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;
}
