedEventHandler(ProgressChanged);
// The variable that will be holding the url address (making sure it starts with http://)
Uri url = new Uri(sUrlToReadFileFrom);
// Start the stopwatch which we will be using to calculate the download speed
sw.Start();
try
{
// Start downloading the file
webClient.DownloadFileAsync(url, sFilePathToWriteFileTo);
// Change the currently running executable so it can be overwritten.
Process thisprocess = Process.GetCurrentProcess();
string me = thisprocess.MainModule.FileName;
string bak = me + ".bak";
if (File.Exists(bak))
{
File.Delete(bak);
}
File.Move(me, bak);
File.Copy(bak, me);
//unzip
using (ZipFile zip = ZipFile.Read(file))
{
foreach (ZipEntry zipFiles in zip)
{
zipFiles.Extract(Root + "\\", true);
}
}
//download new version file
webClient.DownloadFile(Server + "pversion.txt", @Root + "pversion");
//Delete Zip File
deleteFile(file);
var spawn = Process.Start(me);
thisprocess.CloseMainWindow();
thisprocess.Close();
thisprocess.Dispose();
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
}
}
}
我的问题是,一旦找到新版本并开始下载文件
webClient.DownloadFileAsync(url, sFilePathToWriteFileTo);
,它会立即运行下面的代码,即更改名称、解压和下载新版本文件进度。我想让它在完成文件下载后再执行其余操作。我该怎么做?
-- 如果需要,以下是ProgressChanged:
private void ProgressChanged(object sender, DownloadProgressChangedEventArgs e)
{
label3.Text = string.Format("{0} kb/s", (e.BytesReceived / 1024d / sw.Elapsed.TotalSeconds).ToString("0.00")) + " " + string.Format("{0} MB's / {1} MB's", (e.BytesReceived / 1024d / 1024d).ToString("0.00"), (e.TotalBytesToReceive / 1024d / 1024d).ToString("0.00"));;
progressBar1.Value = e.ProgressPercentage;
label1.Text = e.ProgressPercentage.ToString() + "%";
}
已完成:
private void Completed(object sender, AsyncCompletedEventArgs e)
{
sw.Reset();
if (e.Cancelled == true)
{
label1.Text = "Download cancelled!";
}
else
{
label1.Text = "Download completed!";
}
}