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You may be asking yourself: What's a GridView? I certainly didn't see it in the toolbox. Though it would be nice to have one... This example shows you how I've wrapped a ListView in a UserControl and turned it into a simple grid control. Many times I find myself not wanting to think about items, subitems, listitems, whatever. I just want to put a string in a row and column position, or populate a row, or populate a column. I suspect Microsoft never intended the ListView to be used as a Grid, but so many people were doing it, they enabled the capability for using it as a grid without supplying the methods. The GridView class wraps a bunch of the powerful ListView methods and properties, and gives you an easy means of sticking a string in a row and column position. Below is the code for populating the line you see in Fig 1.01:

Fig 1.01
Public Sub New() ' ' Required for Windows Form Designer support ' InitializeComponent() ' set the column names at the top gridView1.SetColumnNames(New String() {"FirstName", "LastName", "Company", "E-mail"}) gridView1.SetColumnWidth(0, 10) ' sets the width of the column in font units gridView1.SetColumnWidth(1, 10) ' sets the width of the column in font units gridView1.SetColumnWidth(2, 15) ' sets the width of the column in font units gridView1.SetColumnWidth(3, 20) ' sets the width of the column in font units// populate a row of data gridView1.SetFullRow(2, New String() {"John", "Doe", "Microsoft"," joe@aol.com"}) End Sub 'New
You can also use the gridView UserControl1 to set individual cells:
gridView1.SetCell(4, 3, bob@hotmail.com")
The Design of the Control is fairly easy. It just takes advantage of all the features of a ListView and wraps them so the control behaves as a grid. Below is the code for populating a cell in a GridView. Note that it works around the problem of a SubItem starting in column 1 (the second column).
Public Sub SetCell(aRow As Integer, aColumn As Integer, [text] As String) If aRow >= listView1.ListItems.Count Then ' precondition MessageBox.Show("SetCell:Row out of range") Return End If If aColumn >= listView1.Columns.Count Then ' precondition MessageBox.Show("SetCell:Column out of range") Return End If ' populate the cell at the position specified by row and columnif (aColumn == 0) listView1.ListItems(aRow).Text = text Else listView1.ListItems(aRow).SetSubItem(aColumn - 1, text) End If End Sub 'SetCell
Once the UserControl is installed in your project, you can use it from the toolbox and size the grid to what you need. Also the Grid can be constructed with the dimensions of rows and columns you are using:
me.gridView1 = new GridViewSample.GridView (20,4)
It has really become easy to create your own components. This one could be expanded to have editing capability like Excel. Hope you find it useful !
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Mike Gold
Michael Gold is President of Microgold Software Inc., makers of the WithClass UML Tool. His company is a Microsoft VBA Partner and Borland Partner. Mike is a Microsoft MVP and founding member of C# Corner. He has a BSEE and MEng EE from Cornell University and has consulted for Chase Manhattan Bank, JP Morgan, Merrill Lynch, and Charles Schwab. Currently he is a senior developer at Finisar Corp. He has been involved in several .NET book projects, and is currently working on a book for using .NET with embedded systems. He can be reached at mike@c-sharpcorner.com
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