jQuery的ajax 方法提交多个对象数组问题 C# traditional $.param

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!