C# 调用webapi 总结

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mob60475703f08d 2021-10-13 15:18:00

文章标签 html post请求 xml 带参数 json 文章分类 代码人生

以下是学习笔记：

一，HttpWebRequest方式

1，WebRequest方式 Get请求

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28	`#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`

　　 C# 调用webapi 总结_带参数

2，WebRequest方式 Get带参数请求

1 2 3 4 5 6 7 8 9 10 11	`#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`

　 C# 调用webapi 总结_json_02

3，WebRequest方式 Post请求

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47	`#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`

　　 C# 调用webapi 总结_html_03

4，HttpWebRequest方式 Delete请求：

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35	`#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` `}` `}`

　　 C# 调用webapi 总结_带参数_04

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

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17	`#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

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32	`#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

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26	`#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

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40	`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：

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15	`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：

1 2 3 4 5 6 7 8	`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：

1 2 3 4 5 6 7 8	`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;` `}`