/// <summary>
/// 分割文件
/// </summary>
/// <param name="remainingSize">剩余的大小(除完后的余数)</param>
/// <returns>每个线程应该下载的大小</returns>
private int SplitSize(string url, out int remainingSize)
{
long fileSize = NetWorkHelp.GetUrlFileSize(url);
//每一个线程应当下载的大小
int eachThreadShouldDownloadSize = (int)fileSize / this.MaxDownloadThread; //文件大小/最大下载线程数
remainingSize = (int)fileSize % this.MaxDownloadThread; //取余数
return(eachThreadShouldDownloadSize);
}
/// <summary>
/// 检查DownloadTask是否正确(不包括TaskID)
/// </summary>
/// <returns></returns>
public static bool Check(DownloadTask downloadTask)
{
if (NetWorkHelp.CanConnection(downloadTask.Url) == true &&
PathHelp.IsRightForRegex(downloadTask.Path))
{
return(true);
}
else
{
return(false);
}
}
/// <summary>
/// 创建一个DownloadTask(不包括ID)
/// </summary>
/// <param name="url"></param>
/// <param name="path"></param>
public static DownloadTask Create(string url, string path, MultiDownload target)
{
if (NetWorkHelp.CanConnection(url)) //链接是否可以连接
{ //是
if (path[path.Length - 1] != '\\') //为了修复Path.Combine方法的缺陷，防止路径合并错误
{
path = path + '\\';
}
//获取下载路径
string downloadPath = System.IO.Path.Combine(path + System.IO.Path.GetFileName(HttpUtility.UrlDecode(url))); //合并路径
DownloadTask downloadTask = new DownloadTask(target); //新建下载任务
downloadTask.Path = downloadPath; //将路径赋值
downloadTask.Url = url; //将链接赋值
downloadTask.State = DownloadTaskState.Waiting;
return(downloadTask);
}
else
{ //否
throw new UrlCanNotConnectionException(url); //抛出连接无法连接错误
}
}
