C# 请求WebAPI

背景

最近项目中，由于需要把一个服务器的API接口，封装在另外一个服务器的应用中，这里就需要C#发起HttpRequest 进行数据请求。微软官方的文档中有了类似的例子，好像自己又不用费什么劲写了。提供了增删改查四种HTTP 操作的方法。
代码路径

改代码中用了HTTPCLIENT的类，HttpClient.aspx) 是用于进行数据请求和数据接收的一个基类

C# WebRequest 请求页面数据

简单请求

using System;
using System.IO;
using System.Net;
using System.Text;

namespace Examples.System.Net
{
    public class WebRequestGetExample
    {
        public static void Main ()
        {
            // Create a request for the URL. 		
            WebRequest request = WebRequest.Create ("http://www.contoso.com/default.html");
            // If required by the server, set the credentials.
            request.Credentials = CredentialCache.DefaultCredentials;
            // Get the response.
            HttpWebResponse response = (HttpWebResponse)request.GetResponse ();
            // Display the status.
            Console.WriteLine (response.StatusDescription);
            // Get the stream containing content returned by the server.
            Stream dataStream = response.GetResponseStream ();
            // Open the stream using a StreamReader for easy access.
            StreamReader reader = new StreamReader (dataStream);
            // Read the content.
            string responseFromServer = reader.ReadToEnd ();
            // Display the content.
            Console.WriteLine (responseFromServer);
            // Cleanup the streams and the response.
            reader.Close ();
            dataStream.Close ();
            response.Close ();
        }
    }
}

POST请求

using System;  
using System.IO;  
using System.Net;  
using System.Text;  

namespace Examples.System.Net  
{  
    public class WebRequestPostExample  
    {  
        public static void Main ()  
        {  
            // Create a request using a URL that can receive a post.   
            WebRequest request = WebRequest.Create ("http://www.contoso.com/PostAccepter.aspx ");  
            // Set the Method property of the request to POST.  
            request.Method = "POST";  
            // Create POST data and convert it to a byte array.  
            string postData = "This is a test that posts this string to a Web server.";  
            byte[] byteArray = Encoding.UTF8.GetBytes (postData);  
            // Set the ContentType property of the WebRequest.  
            request.ContentType = "application/x-www-form-urlencoded";  
            // Set the ContentLength property of the WebRequest.  
            request.ContentLength = byteArray.Length;  
            // Get the request stream.  
            Stream dataStream = request.GetRequestStream ();  
            // Write the data to the request stream.  
            dataStream.Write (byteArray, 0, byteArray.Length);  
            // Close the Stream object.  
            dataStream.Close ();  
            // Get the response.  
            WebResponse response = request.GetResponse ();  
            // Display the status.  
            Console.WriteLine (((HttpWebResponse)response).StatusDescription);  
            // Get the stream containing content returned by the server.  
            dataStream = response.GetResponseStream ();  
            // Open the stream using a StreamReader for easy access.  
            StreamReader reader = new StreamReader (dataStream);  
            // Read the content.  
            string responseFromServer = reader.ReadToEnd (); 

            //如果这里返回的是JSON数据，可以用NewtonSoft进行JSON转换成JObeject或者
            //其他类型。这样便于序列化
            // Display the content.  
            Console.WriteLine (responseFromServer);  
            // Clean up the streams.  
            reader.Close ();  
            dataStream.Close ();  
            response.Close ();  
        }  
    }  
}