我想在用户下载zip或相同内容时在后台进度中创建进度条。这是我的代码：
private void DoSincroFit()
{
HttpWebRequest request = HttpWebRequest.CreateHttp(url);
//Add headers to request
request.Headers["Type"] = "sincrofit";
request.Headers["Device"] = "1";
request.Headers["Version"] = "0.000";
request.Headers["Os"] = "WindowsPhone";
request.BeginGetResponse(new AsyncCallback(playResponseAsync), request);
}
public async void playResponseAsync(IAsyncResult asyncResult)
{
//Declaration of variables
HttpWebRequest webRequest = (HttpWebRequest)asyncResult.AsyncState;
try
{
string fileName = "sincrofit.rar";
using (HttpWebResponse webResponse = (HttpWebResponse)webRequest.EndGetResponse(asyncResult))
{
byte[] buffer = new byte[1024];
var newZipFile = await ApplicationData.Current.LocalFolder.CreateFileAsync(fileName, CreationCollisionOption.ReplaceExisting);
using (var writeStream = await newZipFile.OpenAsync(FileAccessMode.ReadWrite))
{
using (var outputStream = writeStream.GetOutputStreamAt(0))
{
using (var dataWriter = new DataWriter(outputStream))
{
using (Stream input = webResponse.GetResponseStream())
{
var totalSize = 0;
for (int size = input.Read(buffer, 0, buffer.Length); size > 0; size = input.Read(buffer, 0, buffer.Length))
{
dataWriter.WriteBytes(buffer);
totalSize += size; //get the progress of download
//I think the progress bar going here!
}
await dataWriter.StoreAsync();
await outputStream.FlushAsync();
dataWriter.DetachStream();
}
}
}
}
}
}
catch
{
CoreDispatcher dispatcher = CoreWindow.GetForCurrentThread().Dispatcher;
dispatcher.RunAsync(CoreDispatcherPriority.Normal, async () =>
{
//Declaration of variables
SMethods.Message_Dialog("Download has stopped!", "Error");
});
}
}
这是调用背景方法的方法
public async Task<string> doSync(ProgressBar bar)
{
//Declaration of variables
string response = await DoRequest("CHECK", "1", "0.000", "WindowsPhone");
pBar = bar;
//When is 1, the checkConnection will connect
if (response == "1")
{
response = response + "," + await DoRequest("SIZEFIT", "1", "0.000", "WindowsPhone");
DoSincroFit();
response += "," + await DoRequest("DELSINC", "1", "0.000", "WindowsPhone");
return response;
}
return "0,0,0";
}
如果这是一个外部类，我如何创建进度条？确切地说，doSync和DoSincroFit属于Sync.cs，我的UI是MyPage.Xaml.cs。
提前致谢！
答案 0 :(得分：1)
如果您使用的是MVVM，则可能会创建在更改时通知的属性。然后，您不应该对UI表示真正了解的外部代码只是更新这些属性。
然后，在您的UI代码中，您将控件绑定到这些属性。
在不了解您的应用程序的情况下，我不能在此提供任何具体内容。
答案 1 :(得分：0)
最后我可以解决这个问题！我的进度条现在可以正常工作！
private void DoSincroFit()
{
HttpWebRequest request = HttpWebRequest.CreateHttp(url);
//Add headers to request
request.Headers["Type"] = "sincrofit";
request.Headers["Device"] = "1";
request.Headers["Version"] = "0.000";
request.Headers["Os"] = "WindowsPhone";
//Windows Cache Problems
request.Headers["Cache-Control"] = "no-cache";
request.Headers["Pragma"] = "no-cache";
dispatcher = CoreWindow.GetForCurrentThread().Dispatcher;
request.BeginGetResponse(new AsyncCallback(playResponseAsync), request);
}
public async void playResponseAsync(IAsyncResult asyncResult)
{
//Declaration of variables
HttpWebRequest webRequest = (HttpWebRequest)asyncResult.AsyncState;
try
{
//For download file with stream
string fileName = "sincrofit.rar";
using (HttpWebResponse webResponse = (HttpWebResponse)webRequest.EndGetResponse(asyncResult))
{
byte[] buffer = new byte[1];
//For acces Local folder of phone device
var newZipFile = await ApplicationData.Current.LocalFolder.CreateFileAsync(fileName, CreationCollisionOption.ReplaceExisting);
//Progress bar and their update
using (var writeStream = await newZipFile.OpenAsync(FileAccessMode.ReadWrite))
{
using (var outputStream = writeStream.GetOutputStreamAt(0))
{
using (var dataWriter = new DataWriter(outputStream))
{
using (Stream input = webResponse.GetResponseStream())
{
var totalSize = 0;
int read;
uint zeroUint = Convert.ToUInt32(0);
uint readUint;
while ((read = input.Read(buffer, 0, buffer.Length)) > 0)
{
totalSize += read;
await dispatcher.RunAsync(CoreDispatcherPriority.Normal, () =>
{
//Declaration of variables
pBar.Value = totalSize * 100 / sizeFit;
});
readUint = Convert.ToUInt32(read);
IBuffer ibuffer = buffer.AsBuffer();
dataWriter.WriteBuffer(ibuffer, zeroUint, readUint);
}
await dataWriter.StoreAsync();
await outputStream.FlushAsync();
dataWriter.DetachStream();
}
}
}
}
}
}
catch
{
//For control errors stopped progress bar
dispatcher.RunAsync(CoreDispatcherPriority.Normal, async () =>
{
//Declaration of variables
SMethods.Message_Dialog("Download has stopped!", "Error");
});
}
}
这是一个测试进度条但是如果你需要下载一个大的zip然后使用1024或者相同的缓冲区......因为1个字节可能很糟糕！谢谢大家！ ：）