Visual Basic

Binding datagrid to collection class

19-Feb-07 2:43

Since you are changing the topic you should start your own thread.

BUT, you just need to set a function name to be called in the OnClick event of the template column's checkbox. That function should be Protected instead of Private.

Cleako

jazzyjboombox14-Feb-07 17:51

14-Feb-07 17:51

Can anyone help?

I have a collection class called Customers that allows users to add Customer objects etc. The customer objects are held in a collection. The Customers class implements IEnumerable to enable users to enumerate through the collection via for each and has a public property called Datasource so a user can bind this collection to a datagrid for example. However, after binding the datasource I cannot hide the relevant columns that represent public properties of the class Customer which I assume is because the Collection Class does not implement IList. Apart from making these properties in Customer private or implementing IList, is there any other way I can hide these columns but still bind the datagrid to the collection?

Cheers JazzyJ Smile | :)

Johan Hakkesteegt14-Feb-07 19:50

Johan Hakkesteegt

14-Feb-07 19:50

Hi,

Use TableStyles and GridColumnStyles from the DataGrid properties. They work like a mask, you map the TableStyle to the entire collection and each GridColumnStyle to a column in your collection. Then you have two ways to hide the columns from a user: 1. Just don't create a GridColumnStyle for the columns you want to hide. or 2. Create GridColumnStyles for all you columns, and set the width of the columns you want to hide to 0 or 1 or something.

Good luck,

Johan

My advice is free, and you may get what you paid for.

jazzyjboombox15-Feb-07 9:44

15-Feb-07 9:44

Hi Johan,

Thanks for your reply. I'm pretty new to VB.net so I apologise if I'm slow to catch on.

I am currently using the DataGridTableStyle and DataGridTextBoxColumm classes to modify the appearance of the datagrid but this doesn't seem to work. Is this the same as mapping to the TableStyle and GridStyleColumm classes you refer to?

My code is as follows:

Dim ts As DataGridTableStyle = New DataGridTableStyle
ts.MappingName = Clients.ActiveRecord.Branchs.MappingName
ts.AlternatingBackColor = System.Drawing.Color.LightBlue

Dim BranchIDColumn As New DataGridTextBoxColumn
BranchIDColumn.MappingName = "BranchID"
BranchIDColumn.HeaderText = "Branch ID"
BranchIDColumn.Width = 0

Dim BranchNameColumn As New DataGridTextBoxColumn
BranchNameColumn.MappingName = "Name"
BranchNameColumn.HeaderText = "Name"
BranchNameColumn.Width = 1000

Dim ClientIDColumn As New DataGridTextBoxColumn
ClientIDColumn.MappingName = "ClientID"
ClientIDColumn.HeaderText = "Client ID"
ClientIDColumn.Width = 0

Dim BranchDateColumn As New DataGridTextBoxColumn
BranchDateColumn.MappingName = "ModifiedDate"
BranchDateColumn.HeaderText = "Modified Date"
BranchDateColumn.Width = 0

' Adds the column styles to the grid table style.
ts.GridColumnStyles.Add(BranchIDColumn)
ts.GridColumnStyles.Add(BranchNameColumn)
ts.GridColumnStyles.Add(ClientIDColumn)
ts.GridColumnStyles.Add(BranchDateColumn)

' Add the table style to the collection, but clear the
' collection first.
Me.datBranchs.TableStyles.Clear()
Me.datBranchs.TableStyles.Add(ts)

' set datasource and hide columns
Me.datBranchs.SetDataBinding(Clients.ActiveRecord.Branchs.DataSource, "")

I have moved the SetDataBinding method to before I create the DataGridTableStyle and to the end where it currently is to see if that is the problem but all columns are visible even though I have set some to 0.

The mapping name is a string that is the class name of the objects stored in the collection ie. "clsBranch[]"

Thanks for any help you can provide.

David Smile | :)

Binding datagrid to collection class

Johan Hakkesteegt19-Feb-07 20:13

Johan Hakkesteegt

19-Feb-07 20:13

Hi David,

As far as I can tell, you have build the TableStyle and everything correctly. However, because you create the TableStyle at runtime, you also need to link the TableStyle to the datagrid. By the look of things, that's all that is missing from your code.

Good luck,

Johan

My advice is free, and you may get what you paid for.

jazzyjboombox22-Feb-07 9:50

Binding datagrid to collection class

22-Feb-07 9:50

Thanks Johan. I will give that a go.

Kind regards

David

jazzyjboombox3-Mar-07 22:28

3-Mar-07 22:28

Hi Johan,

At the bottom of the code I add the table style to the tablestyles collection of the datagrid.

Me.datBranchs.TableStyles.Add(ts)

Is that what you mean by linking the tablestyle to the datagrid because it still doesn't work??? Maybe I should find another job!

