/// <summary>
/// 初始化下载任务的新实例。
/// </summary>
public DownloadTask()
{
m_Status = DownloadTaskStatus.Todo;
m_DownloadPath = null;
m_DownloadUri = null;
m_FlushSize = 0;
m_Timeout = 0f;
}
/// <summary>
/// 清理下载任务。
/// </summary>
public override void Clear()
{
base.Clear();
m_Status = DownloadTaskStatus.Todo;
m_DownloadPath = null;
m_DownloadUri = null;
m_FlushSize = 0;
m_Timeout = 0f;
}
public DownloadTaskInfo(String md5, String url, String localPath, DownloadTaskStatus status,
Int64 totalSize, Int64 finishedSize)
{
this.md5 = md5;
this.url = url;
this.localPath = localPath;
this.status = status;
this.totalSize = totalSize;
this.finishedSize = finishedSize;
}
public DownloadTaskInfo(String md5, String url, String localPath, DownloadTaskStatus status,
Int64 totalSize, Int64 finishedSize)
{
this.md5 = md5;
this.url = url;
this.localPath = localPath;
this.status = status;
this.totalSize = totalSize;
this.finishedSize = finishedSize;
}
/// <summary>
/// 初始化下载任务的新实例。
/// </summary>
/// <param name="downloadPath">下载后存放路径。</param>
/// <param name="downloadUri">原始下载地址。</param>
/// <param name="flushSize">将缓冲区写入磁盘的临界大小。</param>
/// <param name="timeout">下载超时时长，以秒为单位。</param>
/// <param name="userData">用户自定义数据。</param>
public DownloadTask(string downloadPath, string downloadUri, int flushSize, float timeout, object userData)
{
m_SerialId = s_Serial++;
m_Done = false;
m_Status = DownloadTaskStatus.Todo;
m_DownloadPath = downloadPath;
m_DownloadUri = downloadUri;
m_FlushSize = flushSize;
m_Timeout = timeout;
m_UserData = userData;
}
/// <summary>
/// 初始化下载任务的新实例。
/// </summary>
public DownloadTask()
{
m_SerialId = 0;
m_Priority = 0;
m_Done = false;
m_Status = DownloadTaskStatus.Todo;
m_DownloadPath = null;
m_DownloadUri = null;
m_FlushSize = 0;
m_Timeout = 0f;
m_UserData = null;
}
/// <summary>
/// Instantiates a new instance of the DownloadTask class
/// </summary>
/// <param name="url">The url to the file to download.</param>
/// <exception cref="System.ArgumentException">An invalid HTTP url was passed into the constructor.</exception>
public DownloadTask(string url)
{
Uri u = new Uri(url);
if (!u.IsAbsoluteUri && !(u.Scheme == "http")) // validate url
{
throw new ArgumentException("Only downloads over HTTP are supported.", "url");
}
BufferSize = DefaultBufferSize;
downloadWatch = new Stopwatch();
_url = url;
_status = DownloadTaskStatus.NotStarted;
_deleteWhenCanceled = true;
// notify change in elapsed time every second (timer started when download starts)
elapsedTimer = new System.Timers.Timer(1000);
elapsedTimer.Elapsed += (s, args) => {
RaisePropertyChanged("Elapsed");
};
}
public static Boolean HasError(this DownloadTaskStatus status)
{
return(status == DownloadTaskStatus.Failed);
}
public static Boolean CanPause(this DownloadTaskStatus status)
{
return(status == DownloadTaskStatus.Waiting || status == DownloadTaskStatus.Downloading);
}
public static Boolean CanStart(this DownloadTaskStatus status)
{
return(status == DownloadTaskStatus.Paused || status == DownloadTaskStatus.Failed);
}
public DownloadTask(string downloadPath, string downloadUri, int flushSize, float timeout) {
m_SerialId = s_Serial++;
m_Done = false;
m_Status = DownloadTaskStatus.Todo;
}
/// <summary>
/// Instantiates a new instance of the DownloadTask.StatusChangedEventArgs class.
/// </summary>
/// <param name="status">Download state.</param>
public StatusChangedEventArgs(DownloadTaskStatus status)
{
Status = status;
}
