等待文件，直到使用C#下载文件

using System;
using System.Net;

class Program
{
    static void Main()
    {
        string fileUrl = "文件的URL地址";
        string savePath = "保存文件的本地路径";

        using (WebClient client = new WebClient())
        {
            // 下载文件
            client.DownloadFile(fileUrl, savePath);
        }

        Console.WriteLine("文件下载完成！");
    }
}

using System;
using System.Net;
using System.Threading.Tasks;

class Program
{
    static async Task Main()
    {
        string fileUrl = "文件的URL地址";
        string savePath = "保存文件的本地路径";

        using (WebClient client = new WebClient())
        {
            // 异步下载文件
            await client.DownloadFileTaskAsync(fileUrl, savePath);
        }

        Console.WriteLine("文件下载完成！");
    }
}