有条件地从列表中获取总和 [英] Conditionally get the sum from a list

问题描述

我有一个类PropertyDetails:

I have a class PropertyDetails:

public class PropertyDetails 
{      
    public int Sequence { get; set; } 

    public int Length { get; set; }   

    public string Type { get; set; } 
} 

我创建的PropertyDetails列表为

I am creating a list of PropertyDetails as

List<PropertyDetails> propertyDetailsList = new List<PropertyDetails>();

我要从列表中的Length之和，其中PropertyDetails.Sequence< sumValue = 4

I want the sum of Length from the list where PropertyDetails.Sequence < sumValue=4

欢迎使用Linq解决方案.

Linq solutions are welcome.

推荐答案

序列小于4的长度的总和:

Sum of the Lengths where the Sequence is less than 4:

 var result = propertyDetailsList.Where(d => d.Sequence < 4)
                                 .Sum(d => d.Length);

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