[英]How to group IList<T> using LINQ?
public static IList<string> GetAttribute_1(ModelContainer context, long productcatid)
{
var query = from product in context.Products
where product.ProductCategory_Id == productcatid
select product.Attribute_1;
return query.ToList();
}
how do i group by product.Attribute_1? 如何按product.Attribute_1分组?
from product in context.Products
where product.ProductCategory_Id == productcatid
group product by product.Attribute_1 into g
select g;
group product by product.Attribute_1 into g
Grouping can be done by using the group by linq operator. 可以使用linq运算符进行分组。
The syntax would be something like: 语法类似于:
var query = from product in context.Products
where product.ProductCategory_Id == productcatid
group product by prodyct.Attribute_1 into g
select new { Attribute_1 = g.Key, Products = g };
Here you can find Linq samples for grouping. 在这里,您可以找到用于分组的Linq样本。
But I suppose you want all the unqiue Attribute_1 properties returned from your function? 但是我想您希望从函数中返回所有unqiue Attribute_1属性?
You could then use the Distinct operator. 然后,您可以使用Distinct运算符。 That will fiter your list of Attribute_1 strings to contain only unique values. 这将适合您的Attribute_1字符串列表,使其仅包含唯一值。
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.