//还原下载信息
protected virtual async Task <bool> LoadDownloadInfoAsync(bool LoadSrc = true)
{
try
{
if (File.Exists(DownloadInfoFileFullPath))
{
var downloadInfoText = File.ReadAllText(DownloadInfoFileFullPath);
var downloadInfo = JsonConvert.DeserializeObject <DownloadInfo>(downloadInfoText);
var count = downloadInfo.Count(m => m.Size == 0);
Console.WriteLine("downloadInfo" + count);
if (LoadSrc)
{
foreach (var item in downloadInfo)
{
if (item.TotalReadBytes < item.Size)
{
var httpClient = HttpClientFactory.Instance.GetHttpClient(item.Url ?? Url);
httpClient.DefaultRequestHeaders.Range = new RangeHeaderValue(item.Start + item.TotalReadBytes, item.End);
item.SrcStream = await httpClient.GetStreamAsync(item.Url ?? Url);
}
}
}
DownloadInfo.AddRange(downloadInfo);
return(true);
}
return(false);
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
return(false);
}
}
public virtual async Task LoadAsync()
{
//检查参数
CheckArgument();
//获取Server文件信息
DownloadInfo.ServerFileInfo = await ServerHelper.LoadServerInfoAsync(Url);
//本地文件路径
var fileName = SuggestedFileName ?? DownloadInfo.ServerFileInfo.Name;
//文件夹不存在，创建文件夹
if (!Directory.Exists(DirectoryPath))
{
Directory.CreateDirectory(DirectoryPath);
}
LocalFileFullPath = Path.Combine(DirectoryPath, fileName);
DownloadInfoFileFullPath = Path.Combine(DirectoryPath, $"{fileName}.json");
var loadSuccess = await LoadDownloadInfoAsync();
///没有成功需要重新加载
if (!loadSuccess)
{
if (File.Exists(LocalFileFullPath))
{
using (var localFile = new FileStream(LocalFileFullPath, FileMode.OpenOrCreate, FileAccess.Write, FileShare.ReadWrite))
{
if (localFile.Length >= DownloadInfo.ServerFileInfo.Size)
{
IsDownloaded = true;
await CompleteAsync(true);
return;
}
}
}
//拆分分片
var fileSegments = await this.LoadFileSegmentsAsync();
DownloadInfo.AddRange(fileSegments);
await SaveDownloadInfoAsync();
}
}