编辑“︁C Sharp Task 基础”︁（章节）

=== 并行下载文件 ===

以下示例展示如何使用Task并行下载多个文件：

<syntaxhighlight lang="csharp">
using System;
using System.Net.Http;
using System.Threading.Tasks;

class Program
{
    static async Task Main()
    {
        string[] urls = 
        {
            "https://example.com/file1.txt",
            "https://example.com/file2.txt",
            "https://example.com/file3.txt"
        };

        HttpClient client = new HttpClient();
        Task[] downloadTasks = new Task[urls.Length];

        for (int i = 0; i < urls.Length; i++)
        {
            string url = urls[i];
            downloadTasks[i] = Task.Run(async () => 
            {
                string content = await client.GetStringAsync(url);
                Console.WriteLine($"下载完成: {url}, 长度: {content.Length}");
            });
        }

        await Task.WhenAll(downloadTasks);
        Console.WriteLine("所有文件下载完成！");
    }
}
</syntaxhighlight>

'''输出（假设文件存在）：'''
<pre>
下载完成: https://example.com/file1.txt, 长度: 1024
下载完成: https://example.com/file2.txt, 长度: 2048
下载完成: https://example.com/file3.txt, 长度: 512
所有文件下载完成！
</pre>