本文整理汇总了VB.NET中System.Linq.Queryable.Single方法的典型用法代码示例。如果您正苦于以下问题：VB.NET Queryable.Single方法的具体用法？VB.NET Queryable.Single怎么用？VB.NET Queryable.Single使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。
在下文中一共展示了Queryable.Single方法的2个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的VB.NET代码示例。
示例1: fruits1
' Create two arrays.
Dim fruits1() As String = {"orange"}
Dim fruits2() As String = {"orange", "apple"}
' Get the only item in the first array.
Dim result As String = fruits1.AsQueryable().Single()
' Display the result.
MsgBox("First query: " & result)
Try
' Try to get the only item in the second array.
Dim fruit2 As String = fruits2.AsQueryable().Single()
MsgBox("Second query: " + fruit2)
Catch
MsgBox("Second query: The collection does not contain exactly one element.")
End Try输出：
First query: orange Second query: The collection does not contain exactly one element.
示例2: fruits
Dim fruits() As String = _
{"apple", "banana", "mango", "orange", "passionfruit", "grape"}
' Get the only string in the array whose length is greater than 10.
Dim result As String = _
fruits.AsQueryable().Single(Function(fruit) fruit.Length > 10)
' Display the result.
MsgBox("First Query: " & result)
Try
' Try to get the only string in the array
' whose length is greater than 15.
Dim fruit2 As String = fruits.AsQueryable().Single(Function(fruit) fruit.Length > 15)
MsgBox("Second Query: " + fruit2)
Catch
Dim text As String = "Second Query: The collection does not contain "
text = text & "exactly one element whose length is greater than 15."
MsgBox(text)
End Try输出：
First Query: passionfruit Second Query: The collection does not contain exactly one element whose length is greater than 15.