Winform C#客户端调用接口方法封装

Winform C#客户端调用接口方法封装

编码中，偶尔需要调用其他方提供的API或者其他端交互的API。封装了常用的调用的get请求与post的请求。

接口返回值为Json，复制返回值通过VisualStudio 【编辑】--》【选择性粘贴】--》【将Json粘贴为类】可以自动生成返回结果类，类型可以修改为有意义的，但是字段属性不能修改，要与接口返回一致。通过json序列化，将结果序列化为可用的对象。

需要引用：

using Newtonsoft.Json;

using System;
using System.Collections.Generic;
using System.Text;
using Microsoft.Win32;
using System.Net;
using System.IO;
using Newtonsoft.Json;
using System.Collections.Specialized;

namespace SmartDP.Common.Utils
{
    public class CallInterfaceDemo
    {
        /// 

        /// Get 请求 返回Json
        /// 
        /// 
        /// 
        /// 
        /// 
        public T GetInterfaceDemo(string url, Dictionary dicParams)
        {
            T t1 = default(T);

            StringBuilder sbUrl = new StringBuilder();
            string result = "";
            try
            {
                //拼接访问地址
                sbUrl.Append(url);
                //拼接get接口的参数
                int i = 0;
                foreach (var key in dicParams.Keys)
                {
                    if (i == 0)
                    {
                        sbUrl.Append("?" + key+"=").Append(dicParams[key]);
                    }
                    else
                    {
                        sbUrl.Append("&" + key + "=").Append(dicParams[key]);
                    }
                    i++;
                }

                //网络接口请求
                HttpWebRequest request = (HttpWebRequest)WebRequest.Create(sbUrl.ToString());
                request.Method = "GET";
                request.Accept = "text/html, application/xhtml+xml, */*";
                HttpWebResponse response = (HttpWebResponse)request.GetResponse();
                using (StreamReader reader = new StreamReader(response.GetResponseStream()))
                {
                    result = reader.ReadToEnd();
                }

                t1 = JsonConvert.DeserializeObject(result);
              
                return t1;
                

            }
            catch (Exception ex)
            {
                return t1;

            }

        }
        /// 

        /// 调用post的接口 ContentType='multipart/form-data'
        /// 
        /// 
        /// 
        /// 
        /// 
        public string PostDemo(string url, Dictionary dicParams, List filepaths)
        {
            string postUrl = url;
            try
            {
                // 拼接同文件一同上传的表单文本域及值（即传入的参数）
                NameValueCollection nvc = new NameValueCollection();
                foreach (var key in dicParams.Keys)
                {
                    nvc.Add(key, dicParams[key]);
                }

                StringBuilder sb = new StringBuilder();
                string boundary = "----------------" + DateTime.Now.Ticks.ToString("x");  // 边界符

                HttpWebRequest httpWebRequest = (HttpWebRequest)WebRequest.Create(url);   // 由于HttpWebRequest没有提供属性来方便传参，所以下面我们只能自己模拟传参
                httpWebRequest.ContentType = "multipart/form-data; boundary=" + boundary; // 声明数据类型
                httpWebRequest.Method = "POST";
                httpWebRequest.KeepAlive = true;
                httpWebRequest.Credentials = System.Net.CredentialCache.DefaultCredentials;

                Stream memStream = new System.IO.MemoryStream();

                string formdataTemplate = "\r\n--" + boundary + "\r\nContent-Disposition: form-data; name=\"{0}\"\r\n\r\n{1}"; // key就是{0},value是{1}
                foreach (string key in nvc.Keys)
                {
                    string formitem = string.Format(formdataTemplate, key, nvc[key]);
                    sb.Append(formitem);
                    byte[] formitembytes = System.Text.Encoding.UTF8.GetBytes(formitem);
                    memStream.Write(formitembytes, 0, formitembytes.Length);
                }

                // 这里key是{0},value是{1}
                string headerTemplate = "\r\n--" + boundary + "\r\nContent-Disposition: form-data; name=\"{0}\"; filename=\"{1}\"\r\nContent-Type: application/octet-stream\r\n\r\n";
                

                // 逐个将文件内容写入流
                for (int i = 0; i < filepaths.Count; i++)
                {
                    FileInfo fi = new FileInfo(filepaths[i]);

                    // 写入文件开始标记
                    string header = string.Format(headerTemplate, "file", fi.Name);
                    sb.Append(header);
                    byte[] headerbytes = System.Text.Encoding.UTF8.GetBytes(header);
                    memStream.Write(headerbytes, 0, headerbytes.Length);

                    FileStream fileStream = new FileStream(fi.FullName, FileMode.Open, FileAccess.Read);

                    byte[] buffer = new byte[1024 * 8];//每次上传8M

                    int bytesRead = 0;
                    // 写入文件内容
                    while ((bytesRead = fileStream.Read(buffer, 0, buffer.Length)) != 0)
                    {
                        memStream.Write(buffer, 0, bytesRead);
                    }
                    fileStream.Close();
                }
                sb.Append("\r\n--" + boundary + "--\r\n");
                // 将结束标记写入内存流
                byte[] boundarybytes = System.Text.Encoding.ASCII.GetBytes("\r\n--" + boundary + "--\r\n");
                memStream.Write(boundarybytes, 0, boundarybytes.Length);

                httpWebRequest.ContentLength = memStream.Length;//流总大小

                Stream requestStream = httpWebRequest.GetRequestStream();

                memStream.Position = 0;
                byte[] tempBuffer = new byte[memStream.Length];
                memStream.Read(tempBuffer, 0, tempBuffer.Length);
                memStream.Close();
                requestStream.Write(tempBuffer, 0, tempBuffer.Length);
                requestStream.Close();

                WebResponse webResponse = httpWebRequest.GetResponse();
                Stream stream = webResponse.GetResponseStream();
                StreamReader reader = new StreamReader(stream);
                string ret = reader.ReadToEnd();

                return ret;
            }
            catch (Exception ex)
            {

                return "{\"result\":\"99\",\"message\":\"调用外部接口发生异常(" + ex.Message + ")\",\"data\":null}";
            }

        }

        

    }
}