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Using a generic.dictionary as the source for a datagridview

Posted on 2007-03-29
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Last Modified: 2011-10-03
vs2005 vb.net
Public Class test

Private displayValue As String
Private dbType As Integer
Property Display() As String
      Get
            Return displayValue
      End Get
      Set(ByVal value As String)
            displayValue = value
      End Set
End Property

Property DataType() As Integer
      Get
            Return dbType
      End Get
      Set(ByVal value As Integer)
            dbType = value
      End Set
End Property

Public Sub New(ByVal dspl As String, ByVal dt As Integer)
      Display = dspl
      DataType = dt
End Sub
End Class
I have a generic.dictionary [Dim tests As New Generic.Dictionary(Of String, test)] which i would like to bind to a datagridview

if it were a collection (which contained a series of class 'test'), I would :
      datagridview1.datasource = collName
      datagridview1.columns(0).datapropertyName = "Display"
      datagridview1.columns(1).datapropertyName = "DataType"

However I don't appear to be able to do the same thing with a dictionary. So far I found that you need to do:
      datagridview1.datasource = tests.values

But I do not know how to bind the specific value of the class for the dictionary.

Thank you
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Question by:syscomdev
2 Comments
 
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Accepted Solution

by:
graye earned 500 total points
ID: 18827564
You are correct... the Generic.Dictionary class does not support the IList (or any of the other supported interfaces) that would qualify it for being a DataSource.

I'd recommend you use a BindingList instead of a Dictionary.   There is a pretty good example that is almost an exact match to your example at the MSDN web site at:

http://msdn2.microsoft.com/en-us/library/ms132679.aspx
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Author Comment

by:syscomdev
ID: 18832699
The one thing that I would lose would be the ability to find a value by a key, i.e.
tests("example1").datatype = 5.

The item method in the BindingList is only by numeric.
So is my basic choice which is more important? To be able to gather the data by key or to have it displayed?

I know I could have a simple data construct for the pairing, but was hoping to get around it.

Thank you for the example and any other assistance.
0

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