VS2013的简单WInForm控件，通过WebRequest，WebResponse来访问，接收：

private void btn_interface_Click(object sender, EventArgs e)
    {
      string url = "http://127.0.0.1:5000";
      WebRequest wRequest = WebRequest.Create(url);
      wRequest.Method = "GET";
      wRequest.ContentType = "text/html;charset=UTF-8";
      WebResponse wResponse = wRequest.GetResponse();
      Stream stream = wResponse.GetResponseStream();
      StreamReader reader = new StreamReader(stream, System.Text.Encoding.Default);
      string str = reader.ReadToEnd();  //url返回的值 
      reader.Close();
      wResponse.Close();
    }

Python 简易接口：http://127.0.0.1:5000

from flask import Flask

#创建flask对象
app = Flask(__name__)

#创建路由'/'
@app.route('/')
def home():
  return "Hello,World!"
#当用户请求'/'资源时，回传"Hello,World!"

#启动flask，并设定端口为5000
app.run(port = 5000)

基于这种访问方式，就可以用C#调用机器学习等人工智能及其它python业务接口了...