[C#] Inherting TabPage & TabControl

[KXM]

I hit a wall...

In a nut shell, I am trying to inherit System.Windows.Forums.TabControl & ...TabPage. I order to add a custom prop field. Now all indications point to it working. (IntelliSence displays custom prop, and the form designer indicates the inherited control is correctly being used)

How ever <tabcontrolername>.SelectedTab.<customprop> is always blank (null).

In order to spare you all the ins and outs, I created a generic project describing what I'm trying to do. In the sample the custom prop is a string (to keep it simple), however in the real app it's an instance of a custom struct.

So, any ideas as to what I'm doing wrong?

Base form code:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace TabStorage
{
	public partial class fmMain : Form
	{
		public fmMain()
		{
			InitializeComponent();
		}

		private void btNew_Click(object sender, EventArgs e)
		{
			NTabPage np = new NTabPage();

			np.Text = "New Tab";
			np.PageMode = "Custom Tab Prop String";

			tcTabControl.TabPages.Add(np);

			np = null;
		}

		private void btInfo_Click(object sender, EventArgs e)
		{
			MessageBox.Show(tcTabControl.SelectedTab.PageMode);
		}

	}
}

Win Forms Designer code:

namespace TabStorage
{
	partial class fmMain
	{
		/// <summary>
		/// Required designer variable.
		/// </summary>
		private System.ComponentModel.IContainer components = null;

		/// <summary>
		/// Clean up any resources being used.
		/// </summary>
		/// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
		protected override void Dispose(bool disposing)
		{
			if (disposing && (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.btNew = new System.Windows.Forms.Button();
			this.btInfo = new System.Windows.Forms.Button();
			this.tcTabControl = new TabStorage.NTabControl();
			this.SuspendLayout();
			// 
			// btNew
			// 
			this.btNew.Location = new System.Drawing.Point(0, 12);
			this.btNew.Name = "btNew";
			this.btNew.Size = new System.Drawing.Size(75, 23);
			this.btNew.TabIndex = 0;
			this.btNew.Text = "New Tab";
			this.btNew.UseVisualStyleBackColor = true;
			this.btNew.Click += new System.EventHandler(this.btNew_Click);
			// 
			// btInfo
			// 
			this.btInfo.Location = new System.Drawing.Point(0, 41);
			this.btInfo.Name = "btInfo";
			this.btInfo.Size = new System.Drawing.Size(75, 23);
			this.btInfo.TabIndex = 1;
			this.btInfo.Text = "Get Info";
			this.btInfo.UseVisualStyleBackColor = true;
			this.btInfo.Click += new System.EventHandler(this.btInfo_Click);
			// 
			// tcTabControl
			// 
			this.tcTabControl.Location = new System.Drawing.Point(81, 12);
			this.tcTabControl.Name = "tcTabControl";
			this.tcTabControl.PageMode = null;
			this.tcTabControl.SelectedIndex = 0;
			this.tcTabControl.Size = new System.Drawing.Size(229, 328);
			this.tcTabControl.TabIndex = 2;
			// 
			// fmMain
			// 
			this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
			this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
			this.ClientSize = new System.Drawing.Size(322, 352);
			this.Controls.Add(this.tcTabControl);
			this.Controls.Add(this.btInfo);
			this.Controls.Add(this.btNew);
			this.Name = "fmMain";
			this.Text = "Tab Storage";
			this.ResumeLayout(false);

		}

		#endregion

		private System.Windows.Forms.Button btNew;
		private System.Windows.Forms.Button btInfo;
		private NTabControl tcTabControl;
	}

	public class NTabControl : System.Windows.Forms.TabControl
	{
		private string m_PageMode;
		private NTabPage m_TabPage = new NTabPage();

		public string PageMode
		{
			get { return m_PageMode; }
			set { m_PageMode = value; }
		}

		public new NTabPage SelectedTab
		{
			get { return m_TabPage; }
			set { m_TabPage = value; }
		}
	}


	public class NTabPage : System.Windows.Forms.TabPage
	{
		private string m_PageMode;

		public string PageMode
		{
			get { return m_PageMode; }
			set { m_PageMode = value; }
		}
	}
}

The full poroject in a zip.

TabStorage.zipFetching info...

[azcodemonkey]

In your NTabPage definition, you're SelectedTab property isn't correct.

	public class NTabControl : System.Windows.Forms.TabControl
	{
		private string m_PageMode;

		public string PageMode
		{
			get { return m_PageMode; }
			set { m_PageMode = value; }
		}

		public new NTabPage SelectedTab
		{
			get { return base.SelectedTab as NTabPage; }
			set { base.SelectedTab = value; }
		}
	}

[KXM]

(As you already know) That worked likle a charm!!!

Thanks so much for the fast reply!

[KXM]

LMAO, you also helped me fix another problem.

tcMain.TabPages.Remove(tcMain.SelectedTab);

Wouldn't work, and I couldn't figure out why.

But now it makes much more since base.SelectedTab adds all the pase properties of the tab control to the SelectedTab prop.

Thanks again!

[azcodemonkey]

Glad I could be of assistance. Do you understand why that was the problem?