如何在C#流和Python脚本之间重复传递输入和输出

我正试图从C#运行一个Python脚本作为流，并使用StreamWriter和StreamReader在Python和流之间重复传递输入和输出。

我会读写，但显然只有一次，而不是多次。（这正是我需要的。）希望有人能告诉我我做错了什么。

（我知道我可能可以通过读写文件来做我需要做的事情。然而，如果可以的话，我想避免这种情况，因为使用Stream似乎更干净。）

这是我的C#代码：

using System;
using System.Diagnostics;
using System.IO;
public class Stream_Read_Write
{
    public static void Main()
    {
        string path = "C:''Users''thomas''Documents''Python_Scripts''io_test.py";
        string iter = "3";
        string input = "Hello!";
        stream_read_write(path, iter, input);
        //Keep Console Open for Debug
        Console.Write("end");
        Console.ReadKey();
    }
    private static void stream_read_write(string path, string iter, string input)
    {
        ProcessStartInfo start = new ProcessStartInfo();
        start.FileName = "C:''Python27''python.exe";
        start.Arguments = string.Format("{0} {1}", path, iter);
        start.UseShellExecute = false;
        start.RedirectStandardOutput = true;
        start.RedirectStandardInput = true;
        start.CreateNoWindow = true;
        using (Process process = Process.Start(start))
        using (StreamWriter writer = process.StandardInput)
        using (StreamReader reader = process.StandardOutput)
        {
            for (int i = 0; i < Convert.ToInt32(iter); i++)
            {
                Console.WriteLine("writing...");
                writer.WriteLine(input);
                writer.Flush();
                Console.WriteLine("written: " + input + "'n");
                Console.WriteLine("reading...");
                string result = reader.ReadLine();
                Console.WriteLine("read: " + result + "'n");
            }
        }
    }
}

Python代码如下：

import sys
iter = int(sys.argv[1])
for i in range(iter):
    input = raw_input()
    print (input)

这是我得到的输出：

writing...
written: Hello!
reading...

奇怪的是，当我从Python和C#中删除循环时，它就起作用了。（对于一次迭代）

writing...
written: Hello!
reading...
read: Hello!
end

我不清楚为什么会发生这种情况，也不清楚解决方案是什么，所以我们非常感谢任何帮助。

using System;
using System.Diagnostics;
using System.IO;
public class Stream_Read_Write
{
    public static void Main()
    {
        string path = "C:''Users''thomas_wortmann''Documents''Python_Scripts''io_test.py";
        string iter = "3";
        string input = "Hello";
        stream_read_write(path, iter, input);
        //Keep Console Open for Debug
        Console.Write("end");
        Console.ReadKey();
    }
    private static void stream_read_write(string path, string iter, string input)
    {
        ProcessStartInfo start = new ProcessStartInfo();
        start.FileName = "C:''Python27''python.exe";
        start.Arguments = string.Format("{0} {1}", path, iter);
        start.UseShellExecute = false;
        start.RedirectStandardOutput = true;
        start.RedirectStandardInput = true;
        start.CreateNoWindow = true;
        using (Process process = Process.Start(start))
        using (StreamWriter writer = process.StandardInput)
        using (StreamReader reader = process.StandardOutput)
        {
            for (int i = 0; i < Convert.ToInt32(iter); i++)
            {
                writer.WriteLine(input + i);
                Console.WriteLine("written: " + input + i);
                string result = null;
                while (result == null || result.Length == 0)
                { result = reader.ReadLine(); }
                Console.WriteLine("read: " + result + "'n");
            }
        }
    }
}

import sys
def reverse(input):
    return input [::-1]
iter = int(sys.argv[1])
for i in range(iter):
    input = sys.stdin.readline()
    print reverse(input)
    sys.stdout.flush()