/// <summary>
/// 执行DownloadFile
/// </summary>
/// <param name="downloadFile"></param>
/// <returns></returns>
public async Task <bool> DoDownloadFile(DownloadFile downloadFile)
{
using (HttpClient httpClient = new HttpClient()
{
Timeout = TimeSpan.FromSeconds(30)
})
{
try
{
httpClient.DefaultRequestHeaders.Range = new RangeHeaderValue(downloadFile.RangeBegin, null);
HttpResponseMessage httpResponseMessage = await httpClient.GetAsync(downloadFile.URL, HttpCompletionOption.ResponseHeadersRead);
long?contentLength = httpResponseMessage.Content.Headers.ContentLength;
if (httpResponseMessage.Content.Headers.ContentRange != null) //如果为空，则说明服务器不支持断点续传
{
contentLength = httpResponseMessage.Content.Headers.ContentRange.Length; //服务器上的文件大小
}
long?length = (httpResponseMessage.Content.Headers.ContentRange == null ? //如果为空，则说明服务器不支持断点续传
httpResponseMessage.Content.Headers.ContentLength :
httpResponseMessage.Content.Headers.ContentRange.Length) ?? -1; //服务器上的文件大小
string md5 = downloadFile.MD5 ?? (httpResponseMessage.Content.Headers.ContentMD5 == null ? null : Convert.ToBase64String(httpResponseMessage.Content.Headers.ContentMD5));
if (downloadFile.DoLocal(length, md5))
{
using (Stream stream = await httpResponseMessage.Content.ReadAsStreamAsync())
{
stream.ReadTimeout = 10 * 1000;
bool success = await Download(stream, downloadFile) & await downloadFile.Release();
this.OnDownloadCompleted(new CompletedArgs(success));
return(success);
}
}
else
{
this.OnDownloadError(new ErrorArgs("服务器的上的版本已经变化"));
return(false);
}
}
catch (Exception ex)
{
this.OnDownloadError(new ErrorArgs(ex.Message));
return(false);
}
}
}