如何在LINQ中对另一个字段进行求和？

Question

我正试图找到一个特定的RECIPE（所有成分）的所有QUANTITY到一个单一的值来获得总量的

假设我有以下数据集：

RecipeName IngredientName ReceiptWeight
Food1      Ingredient1    5
Food1      Ingredient2    2
Food2      Ingredient1    12
Food2      Ingredient3    1

我希望得到以下内容：

RecipeName ReceiptWeight
Food1      7
Food2      13

我到目前为止的代码是：

            Grouping =
                (
                from data in dataset
                group data by data.RecipeName into recipeGroup
                let fullIngredientGroups = recipeGroup.GroupBy(x => x.IngredientName)
                select new ViewFullRecipe()
                {
                    RecipeName = recipeGroup.Key,
                    ReceiptWeight = ????

如何获取RecipeWeight的值？ 谢谢，

Answer 1

LINQ确实有总和

from d in dataset
group d by new { d.RecipeName } into g
select new {
     g.Key.RecipeName,
     ReceiptWeight = g.sum(o => o.ReceiptWeight)
}