当用$.ajax()向后台提交参数时,如果参数中数组的话一般在后台会用List<T>接收;但老是不成功如下面代码

var arr1=[{ "aa": "1", "bb": "2" }, { "aa": "3", "bb": "4"}];var arr2=[{ "aa": "1", "bb": "2" }, { "aa": "3", "bb": "4"}];function addUser(){        $.ajax({            url:'UserAdd',            data:{list1:arr1,list2:arr2},            type:'post',            success:function(msg){                if(msg=='1'){                    console.log('添加成功');                }else{                    console.log('添加失败')                }            }        });    }

用Fiddler 监测之后发觉数据变成啦

list1[0][aa]=1&list1[0][bb]=2&list1[1][aa]=3&list1[1][bb]=4&list2[0][aa]=1&list2[0][bb]=2&list2[1][aa]=3&list2[1][bb]=4

C#中能识别的数组应该是这样的格式

list1[0].aa=1&list1[0].bb=2&list1[1].aa=3&list1[1].bb=4&list2[0].aa=1&list2[0].bb=2&list2[1].aa=3&list2[1].bb=4

在网上查找资料之后了解到ajax post之前会用因为jQuery需要调用jQuery.param序列化参数,我们来看下jquery源码

//在ajax()方法中，对json类型的数据进行了$.param()处理if ( s.data && s.PRocessData && typeof s.data !== "string" ) {    s.data = jQuery.param( s.data, s.traditional );}//param方法中if ( jQuery.isArray( a ) || ( a.jquery && !jQuery.isPlainObject( a ) ) ) {        // Serialize the form elements        jQuery.each( a, function() {            add( this.name, this.value );        });    } else {        // If traditional, encode the "old" way (the way 1.3.2 or older        // did it), otherwise encode params recursively.        for ( prefix in a ) {            buildParams( prefix, a[ prefix ], traditional, add );        }    }

找到原因之后就好办啦

首先，traditional为false，我们可以通过设置traditional 为true阻止深度序列化

先写一个数组转为对象的方法:

            Array.prototype.serializeObject = function (lName) {                var o = {};                $t = this;                for (var i = 0; i < $t.length; i++) {                    for (var item in $t[i]) {                        o[lName+'[' + i + '].' + item.toString()] = $t[i][item].toString();                    }                }                return o;            };

var arr1=[{ "aa": "1", "bb": "2" }, { "aa": "3", "bb": "4"}];var arr2=[{ "aa": "1", "bb": "2" }, { "aa": "3", "bb": "4"}];function addUser(){        $.ajax({            url:'UserAdd',            data:$.param(arr1.serializeObject("list1"))+"&"+$.param(arr2.serializeObject("list2"),    //手动把数据转换拼接            type:'post',            traditional:true,    //这里必须设置            success:function(msg){                if(msg=='1'){                    console.log('添加成功');                }else{                    console.log('添加失败')                }            }        });    }

C#后台接收代码

    public class Test    {        public int aa{ get; set; }        public int bb{ get; set; }    }        public ActionResult UserAdd( List<Test> list1, List<Test> list2)        {                        return Json(amm);        }

这样一来问题就解决啦!