/// <summary>
/// 检查当前是否需要升级
/// </summary>
private async Task CheckUpgradeAsync()
{
    UpgradeFileManage();
    HttpClient http = new HttpClient();
    var content = new StringContent(JsonConvert.SerializeObject(new VersionCheckInput()));
    content.Headers.ContentType = new MediaTypeHeaderValue("application/json");
    var response = await http.PostAsync("https://download.haojima.net/api/IoTClient/VersionCheck", content);
    var result = await response.Content.ReadAsStringAsync();
    var VersionObj = JsonConvert.DeserializeObject<ResultBase<VersionCheckOutput>>(result);
    if (VersionObj.Code == 200 && VersionObj.Data.Code == 1)
    {
        if (MessageBox.Show("IoTClient有新版本，是否升级到最新版本？", "版本升级", MessageBoxButtons.OKCancel) == DialogResult.OK)
        {
            if (new UpgradeForm().ShowDialog() != DialogResult.OK) return;
            var newApp = Application.StartupPath + @"\temp." + Path.GetFileName(Application.ExecutablePath);
            //打开临时文件 关闭并旧版本
            Process.Start(newApp);
            Close();
            Environment.Exit(0);
        }
    }
}

/// <summary>
/// 升级文件处理
/// </summary>
private void UpgradeFileManage()
{
    //如果启动的升级临时文件，
    //则1、删除旧版本 2、复制当前临时文件为新版本 3、启动新版本 4、关闭当前打开的临时版本
    if (Path.GetFileName(Application.ExecutablePath).Contains("temp."))
    {
        var filePath = Path.Combine(Application.StartupPath, Path.GetFileName(Application.ExecutablePath).Replace("temp.", ""));
        var newFilePath = filePath;
        try
        {
            try
            {
                //2.1删除旧版本
                if (File.Exists(filePath)) File.Delete(filePath);
            }
            catch (Exception)
            {
                //如果因为进程正在使用中则休眠后再重试
                //出现此问题的原因是，上一个程序还没关闭，这个程序就启动了，启动后会执行删除上一个程序，所以报错。
                Thread.Sleep(500);
                if (File.Exists(filePath)) File.Delete(filePath);
            }
            //3、复制临时文件为新的文件 打开新的文件
            File.Copy(Application.ExecutablePath, newFilePath);
            //3、打开新的文件
            Process.Start(filePath);
            //4、关闭临时文件
            //Close();
            Environment.Exit(0);
        }
        catch (Exception ex)
        {
            MessageBox.Show("升级失败 " + ex.Message);
        }
    }
    //4.2如果当前启动的不是临时文件，则删除临时文件。
    else
    {
        var filePath = Path.Combine(Application.StartupPath, "temp." + Path.GetFileName(Application.ExecutablePath));
        try
        {
            if (File.Exists(filePath)) File.Delete(filePath);
        }
        catch (Exception)
        {
            Thread.Sleep(500);
            if (File.Exists(filePath)) File.Delete(filePath);
        }
    }
}

public UpgradeForm()
{
    InitializeComponent();
    TopMost = true;
    StartPosition = FormStartPosition.CenterScreen;
    FormBorderStyle = FormBorderStyle.FixedSingle;
    CheckForIllegalCrossThreadCalls = false;
    Task.Run(async () =>
    {
        await DownloadAsync();
        DialogResult = DialogResult.OK;
        Close();
    });
}

public async Task DownloadAsync()
{
    long downloadSize = 0;//已经下载大小
    long downloadSpeed = 0;//下载速度
    using (HttpClient http = new HttpClient())
    {
        string contentType = "application/json";
        http.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue(contentType));
        http.DefaultRequestHeaders.Add("Authorization", $"Bearer 043fc7d1a15bbaa6e48591baadc6f8ea");

        var httpResponseMessage = await http.GetAsync("http://localhost/api/v1.0/niuNiuCalc/download?fileName=NiuNiuCalcCsClient.exe&clientType=PC", HttpCompletionOption.ResponseHeadersRead);//发送请求
        var contentLength = httpResponseMessage.Content.Headers.ContentLength;   //文件大小
        if (contentLength == null)
        {
            MessageBox.Show("服务器忙，请稍后再试。");
            return;
        }
        using (var stream = await httpResponseMessage.Content.ReadAsStreamAsync())
        {
            var readLength = 102400;//100K
            byte[] bytes = new byte[readLength];
            int writeLength;
            var beginSecond = DateTime.Now.Second;//当前时间秒
            //使用追加方式打开一个文件流
            var filePath = Application.StartupPath + @"\temp." + Path.GetFileName(Application.ExecutablePath);
            using (FileStream fs = new FileStream(filePath, FileMode.Append, FileAccess.Write))
            {
                while ((writeLength = stream.Read(bytes, 0, readLength)) > 0)
                {
                    fs.Write(bytes, 0, writeLength);
                    downloadSize += writeLength;
                    downloadSpeed += writeLength;
                    progressBar1.Invoke((Action)(() =>
                    {
                        var endSecond = DateTime.Now.Second;
                        if (beginSecond != endSecond)//计算速度
                        {
                            downloadSpeed = downloadSpeed / (endSecond - beginSecond);
                            Text = "下载速度" + downloadSpeed / 1024 + "KB/S";
                            beginSecond = DateTime.Now.Second;
                            downloadSpeed = 0;//清空
                        }
                        progressBar1.Value = Math.Max((int)(downloadSize * 100 / contentLength), 1);
                    }));
                }
            }
        }
    }
}