如何用C#从php调用json_encode函数到asp.Net？

using System;
using System.Diagnostics;

class Program
{
    static void Main()
    {
        string phpPath = "path/to/php.exe";
        string phpScript = "path/to/php_script.php";

        ProcessStartInfo psi = new ProcessStartInfo();
        psi.FileName = phpPath;
        psi.Arguments = phpScript;
        psi.UseShellExecute = false;
        psi.RedirectStandardOutput = true;

        Process process = new Process();
        process.StartInfo = psi;
        process.Start();
        process.WaitForExit();

        string output = process.StandardOutput.ReadToEnd();
        Console.WriteLine(output);
    }
}