我面临另一个问题,我的应用程序从网上下载文件,提取它,删除它等,它运行良好的第一次运行,然后当涉及到下载下一个文件它只是冻结下载并永远挂在那里..这可能是尝试打开一个已经打开的连接的东西,但我不知道如何关闭它,这是我第一次与C#联网,而且我是自学的。下载后WebClient冻结
我的代码:
public void start() {
if (File.Exists("Data/version.txt")) { File.Delete("Data/version.txt"); }
label1.Text = "Getting update information...";
WebClient webClient = new WebClient();
webClient.DownloadFileAsync(new Uri("http://127.0.0.1/update/version.txt"), @"Data/version.txt");
webClient.DownloadFileCompleted += new AsyncCompletedEventHandler(versionCompleted);
}
private void versioncheck() {
if (File.Exists("Main.exe"))
{
label1.Text = "Contacting update server...";
var versionInfo = FileVersionInfo.GetVersionInfo("Main.exe");
string version = versionInfo.ProductVersion;
string[] nversion = version.Split('.');
string updateversion = nversion[3];
int version = Int32.Parse(updateversion);
///////////////////////////////////////////////////////////
StreamReader sr = new StreamReader("Data/version.txt");
///////////////////////////////////////////////////////////
string readline = sr.ReadLine();
sr.Dispose();
int serverversion = Int32.Parse(readline);
if (serverversion > version) {
string filenumber = (version+1).ToString();
downloadfile(filenumber);
}
else if(serverversion == version){
label1.Text = "Game is up to date!";
startButton.Enabled = true;
}
}
else { MessageBox.Show("Unexpected Error!", "Error!"); }
}
private void ProgressChanged(object sender, DownloadProgressChangedEventArgs e)
{
progressBar1.Value = e.ProgressPercentage;
}
private void Completed(object sender, AsyncCompletedEventArgs e)
{
label1.Text = "Extracting Files...";
var versionInfo = FileVersionInfo.GetVersionInfo("Main.exe");
string version = versionInfo.ProductVersion;
string[] nversion = version.Split('.');
string updateversion = nversion[3];
int version = Int32.Parse(updateversion); string nversion = (version + 1).ToString();
Process proc = Process.Start("update"+nversion+".exe"); // extract in the silent mode
proc.WaitForExit();
File.Delete("update" + nversion + ".exe");
label1.Text = "Checking for more updates...";
versioncheck();
}
private void versionCompleted(object sender, AsyncCompletedEventArgs e) {
versioncheck();
}
private void downloadfile(string filenumber)
{
try
{
//MessageBox.Show("Download working");
System.Net.WebClient webClient = new System.Net.WebClient();
webClient.OpenRead("http://127.0.0.1/Update/update" + filenumber + ".exe");
Int64 bytes_total = Convert.ToInt64(webClient.ResponseHeaders["Content-Length"]);
string updatelength = Convert.ToString((bytes_total/1024).ToString());
label2.Text = "File size:" + updatelength + "KB";
////////////////////////////////////////////////////
label1.Text = "Downloading Update...";
webClient.DownloadProgressChanged += new DownloadProgressChangedEventHandler(ProgressChanged);
webClient.DownloadFileAsync(new Uri("http://127.0.0.1/Update/update" + filenumber + ".exe"), @"update"+filenumber+".exe");
webClient.DownloadFileCompleted += new AsyncCompletedEventHandler(Completed);
webClient.Dispose();
}
catch (WebException)
{
MessageBox.Show("Connection error!", "Error!");
Application.Exit();
}
catch (IOException)
{
MessageBox.Show("Unknown Error!", "Error!");
Application.Exit() ;
}
}
你可以断点到versionCheck()吗?它到达那里了吗?第一次下载完成后,您的表单是否被锁定?我不记得了,但如果是这种情况,'DownloadFileCompleted'事件可能会回调到主窗体线程中。另外,尝试将'DownloadFileCompleted'调用移动到'DownloadFileAsync'上方的行。考虑到文件可能很大,这可能不会做任何事情,但无论如何这是一个好主意。 – Brandon
此外,您将重新声明变量作为不同类型的地方。 – Brandon
是的,我认为重新宣布它们会更容易,而不是用不同的名称创建新的,只是为了不会迷路,我相信当我重新声明它们时,它会摆脱旧的,是我错误?请纠正我的错误,如果你可能:) 而一切正常,事情是它应该下载3个文件连续,它只下载一个,当它开始下载第二个,它显示它的大小= 0字节在磁盘上,直到我重新启动它。 –