asp.net中ashx后台接口获取Layui前台ajax传送过来的参数
后台代码：
//可以获取任何方式
string photoId = context.Request.Params["photoid"];
//POST方式传参
string photoId = context.Request.Form["photoid"];
//GET方式传参
string photoId = context.Request.QueryString["photoid"];
完整后台代码
ApiEditPhoto .ashx文件代码如下
<%@ WebHandler Language="C#" Class="ApiEditPhoto" %>
using System;
using System.Web;
using MyBlog.BLL;
using Newtonsoft.Json.Linq;
using System.IO;
public class ApiEditPhoto : IHttpHandler
{
AlbumService albumService = new AlbumService();
public void ProcessRequest(HttpContext context)
{
context.Response.ContentType = "application/json";
string photoId = context.Request.Params["photoid"];
string photoName = context.Request.Params["photoname"];
bool flag=albumService.updatePhoto(int.Parse(photoId),photoName);
JObject jo;
if(flag==true)
{
jo = new JObject(new JProperty("msg", "修改成功"));
}
else
{
jo = new JObject(new JProperty("msg", "修改失败"));
}
context.Response.Write(jo);
}
public bool IsReusable
{
get
{
return false;
}
}
}
ApiGetPhoto.ashx文件代码如下
<%@ WebHandler Language="C#" Class="ApiGetPhoto" %>
using System;
using System.Web;
using System.IO;
using System.Data;
using System.Text;
using Newtonsoft.Json;
using MyBlog.BLL;
using MyBlog.DAL;
using System.Collections.Generic;
using Newtonsoft.Json.Linq;
//获得所有photo表的信息
public class ApiGetPhoto : IHttpHandler
{
AlbumService albumService = new AlbumService();
public void ProcessRequest(HttpContext context)
{
context.Response.ContentType = "application/json";
string userid = "2";
List photoList = albumService.GetAllPhoto(int.Parse(userid));
string counts = photoList.Count.ToString();
//重点掌握json对象，注意引入Newtonsoft.Json.Linq和System.Collections.Generic
//注意layui中table返回数据的json格式如下，如果是自己独有的json格式，需要在
//table.render中添加parseData字段，详见官方文档
JObject res = new JObject();
res.Add(new JProperty("code", 0));
res.Add(new JProperty("msg", ""));
res.Add(new JProperty("count", counts));
JArray photos = new JArray();
foreach (var item in photoList)
{
JObject p = new JObject();
p.Add(new JProperty("photoId", item.photoId));
p.Add(new JProperty("photoName", item.photoName));
p.Add(new JProperty("photoUrl", item.photoUrl));
p.Add(new JProperty("photoTime", item.photoTime));
photos.Add(p);
}
res.Add(new JProperty("data", photos));
context.Response.Write(res);
}
public bool IsReusable
{
get
{
return false;
}
}
}
ApiAddPhoto.ashx文件代码如下
<%@ WebHandler Language="C#" Class="ApiAddPhoto" %>
using System;
using System.Web;
using System.IO;
using System.Data;
using System.Text;
using Newtonsoft.Json;
using MyBlog.BLL;
using Newtonsoft.Json.Linq;
public class ApiAddPhoto : IHttpHandler
{
AlbumService albumService=new AlbumService();
public void ProcessRequest(HttpContext context)
{
context.Response.ContentType = "application/json";
string savePath = HttpContext.Current.Server.MapPath("../UploadFiles/");
if (!System.IO.Directory.Exists(savePath))
{
System.IO.Directory.CreateDirectory(savePath);
}
HttpFileCollection hfc = context.Request.Files;
if (hfc.Count > 0)
{
HttpPostedFile hpf = context.Request.Files[0];
if (hpf.ContentLength > 0)
{
string fileName = Path.GetFileName(hpf.FileName);
savePath = savePath + "\\" + fileName;
hpf.SaveAs(savePath);
string path = string.Format("UploadFiles/{0}", fileName);
//法一
//string json = "{\"fileName\":\"" + path + "\"}";
//JObject jo = (JObject)JsonConvert.DeserializeObject(json);
//法二
JObject jObject=new JObject(new JProperty("fileName",path)) ;
context.Response.Write(jObject);
//获取当前时间
DateTime dateTime = DateTime.Now.ToLocalTime();
//插入数据库
albumService.insertPhoto(2, fileName, path, dateTime);
}
}
}
public bool IsReusable
{
get
{
return false;
}
}
}
ApiDeletePhoto.ashx文件代码如下
<%@ WebHandler Language="C#" Class="ApiDeletePhoto" %>
using System;
using System.Web;
using MyBlog.BLL;
using Newtonsoft.Json.Linq;
using System.IO;
public class ApiDeletePhoto : IHttpHandler
{
AlbumService albumService = new AlbumService();
public void ProcessRequest(HttpContext context)
{
context.Response.ContentType = "application/json";
string photoId = context.Request.Form["photoid"];
string url = albumService.delPhoto(int.Parse(photoId));
JObject jo;
if (url != null)
{//成功删除图片
string savePath = HttpContext.Current.Server.MapPath("../" + url);
File.Delete(savePath);
jo = new JObject(new JProperty("msg", "删除成功"));
}
else
{
jo = new JObject(new JProperty("msg", "删除失败"));
}
context.Response.Write(jo);
}
public bool IsReusable
{
get
{
return false;
}
}
}
前台完整代码
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="MyAlbum.aspx.cs" Inherits="MyAlbum" %>
BLL层服务操作类AlbumService.cs代码如下，MyBlogDataContext 为linq to sql类，是由数据库文件直接转换而来
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using MyBlog.DAL;
namespace MyBlog.BLL
{
public class AlbumService
{
MyBlogDataContext db = new MyBlogDataContext();
//插入图片
public void insertPhoto(int _userId,string _photoName,string _photoUrl,DateTime _dateTime)
{
photo photoItem = new photo
{
userId = _userId,
photoName = _photoName,
photoUrl = _photoUrl,
photoTime=_dateTime
};
db.photo.InsertOnSubmit(photoItem);
db.SubmitChanges();
}
public List GetAllPhoto(int _userId)
{
List photoList = new List();
var x=from r in db.photo
where r.userId==_userId
select r ;
photoList = x.ToList();
return photoList;
}
public string delPhoto(int _photoId)
{
var x = from r in db.photo
where r.photoId == _photoId
select r;
string pUrl=null;
foreach (var item in x)
{
pUrl = item.photoUrl;
}
db.photo.DeleteAllOnSubmit(x);
db.SubmitChanges();
return pUrl;//返回被删除图片的url，从而在服务器上对该图片进行删除
}
public bool updatePhoto(int _photoId,string _photoName)
{
bool flag = false;
var x = from r in db.photo
where r.photoId == _photoId
select r;
if(x!=null)
{
foreach (var item in x)
{
item.photoName = _photoName;
flag = true;
}
}
db.SubmitChanges();
return flag;
}
}
}
效果图如下
