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Binding the ASP.NET TreeView to a DataSet or an ObjectDataSource

, 1 May 2008 CPOL 96.1K 3.3K 32
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The TreeView can not bind to a DataSet or to an ObjectDataSource. With one line of code, you can do that now.

Introduction

The TreeView in ASP.NET is a powerful control that helps display hierarchical data. However, unlike other controls, it does not support binding to a DataSet or an ObjectDataSource. I have seen a lot of developers do this the old fashioned way, filling the tree programmatically, which is a waste of time and energy.

The solution

The key to this solution is that the TreeView can bind to any object implementing the interface IHierarchicalDataSource. So, this article presents to you a small class that will take a DataSet as an input and return an object that implements IHierarchicalDataSource so that the TreeView can easily bind with your DataSets.

Under the hood

The class HierarchicalDataSet presents data in a hierarchy, which means supports Parent-Child relationships, just like the nature of a TreeView control. You have nodes, and under some nodes, you have children. Creating this structure in a database involves having a table reference itself to implement the parent-child relationship. Here is how such a table would look like:

Table

Here is a quick example for some records to see how they will present the child parent relationship:

DataRow row = dataSet.Tables[0].NewRow();
row["ID"] = 1;
row["Text"] = "Parent 1";
dataSet.Tables[0].Rows.Add(row);

row = dataSet.Tables[0].NewRow();
row["ID"] = 2;
row["Text"] = "Parent 2";
dataSet.Tables[0].Rows.Add(row);

row = dataSet.Tables[0].NewRow();
row["ID"] = 3;
row["ParentID"] = 1;
row["Text"] = "Child 1";
dataSet.Tables[0].Rows.Add(row);

row = dataSet.Tables[0].NewRow();
row["ID"] = 4;
row["ParentID"] = 1;
row["Text"] = "Child 2";
dataSet.Tables[0].Rows.Add(row);

row = dataSet.Tables[0].NewRow();
row["ID"] = 5;
row["ParentID"] = 2;
row["Text"] = "Child 3";
dataSet.Tables[0].Rows.Add(row);

row = dataSet.Tables[0].NewRow();
row["ID"] = 6;
row["ParentID"] = 2;
row["Text"] = "Child 4";
dataSet.Tables[0].Rows.Add(row);

Using the code

Using the code is very simple. You need to call the constructor of the class that takes the DataSet and the two column names needed. The primary key and the foreign key reference the same table.

TreeView1.DataSource = new HierarchicalDataSet(dataSet, "ID", "ParentID");

The original blog of this article can be found here.

Hope this helps.

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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About the Author

Ralph Varjabedian
Technical Lead
Lebanon Lebanon
No Biography provided

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Comments and Discussions

 
Questiontam Pin
hienhoa4-Aug-13 17:41
memberhienhoa4-Aug-13 17:41 
GeneralMy vote of 5 Pin
D-Kishore4-Sep-12 18:44
memberD-Kishore4-Sep-12 18:44 
GeneralMy vote of 5 Pin
shrikant.sherekar3-May-12 22:07
membershrikant.sherekar3-May-12 22:07 
GeneralMy vote of 5 Pin
manoj kumar choubey16-Feb-12 0:40
membermanoj kumar choubey16-Feb-12 0:40 
GeneralGreat Article, but what if I have checkboxes in my tree view by having this ShowCheckBoxes="All" Pin
rperetz12-Feb-10 9:19
memberrperetz12-Feb-10 9:19 
GeneralHi Ralph Varjabedian Pin
Magesh Murugesan10-Jan-10 23:35
memberMagesh Murugesan10-Jan-10 23:35 
GeneralRe: Hi Ralph Varjabedian Pin
Ralph Varjabedian11-Oct-13 6:44
memberRalph Varjabedian11-Oct-13 6:44 
GeneralUtterly awesome! Pin
dropit2-Oct-08 3:22
memberdropit2-Oct-08 3:22 
GeneralRe: Utterly awesome! Pin
Ralph Varjabedian2-Oct-08 22:35
memberRalph Varjabedian2-Oct-08 22:35 
GeneralSlight bug in this Pin
DMardell2-Sep-08 2:35
memberDMardell2-Sep-08 2:35 
GeneralRe: Slight bug in this Pin
Ralph Varjabedian2-Sep-08 3:26
memberRalph Varjabedian2-Sep-08 3:26 
GeneralRe: Slight bug in this Pin
DMardell2-Sep-08 8:23
memberDMardell2-Sep-08 8:23 
GeneralRe: Slight bug in this Pin
Ralph Varjabedian2-Sep-08 22:37
memberRalph Varjabedian2-Sep-08 22:37 
GeneralRe: Slight bug in this Pin
DMardell5-Sep-08 10:36
memberDMardell5-Sep-08 10:36 
GeneralVery nice Pin
MR_SAM_PIPER7-May-08 14:14
memberMR_SAM_PIPER7-May-08 14:14 
GeneralRe: Very nice Pin
Ralph Varjabedian7-May-08 21:19
memberRalph Varjabedian7-May-08 21:19 
GeneralNot so nice though! Pin
Balamurali Balaji2-May-08 22:51
memberBalamurali Balaji2-May-08 22:51 
GeneralRe: Not so nice though! Pin
Ralph Varjabedian3-May-08 2:33
memberRalph Varjabedian3-May-08 2:33 
GeneralRe: Not so nice though! Pin
Balamurali Balaji3-May-08 4:24
memberBalamurali Balaji3-May-08 4:24 
GeneralRe: Not so nice though! Pin
Ralph Varjabedian3-May-08 6:59
memberRalph Varjabedian3-May-08 6:59 
GeneralRe: Not so nice though! Pin
Balamurali Balaji3-May-08 8:11
memberBalamurali Balaji3-May-08 8:11 
GeneralRe: Not so nice though! Pin
Ralph Varjabedian3-May-08 11:12
memberRalph Varjabedian3-May-08 11:12 
GeneralRe: Not so nice though! Pin
Balamurali Balaji3-May-08 18:00
memberBalamurali Balaji3-May-08 18:00 
GeneralRe: Not so nice though! Pin
Ralph Varjabedian4-May-08 1:03
memberRalph Varjabedian4-May-08 1:03 
GeneralRe: Not so nice though! Pin
Balamurali Balaji4-May-08 3:41
memberBalamurali Balaji4-May-08 3:41 

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