.net 对外访问接口

方法一：.net 访问ashx

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Net;
using System.Text;
using System.IO;

public partial class _Default : System.Web.UI.Page 
{

    protected void Page_Load(object sender, EventArgs e)
    {
        string strUrl = "http://192.168.199.192/Ajax/Handler.ashx?Test='123'";
        string content = HTTPSendingHelper.SendRequest(strUrl, Encoding.UTF8);
        lblTest.Text = content;
    }
}

public class HTTPSendingHelper
{
    /// <summary>   
    /// Get方式获取url地址输出内容   
    /// </summary> /// <param name="url">url</param>   
    /// <param name="encoding">返回内容编码方式，例如：Encoding.UTF8</param>   
    public static String SendRequest(String url, Encoding encoding)
    {
        HttpWebRequest webRequest = (HttpWebRequest)WebRequest.Create(url);
        webRequest.Method = "GET";
        HttpWebResponse webResponse = (HttpWebResponse)webRequest.GetResponse();
        StreamReader sr = new StreamReader(webResponse.GetResponseStream(), encoding);
        return sr.ReadToEnd();
    }
}

方法二：Ajax跨域访问ashx

禁止跨域实际上是浏览器对访问做的安全策略