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.NET Forum / ASP.NET / General / October 2007GridView - no columns
I have a GridView that successfully populates, however when I interrogate its Columns collection in code it has 0 entries (there should be in my case 4) I need this to change the visible property of some columns. Guy >I have a GridView that successfully populates, however when I interrogate >its > Columns collection in code it has 0 entries (there should be in my case 4) > I need this to change the visible property of some columns. Are you doing this after the data has been bound?  SignatureMark Rae ASP.NET MVP http://www.markrae.net Hi Guy, You need to add the columns in the Columns Collection of the GridView in order to access them dynamically. Dim col As New BoundField col.DataField = "Col1" col.HeaderText = "header name" Me.GridView1.Columns.Add(col) or through designer using the smart arrow tag on the GridView and then select EditColumns and add the BoundFields in the Selected Columns list. Regards, Manish You can add it through code using > I have a GridView that successfully populates, however when I interrogate its > Columns collection in code it has 0 entries (there should be in my case 4) > I need this to change the visible property of some columns. > > Guy Thanks Manish, I need autogenerated columns as the GridView may be displaying data from different sources and have different column properties at different times e.g column six may be text, and later a checkbox. how can I interrogate the column properties for an autogenerated column? guy > Hi Guy, > [quoted text clipped - 19 lines] > > > > Guy Hi Guy, Then you can try accessing the RowCreated and RowDataBound event of the GridView to access the items in any of the columns like below: Protected Sub GridView1_RowDataBound(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewRowEventArgs) Handles GridView1.RowDataBound If e.Row.RowType = DataControlRowType.DataRow Then Response.Write(e.Row.Cells(1).Text) End If End Sub Regards, Manish > Thanks Manish, > I need autogenerated columns as the GridView may be displaying data from [quoted text clipped - 27 lines] > > > > > > Guy Thanks Manish, I have knocked up class to give more control I know changes that I ned to make but it works:-) cheers Guy ------------------------ Option Strict On Imports Microsoft.VisualBasic Public Class AutoGridColumns Private _fieldCells As New List(Of DataControlFieldCell) Private _view As GridView Public Property FieldCells() As List(Of DataControlFieldCell) Get Return _fieldCells End Get Set(ByVal value As List(Of DataControlFieldCell)) _fieldCells = value End Set End Property Public Sub New(ByVal view As GridView) Refresh(view) End Sub Public Sub Refresh(ByVal view As GridView) _view = view If _view.Rows.Count > 0 Then For Each cell As DataControlFieldCell In _view.Rows(0).Controls FieldCells.Add(cell) Next End If End Sub Public Sub HideColumn(ByVal columnNo As Integer) FieldCells(columnNo).Visible = False For Each r As GridViewRow In _view.Rows r.Controls(columnNo).Visible = FieldCells(columnNo).Visible Next _view.HeaderRow.Controls(columnNo).Visible = FieldCells(columnNo).Visible End Sub Public Sub ShowColumn(ByVal columnNo As Integer) FieldCells(columnNo).Visible = False For Each r As GridViewRow In _view.Rows r.Controls(columnNo).Visible = FieldCells(columnNo).Visible Next _view.HeaderRow.Controls(columnNo).Visible = FieldCells(columnNo).Visible End Sub End Class --------------------------- > Hi Guy, > [quoted text clipped - 42 lines] > > > > > > > > Guy You can access the Columns collection for autogenerated columns only in RowCreated event. SignatureEliyahu Goldin, Software Developer Microsoft MVP [ASP.NET] http://msmvps.com/blogs/egoldin http://usableasp.net > Thanks Manish, > I need autogenerated columns as the GridView may be displaying data from [quoted text clipped - 30 lines] >> > >> > Guy Hi Guy, You also need to make the AutogeneratedColumns property of the GridView to be false to avoid repitition of the data. Regards, Manish > I have a GridView that successfully populates, however when I interrogate its > Columns collection in code it has 0 entries (there should be in my case 4) > I need this to change the visible property of some columns. > > Guy Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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