相关疑难解决方法(0)

假设我有一个包含四列的DataTable,Company(字符串),Fund(字符串),State(字符串),Value(double):

    table1.Rows.Add("Company 1","Fund 1","NY",100));
    table1.Rows.Add("Company 2","Fund 1","CA",200));
    table1.Rows.Add("Company 3","Fund 1","FL",300));
    table1.Rows.Add("Company 4","Fund 2","CA",400));
    table1.Rows.Add("Company 5","Fund 1","NY",500));
    table1.Rows.Add("Company 6","Fund 2","CA",600));
    table1.Rows.Add("Company 7","Fund 3","FL",700));

我想使用System.LINQ.Dynamic构建一个动态查询,该查询在公司,基金或州上分组,然后按条件选择我的组作为第一列,并且sum(value):

string groupbyvalue="Fund";
var q1= table1.AsEnumerable().AsQueryable()
              .GroupBy(groupbyvalue,"it")
              .Select("new ("+groupbyvalue+" as Group, Sum(Value) as TotalValue)");

在上面的查询中,所选的groupbyvalue(Group)将始终是一个字符串,并且总和将始终为double,因此我希望能够转换为类似List的内容,其中Result是具有属性Group的对象(字符串) )和TotalValue(双).

我遇到很多麻烦,有人可以解决这个问题吗？