VB.NET LINQ查询:获取特定结构成员的所有值的总和
发布时间:2020-12-17 00:10:31 所属栏目:大数据 来源:网络整理
导读:在VB.NET中,我们假设我有以下结构: Public Structure Product Public ItemNo As Int32 Public Description As String Public Cost As DecimalEnd Structure …和产品的通用列表: Dim ProductsList As New List(Of Product)Dim product1 As New ProductWith
在VB.NET中,我们假设我有以下结构:
Public Structure Product Public ItemNo As Int32 Public Description As String Public Cost As Decimal End Structure …和产品的通用列表: Dim ProductsList As New List(Of Product) Dim product1 As New Product With product1 .ItemNo = 100 .Description = "Standard Widget" .Cost = 10D End With ProductsList.Add(product1) Dim product2 As New Product With product2 .ItemNo = 101 .Description = "Standard Cog" .Cost = 10.95D End With ProductsList.Add(product2) Dim product3 As New Product With product3 .ItemNo = 101 .Description = "Industrial Strenght Sprocket" .Cost = 99.95D End With ProductsList.Add(product3) 我如何定义一个LINQ查询以求列表中的所有Product.Cost值?换句话说,什么是LINQ
内置Sum方法已经这样做了.
在VB中,它看起来像这样: ProductList.Sum(Function(item) item.Cost) 在C#中,它看起来像这样: ProductsList.Sum( (item) => item.Cost); (编辑:李大同) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |