实际上我刚刚想出了答案.谢谢你们的回答，但事实证明我所要做的就是:

I've actually just figured out the answer. Thank you both for your answers, but it turns out that all i had to do was this:

p.StandardInput.Close()

这导致我生成的程序完成从标准输入读取并输出我需要的内容.

which causes the program I've spawned to finish reading from stdin and output what i need.