Asp.net 利用Jquery Ajax传送和接收DataTable
对于习惯使用GridView的人来说，前台页面需要动态添加表格的行数，是一件痛苦的事。GridView处理这种事情相当麻烦，你点击“新增一行”，需要回传到服务器。服务器再把GridView反构造成DataTable, 再给DataTable增加一行之后，绑定到GridView，然后发回客户端...
能不能简单一点呢？
在使用Ajax数据请求数据，通常都是简单格式，比如String，信息量较少。当然也可以请求回XML，但是XML数据冗余多，取到客户端处理比json麻烦的多。
能不能简单一点呢？
上面这些问题，如果DataTable与JSON类型可以方便的相互转换，都可以迎刃而解了。
优点：1）避免不必要的回传；
2）精简异步请求数据的大小 ；
3）解决数据量较大时，数据发送与接收繁琐的问题。
既然好处这么多，我们上代码吧。
前台代码：
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
<script type="text/javascript" src="js/jquery-1.4.2.min.js"></script>
<script type="text/javascript" src="js/json2.js"></script>
<script type="text/javascript">
//onload
$(function() {
//点击botton1
$("#botton1").click(function() {
var url = "default.aspx?ajax=1";
var dtb = generateDtb();
//序列化对象
var postdata = JSON.stringify(dtb);
//异步请求
$.post(url, { json: postdata }, function(json) {
createTable(json);
}, "json")
});
});
//生成DataTable对象
function generateDtb() {
var dtb = new Array();
for (var i = 0; i < 10; i++) {
var row = new Object();
row.col1 = i;
row.col2 = i % 2 == 0 ? true : false;
row.col3 = i + "he\nll\"ow";
dtb.push(row);
}
return dtb;
}
//显示Json中的数据
function createTable(json) {
var table = $("<table border='1'></table>");
for (var i = 0; i < json.length; i++) {
o1 = json[i];
var row = $("<tr></tr>");
for (key in o1) {
var td = $("<td></td>");
td.text(o1[key].toString());
td.appendTo(row);
}
row.appendTo(table);
}
table.appendTo($("#back"));
}
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
<input id="botton1" type="button" value="button" />
<div id="back">
</div>
</div>
</form>
</body>
</html>
<head runat="server">
<title></title>
<script type="text/javascript" src="js/jquery-1.4.2.min.js"></script>
<script type="text/javascript" src="js/json2.js"></script>
<script type="text/javascript">
//onload
$(function() {
//点击botton1
$("#botton1").click(function() {
var url = "default.aspx?ajax=1";
var dtb = generateDtb();
//序列化对象
var postdata = JSON.stringify(dtb);
//异步请求
$.post(url, { json: postdata }, function(json) {
createTable(json);
}, "json")
});
});
//生成DataTable对象
function generateDtb() {
var dtb = new Array();
for (var i = 0; i < 10; i++) {
var row = new Object();
row.col1 = i;
row.col2 = i % 2 == 0 ? true : false;
row.col3 = i + "he\nll\"ow";
dtb.push(row);
}
return dtb;
}
//显示Json中的数据
function createTable(json) {
var table = $("<table border='1'></table>");
for (var i = 0; i < json.length; i++) {
o1 = json[i];
var row = $("<tr></tr>");
for (key in o1) {
var td = $("<td></td>");
td.text(o1[key].toString());
td.appendTo(row);
}
row.appendTo(table);
}
table.appendTo($("#back"));
}
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
<input id="botton1" type="button" value="button" />
<div id="back">
</div>
</div>
</form>
</body>
</html>
后台代码：
/// <summary>
/// 页面加载时
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
protected void Page_Load(object sender, EventArgs e)
{
//判断是否异步请求
if (Request.QueryString["ajax"] == "1")
{
ProcessRequest();
}
}
/// <summary>
/// 处理异步请求
/// </summary>
private void ProcessRequest()
{
Response.ContentType = "text/html";
string json = Request.Form["json"];
//反序列化DataTable
DataTable newdtb = Json2Dtb(json);
//序列化DataTable为JSON
string back = Dtb2Json(newdtb);
Response.Write(back);
Response.End();
}
/// <summary>
/// DataTable转Json
/// </summary>
/// <param name="dtb"></param>
/// <returns></returns>
private string Dtb2Json(DataTable dtb)
{
JavaScriptSerializer jss = new JavaScriptSerializer();
ArrayList dic = new ArrayList();
foreach (DataRow row in dtb.Rows)
{
Dictionary<string, object> drow = new Dictionary<string, object>();
foreach (DataColumn col in dtb.Columns)
{
drow.Add(col.ColumnName, row[col.ColumnName]);
}
dic.Add(drow);
}
return jss.Serialize(dic);
}
/// <summary>
/// Json转DataTable
/// </summary>
/// <param name="json"></param>
/// <returns></returns>
private DataTable Json2Dtb(string json)
{
JavaScriptSerializer jss = new JavaScriptSerializer();
ArrayList dic = jss.Deserialize<ArrayList>(json);
DataTable dtb = new DataTable();
if (dic.Count > 0)
{
foreach (Dictionary<string, object> drow in dic)
{
if (dtb.Columns.Count == 0)
{
foreach (string key in drow.Keys)
{
dtb.Columns.Add(key, drow[key].GetType());
}
}
DataRow row = dtb.NewRow();
foreach (string key in drow.Keys)
{
row[key] = drow[key];
}
dtb.Rows.Add(row);
}
}
return dtb;
}
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
protected void Page_Load(object sender, EventArgs e)
{
//判断是否异步请求
if (Request.QueryString["ajax"] == "1")
{
ProcessRequest();
}
}
/// <summary>
/// 处理异步请求
/// </summary>
private void ProcessRequest()
{
Response.ContentType = "text/html";
string json = Request.Form["json"];
//反序列化DataTable
DataTable newdtb = Json2Dtb(json);
//序列化DataTable为JSON
string back = Dtb2Json(newdtb);
Response.Write(back);
Response.End();
}
/// <summary>
/// DataTable转Json
/// </summary>
/// <param name="dtb"></param>
/// <returns></returns>
private string Dtb2Json(DataTable dtb)
{
JavaScriptSerializer jss = new JavaScriptSerializer();
ArrayList dic = new ArrayList();
foreach (DataRow row in dtb.Rows)
{
Dictionary<string, object> drow = new Dictionary<string, object>();
foreach (DataColumn col in dtb.Columns)
{
drow.Add(col.ColumnName, row[col.ColumnName]);
}
dic.Add(drow);
}
return jss.Serialize(dic);
}
/// <summary>
/// Json转DataTable
/// </summary>
/// <param name="json"></param>
/// <returns></returns>
private DataTable Json2Dtb(string json)
{
JavaScriptSerializer jss = new JavaScriptSerializer();
ArrayList dic = jss.Deserialize<ArrayList>(json);
DataTable dtb = new DataTable();
if (dic.Count > 0)
{
foreach (Dictionary<string, object> drow in dic)
{
if (dtb.Columns.Count == 0)
{
foreach (string key in drow.Keys)
{
dtb.Columns.Add(key, drow[key].GetType());
}
}
DataRow row = dtb.NewRow();
foreach (string key in drow.Keys)
{
row[key] = drow[key];
}
dtb.Rows.Add(row);
}
}
return dtb;
}
再附一个下载文件，觉得有用的可以下载看看
转自:http://www.cnblogs.com/gateluck/archive/2010/09/11/json.html
