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C#--调用WebApi--（Get,Post,Put,Delete请求总结）

以下是学习笔记：

一，HttpWebRequest方式

1，WebRequest方式 Get请求

#region 方法3 .WebRequest方式 Get请求
public static string HttpWebRequest_Get(string url)
{
    //ServicePointManager.ServerCertificateValidationCallback = new RemoteCertificateValidationCallback(CheckValidationResult);
    Encoding encoding = Encoding.UTF8;
 
    //构造一个Web请求的对象
    HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
    request.Method = "GET";
    request.Accept = "text/html, application/xhtml+xml, */*";
    request.ContentType = "application/json";
 
    //获取web请求的响应的内容
    HttpWebResponse response = (HttpWebResponse)request.GetResponse();
 
    using (StreamReader reader = new StreamReader(response.GetResponseStream(), Encoding.UTF8))
    {
        return reader.ReadToEnd();
    }
}
private void button3_Click(object sender, EventArgs e)
{
    //string ss = HttpWebRequest_Get("http://localhost:55837/api/product");
    string ss = HttpWebRequest_Get(txt_get_url.Text);
    this.textBox3.Text += ss;
}
 
#endregion

2，WebRequest方式 Get带参数请求

#region WebRequest方式 Get带参数请求
 
private void button6_Click(object sender, EventArgs e)
{
    string id = this.txt_get_parameter.Text;
    string ss = HttpWebRequest_Get(txt_get_url.Text+ "?"+id.Trim());//带参数
    this.textBox6.Text += ss;
}
 
 
#endregion

3，WebRequest方式 Post请求

#region 方法3 WebRequest方式 Post请求
 
public static string HttpWebRequest_Post(string url, string body)
{
    //ServicePointManager.ServerCertificateValidationCallback = new RemoteCertificateValidationCallback(CheckValidationResult);
    Encoding encoding = Encoding.UTF8;
    HttpWebRequest request = (HttpWebRequest) WebRequest.Create(url);
    request.Method = "POST"; //Post请求方式
    request.Accept = "text/html, application/xhtml+xml, */*";
    // 内容类型
    //request.ContentType = "application/json";//参数格式:  {username:"admin",password:"123} 如果参数不是json类型会报错
    request.ContentType =
        "application/x-www-form-urlencoded"; //参数：username=admin&password=123 如果参数是json格式或者参数写错不会报错的
 
    byte[] buffer = encoding.GetBytes(body);
    request.ContentLength = buffer.Length;
    request.GetRequestStream().Write(buffer, 0, buffer.Length);
 
    //HttpWebResponse response = (HttpWebResponse)request.GetResponse();
    //上面的代码会有异常出现，更改如下：
 
    HttpWebResponse response;
    try
    {
        response = (HttpWebResponse)request.GetResponse();
    }
    catch (WebException ex)
    {
        response = (HttpWebResponse)ex.Response;
    }
 
 
    using (StreamReader reader = new StreamReader(response.GetResponseStream(), Encoding.UTF8))
    {
        return reader.ReadToEnd();
    }
}
 
private void button4_Click(object sender, EventArgs e)
{
    string url = this.txt_post_url.Text;
    string body = this.txt_post_parameter.Text;
    string ss = HttpWebRequest_Post(url, body);
    this.textBox4.Text += ss;
}
 
#endregion

4，HttpWebRequest方式 Delete请求：

#region WebRequest方式 Delete请求
       /// <summary>
       ///  API发送DELETE请求，返回状态：200成功，201失败
       /// </summary>
       /// <param name="url"></param>
       /// <returns></returns>
       public static string HttpWebRequest_Delete(string url)
       {
           //Web访问对象64
           //string serviceUrl = string.Format("{0}/{1}", this.BaseUri, uri);
           string serviceUrl = url;
           HttpWebRequest myRequest = (HttpWebRequest)WebRequest.Create(serviceUrl);
           myRequest.Method = "DELETE";
           // 获得接口返回值68
           HttpWebResponse myResponse = (HttpWebResponse)myRequest.GetResponse();
           StreamReader reader = new StreamReader(myResponse.GetResponseStream(), Encoding.UTF8);
           //string ReturnXml = HttpUtility.UrlDecode(reader.ReadToEnd());
           string ReturnXml = reader.ReadToEnd();
           reader.Close();
           myResponse.Close();
           return ReturnXml;
       }
 
       private void button7_Click(object sender, EventArgs e)
       {
           if (txt_delete_parameter.Text.Trim().Length > 0)
           {
               HttpWebRequest_Delete(txt_delete_rul.Text+"?"+txt_delete_parameter.Text);//带参数删除
           }
           else
           {
               HttpWebRequest_Delete(txt_delete_rul.Text);//全部删除
           }
            
