process.StandardOutput.ReadToEnd returns null

我有这样的代码:

在c# Windows的形式工作正确…但是在asp.net中它返回null

        var tempCadena = HttpContext.Current.Server.MapPath("~/" + HttpContext.Current.Session["db"] + "/" + "cadena");
        System.IO.File.WriteAllText(tempCadena, cadena);
        // Digestion SHA1
        var tempSha = HttpContext.Current.Server.MapPath("~/" + HttpContext.Current.Session["db"] + "/" + "sha");
        var opensslPath = HttpContext.Current.Server.MapPath("~/openssl/bin/openssl.exe");
        Process process = new Process();
        process.StartInfo.WindowStyle = ProcessWindowStyle.Minimized;
        process.StartInfo.FileName = opensslPath;
        process.StartInfo.Arguments = "dgst -sha1 " + tempCadena;
        process.StartInfo.UseShellExecute = false;
        process.StartInfo.ErrorDialog = false;
        process.StartInfo.RedirectStandardOutput = true;
        process.Start();

        string codificado = "";
        codificado = process.StandardOutput.ReadToEnd();
        process.WaitForExit();

codificado = null有人能帮帮我吗?

我试图改变进程为ProcessStartInfo和不工作