I got a Categorie Table with a column for the Tree View in my Database which I want to display as a Tree View.
My TreeView Column Looks like the following. (I Hope you understand)
0001. 0001.0001. 0001.0002. 0001.0002.0001. 0001.0002.0002. 0001.0003. 0002. ... ... ...
Is this possible to be displayed in a asp:TreeView? Or what other way can I use to display this?
The Database already existed I’m just designing the website & can’t do much in the database.
EDIT:
I tried the first Solutions and now I got this.
Image
But I don’t want to display the number, just the name and the number just as value invisible for me to use when I click on it.
Answers:
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Method 1
Try something like following :
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
namespace WindowsFormsApplication64
{
public partial class Form1 : Form
{
DataTable dt = null;
public Form1()
{
InitializeComponent();
dt = new DataTable();
dt.Columns.Add("Index", typeof(string));
dt.Columns.Add("Value", typeof(string));
dt.Rows.Add(new object[] { "0001.", "aaaa"});
dt.Rows.Add(new object[] { "0001.0001.", "bbbb"});
dt.Rows.Add(new object[] { "0001.0002.", "cccc"});
dt.Rows.Add(new object[] { "0001.0002.0001.", "dddd"});
dt.Rows.Add(new object[] { "0001.0002.0002.", "eeee"});
dt.Rows.Add(new object[] { "0001.0003.", "ffff"});
dt.Rows.Add(new object[] { "0002.", "gggg" });
new Index(dt);
MakeTreeRecursive(0, Index.indexes, null);
treeView1.ExpandAll();
}
public void MakeTreeRecursive(int level, List<Index> rows, TreeNode parent)
{
TreeNode child = null;
var groups = rows
.OrderBy(x => x.paragraphs[level])
.GroupBy(x => x.paragraphs[level]);
foreach (var group in groups)
{
child = new TreeNode(group.Key);
if (parent == null)
{
treeView1.Nodes.Add(child);
}
else
{
parent.Nodes.Add(child);
}
foreach (Index node in group.Where(x => x.paragraphs.Count == level + 1))
{
child.Nodes.Add(node.row.Field<string>("Value"));
}
List<Index> descendants = group.Where(x => x.paragraphs.Count > level + 1).ToList();
if (descendants.Count > 0)
{
MakeTreeRecursive(level + 1, descendants, child);
}
}
}
}
public class Index
{
public static List<Index> indexes { get; set; }
public List<string> paragraphs { get; set; }
public DataRow row { get; set; }
public Index() { }
public Index(DataTable dt)
{
Index.indexes = dt.AsEnumerable()
.Select(x => new Index() {
row = x,
paragraphs = x.Field<string>("Index")
.Split(new char[] {'.'}, StringSplitOptions.RemoveEmptyEntries)
.Select(y=> y).ToList()
}).ToList();
}
}
}
Here is solution if you only want the text
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
namespace WindowsFormsApplication1
{
public partial class Form1 : Form
{
DataTable dt = null;
public Form1()
{
InitializeComponent();
dt = new DataTable();
dt.Columns.Add("Index", typeof(string));
dt.Columns.Add("Value", typeof(string));
dt.Rows.Add(new object[] { "0001.", "aaaa" });
dt.Rows.Add(new object[] { "0001.0001.", "bbbb" });
dt.Rows.Add(new object[] { "0001.0002.", "cccc" });
dt.Rows.Add(new object[] { "0001.0002.0001.", "dddd" });
dt.Rows.Add(new object[] { "0001.0002.0002.", "eeee" });
dt.Rows.Add(new object[] { "0001.0003.", "ffff" });
dt.Rows.Add(new object[] { "0002.", "gggg" });
new Index(dt);
MakeTreeRecursive(0, Index.indexes, null);
treeView1.ExpandAll();
}
public void MakeTreeRecursive(int level, List<Index> rows, TreeNode parent)
{
TreeNode child = null;
var groups = rows
.OrderBy(x => x.paragraphs[level])
.GroupBy(x => x.paragraphs[level]);
foreach (var group in groups)
{
Index root = group.OrderBy(x => x.paragraphs.Count).First();
child = new TreeNode(root.row.Field<string>("Value"));
List<Index> descendants = group.Where(x => x.paragraphs.Count > level + 1).ToList();
if (descendants.Count() > 0)
{
MakeTreeRecursive(level + 1, descendants, child);
}
if (parent == null)
{
treeView1.Nodes.Add(child);
}
else
{
parent.Nodes.Add(child);
}
}
}
}
public class Index
{
public static List<Index> indexes { get; set; }
public List<string> paragraphs { get; set; }
public DataRow row { get; set; }
public Index() { }
public Index(DataTable dt)
{
Index.indexes = dt.AsEnumerable()
.Select(x => new Index()
{
row = x,
paragraphs = x.Field<string>("Index")
.Split(new char[] { '.' }, StringSplitOptions.RemoveEmptyEntries)
.Select(y => y).ToList()
}).ToList();
}
}
}
All methods was sourced from stackoverflow.com or stackexchange.com, is licensed under cc by-sa 2.5, cc by-sa 3.0 and cc by-sa 4.0