Question

Dim objLab As New ArrayList

objLab有300个名称列表，我想选择名称是否为Telkom，但返回空记录。我试图在运气不好的情况下在堆栈上找到一些解决方案。

这就是我尝试过的Dim labQuery = From Laboratory In objLab Where Laboratory.Name = "Telkom" Select Laboratory

我也尝试过的

代码： vb.net LINQ select Distinct to a List

How to select last record in a LINQ GroupBy clause

Answer 1

尝试这个

Dim objLab As New ArrayList
objLab.Add("Abc")
objLab.Add("Telkom")
objLab.Add("StackOverFlow")

Dim labQuery = From item In objLab
               Where item.Equals("Telkom")
               Select item

Console.WriteLine("Results :")
For Each s In labQuery
    Console.WriteLine(s)
Next

Console.ReadLine()

…或

Dim objLab As New ArrayList From {
    New Labaratory(3, "Abc"),
    New Labaratory(2, "Telkom"),
    New Labaratory(3, "StackOverFlow")
}

Dim labQuery = From item As Labaratory In objLab
               Where item.Name.Equals("Telkom")
               Select item

Console.WriteLine("Results :")
For Each s In labQuery
    Console.WriteLine($"{s.Id} {s.Name}")
Next

Console.ReadLine()

您可以如下所示定义类实验室（Labaratory）

Public Class Labaratory
    Public Sub New(i As Integer, n As String)
        Id = i
        Name = n
    End Sub
    Public Property Id As Integer
    Public Property Name As String
End Class

如何在arraylist中选择记录vb.net linq

1 个答案: