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WIndows Form Inheritance

Posted on 2008-10-21
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Last Modified: 2013-12-17
Experts,

Is Windows Forms inheritance a good idea?  I'm experimenting with it, but the derived forms always have locked controls.  Ideas?
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Question by:NigelRocks
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angus_young_acdc earned 500 total points
ID: 22774240
You can set the controls to not be locked.  In the base form change the controls Modifiers property from Private to whichever setting best suits your needs. Public would mean that every form that inherited from it would have the control and could have their own code
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by:angus_young_acdc
ID: 22774241
Oh and to answer your other question; yes it is a very good idea.  It will keep all forms consistent and save time/effort.
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Author Closing Comment

by:NigelRocks
ID: 31508643
Angus,

Your technical skills match your awesome guitar playing.  Tell Malcolm I don't want to see Phil Rudd leave the band again.  Don't make me come down there.
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by:NigelRocks
ID: 22775711
I spoke too soon, Angus.  Overwhelmed by encountering your rock 'n' roll greatness, I didn't test your solution enough.  I still have locked controls.  Do I need to talk to Brian Johnson?
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Expert Comment

by:angus_young_acdc
ID: 22776295
Haha that made me laugh, certainly a good way to brighten up an otherwise dull day.

Are you sure you are changing all of your controls?  Everything in the form you inherit from has to be changed, otherwise it is locked out.  Although that's handy for certain ones (eg an exit button) which won't change.

For those about to Rock....
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Author Comment

by:NigelRocks
ID: 22776404
I've attached all the code for the parent form.  I still don't see where the problem is.
namespace UI_Inheritance_Test
{
    public partial class Parent_Form
    {
        /// <summary>
        /// Required designer variable.
        /// </summary>
        public 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>
        public void InitializeComponent()
        {
            this.button1 = new System.Windows.Forms.Button();
            this.comboBox1 = new System.Windows.Forms.ComboBox();
            this.SuspendLayout();
            // 
            // button1
            // 
            this.button1.Location = new System.Drawing.Point(35, 19);
            this.button1.Name = "button1";
            this.button1.Size = new System.Drawing.Size(88, 50);
            this.button1.TabIndex = 0;
            this.button1.Text = "button1";
            this.button1.UseVisualStyleBackColor = true;
            // 
            // comboBox1
            // 
            this.comboBox1.FormattingEnabled = true;
            this.comboBox1.Location = new System.Drawing.Point(57, 107);
            this.comboBox1.Name = "comboBox1";
            this.comboBox1.Size = new System.Drawing.Size(143, 21);
            this.comboBox1.TabIndex = 1;
            this.comboBox1.Text = "Parent Form";
            // 
            // Parent_Form
            // 
            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.ClientSize = new System.Drawing.Size(292, 266);
            this.Controls.Add(this.comboBox1);
            this.Controls.Add(this.button1);
            this.Name = "Parent_Form";
            this.Text = "Parent Form";
            this.Load += new System.EventHandler(this.Parent_Form_Load);
            this.ResumeLayout(false);
 
        }
 
        #endregion
 
        public System.Windows.Forms.Button button1;
        public System.Windows.Forms.ComboBox comboBox1;
    }
}

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Expert Comment

by:angus_young_acdc
ID: 22776584
Are you setting the Modifier property via the Design view for the form?  And have you double checked that it is not set to Private?
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Author Comment

by:NigelRocks
ID: 22779539
I'm not seeing a "modifier" property on any of my forms.
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Expert Comment

by:angus_young_acdc
ID: 22783934
Its not on the form, it is on the individual objects.  So you would select each button, combobox etc and change its Modifier.  Best way is just to highlight them all and do it, saves time :)
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Author Comment

by:NigelRocks
ID: 22788485
I understand the part about the individual objects and not the form.  The two objects in the parent form are listed as follows:

        public System.Windows.Forms.Button button1;
        public System.Windows.Forms.ComboBox comboBox1;

Yet, they are still locked in the the second-level form.  I tried the "protected" keyword, but got the same results.
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Author Comment

by:NigelRocks
ID: 22801637
Some people say that this problem with the locked controls is a known bug and that they get around it by writing user controls.  Anyone else?
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