动态Linq Groupby SELECT键，List& T& [英] Dynamic Linq Groupby SELECT Key, List<T>

问题描述

我正在使用Dynamic Linq帮助程序对数据进行分组.我的代码如下:

I am using Dynamic Linq helper for grouping data. My code is as follows :

Employee[] empList = new Employee[6];
empList[0] = new Employee() { Name = "CA", State = "A", Department = "xyz" };
empList[1] = new Employee() { Name = "ZP", State = "B", Department = "xyz" };
empList[2] = new Employee() { Name = "AC", State = "B", Department = "xyz" };
empList[3] = new Employee() { Name = "AA", State = "A", Department = "xyz" };
empList[4] = new Employee() { Name = "A2", State = "A", Department = "pqr" };
empList[5] = new Employee() { Name = "BA", State = "B", Department = "pqr" };

var empqueryable = empList.AsQueryable();
var dynamiclinqquery  = DynamicQueryable.GroupBy(empqueryable, "new (State, Department)", "it");

如何从dynamiclinqquery中检索键和分组项目的相应列表，即IEnumerable {Key，List}?

How can I get back the Key and corresponding list of grouped items i.e IEnumerable of {Key, List} from dynamiclinqquery ?

推荐答案

我通过定义一个选择器来解决此问题，该选择器可同时显示键和员工列表.

I solved the problem by defining a selector that projects the Key as well as Employees List.

       var eq = empqueryable.GroupBy("new (State, Department)", "it").Select("new(it.Key as Key, it as Employees)");
       var keyEmplist = (from dynamic dat in eq select dat).ToList();

       foreach (var group in keyEmplist)
       {
           var key = group.Key;
           var elist = group.Employees;

           foreach (var emp in elist)
           {

           }                                          
       }

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