HttpWebRequest使用例

snaptic.comのAPIがRESTで公開されているので、ASP.NETでアクセスする方法。
POST動作について、ASP.NETのHttpWebRequestを使ってサービスにパラメータを投げる方法を http://developer.yahoo.com/dotnet/howto-rest_cs.html#post から抜粋。

// We use the HttpUtility class from the System.Web namespace  
using System.Web;  
  
Uri address = new Uri("http://api.search.yahoo.com/ContentAnalysisService/V1/termExtraction");  
  
// Create the web request  
HttpWebRequest request = WebRequest.Create(address) as HttpWebRequest;  
  
// Set type to POST  
request.Method = "POST";  
request.ContentType = "application/x-www-form-urlencoded";  
  
// Create the data we want to send  
string appId = "YahooDemo";  
string context = "Italian sculptors and painters of the renaissance"  
                    + "favored the Virgin Mary for inspiration";  
string query = "madonna";  
  
StringBuilder data = new StringBuilder();  
data.Append("appid=" + HttpUtility.UrlEncode(appId));  
data.Append("&context=" + HttpUtility.UrlEncode(context));  
data.Append("&query=" + HttpUtility.UrlEncode(query));  
  
// Create a byte array of the data we want to send  
byte[] byteData = UTF8Encoding.UTF8.GetBytes(data.ToString());  
  
// Set the content length in the request headers  
request.ContentLength = byteData.Length;  
  
// Write data  
using (Stream postStream = request.GetRequestStream())  
{  
    postStream.Write(byteData, 0, byteData.Length);  
}  
  
// Get response  
using (HttpWebResponse response = request.GetResponse() as HttpWebResponse)  
{  
    // Get the response stream  
    StreamReader reader = new StreamReader(response.GetResponseStream());  
  
    // Console application output  
    Console.WriteLine(reader.ReadToEnd());  
}