Saturday, February 26, 2011

VB.NET - ListView Class

This example requires that you have added the code to a Form and call the method created in the example from the constructor or another method on the form. The example also requires that images named MySmallImage1, MySmallImage2, MyLargeImage1, and MyLargeImage2 are located in the root directory of drive C.

for more details : http://msdn.microsoft.com/en-us/library/system.windows.forms.listview.aspx

        Private Sub CreateMyListView()
            ' Create a new ListView control.
            Dim listView1 As New ListView()
            listView1.Bounds = New Rectangle(New Point(10, 10), New Size(300, 200))
            ' Set the view to show details.
            listView1.View = View.Details
            ' Allow the user to edit item text.
            listView1.LabelEdit = True
            ' Allow the user to rearrange columns.
            listView1.AllowColumnReorder = True
            ' Display check boxes.
            listView1.CheckBoxes = True
            ' Select the item and subitems when selection is made.
            listView1.FullRowSelect = True
            ' Display grid lines.
            listView1.GridLines = True
            ' Sort the items in the list in ascending order.
            listView1.Sorting = SortOrder.Ascending
            ' Create three items and three sets of subitems for each item.
            Dim item1 As New ListViewItem("item1", 0)
            ' Place a check mark next to the item.
            item1.Checked = True
            item1.SubItems.Add("1")
            item1.SubItems.Add("2")
            item1.SubItems.Add("3")
            Dim item2 As New ListViewItem("item2", 1)
            item2.SubItems.Add("4")
            item2.SubItems.Add("5")
            item2.SubItems.Add("6")
            Dim item3 As New ListViewItem("item3", 0)
            ' Place a check mark next to the item.
            item3.Checked = True
            item3.SubItems.Add("7")
            item3.SubItems.Add("8")
            item3.SubItems.Add("9")
            ' Create columns for the items and subitems.
            ' Width of -2 indicates auto-size.
            listView1.Columns.Add("Item Column", -2, HorizontalAlignment.Left)
            listView1.Columns.Add("Column 2", -2, HorizontalAlignment.Left)
            listView1.Columns.Add("Column 3", -2, HorizontalAlignment.Left)
            listView1.Columns.Add("Column 4", -2, HorizontalAlignment.Center)
            'Add the items to the ListView.
            listView1.Items.AddRange(New ListViewItem() {item1, item2, item3})
            ' Create two ImageList objects.
            Dim imageListSmall As New ImageList()
            Dim imageListLarge As New ImageList()
            ' Initialize the ImageList objects with bitmaps.
            imageListSmall.Images.Add(Bitmap.FromFile("C:\MySmallImage1.bmp"))
            imageListSmall.Images.Add(Bitmap.FromFile("C:\MySmallImage2.bmp"))
            imageListLarge.Images.Add(Bitmap.FromFile("C:\MyLargeImage1.bmp"))
            imageListLarge.Images.Add(Bitmap.FromFile("C:\MyLargeImage2.bmp"))
            'Assign the ImageList objects to the ListView.
            listView1.LargeImageList = imageListLarge
            listView1.SmallImageList = imageListSmall
            ' Add the ListView to the control collection.
            Me.Controls.Add(listView1)
        End Sub 'CreateMyListView

Friday, February 18, 2011

Like Operator - VB.NET

This example uses the Like operator to compare a string to a pattern. The result is a Boolean value representing whether the string fits the pattern.

Dim myCheck As Boolean
myCheck = "F" Like "F"   ' Does "F" match "F"? Returns True.
myCheck = "F" Like "f"   ' Does "F" match "f"? Returns False.
myCheck = "F" Like "FFF"   ' Does "F" match "FFF"? Returns False.
myCheck = "aBBBa" Like "a*a"   ' Does "aBBBa" have a "a" at the
   ' beginning, an "a" at the end, and any number of characters in
   ' between? Returns True.
myCheck = "F" Like "[A-Z]"   ' Does "F" occur in the set of
   ' characters from A to Z? Returns True.
myCheck = "F" Like "[!A-Z]"     ' Does "F" NOT occur in the set of
   ' characters from A to Z? Returns False.
myCheck = "a2a" Like "a#a"     ' Does "a2a" begin and end with an
   ' "a" and have any single-digit number inbetween? Returns True.
myCheck = "aM5b" Like "a[L-P]#[!c-e]" ' Does "aM5b" fit the following
   ' pattern: Begins with "a", has and character from the set L through
   ' P, followed byb any single-digit number, and finally contains any
   ' character excluded from the character set c through e. Returns True.
myCheck = "BAT123khg" Like "B?T*"  ' Does "BAT123khg" fit the
   ' following pattern: Begins with "B", followed by any single
   ' character, followed by a "T" and finally zero or more characters
   ' of any type. Returns True.
myCheck = "CAT123khg" Like "B?T*"  ' Does "CAT123khg" fit the
   ' following pattern: Begins with "B", followed by any single
   ' character, followed by a "T" and finally zero or more characters
   ' of any type. Returns False.
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from : http://msdn.microsoft.com/en-us/library/swf8kaxw(v=vs.71).aspx