private async Task SetUpAsync()
{
string localFullName = $"{DownloadPath}setup.exe";
Uri uri = new Uri("http://Public.mujiannan.me/1Math/setup.exe");
Reportor.Report($"下载{uri.AbsolutePath}至{localFullName}，请耐心等待...");
await DownloadAsync(uri, localFullName);
System.Diagnostics.Process.Start(localFullName);
}
public async Task StartInstallerAsync()
{
//进行两步操作（导入证书、注入注册表）
//优先选择导入证书，如果证书导入失败，则转而尝试注册表
//当两步操作都失败时，向外传递异常信息
string errInfo = string.Empty; //用于记录错误信息
bool trustSuccess = false; //标记证书是否导入成功
try
{
await CertAsync();//导入证书
trustSuccess = true;
}
catch (Exception Ex)
{
errInfo += Ex.Message;//记录证书导入错误消息
Reportor.Report("错误：证书导入失败，请联网并使用管理员权限运行");
}
if (!trustSuccess)
{
try //事实上，如果上一步证书没导入成功，再来尝试写注册表也基本上是无济于事的
{
Reg.SetTrustPromptBehavior(); //写入注册表
trustSuccess = true;
}
catch (Exception Ex)
{
errInfo += Ex.Message;
this.Reportor.Report("错误：注册表写入失败，请尝试使用管理员权限运行");
}
}
if (trustSuccess)//当导入证书与注册表写入有任何一项成功时，都可以正常执行下载、安装的操作
{
await SetUpAsync();
}
else
{
await Task.Delay(2000); //显示最终的错误信息前，留点时间告诉用户要用管理员权限运行
throw new Exception(errInfo); //别在本地存日志之类的，直接显示出来吧……
}
}
private async Task DownloadAsync(Uri uri, string localFullName)
{
HttpClientHandler httpClientHandler = new HttpClientHandler();
ProgressMessageHandler progressMessageHandler = new ProgressMessageHandler(httpClientHandler);
HttpClient httpClient = new HttpClient(progressMessageHandler);
progressMessageHandler.HttpReceiveProgress += (object sender, HttpProgressEventArgs e) => Reportor.Report(e.ProgressPercentage);//捕获下载进度，向外汇报
FileStream fileStream = File.Create(localFullName, 1024, FileOptions.Asynchronous);
byte[] bytes = await httpClient.GetByteArrayAsync(uri);
fileStream.Write(bytes, 0, bytes.Length);
fileStream.Flush();
fileStream.Close();
}