Setting images in DataListView (Part of ObjectListView)

Question

I've just started using the DataListView (Part of ObjectListView package). I'm binding a datatable to the DataListView but now I want to add images to the data based on certain criteria. I've spent hours reading the help files (http://objectlistview.sourceforge.net/cs/recipes.html#how-do-i-bind-a-dataset-to-an-objectlistview) but they all seem to reference 'ObjectListView' instead of 'DataListView'.

I've read a lot about the imagegetter but I don't think that applies when you're binding to a datatable (if so, how?).

Should I loop through each line and manually add the image based on the criteria? If so, could you help me get this started?

Here is an example from their webpage. See how they have the image in the first column (and other) based on the data? I'd like to do that with the DataListView.

1

I'm using VB.net

Now I have this:

Dim myImages = New ImageList
myImages.Images.Add(My.Resources.important_High_icon)
myImages.Images.Add(My.Resources.important_Med_icon)
myImages.Images.Add(My.Resources.important_Low_icon)
myDataListView.SmallImageList = myImages

myDataListView.OwnerDraw = True
Image_Column.ImageGetter = Function(x As Object) As Integer
   Select Case (Important_Column.value)
     Case "High"
       Return 0
     Case "Medium"
       Return 1
     Case "Low"
       Return 2
   End Select
   End Function

How do I reference another column in that row to base the logic off of? In the example above, I'm trying to reference the value in the 'Important_Column'

Answer 1

First, set your list's OwnerDraw property to true:

yourList.OwnerDraw = True 

Then link your list to an ImageList:

   myImages = New ImageList
   myImages.Images.Add(My.Resources.image_1)
   myImages.Images.Add(My.Resources.image_2)
   yourList.SmallImageList = yourImageList

Then you should set an image getter delegate on your ObjectListView column, for example:

myOlvColumn.ImageGetter = 
    Function(x As Object) As Integer
        Dim casted As yourColumnRealType = DirectCast(x, yourColumnRealType)
        Return If(yourCondition, 0, 1)
    End Function

The delegate function returns an index into the image list, or, since the ObjectListView is owner-drawn, the delegate can return an Image.