本文整理汇总了VB.NET中System.Collections.Specialized.NameObjectCollectionBase.BaseHasKeys方法的典型用法代码示例。如果您正苦于以下问题：VB.NET NameObjectCollectionBase.BaseHasKeys方法的具体用法？VB.NET NameObjectCollectionBase.BaseHasKeys怎么用？VB.NET NameObjectCollectionBase.BaseHasKeys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。您也可以进一步了解该方法所在类System.Collections.Specialized.NameObjectCollectionBase的用法示例。
在下文中一共展示了NameObjectCollectionBase.BaseHasKeys方法的1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: MyCollection
' 导入命名空间
Imports System.Collections
Imports System.Collections.Specialized
Public Class MyCollection
Inherits NameObjectCollectionBase
Private _de As New DictionaryEntry()
' Gets a key-and-value pair (DictionaryEntry) using an index.
Default Public ReadOnly Property Item(index As Integer) As DictionaryEntry
Get
_de.Key = Me.BaseGetKey(index)
_de.Value = Me.BaseGet(index)
Return _de
End Get
End Property
' Creates an empty collection.
Public Sub New()
End Sub
' Adds an entry to the collection.
Public Sub Add(key As [String], value As [Object])
Me.BaseAdd(key, value)
End Sub
' Gets a value indicating whether the collection contains keys that are not a null reference.
Public ReadOnly Property HasKeys() As [Boolean]
Get
Return Me.BaseHasKeys()
End Get
End Property
End Class
Public Class SamplesNameObjectCollectionBase
Public Shared Sub Main()
' Creates an empty MyCollection instance.
Dim myCol As New MyCollection()
Console.WriteLine("Initial state of the collection (Count = {0}):", myCol.Count)
PrintKeysAndValues(myCol)
Console.WriteLine("HasKeys? {0}", myCol.HasKeys)
Console.WriteLine()
' Adds an item to the collection.
myCol.Add("blue", "sky")
Console.WriteLine("Initial state of the collection (Count = {0}):", myCol.Count)
PrintKeysAndValues(myCol)
Console.WriteLine("HasKeys? {0}", myCol.HasKeys)
End Sub
Public Shared Sub PrintKeysAndValues(myCol As MyCollection)
Dim i As Integer
For i = 0 To myCol.Count - 1
Console.WriteLine("[{0}] : {1}, {2}", i, myCol(i).Key, myCol(i).Value)
Next i
End Sub
End Class开发者ID:VB.NET开发者，项目名称:System.Collections.Specialized，代码行数:65，代码来源:NameObjectCollectionBase.BaseHasKeys
输出：
Initial state of the collection (Count = 0): HasKeys? False Initial state of the collection (Count = 1): [0] : blue, sky HasKeys? True