【C#】 通过http webRequest方式调用webservice

上一篇文章写了关于webservice的调用部署等内容，在上一篇文章中，我们通过微软给的方式--添加【WebReference服务引用】来进行调用如下图

那今天，我们说的是通过webrequest的方式进行接口调用，，废话少说了，，直接上代码截图（学习大神的说话方式--哈哈哈~~~）

具体步骤如下：

将参数写入Stream对象字节流

两种方式返回
第一种返回ReadInnerXml  ，，及xml中的值
第二种方式返回xml

第一种方式返回

第二种返回方式

今天的代码如下：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Net;
using System.IO;
using System.Xml;
using System.Web;

namespace WindowsFormsApp3
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

private void Form1_Load(object sender, EventArgs e)
        {

}

private void button1_Click(object sender, EventArgs e)
        {
            ////调用方法一:引用webservice

//WebReference.WebServiceDemo webservice = new WebReference.WebServiceDemo();
            //string a = textBox1.Text;
            //string b = textBox2.Text;
            //label1.Text = webservice.Add(a, b).ToString();

#region 通过http request调用

string url = "http://localhost:51270/WebServiceDemo.asmx";
            string method = "Add";
            string num1 = this.textBox1.Text;
            string num2 = this.textBox2.Text;

string result = string.Empty;
            string param = string.Empty;
            byte[] bytes = null;

Stream writer = null;
            HttpWebRequest request = null;
            HttpWebResponse response = null;

param = ("a") + "=" + (num1) + "&" + ("b") + "=" + (num2);
            bytes = Encoding.UTF8.GetBytes(param);

request = (HttpWebRequest)WebRequest.Create(url + "/" + method);
            request.Method = "POST";
            request.ContentType = "application/x-www-form-urlencoded";
            request.ContentLength = bytes.Length;

try
            {
                writer = request.GetRequestStream();  //获取用于写入请求数据的Stream对象
            }
            catch (Exception ex)
            {
                // return "";
            }

writer.Write(bytes, 0, bytes.Length);  //把参数数据写入请求数据流
            writer.Close();

try
            {
                response = (HttpWebResponse)request.GetResponse();  //获得响应
            }
            catch (WebException ex)
            {
                // return "";
            }

#region 这种方式读取到的是一个返回的结果字符串
            //Stream stream = response.GetResponseStream();  //获取响应流
            //XmlTextReader Reader = new XmlTextReader(stream);
            //Reader.MoveToContent();
            //result = Reader.ReadInnerXml();
            #endregion

#region 这种方式读取到的是一个Xml格式的字符串
            StreamReader reader = new StreamReader(response.GetResponseStream(), Encoding.UTF8);
            result = reader.ReadToEnd();
            #endregion

response.Dispose();
            response.Close();

reader.Close();
            reader.Dispose();

//Reader.Dispose();
            //Reader.Close();

//stream.Dispose();
            //stream.Close();

this.label1.Text = result;

#endregion

}
    }
}