/// <summary>
/// 下载文件
/// </summary>
/// <param name="client"></param>
/// <param name="requestUri">请求地址</param>
/// <param name="path">保存文件路径带文件名</param>
/// <param name="progress">下载进度通知</param>
/// <param name="cancellationToken">线程取消令牌</param>
/// <remarks>https://www.cnblogs.com/h82258652/p/10950580.html</remarks>
/// <returns></returns>
public static async Task GetByteArrayAsync(this HttpClient client, string requestUri, string path, IProgress <HttpDownloadProgress> progress, CancellationToken cancellationToken)
{
var request = new HttpRequestMessage(HttpMethod.Get, new Uri(requestUri));
request.Headers.Add("User-Agent", "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.108 Safari/537.36");
using var responseMessage = await client.SendAsync(request, HttpCompletionOption.ResponseHeadersRead, cancellationToken).ConfigureAwait(false);
responseMessage.EnsureSuccessStatusCode();
var content = responseMessage.Content;
var headers = content.Headers;
var contentLength = headers.ContentLength;
await using var responseStream = await content.ReadAsStreamAsync(cancellationToken).ConfigureAwait(false);
int bufferSize = 1024;
var buffer = new byte[bufferSize];
int bytesRead;
var downloadProgress = new HttpDownloadProgress();
if (contentLength.HasValue)
{
downloadProgress.TotalBytesToReceive = (ulong)contentLength.Value;
}
progress.Report(downloadProgress);
await using FileStream fileStream = File.Open(path, FileMode.Create);
while ((bytesRead = await responseStream.ReadAsync(buffer, 0, bufferSize, cancellationToken).ConfigureAwait(false)) > 0)
{
await fileStream.WriteAsync(buffer.Take(bytesRead).ToArray(), cancellationToken);
downloadProgress.BytesReceived += (ulong)bytesRead;
progress?.Report(downloadProgress);
}
await fileStream.FlushAsync(cancellationToken);
}
/// <summary>
/// 下载文件
/// </summary>
/// <param name="requestUri">请求地址</param>
/// <param name="path">保持文件路径带文件名</param>
/// <param name="progress">下载进度通知</param>
/// <param name="cancellationToken">线程取消令牌</param>
/// <remarks>https://www.cnblogs.com/h82258652/p/10950580.html</remarks>
/// <returns></returns>
public async Task DownloadAsync(string requestUri, string path, IProgress <HttpDownloadProgress> progress, CancellationToken cancellationToken)
{
using var responseMessage = await _client.GetAsync(new Uri (requestUri), HttpCompletionOption.ResponseHeadersRead, cancellationToken).ConfigureAwait(false);
responseMessage.EnsureSuccessStatusCode();
var content = responseMessage.Content;
var headers = content.Headers;
var contentLength = headers.ContentLength;
await using var responseStream = await content.ReadAsStreamAsync(cancellationToken).ConfigureAwait(false);
int bufferSize = 1024;
var buffer = new byte[bufferSize];
int bytesRead;
var downloadProgress = new HttpDownloadProgress();
if (contentLength.HasValue)
{
downloadProgress.TotalBytesToReceive = (ulong)contentLength.Value;
}
progress.Report(downloadProgress);
await using FileStream fileStream = File.Open(path, FileMode.Create);
while ((bytesRead = await responseStream.ReadAsync(buffer, 0, bufferSize, cancellationToken).ConfigureAwait(false)) > 0)
{
await fileStream.WriteAsync(buffer.Take(bytesRead).ToArray(), cancellationToken);
downloadProgress.BytesReceived += (ulong)bytesRead;
progress?.Report(downloadProgress);
}
await fileStream.FlushAsync(cancellationToken);
}
