[2005] Show File Properties

[danasegarane]

Dear all,

How to show the File Properties in Property Gird

dana

[RobDog888]

Probably best for reuse, create a class with the properties you are wanting to display in the PG. Then populate from the selected file. Then bind the class to the PG using the .SelectedObject property. Using attribute tags on your props designate how and where they are shown in the grid, if at all desired.

Imports System.ComponentModel
 
Public Class PropertyClass
    Private mprop1 As String = "Text"
    Private mprop2 As Integer = 1
    Private mprop3 As Bitmap
    Private mprop4 As Color = Color.Red
 
    <Category("Category1"), DefaultValue("Text")> _
    Public Property Property1() As String
        Get
            Return mprop1
        End Get
        Set(ByVal Value As String)
            mprop1 = Value
        End Set
    End Property
 
    <Category("Category1"), DefaultValue(1)> _
    Public Property Property2() As Integer
        Get
            Return mprop2
        End Get
        Set(ByVal Value As Integer)
            mprop2 = Value
        End Set
    End Property
 
    <Category("Category2")> _
    Public Property Property3() As Bitmap
        Get
            Return mprop3
        End Get
        Set(ByVal Value As Bitmap)
            mprop3 = Value
        End Set
    End Property
 
    <Category("Category2"), DefaultValue(GetType(Color), "Red")> _
    Public Property Property4() As Color
        Get
            Return mprop4
        End Get
        Set(ByVal Value As Color)
            mprop4 = Value
        End Set
    End Property
End Class

Example Usage:

Private mproperties As New PropertyClass
    Private propGrid As New PropertyGrid
 
    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        propGrid.Location = New Point(10, 10)
        propGrid.Size = New Size(200, 250)
        propGrid.Dock = DockStyle.Fill
        propGrid.CommandsVisibleIfAvailable = True
        propGrid.Text = "My Property Grid"
 
        pnlPropGrid.Controls.Add(propGrid)
 
        propGrid.SelectedObject = mproperties
    End Sub
 
    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        ' Save mproperties content here
    End Sub

[danasegarane]

Dear Robert,
Thanks for your reply.Now I found this code do display the default file properties.

PropertyGrid1.SelectedObject = New FileInfo("c:\test.txt")

And now I can add some properties to this additionally

[RobDog888]

Cool, didnt think about doing it that way but if you want to override some of the default properties then you will need the intermediate class like I posted.

[danasegarane]

Can we able to add some extra property to inaddition to the default showing when this command is executed

PropertyGrid1.SelectedObject = New IO.FileInfo("filename.ext")

[jmcilhinney]

You can only show properties of the object that you've assigned to the SelectedObject property of the grid. If you want to show other properties then you'd have to assign a different type of object that has those properties. You can define your own type that wraps a FileInfo and provides those additional properties if you like.

[danasegarane]

Dear JMC,
Wheather I have to write a new wrapper for all the properties of the Fileinfo.Or just inherit the existing property and add my properties /

[jmcilhinney]

Which do you think would be better and why? Is there any impediment to doing it that way?

[danasegarane]

I think inheriting the existing properties,adding new properties (mine) and showing is will be the best one

[jmcilhinney]

What benefit(s) does that provide? Is there any impediment to doing it that way? Is there any benefit to doing it the other way?

[RobDog888]

I think the question is what are you trying to accomplish? Just showing the default properties, showing and adding new properties, showing and overriding default properties, etc.

[danasegarane]

Yes Robert,You are 200 % Correct