常见Linq表达式的示例 [英] Examples of Common Linq Expressions

问题描述

在编写代码时，我开始确定可以使用Linq的那些地方.我的问题是我对语法还是很陌生.我通过示例学习得最好，但是似乎无法轻松找到所需的示例.

When I'm writing code, I'm starting to identify those places where I could use Linq. My problem is that I'm still very new to the syntax. I learn best through examples, but I can't seem to easily find the example I need.

我想启动此线程来创建一个常见的Linq表达式的存储库，其他人可能会通过Google偶然发现它们.

I wanted to start this thread to create a repository of common Linq expressions that others could stumble upon via google.

问题:您能否提供用于常见任务的Linq表达式的任何示例?

The question: can you provide any examples of Linq expressions you use for common tasks?

例如，我已经写了以下内容:

For example, I've already written the following:

• 搜索列表
• 求和数组
• 对元素集合中的某个属性求和

要启动线程，我将发布包含这些内容的答案.

To get the thread started, I'll post an answer that contains these.

推荐答案

枚举列表以查找特定元素

Enumerating through a list to find a certain element

tboShippingLotNumber existingLotNumber =
    (tboShippingLotNumber)(from lot in shipmentDetailLine.LotNumbers
                           where 
                               (lot.LotNumber == lotNumber) &&
                               (lot.ShipLineKey == shipmentDetailLine.Key)
                           select lot).ElementAtOrDefault(0);

if (existingLotNumber == null)
{
    // not found exception
}

对数组求和:

decimal[] array = { 1.5m, 2.5m, 3.5m };
decimal sum = array.Sum();

总结对象列表中的某个属性

Summing a certain property in a list of objects

decimal sum = (from shipment in _ShipmentData.Shipments select 
    shipment.AmountShipped).Sum()

这篇关于常见Linq表达式的示例的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！