Treeview To Display Dates Then Details

May 17, 2008 05:04am pdt

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05.09.2008 at 05:55AM PDT, ID: 23389086

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7.8

Treeview To Display Dates Then Details

Zone: Microsoft Visual Basic.Net

I am brand new to the treeview object but I will have to have it in this particular project.

I have a table that has 2 columns
display_date
display_message

I need the treeview to build a node for each distinct "display_date" and format "MM/DD/YYYY" ....under the "display_date" the child nodes would be "display_message" data that is associated to each date.

I hope this is as simple as it sounds..

Thanks in advance.

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Question Stats

Zone: Programming

Question Asked By: H-SC

Solution Provided By: emoreau

Participating Experts: 2

Solution Grade: A

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05.09.2008 at 06:20AM PDT, ID: 21532455

Rank: Genius

TheLearnedOne:

ASP.NET or WinForms?

05.09.2008 at 06:21AM PDT, ID: 21532467

H-SC:

WinForms....sorry

05.09.2008 at 06:32AM PDT, ID: 21532553

Rank: Genius

TheLearnedOne:

Is this hierarchical data, or just a simple list? Is a TreeView the appropriate control in this case? Would a ListView work also?

05.09.2008 at 06:36AM PDT, ID: 21532597

Rank: Sage

emoreau:

have a look at http://www.emoreau.com/Entries/Articles/2006/04/The-Treeview-control.aspx

05.09.2008 at 06:37AM PDT, ID: 21532605

H-SC:

This would be hierarchical
Example ....

- Dates
- 05/09/2008
- Hello This is a test
- This is a Test2
- 05/10/2008
- Still Testing
- Test3
+ 05/11/2008

05.09.2008 at 06:38AM PDT, ID: 21532621

H-SC:

emoreau,

I tried this but I think that it is using two tables... I am new to the treview thing.

05.09.2008 at 06:44AM PDT, ID: 21532681

Rank: Sage

emoreau:

you can do it with a single table.

replace daProducts with "select distinct display_date from YourTable"
while the second dataadapter will be a "select * from YourVerySameTable"

05.09.2008 at 07:04AM PDT, ID: 21532898

H-SC:

emoreau,

I keep getting an error of "Parent columns and child columns don't have type-matching columns." on the following ...

Dim relPC As DataRelation = ds.Relations.Add("relProductsCategories", _
ds.Tables("message").Columns("display_date"), _
ds.Tables("message").Columns("display_message"))

05.09.2008 at 07:08AM PDT, ID: 21532944

Rank: Sage

emoreau:

the relation has to be the field that links both table together. In your case it should be:

Dim relPC As DataRelation = ds.Relations.Add("relProductsCategories", _
ds.Tables("message").Columns("display_date"), _
ds.Tables("message").Columns("display_date"))

05.09.2008 at 07:12AM PDT, ID: 21532996

H-SC:

I tried and it gives me an error of
"parentkey and childkey are identical"

05.09.2008 at 07:23AM PDT, ID: 21533108

Rank: Sage

emoreau:

wait, you are referencing twice the same datatable (ds.Tables("message"))

can you show more of your code (creation of dataadapter, filling the dataset, creating the relation, ...)

05.09.2008 at 07:31AM PDT, ID: 21533183

H-SC:

here is what I have so far -----

Dim cn As New SqlClient.SqlConnection _
("Server=My_Server;Database=My_DataBase;Trusted_Connection=yes")

Dim daProducts As New SqlClient.SqlDataAdapter("SELECT distinct display_date from message", cn)
Dim daCategories As New SqlClient.SqlDataAdapter("SELECT display_message from message", cn)

Dim ds As New DataSet
daProducts.Fill(ds, "message")
daCategories.Fill(ds, "message")

Dim relPC As DataRelation = ds.Relations.Add("relProductsCategories", _
ds.Tables("message").Columns("display_date"), _
ds.Tables("message").Columns("display_date"))
With TreeView1

.BeginUpdate()

.Nodes.Clear()

For Each drCat As DataRow In ds.Tables("Categories").Rows

Dim nodParent As TreeNode
nodParent = TreeView1.Nodes.Add(drCat.Item("CategoryName").ToString)

For Each drProduct As DataRow In drCat.GetChildRows(relPC)

Dim nodChild As TreeNode
nodChild = nodParent.Nodes.Add(drProduct.Item("ProductName").ToString)
If nodChild.Text.ToUpper.IndexOf("Y") >= 0 Then
nodChild.BackColor = Color.Gray
End If
Next drProduct
Next drCat

.ExpandAll()

.EndUpdate()

.Nodes(0).EnsureVisible()
End With

05.09.2008 at 07:40AM PDT, ID: 21533288

Rank: Sage

emoreau:

You need to change all table names and fields names!

change your code for:

Dim cn As New SqlClient.SqlConnection _
("Server=My_Server;Database=My_DataBase;Trusted_Connection=yes")

Dim daProducts As New SqlClient.SqlDataAdapter("SELECT distinct display_date from message", cn)
Dim daCategories As New SqlClient.SqlDataAdapter("SELECT display_date , display_message from message", cn)

Dim ds As New DataSet
daProducts.Fill(ds, "dates")
daCategories.Fill(ds, "message")

Dim relPC As DataRelation = ds.Relations.Add("relProductsCategories", _
ds.Tables("dates").Columns("display_date"), _
ds.Tables("message").Columns("display_date"))
With TreeView1

.BeginUpdate()

.Nodes.Clear()

For Each drCat As DataRow In ds.Tables("dates").Rows

Dim nodParent As TreeNode
nodParent = TreeView1.Nodes.Add(drCat.Item("display_date").ToString)

For Each drProduct As DataRow In drCat.GetChildRows(relPC)

Dim nodChild As TreeNode
nodChild = nodParent.Nodes.Add(drProduct.Item("display_message").ToString)
Next drProduct
Next drCat

.ExpandAll()

.EndUpdate()

.Nodes(0).EnsureVisible()
End With

Accepted Solution

05.09.2008 at 07:48AM PDT, ID: 21533393

H-SC:

emoreau,

ok I see where I went wrong... It is all starting to make perfect sense. I now think that I am getting the idea of the treeview object..

This is working perfect!
thanks emoreau!

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