105 lines
3.8 KiB
C#
105 lines
3.8 KiB
C#
using System.IO;
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using System.Net.Http;
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using System.Windows.Controls;
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namespace Zerolauncher.dialog
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{
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/// <summary>
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/// DownloadControl.xaml 的交互逻辑
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/// </summary>
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public partial class DownloadControl : UserControl
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{
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const string cache_dir = "./.cache/auto.cache";
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public DownloadControl()
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{
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InitializeComponent();
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}
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private void OnError(Exception ex)
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{
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// UnityEngine.Debug.Log("捕获异常 >>> " + ex);
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}
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public async Task Download(string fileUrl)
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{
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using (HttpClient client = new HttpClient())
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{
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// 获取文件大小
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HttpResponseMessage responseHead = await client.SendAsync(new HttpRequestMessage(HttpMethod.Head, fileUrl));
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long? contentLength = responseHead.Content.Headers.ContentLength;
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Console.WriteLine($"文件大小：{contentLength} 字节");
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// 计算块大小
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int blockSize = 1024 * 1024; // 1MB
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int blockCount = (int)Math.Ceiling((double)contentLength / blockSize);
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// 创建SemaphoreSlim以限制同时进行的下载任务的数量
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SemaphoreSlim semaphore = new SemaphoreSlim(4); // 最多允许4个并发下载任务
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using (FileStream fileStream = new FileStream(cache_dir, FileMode.Create, FileAccess.Write, FileShare.None, blockSize, true))
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{
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// 创建任务列表
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Task[] tasks = new Task[blockCount];
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for (int i = 0; i < blockCount; i++)
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{
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int blockNumber = i;
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tasks[i] = Task.Run(async () =>
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{
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await semaphore.WaitAsync(); // 等待获取许可
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try
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{
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// 计算当前块的范围
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var start = blockNumber * blockSize;
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var end = (blockNumber == blockCount - 1) ? contentLength - 1 : start + blockSize - 1;
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// 设置请求头，请求指定范围的数据
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var request = new HttpRequestMessage { RequestUri = new Uri(fileUrl), Method = HttpMethod.Get };
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request.Headers.Range = new System.Net.Http.Headers.RangeHeaderValue(start, end);
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// 下载当前块
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using (HttpResponseMessage response = await client.SendAsync(request))
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{
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response.EnsureSuccessStatusCode();
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byte[] buffer = await response.Content.ReadAsByteArrayAsync();
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await fileStream.WriteAsync(buffer, 0, buffer.Length);
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}
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// 显示下载进度
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double percent = (double)(blockNumber + 1) / blockCount * 100;
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Console.WriteLine($"已下载：{percent:F2}%");
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}
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finally
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{
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semaphore.Release(); // 释放许可
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}
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});
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}
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// 等待所有任务完成
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await Task.WhenAll(tasks);
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}
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}
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Console.WriteLine("下载完成！");
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}
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private void OnUpdate(long size, long count)
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{
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}
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private void OnDone(byte[] data)
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{
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}
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private void OnDestroy()
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{
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}
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}
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}
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