使用 .NET 2.0/VB.NET 中的谓词对列表（结构）中的项目进行计数

Question

我需要计算 .NET 2.0 中的 List(Of Structure) 中满足条件的项目。例如：

Dim listcars as New List(Of car)

Structure car
   Dim Name as String
   Dim year as Integer
End structure

现在我需要统计所有名称为丰田等的汽车。我该怎么做？

Answer 1

Dim toyotas As Integer = carList.Count(Function(c) c.Name = "Toyota")

Answer 2

您需要List.LongCount。

Dim CarList As New List(Of Car)
Dim Model As String = "Toyota"
Dim ToyotaCount As Long = CarList.LongCount(Function(car) car.Name = Model)

Answer 3

干得好。

 var count = carList.Count(x => x.Name == "Toyota");

Answer 4

语法明显错误，但类似这样：

Dim toyotas as Integer;
toyotas = 0;
foreach(car c in listcars){
    if(c.Name == "toyota")//make sure to do string comparison here.
        toyotas++;
}