Winforms TableLayoutPanel adding rows programmatically

Question

I ve been fighting with this for a while  and have found that a number of other people struggle with the TableLayoutPanel   net 2 0 Winforms  as well   Problem  I am attempting to take a  blank  tablelayoutpanel  which has 10 columns defined  then at runtime programmatically add rows of controls  i e  one control per cell    One might have thought that it should be as simple as   myTableLayoutPanel Controls Add myControl  0    Column Index     0    Row index        But that  for me  doesn t add the rows  So maybe adding in a row style  myTableLayoutPanel RowStyles Clear    myTableLayoutPanel RowStyles Add new RowStyle SizeType Absolute  30F      But that doesn t work either  I ve dug around and found out that the myTableLayoutPanel RowCount usage changes from design time to run time  hence doing myTableLayoutPanel RowCount    doesn t actually add another row  not even before after adding a RowStyle entry for it   Another related issue I am encountering is that the controls will be added to the display  but they all simply get rendered at point 0 0 of the TableLayoutPanel  additionally they are not even constrained to be within the Cell bounds that they are supposed to be displayed within  i e  with Dock   DockStyle Fill they still appear way too large small    Does someone have a working example of adding rows  amp  controls at runtime

User · Answer

It s a weird design  but the TableLayoutPanel RowCount property doesn t reflect the count of the RowStyles collection  and similarly for the ColumnCount property and the ColumnStyles collection   What I ve found I needed in my code was to manually update RowCount ColumnCount after making changes to RowStyles ColumnStyles   Here s an example of code I ve used            lt summary gt          Add a new row to our grid           lt  summary gt          The row should autosize to match whatever is placed within           lt returns gt Index of new row  lt  returns gt      public int AddAutoSizeRow                 Panel RowStyles Add new RowStyle SizeType AutoSize            Panel RowCount   Panel RowStyles Count          mCurrentRow   Panel RowCount - 1          return mCurrentRow          Other thoughts   I ve never used DockStyle Fill to make a control fill a cell in the Grid  I ve done this by setting the Anchors property of the control  If you re adding a lot of controls  make sure you call SuspendLayout and ResumeLayout around the process  else things will run slow as the entire form is relaid after each control is added

User · Answer

Here s my code for adding a new row to a two-column TableLayoutColumn   private void AddRow Control label  Control value        int rowIndex   AddTableRow        detailTable Controls Add label  LabelColumnIndex  rowIndex       if  value    null                detailTable Controls Add value  ValueColumnIndex  rowIndex            private int AddTableRow         int index   detailTable RowCount        RowStyle style   new RowStyle SizeType AutoSize       detailTable RowStyles Add style       return index      The label control goes in the left column and the value control goes in the right column   The controls are generally of type Label and have their AutoSize property set to true   I don t think it matters too much  but for reference  here is the designer code that sets up detailTable   this detailTable ColumnCount   2  this detailTable ColumnStyles Add new System Windows Forms ColumnStyle     this detailTable ColumnStyles Add new System Windows Forms ColumnStyle     this detailTable Dock   System Windows Forms DockStyle Fill  this detailTable Location   new System Drawing Point 0  0   this detailTable Name    detailTable   this detailTable RowCount   1  this detailTable RowStyles Add new System Windows Forms RowStyle     this detailTable Size   new System Drawing Size 266  436   this detailTable TabIndex   0    This all works just fine   You should be aware that there appear to be some problems with disposing controls from a TableLayoutPanel dynamically using the Controls property  at least in some versions of the framework    If you need to remove controls  I suggest disposing the entire TableLayoutPanel and creating a new one

User · Answer

This works perfectly for adding rows and controls in a TableLayoutPanel   Define a blank Tablelayoutpanel with 3 columns in the design page      Dim TableLayoutPanel3 As New TableLayoutPanel        TableLayoutPanel3 Name    TableLayoutPanel3       TableLayoutPanel3 Location   New System Drawing Point 32  287       TableLayoutPanel3 AutoSize   True      TableLayoutPanel3 Size   New System Drawing Size 620  20       TableLayoutPanel3 ColumnCount   3      TableLayoutPanel3 CellBorderStyle   TableLayoutPanelCellBorderStyle Single      TableLayoutPanel3 BackColor   System Drawing Color Transparent      TableLayoutPanel3 ColumnStyles Add New ColumnStyle SizeType Percent  26 34146         TableLayoutPanel3 ColumnStyles Add New ColumnStyle SizeType Percent  73 65854         TableLayoutPanel3 ColumnStyles Add New ColumnStyle SizeType Absolute  85 0         Controls Add TableLayoutPanel3    Create a button btnAddRow to add rows on each click       Private Sub btnAddRow Click sender As System Object  e As System EventArgs  Handles btnAddRow Click            TableLayoutPanel3 GrowStyle   TableLayoutPanelGrowStyle AddRows            TableLayoutPanel3 RowStyles Add New RowStyle SizeType Absolute  20              TableLayoutPanel3 SuspendLayout              TableLayoutPanel3 RowCount    1            Dim tb1 As New TextBox              Dim tb2 As New TextBox              Dim tb3 As New TextBox              TableLayoutPanel3 Controls Add tb1   0  TableLayoutPanel3 RowCount - 1             TableLayoutPanel3 Controls Add tb2  1  TableLayoutPanel3 RowCount - 1             TableLayoutPanel3 Controls Add tb3  2  TableLayoutPanel3 RowCount - 1             TableLayoutPanel3 ResumeLayout              tb1 Focus     End Sub

