包含带外卡的组合框功能 [英] Contains function of combo box with wild cards

问题描述

我需要检查我的组合框是否包含部分值。

例如，它包含ABC测试



当用户键入ABC时，它应该显示文本已经存在的消息



我可以使用像
这样的通配符

Hi,
I need to check if my combo box contains a part of value or not.
For example, it contains ABC Test

When user types ABC, it should give a message the text is already there

Can I use wildcards like

If ComboBox1.Items.Contains("*" & "ABC" & "*") Then

谢谢



我有什么试过：



用Google搜索并做了很多实验

Thanks

What I have tried:

Googled and have done lots of experiments

推荐答案

没有内置功能，所以你必须自己做。



这应该工作（这是一种扩展方法）：

There is no inbuilt functionality for this so you have to make your own.

This should work (it's an extension method):

Module ComboBoxExt
    <Runtime.CompilerServices.Extension>
    Public Function ContainsItemWithSubstring(cb As ComboBox, substring As String) As Boolean

        If cb.Items.Count = 0 Then
            Return False
        End If

        If TypeOf cb.Items(0) Is DataRowView Then
            If cb.DisplayMember IsNot Nothing AndAlso TypeOf DirectCast(cb.Items(0), DataRowView)(cb.DisplayMember) Is [String] Then
                For Each item As Object In cb.Items
                    If DirectCast(DirectCast(item, DataRowView)(cb.DisplayMember), [String]).Contains(substring) Then
                        Return True
                    End If
                Next
            End If
        Else
            For Each item As Object In cb.Items
                If TypeOf item Is [String] AndAlso DirectCast(item, [String]).Contains(substring) Then
                    Return True
                End If
            Next
        End If

        Return False

    End Function
End Module

它适用于任何对象的正常Items集合（显然只对字符串有意义）和一个绑定到DataTable的ComboBox或DataView提供了.DisplayMember属性设置。



您可以这样使用它：

It works with a normal Items-collection of whatever-objects (obviously only makes sense with strings) and with a ComboBox that's bound to a DataTable or DataView provided that the .DisplayMember-property has been set.

You can then use it like this:

If MyComboBox.ContainsItemWithSubstring("ABC") Then

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