Re: Custom Sorting a DataTable Using DataGrid
From: ClayB [Syncfusion] (clayb_at_syncfusion.com)
Date: 08/18/04
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Date: Wed, 18 Aug 2004 16:04:31 -0400
I think you should be able to do this creating a wrapper class for your
column that implements IComparable. Here is a little sample that sorts
columns based on string length instead of the default sorting.
==============
Clay Burch, .NET MVP
Visit www.syncfusion.com for the coolest tools
using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
namespace GDBGDataView
{
/// <summary>
/// Summary description for Form1.
/// </summary>
public class Form1 : System.Windows.Forms.Form
{
private System.Windows.Forms.DataGrid dataGrid1;
/// <summary>
/// Required designer variable.
/// </summary>
private System.ComponentModel.Container components = null;
public Form1()
{
//
// Required for Windows Form Designer support
//
InitializeComponent();
//
// TODO: Add any constructor code after InitializeComponent call
//
}
/// <summary>
/// Clean up any resources being used.
/// </summary>
protected override void Dispose( bool disposing )
{
if( disposing )
{
if (components != null)
{
components.Dispose();
}
}
base.Dispose( disposing );
}
#region Windows Form Designer generated code
/// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
private void InitializeComponent()
{
this.dataGrid1 = new System.Windows.Forms.DataGrid();
((System.ComponentModel.ISupportInitialize)(this.dataGrid1)).BeginInit();
this.SuspendLayout();
//
// dataGrid1
//
this.dataGrid1.Anchor =
((System.Windows.Forms.AnchorStyles)((((System.Windows.Forms.AnchorStyles.To
p | System.Windows.Forms.AnchorStyles.Bottom)
| System.Windows.Forms.AnchorStyles.Left)
| System.Windows.Forms.AnchorStyles.Right)));
this.dataGrid1.DataMember = "";
this.dataGrid1.HeaderForeColor = System.Drawing.SystemColors.ControlText;
this.dataGrid1.Location = new System.Drawing.Point(24, 24);
this.dataGrid1.Name = "dataGrid1";
this.dataGrid1.Size = new System.Drawing.Size(248, 224);
this.dataGrid1.TabIndex = 0;
//
// Form1
//
this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
this.ClientSize = new System.Drawing.Size(292, 266);
this.Controls.Add(this.dataGrid1);
this.Name = "Form1";
this.Text = "Form1";
this.Load += new System.EventHandler(this.Form1_Load);
((System.ComponentModel.ISupportInitialize)(this.dataGrid1)).EndInit();
this.ResumeLayout(false);
}
#endregion
/// <summary>
/// The main entry point for the application.
/// </summary>
[STAThread]
static void Main()
{
Application.Run(new Form1());
}
private void Form1_Load(object sender, System.EventArgs e)
{
DataTable dt = new DataTable("MyTable");
int nCols = 4;
int nRows = 10;
for(int i = 0; i < nCols; i++)
dt.Columns.Add(new DataColumn(string.Format("Col{0}", i),
typeof(MyObject)));
Random r = new Random();
for(int i = 0; i < nRows; ++i)
{
DataRow dr = dt.NewRow();
for(int j = 0; j < nCols; j++)
dr[j] = new MyObject("row" + new string('a', 1 + r.Next(10)));
dt.Rows.Add(dr);
}
this.dataGrid1.DataSource = dt;
}
}
public class MyObject : IComparable
{
public MyObject(string s)
{
this.s = s;
}
public override string ToString()
{
return s;
}
string s;
public string Val
{
get{return s;}
set{s = value;}
}
public int CompareTo(object obj)
{
return this.ToString().Length - obj.ToString().Length;
}
}
}
"Dean Rettig" <rettigcd@bigfoot.com> wrote in message
news:f678be33.0408181107.14159850@posting.google.com...
> I have a DataTable with several columns. One column is a string that
> represents distances.(1 foot, 5 meters, 3 cm, etc) I want to click on
> the column header and have the rows sort based on the distances: 3cm,
> 1 foot, 5 meters.
>
> I know how to create the "sort value" of each distance but I don't
> know how to make the column use a "sort value" instead of the normal
> string value.
>
> Research shows lots of people sorting ArrayLists but I also want to do
> normal sorts on other columns.
>
> Possible solutions that I've come up with include:
>
> 1) creating a hidden column that contains the "Sort Value" and trying
> to redirect the table to sort on a different column than I clicked on.
>
> 2) storing custom objects with the IComparable interface in the
> "distance" column but I can't figure out how to get the
> TextEditControl to load the data into my new object nor display the
> data as text.
>
> 3) Derive a class from String and override the CompareTo function.
>
> 4) Write a new GridDataColumnStyle class that displays distance
> information.
>
> Are any of these on the right track. I've spent 8 hours on this and
> my head is going to explode if I don't get it figured out soon.
>
> thanks,
> Dean
>
>
> am I close?
- Next message: Herfried K. Wagner [MVP]: "Re: OpenFileDialog (C#)"
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- In reply to: Dean Rettig: "Custom Sorting a DataTable Using DataGrid"
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- Reply: ClayB [Syncfusion]: "Re: Custom Sorting a DataTable Using DataGrid"
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- Reply: Dean Rettig: "Re: Custom Sorting a DataTable Using DataGrid"
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