User · Answer

I just looked into my code  In one application  I just add the controls  but without specifying the index  and when done  I just loop through the row styles and set the size type to AutoSize  So just adding them without specifying the indices seems to add the rows as intended  provided the GrowStyle is set to AddRows    In another application  I clear the controls and set the RowCount property to the needed value  This does not add the RowStyles  Then I add my controls  this time specifying the indices  and add a new RowStyle  RowStyles Add new RowStyle       and this also works   So  pick one of these methods  they both work  I remember the headaches the table layout panel caused me

User · Answer

Private Sub Form1 Load ByVal sender As System Object  ByVal e As System EventArgs  Handles MyBase Load         Dim dt As New DataTable         Dim dc As DataColumn         dc   New DataColumn  Question   System Type GetType  System String            dt Columns Add dc           dc   New DataColumn  Ans1   System Type GetType  System String            dt Columns Add dc          dc   New DataColumn  Ans2   System Type GetType  System String            dt Columns Add dc          dc   New DataColumn  Ans3   System Type GetType  System String            dt Columns Add dc          dc   New DataColumn  Ans4   System Type GetType  System String            dt Columns Add dc          dc   New DataColumn  AnsType   System Type GetType  System String            dt Columns Add dc            Dim Dr As DataRow         Dr   dt NewRow         Dr  Question      What is Your Name          Dr  Ans1      Ravi          Dr  Ans2      Mohan          Dr  Ans3      Sohan          Dr  Ans4      Gopal          Dr  AnsType      Multi          dt Rows Add Dr           Dr   dt NewRow         Dr  Question      What is your father Name          Dr  Ans1      Ravi22          Dr  Ans2      Mohan2          Dr  Ans3      Sohan2          Dr  Ans4      Gopal2          Dr  AnsType      Multi          dt Rows Add Dr          Panel1 GrowStyle   TableLayoutPanelGrowStyle AddRows         Panel1 CellBorderStyle   TableLayoutPanelCellBorderStyle Single         Panel1 BackColor   Color Azure         Panel1 RowStyles Insert 0  New RowStyle SizeType Absolute  50           Dim i As Integer   0          For Each dri As DataRow In dt Rows                Dim lab As New Label               lab Text   dri  Question               lab AutoSize   True              Panel1 Controls Add lab  0  i                Dim Ans1 As CheckBox             Ans1   New CheckBox               Ans1 Text   dri  Ans1               Panel1 Controls Add Ans1  1  i               Dim Ans2 As RadioButton             Ans2   New RadioButton               Ans2 Text   dri  Ans2               Panel1 Controls Add Ans2  2  i              i   i   1               Panel1 Controls Add Pan          Next

User · Answer

I just had a related problem  which is how I found this thread   where my dynamically added row and column styles were not taking effect  I usually consider SuspendLayout   ResumeLayout   as optimizations  but in this case  wrapping my code in them made the rows and columns behave correctly

User · Answer

I just did this last week  Set the GrowStyle on the TableLayoutPanel to AddRows or AddColumns  then your code should work      Adds  myControl  to the first column of each row myTableLayoutPanel Controls Add myControl1  0    Column Index     0    Row index      myTableLayoutPanel Controls Add myControl2  0    Column Index     1    Row index      myTableLayoutPanel Controls Add myControl3  0    Column Index     2    Row index        Here is some working code that seems similar to what you are doing        private Int32 tlpRowCount   0       private void BindAddress                 Addlabel Addresses Street           if   String IsNullOrEmpty Addresses Street2                         Addlabel Addresses Street2                     Addlabel Addresses CityStateZip           if   String IsNullOrEmpty Account Country                         Addlabel Address Country                     Addlabel String Empty      Notice the empty label               private void Addlabel String text                            label   new Label            label Dock   DockStyle Fill          label Text   text          label TextAlign   System Drawing ContentAlignment MiddleLeft          tlpAddress Controls Add label  1  tlpRowCount           tlpRowCount            The TableLayoutPanel always gives me fits with size  In my example above  I m filing an address card that might grow or shrink depending on the account having an address line two  or a country  Because the last row  or column  of the table layout panel will stretch  I throw the empty label in there to force a new empty row  then everything lines up nicely   Here is the designer code so you can see the table I start with                         tlpAddress                     this tlpAddress AutoSize   true          this tlpAddress BackColor   System Drawing Color Transparent          this tlpAddress ColumnCount   2          this tlpAddress ColumnStyles Add new System Windows Forms ColumnStyle System Windows Forms SizeType Absolute  25F            this tlpAddress ColumnStyles Add new System Windows Forms ColumnStyle System Windows Forms SizeType Percent  100F            this tlpAddress Controls Add this pictureBox1  0  0           this tlpAddress Dock   System Windows Forms DockStyle Fill          this tlpAddress Location   new System Drawing Point 0  0           this tlpAddress Name    tlpAddress           this tlpAddress Padding   new System Windows Forms Padding 3           this tlpAddress RowCount   2          this tlpAddress RowStyles Add new System Windows Forms RowStyle             this tlpAddress RowStyles Add new System Windows Forms RowStyle             this tlpAddress Size   new System Drawing Size 220  95           this tlpAddress TabIndex   0

User · Answer

Create a table layout panel with two columns in your form and name it tlpFields   Then  simply add new control to table layout panel  in this case I added 5 labels in column-1 and 5 textboxes in column-2    tlpFields RowStyles Clear       first you must clear rowStyles  for  int ii   0  ii  lt  5  ii          Label l1  new Label        TextBox t1   new TextBox         l1 Text    field           tlpFields Controls Add l1  0  ii       add label in column0     tlpFields Controls Add t1  1  ii       add textbox in column1      tlpFields RowStyles Add new RowStyle SizeType Absolute 30       30 is the rows space     Finally  run the code

[c#] Winforms TableLayoutPanel adding rows programmatically

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