/// <summary>
/// 下载
/// </summary>
/// <param name="eType">类型</param>
/// <param name="sUrl">连接</param>
/// <param name="sFilePathName">文件名</param>
/// <param name="iTimeOut">超时时间</param>
/// <returns></returns>
private static object Download(DOWNLOAD_TYPE eType, string sUrl, string sFilePathName, int iTimeOut)
{
object aRet = null;
WebClientEx aClient = new WebClientEx(iTimeOut);
try
{
WebRequest myre = WebRequest.Create(sUrl);
if (eType == DOWNLOAD_TYPE.FILE)
{
if (String.IsNullOrWhiteSpace(sFilePathName))
{
return(null);
}
var di = new DirectoryInfo(Path.GetDirectoryName(sFilePathName));
if (!di.Exists)
{
di.Create();
}
aClient.DownloadFile(sUrl, sFilePathName);
aRet = 0;
}
if (eType == DOWNLOAD_TYPE.STIRNG)
{
aClient.Encoding = System.Text.Encoding.UTF8;//定义对象语言
aRet = aClient.DownloadString(sUrl);
}
if (eType == DOWNLOAD_TYPE.DATA)
{
aRet = aClient.DownloadData(sUrl);
}
}
catch
{
aClient.Dispose();
return(aRet);
}
aClient.Dispose();
return(aRet);
}
/// <summary>
/// Main control download method.
/// </summary>
/// <param name="downloadType">下载类型:少量下载或大量下载</param>
private async void StartDownload(DOWNLOAD_TYPE downloadType)
{
if (!Directory.Exists(Define.GetFileSavePath()))
{
Directory.CreateDirectory(Define.GetFileSavePath());
}
//Initialize the UI about download
SetProgressInt(0);
button_DownloadCancel.Visible = true;
string[] willDownloadList;
int totalCount;
var nowFileIndex = 0;
switch (downloadType)
{
case DOWNLOAD_TYPE.AllFiles:
totalCount = _listResult.Length;
willDownloadList = _listResult;
break;
case DOWNLOAD_TYPE.SeletFiles:
totalCount = listBoxResult.SelectedItems.Count;
if (totalCount < 1)
{
MessageBox.Show(@"未选择要下载的文件，请点击选择某项或多项文件，再开始下载。", "Notice");
button_DownloadCancel.Visible = false;
return;
}
var checkedNameList = new string[totalCount];
for (var i = 0; i < totalCount; i++)
{
checkedNameList[i] = listBoxResult.SelectedItems[i].ToString();
}
willDownloadList = checkedNameList;
break;
default:
totalCount = _listResult.Length;
willDownloadList = _listResult;
break;
}
//Start Downlaod
try
{
var cancelToken = CancelSource.Token;
var scheduler = new LimitedConcurrencyLevelTaskScheduler(Define.MaxDownloadTasks);
var downloadTaskFactory = new TaskFactory(scheduler);
if (totalCount <= 15)
{
IsSeveralFiles = true;
foreach (var fileName in willDownloadList)
{
await downloadTaskFactory.StartNew(async nowFileName =>
{
nowFileIndex++;
await DownloadFiles(fileName, nowFileIndex, totalCount, AUTO_DECRYPT.Auto);
}, fileName);
}
}
else
{
IsSeveralFiles = false;
Define.DownloadTaskSleep = totalCount < 200 ? 100 : totalCount > 1000 ? 500 : totalCount / 3;
foreach (var fileName in willDownloadList)
{
await downloadTaskFactory.StartNew(async nowFileName =>
{
nowFileIndex++;
Thread.Sleep(nowFileIndex % 25 == 0
? 500
: Define.DownloadTaskSleep);
await DownloadFiles(nowFileName.ToString(), nowFileIndex, totalCount, AUTO_DECRYPT.Auto);
}, fileName, cancelToken);
}
}
cancelToken.ThrowIfCancellationRequested();
}
catch (Exception e)
{
MessageBox.Show(e.Message);
}
}
