Ext.onReady(function () {new Ext.Button({renderTo: "div1",text: "后台Ajax提交",handler: function () {Ext.Ajax.request({url: 'Ajax_Func1',headers: {'userHeader': 'userMsg'},params: { a: 10, b: 20 },method: 'GET',success: function (response, options) {Ext.MessageBox.alert('成功', '从服务端获取结果: ' + response.responseText);},failure: function (response, options) {Ext.MessageBox.alert('失败', '请求超时或网络故障,错误编号：' + response.status);}});},id: "bt1"});});

public ContentResult Ajax_Func1(int a, int b)
{string userHeaderMsg = Convert.ToString(Request.Headers["userHeader"]);return Content((a + b).ToString() + "，userHeader：" + userHeaderMsg);
}

Ext.onReady(function () {new Ext.Button({renderTo: "div1",text: "后台Ajax提交方式2返回JSON",handler: function () {Ext.Ajax.request({url: 'Ajax_Func2',params: { n: 10 },method: 'POST',callback: function (options, success, response) {if (success) {var responseJson = Ext.JSON.decode(response.responseText);Ext.Msg.alert("成功", options.params.n + "的阶乘是：<font color='red'>" + responseJson.n1 + "</font><br />"+ options.params.n + "的累加是：<font color='red'>" + responseJson.n2 + "</font>");} else {Ext.Msg.confirm('失败','请求超时或网络故障,错误编号：[' + response.status + ']是否要重新发送？', function (btn) {if (btn == 'yes') {Ext.Ajax.request(options);}});}}});}});});

//文件上传
Ext.get("button1").on("click", function () {Ext.Ajax.request({url: "Ajax_FileUp",isUpload: true,form: "form1",success: function (response) {Ext.MessageBox.alert("上传成功，文本文件内容：", response.responseText);}});
});

public ContentResult Ajax_FileUp(HttpPostedFileBase file)
{System.IO.StreamReader r = new System.IO.StreamReader(file.InputStream, System.Text.UTF8Encoding.Default);var str = r.ReadToEnd();return Content(str);
}

var ajaxCount = 0;
//每当Ajax请求发起时触发：
Ext.Ajax.on('beforerequest', function () { Ext.get("span1").update(++ajaxCount) }, this);