       }

5，HttpWebRequest方式 Put请求：

见下面的通用方法

二，HttpClient 方式

1，HttpClient 方式 Get请求

#region 方法4 HttpClient 方式 Get请求
 
      public static string HttpClienGet(string url)
      {
          HttpClient hc = new HttpClient();
          string html= hc.GetStringAsync(url).Result;
          return html;
      }
 
      private void btn_HttpClentGet_Click(object sender, EventArgs e)
      {
          string url = this.txt_get_url.Text;
          string html = HttpClienGet(url);
          txt_HttpClentGet_Result.Text += html;
      }
 
      #endregion

2，HttpClient 方式 Post请求

#region 方法4 HttpClient 方式 Post请求
 
public static async void HttpClientPost(string url)
{
    var handler = new HttpClientHandler() { AutomaticDecompression = DecompressionMethods.None };
 
    using (var httpclient = new HttpClient(handler))
    {
        httpclient.BaseAddress = new Uri(url);
        var content = new FormUrlEncodedContent(new Dictionary<string, string>()
        {
            {"name", "杜宗英"},
            {"age", "18"},
            {"gender","false" }
        });
 
        var  response = await httpclient.PostAsync(url, content);
 
        string responseString = await response.Content.ReadAsStringAsync();
        MessageBox.Show(responseString);
    }
}
 
 
 
private void button5_Click(object sender, EventArgs e)
{
    string url = this.txt_post_url.Text;
    HttpClientPost(url);
 
}
#endregion

三，WebClient 方式

1，WebClient方式 Post请求

#region WebClient方式 Post请求
/// <summary>
/// 
/// </summary>
/// <param name="url"></param>
/// <param name="body">传递的参数</param>
/// <returns></returns>
public static string WebClientPost(string url,string body)
{
    byte[] postData = Encoding.UTF8.GetBytes(body);//编码，尤其是汉字，事先要看下抓取网页的编码方式
    WebClient webClient=new WebClient();
    webClient.Headers.Add("Content-Type", "application/x-www-form-urlencoded");//采取POST方式必须加的header，如果改为GET方式的话就去掉这句话即可
    byte[] responseData = webClient.UploadData(url, "POST", postData);//得到返回字符流  
    string srcString = Encoding.UTF8.GetString(responseData);//解码 
    return srcString;
}
 
private void btn_WebClient_Post_Click(object sender, EventArgs e)
{
    string url = this.txt_post_url.Text;
    string body = this.txt_post_parameter.Text;
    string srcString = WebClientPost(url, body);
    this.txt_WebClient_Post.Text += srcString;
}
 
#endregion

四，HttpWebRequest通用方法

public string CommonHttpWebRequest(string data, string uri, string type)
{
    //Web访问对象，构造请求的url地址
    //string serviceUrl = string.Format("{0}/{1}", this.BaseUri, uri);
    string serviceUrl = uri;
 
    //构造http请求的对象
    HttpWebRequest request = (HttpWebRequest)WebRequest.Create(serviceUrl);
    //转成网络流
    byte[] buf = System.Text.Encoding.GetEncoding("UTF-8").GetBytes(data);
    //设置
    request.Method = type;
    request.ContentLength = buf.Length;
    //myRequest.ContentType = "application/json";//如果参数不是json格式会报错
    request.ContentType ="application/x-www-form-urlencoded";
    request.MaximumAutomaticRedirections = 1;
    request.AllowAutoRedirect = true;
    // 发送请求
    Stream newStream = request.GetRequestStream();
    newStream.Write(buf, 0, buf.Length);
    newStream.Close();
    // 获得接口返回值
    //HttpWebResponse myResponse = (HttpWebResponse)myRequest.GetResponse();
    //上面的代码会有异常出现，更改如下：
 
    HttpWebResponse response;
    try
    {
        response = (HttpWebResponse)request.GetResponse();
    }
    catch (WebException ex)
    {
        response = (HttpWebResponse)ex.Response;
    }
    StreamReader reader = new StreamReader(response.GetResponseStream(), Encoding.UTF8);
    string ReturnXml = reader.ReadToEnd();
    reader.Close();
    response.Close();
    return ReturnXml;
}

　　1，Delete请求代码：

private void btn_webapi_delete_Click(object sender, EventArgs e)
{
    string url = txt_delete_rul.Text;
    string data = txt_delete_parameter.Text;
 
    if (data.Trim().Length > 0)
    {
        CommonHttpWebRequest(data, url + "?" + data, "DELETE");//带参数删除
    }
    else
    {
        CommonHttpWebRequest(data, url, "DELETE"); ;//全部删除
    }
     
}

　　2，Post请求代码：

private void btn_webapi_post_Click(object sender, EventArgs e)
{
    string url = txt_post_url.Text;
    string data = txt_post_parameter.Text;
 
    string res = CommonHttpWebRequest(data, url, "POST");
    this.txt_webapi_get_data.Text += res;
}

　　3，Put 请求代码：

private void btn_webapi_put_Click(object sender, EventArgs e)
{
    string url = txt_put_url.Text;
    string data = txt_put_parameter.Text;
 
    string res = CommonHttpWebRequest(data, url, "PUT");
    this.txt_webapi_get_data.Text += res;
}