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

public bool DownloadFileWithTimeoutSync(string uri, string localPath)
{
    var ftpRequest = (FtpWebRequest)WebRequest.Create(uri);
    ftpRequest.Method = WebRequestMethods.Ftp.DownloadFile;
    // 設(shè)置FtpWebRequest其他屬性，如Credentials等

    Task<bool> ftpTask = Task.Run(() =>
    {
        try
        {
            using (var response = (FtpWebResponse)ftpRequest.GetResponse())
            using (var responseStream = response.GetResponseStream())
            using (var fileStream = System.IO.File.Create(localPath))
            {
                responseStream.CopyTo(fileStream);
            }
            return true; // 或者根據(jù)響應狀態(tài)返回成功/失敗
        }
        catch
        {
            return false;
        }
    });

    // 創(chuàng)建一個延遲10秒的超時任務(wù)
    Task delayTask = Task.Delay(TimeSpan.FromSeconds(10));

    // 等待FTP任務(wù)完成或超時
    var completedTask = Task.WhenAny(ftpTask, delayTask).GetAwaiter().GetResult();

    if (completedTask == ftpTask)
    {
        // FTP任務(wù)完成，檢查結(jié)果
        return ftpTask.GetAwaiter().GetResult();
    }
    else
    {
        // 超時發(fā)生
        // 這里可以根據(jù)需要取消FTP請求
        return false;
    }
}

var ftpRequest = (FtpWebRequest)WebRequest.Create(uri);
ftpRequest.Method = WebRequestMethods.Ftp.DownloadFile;

Task<bool> ftpTask = Task.Run(() => {
    // 這里包含下載文件的邏輯
});

Task delayTask = Task.Delay(TimeSpan.FromSeconds(10));
var completedTask = Task.WhenAny(ftpTask, delayTask).GetAwaiter().GetResult();

if (completedTask == ftpTask)
{
    // 檢查下載結(jié)果
    return ftpTask.GetAwaiter().GetResult();
}
else
{
    // 處理超時
    return false;
}