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How to create an "inline" object to contain members for a ComboBox?

开发者 https://www.devze.com 2023-04-10 20:26 出处:网络
I have an enumeration in the form: Public Enum MyCollections As Integer My_Stuff = 0 My_Things = 1 End Enum

I have an enumeration in the form:

Public Enum MyCollections As Integer
    My_Stuff = 0
    My_Things = 1
End Enum

I would like to use these as values in a ComboBox, but I would like to display the strings "My Stuff" and "My Things" respectively.

I'm sure I've seen a method for quickly creating some kind of local object definition where I can assign a string property to be displ开发者_如何学Pythonayed, and a "MyCollections" type property to store the value of the enum element, but I can't for the life of me think of how to explain that to a search engine.

Can anyone interpet my vague memories into some code I can use to set a DataSource for my ComboBox and retrieve the data when a user changes the selection?


I like creating a simple object and filling the ComboBox with a collection of my simple object. Then I set the DisplayMember property of the ComboBox to the name of the property I want displayed from my simple object.

'Something like this
Class SimpleObject
    Property Name As String
End Class

'And then later...
comboBox.DisplayMember = "Name"


I think this is what you want - it enumerates the enumeration, listing the value and the text string of the value (taking out the underscores):

    Dim enumValue As Integer, enumName As String
    For Each enumValue In System.Enum.GetValues(GetType(MyCollections))
        enumName = System.Enum.GetName(GetType(MyCollections), enumValue).Replace("_", " ")
        Debug.WriteLine(enumValue.ToString + ";" + enumName)
    Next

Output:

0;My Stuff
1;My Things

Putting this data into a combobox will require a databind which will probably require a custom class in your case but the code above may get you started.


Right, it looks as though I was thinking of "anonymous types". Here's some code that answer the (vary, very vague) question I as trying to ask:

Private Sub TestCodeForm_Load(sender As System.Object, e As System.EventArgs) Handles MyBase.Load
    Dim addOutcomes As New Collection
    For Each enumIn As MyCollections In [Enum].GetValues(GetType(MyCollections))
        addOutcomes.Add(New With {.Display = [Enum].GetName(GetType(MyCollections), enumIn), .Value = enumIn})
    Next

    Me.ComboBox1.DisplayMember = "Display"
    Me.ComboBox1.ValueMember = "Value"
    Me.ComboBox1.DataSource = addOutcomes
End Sub

Private Sub ComboBox1_SelectedIndexChanged(sender As System.Object, e As System.EventArgs) Handles ComboBox1.SelectedIndexChanged
    MsgBox("Display: " & CType(sender, ComboBox).SelectedItem.Display & vbCrLf &
           "Value: " & CType(sender, ComboBox).SelectedItem.value.GetType.ToString)
End Sub
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