请问怎么传两组Json到后台c#啊

怎么传两组Json到后台啊

        var userList = [];
        userList.push({ _strOptionalID: 1, _dtStartDate: "2017-05-01", _dtEndDate: "2017-05-04"});
        userList.push({ _strOptionalID: 1, _dtStartDate: "2017-05-01", _dtEndDate: "2017-05-05"});
        userList.push({ _strOptionalID: 1, _dtStartDate: "2017-05-01", _dtEndDate: "2017-05-06"});
        userList.push({ _strOptionalID: 1, _dtStartDate: "2017-05-01", _dtEndDate: "2017-05-07" });
        var idList = [];
        idList.push({ _strOptionalID: 1, _dtStartDate: "2017-05-01", _dtEndDate: "2017-05-04" });
        idList.push({ _strOptionalID: 1, _dtStartDate: "2017-05-01", _dtEndDate: "2017-05-05" });
        idList.push({ _strOptionalID: 1, _dtStartDate: "2017-05-01", _dtEndDate: "2017-05-06" });
        idList.push({ _strOptionalID: 1, _dtStartDate: "2017-05-01", _dtEndDate: "2017-05-07" });
                        $.ajax({
            url: '/Home/Index',
            type: 'post',
            contentType: 'application/json',
            data: JSON.stringify(userList),
            async:true,
            error: function (XMLHttpRequest, textStatus, errorThrown)
            {
                alert("数据错误!");
            },
            success: function (data)
            {
                if (data)
                    alert("保存成功!");
                else (data)
                alert("保存失败，请联系管理员!");
            }
        });

List> userList 你这个结构和你客户端js的数据结构不一致啊。。
应该是[["2017-05-26","2017-05-26","1","1"],["2017-05-25","2017-05-25","1","1"]]这种结构才能接收，如果你确认userList和idList需要建立类来接受，如下面的

 public class Item{
public int _strOptionalID;
public string _dtStartDate,_dtEndDate;
}
pubic class MyObj{public  List<item> userList ,idList ;}

 public bool Index( List<List<string>> userList ）
 ==>
  public bool Index( MyObj obj）


     var userList = [];
        userList.push({ _strOptionalID: 1, _dtStartDate: "2017-05-01", _dtEndDate: "2017-05-04"});
        userList.push({ _strOptionalID: 1, _dtStartDate: "2017-05-01", _dtEndDate: "2017-05-05"});
        userList.push({ _strOptionalID: 1, _dtStartDate: "2017-05-01", _dtEndDate: "2017-05-06"});
        userList.push({ _strOptionalID: 1, _dtStartDate: "2017-05-01", _dtEndDate: "2017-05-07" });
        var idList = [];
        idList.push({ _strOptionalID: 1, _dtStartDate: "2017-05-01", _dtEndDate: "2017-05-04" });
        idList.push({ _strOptionalID: 1, _dtStartDate: "2017-05-01", _dtEndDate: "2017-05-05" });
        idList.push({ _strOptionalID: 1, _dtStartDate: "2017-05-01", _dtEndDate: "2017-05-06" });
        idList.push({ _strOptionalID: 1, _dtStartDate: "2017-05-01", _dtEndDate: "2017-05-07" });
                        $.ajax({
            url: '/Home/Index',
            type: 'post',
            contentType: 'application/json',
            data: JSON.stringify({userList:userList,idList:idList}),///////////////

data:{ list1:JSON.stringify(userList),
list2:JSON.stringify(idList)
}

你的ajax是把集合变成json 的字符串形式，在后台应该可以用String list1 ，String list2 去接收在通过json转变成list对象应该可以