Kind regards

David;)

Johan Hakkesteegt4-Mar-07 21:12

Johan Hakkesteegt

4-Mar-07 21:12

Hi David,

No need to get another job, just do like me: lure a poor coder from India, Pakistan or Sri Lanka to where you live, with the empty promise of a greencard, have him do all the work, and claim it as your own.

But seriously...

You really did write it by the book, as far as I can tell, so I am not entirely sure why it still doesn't work. The only thing I can think of, for you to try is to use:

<br />
datBranchs.DataSource = WhatWasYourSourceDataSetAgain<br />
datBranchs.DataMember = "WhatTableInYouDataSetWasIt_IDontRemember"<br />

instead of .DataBinding at the end.

Regards,

Johan

My advice is free, and you may get what you paid for.

jazzyjboombox4-Mar-07 22:03

4-Mar-07 22:03

I don't think I would be able to do that here in New Zealand (down by Australia if you don't know where that is) with our pc brigade, I would be hung, strung and quartered. No jokes about sheep please!

I will give that a go, thanks again Johan.

Regards

David

Grid Filtering

rrrriiizz14-Feb-07 17:01

14-Feb-07 17:01

Hai everybody,

Am using Vb.net as my frond end and sql server 2000 as my back end.
in one of my screen am using grid control to view the data's in the tables, my problem is i want to filter the grid data's ie sno wise filter and name wise Filter. How can i do it? is it possible ? Please Give me detail description. Frown | :(

Marcus J. Smith15-Feb-07 2:00

15-Feb-07 2:00

Do you want a filter from user input or filter the data before it gets to the page?

If you are wanting to pre-filter it then I would do that with your stored procedure.

If you are looking to do this based on user input then you can set you dataset/datatable = to a dataview. Then use a Dataview.Filter = "Column = Validated user input" which is similar to SQL but only requires the WHERE (which is what the "=" means) so remember to use ' ' for characters and the exact value for numerics.

Cleako

rrrriiizz16-Feb-07 17:24

16-Feb-07 17:24

Thanks Mr.Cleako

I want to filter the data's by user input in text box and then he press a button. ie am filtering employee database in that database it contains more than 600 records inthat you want to extract particular employee from that database in that case only am in need of grid filter option. in my form i used 5 controls 3 buttons and a textbox and a grid, user given his input in a text box and then press any one button ie filterby empno or filterby ename or by department in that case am using below code for on of my button press but it was not working tell me some suggestion or code

Private Sub btneno_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btneno.Click
con.Open()
str = "select * from empmaster1 where Eno='" & txtsearch.Text & "'"
da = New OdbcDataAdapter(str, con)
da.Fill(Dspay, "empmaster1")
dgv.DataSource = Dspay
con.Close()
End Sub

Grid name is dgv
Dataset name is Dspay
table name is empmaster1
in pageload event am writing code for connection

Please help me.....

Marcus J. Smith18-Feb-07 4:07

18-Feb-07 4:07

rrrriiizz wrote:
Private Sub btneno_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btneno.Click
con.Open()
str = "select * from empmaster1 where Eno='" & txtsearch.Text & "'"
da = New OdbcDataAdapter(str, con)
da.Fill(Dspay, "empmaster1")
dgv.DataSource = Dspay
con.Close()
End Sub

If you are allowing them to type anything in the textbox then you should change your SQL to be "LIKE %'" & txtsearch.Text & "'%" instead. I would also suggest you not directly use the textbox text but set it to a variable and pre-validate what they typed because this can lead to a SQL Injection Attack by them typing in the correct commands.

Cleako

rrrriiizz18-Feb-07 22:39

18-Feb-07 22:39

Mr.clicko

This command also not working Please help me
is my code is right? am n a great trouble with this filtering for past one week....

Marcus J. Smith19-Feb-07 2:44

19-Feb-07 2:44

The "LIKE" does not work either? Have you tried typing something in that you know for sure is present?

Private Sub btneno_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btneno.Click
con.Open()
str = "select * from empmaster1 where Eno='" & txtsearch.Text & "'"
da = New OdbcDataAdapter(str, con)
da.Fill(Dspay, "empmaster1")
dgv.DataSource = Dspay
con.Close()
End Sub

One thing that I would suggest is to convert the Eno column to a varchar if it is currently a numeric column. I do not know if that is your DB setup or not but it's worth a try.

Select * FROM EmpMaster1 WHERE CAST(Eno AS VarChar(30)) LIKE %'" & txtSearch.Text & "'%"

Cleako

rrrriiizz21-Feb-07 21:39

21-Feb-07 21:39

Mr.Cleako,

this is also not working cause am trying to get the values for Particular Employee name also. but it is also not working. thanks for your supports and help for past four days am not able to browse. thats what Late reply. if there is any other Method or technique is there for filtering please tell me and also code or syntax. Please Help.....

Thank You

Marcus J. Smith23-Feb-07 5:04