本文整理匯總了VB.NET中System.Linq.Enumerable.LastOrDefault方法的典型用法代碼示例。如果您正苦於以下問題：VB.NET Enumerable.LastOrDefault方法的具體用法？VB.NET Enumerable.LastOrDefault怎麽用？VB.NET Enumerable.LastOrDefault使用的例子？那麽, 這裏精選的方法代碼示例或許可以為您提供幫助。
在下文中一共展示了Enumerable.LastOrDefault方法的3個代碼示例，這些例子默認根據受歡迎程度排序。您可以為喜歡或者感覺有用的代碼點讚，您的評價將有助於係統推薦出更棒的VB.NET代碼示例。
示例1: fruits
' Create an empty array.
Dim fruits() As String = {}
' Get the last item in the array, or a
' default value if there are no items.
Dim last As String = fruits.LastOrDefault()
' Display the result.
Console.WriteLine(IIf(String.IsNullOrEmpty(last),
"<string is Nothing or empty>",
last))輸出：
示例2: List
Dim daysOfMonth As New List(Of Integer)(New Integer() {})
' Setting the default value to 1 after the query.
Dim lastDay1 As Integer = daysOfMonth.LastOrDefault()
If lastDay1 = 0 Then
lastDay1 = 1
End If
Console.WriteLine($"The value of the lastDay1 variable is {lastDay1}")
' Setting the default value to 1 by using DefaultIfEmpty() in the query.
Dim lastDay2 As Integer = daysOfMonth.DefaultIfEmpty(1).Last()
Console.WriteLine($"The value of the lastDay2 variable is {lastDay2}")輸出：
The value of the lastDay1 variable is 1 The value of the lastDay2 variable is 1
示例3: numbers
' Create an array of doubles.
Dim numbers() As Double = {49.6, 52.3, 51.0, 49.4, 50.2, 48.3}
' Get the last item whose value rounds to 50.0.
Dim number50 As Double =
numbers.LastOrDefault(Function(n) Math.Round(n) = 50.0)
Dim output As New System.Text.StringBuilder
output.AppendLine("The last number that rounds to 50 is " & number50)
' Get the last item whose value rounds to 40.0.
Dim number40 As Double =
numbers.LastOrDefault(Function(n) Math.Round(n) = 40.0)
Dim text As String = IIf(number40 = 0.0,
"[DOES NOT EXIST]",
number40.ToString())
output.AppendLine("The last number that rounds to 40 is " & text)
' Display the output.
Console.WriteLine(output.ToString)輸出：
The last number that rounds to 50 is 50.2 The last number that rounds to 40 is [DOES NOT EXIST]