首先，建个ajax

再建个一般处理程序

DataContractJsonSerializer所在的 命名空间是这个  System.Runtime.Serialization.Json;

public class student : IHttpHandler{    public void ProcessRequest(HttpContext context)    {         context.Response.ContentType = "application/json";        DBHelper manager = new DBHelper();            List
     
       students = manager.getAllStudent();        DataContractJsonSerializer json = new DataContractJsonSerializer(students.GetType());        json.WriteObject(context.Response.OutputStream, students);     }    public bool IsReusable    {        get        {            return false;        }    }}
     

然后是效果图