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How to AllowColumnReorder programmatically on listview - C# .Net 1.1

Posted on 2008-06-16
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Last Modified: 2013-12-17
How to AllowColumnReorder programmatically in C# .Net 1.1???
Here is a working sample in VB.net:
http://bytes.com/forum/thread223912.html

My conversion does not work in C#, it causes a nullreference exception...
What's wrong???
using System;

using System.Drawing;

using System.Collections;

using System.ComponentModel;

using System.Windows.Forms;

using System.Data;

using System.Runtime.InteropServices;

using System.Diagnostics;
 

namespace WindowsApplication5

{

	/// <summary>

	/// Summary description for Form1.

	/// </summary>

	public class Form1 : System.Windows.Forms.Form

	{
 

		static int LVM_SETCOLUMNORDERARRAY = 0x103A;  //LVM_FIRST + 58;

		static int LVM_GETCOLUMNORDERARRAY = 0x103B;  //LVM_FIRST + 59;

//		[DllImport("user32.dll", EntryPoint="SendMessageA")]

//		static extern int ListViewColumnOrder(Int32 hwnd , Int32 Msg , Int32 wParam , Int32 lParam );

		[DllImport("user32.dll")]

		public static extern bool ListViewColumnOrder(IntPtr hWnd, Int32 msg, Int32 wParam, IntPtr lParam);

		
 

//		[DllImport("user32.dll")]

//		static extern bool SendMessage(IntPtr hWnd, Int32 msg, Int32 wParam,ref LVCOLUMN lParam);
 

		bool FirstTime = true;
 

		private System.Windows.Forms.Button button1;

		private System.Windows.Forms.ListView listView1;

		private System.Windows.Forms.ColumnHeader columnHeader1;

		private System.Windows.Forms.ColumnHeader columnHeader2;

		private System.Windows.Forms.ColumnHeader columnHeader3;

		/// <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()

		{

			System.Windows.Forms.ListViewItem listViewItem1 = new System.Windows.Forms.ListViewItem("fsdfdas");

			System.Windows.Forms.ListViewItem listViewItem2 = new System.Windows.Forms.ListViewItem("fsdfdsa");

			System.Windows.Forms.ListViewItem listViewItem3 = new System.Windows.Forms.ListViewItem("erterwtwer");

			this.button1 = new System.Windows.Forms.Button();

			this.listView1 = new System.Windows.Forms.ListView();

			this.columnHeader1 = new System.Windows.Forms.ColumnHeader();

			this.columnHeader2 = new System.Windows.Forms.ColumnHeader();

			this.columnHeader3 = new System.Windows.Forms.ColumnHeader();

			this.SuspendLayout();

			// 

			// button1

			// 

			this.button1.Location = new System.Drawing.Point(72, 248);

			this.button1.Name = "button1";

			this.button1.Size = new System.Drawing.Size(120, 16);

			this.button1.TabIndex = 0;

			this.button1.Text = "button1";

			this.button1.Click += new System.EventHandler(this.button1_Click);

			// 

			// listView1

			// 

			this.listView1.AllowColumnReorder = true;

			this.listView1.Columns.AddRange(new System.Windows.Forms.ColumnHeader[] {

																						this.columnHeader1,

																						this.columnHeader2,

																						this.columnHeader3});

			this.listView1.GridLines = true;

			this.listView1.Items.AddRange(new System.Windows.Forms.ListViewItem[] {

																					  listViewItem1,

																					  listViewItem2,

																					  listViewItem3});

			this.listView1.Location = new System.Drawing.Point(0, 8);

			this.listView1.MultiSelect = false;

			this.listView1.Name = "listView1";

			this.listView1.Size = new System.Drawing.Size(288, 240);

			this.listView1.TabIndex = 1;

			this.listView1.View = System.Windows.Forms.View.Details;

			// 

			// columnHeader2

			// 

			this.columnHeader2.Text = "ColumnHeader2";

			// 

			// columnHeader3

			// 

			this.columnHeader3.Text = "ColumnHeader3";

			// 

			// Form1

			// 

			this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);

			this.ClientSize = new System.Drawing.Size(292, 273);

			this.Controls.Add(this.listView1);

			this.Controls.Add(this.button1);

			this.Name = "Form1";

			this.Text = "Form1";

			this.ResumeLayout(false);
 

		}

		#endregion
 

		/// <summary>

		/// The main entry point for the application.

		/// </summary>

		[STAThread]

		static void Main() 

		{

			Application.Run(new Form1());

		}
 

		int c=0;

		Int32 [] sortorder;

		private void button1_Click(object sender, System.EventArgs e)

		{

		

			//sortorder=new int(ListView1.Columns.Count - 1);
 

			if(FirstTime){

				c = 2;

				FirstTime = false;

				sortorder=new Int32[3]; 

			}

			if( c > 2 )c = 0;

			sortorder[0] = c;

			c += 1;

			if( c > 2) c = 0;

			sortorder[1] = c;

			c += 1;

			if( c > 2 )c = 0;

			sortorder[2] = c;
 

			SetColumnOrder(listView1, sortorder);

		

		}
 

		public void SetColumnOrder(ListView ListViewToReorder , int[] SortOrder )

		{

			if( SortOrder.Length < 1 )return;

			if( SortOrder.Length > ListViewToReorder.Columns.Count) return;

			Int32 liSetColumnOrderArray = LVM_SETCOLUMNORDERARRAY;

			Int32 handle=listView1.Handle.ToInt32();

			Int32 slen=SortOrder.Length;

			this.Handle 

			int liSuccess = ListViewColumnOrder(handle, liSetColumnOrderArray, slen, SortOrder[0]);

			if( liSuccess!=0) 

			{

				listView1.Refresh();

			}

		}
 

}

}

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Question by:cosie
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