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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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