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C# -- SuspendLayout() FAILS ?

Posted on 2009-07-15
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Last Modified: 2013-12-17
I created a new WindowsAPP, added the below "SuspendLayout" so the "textBox1_TextChanged" EVENT does not run during the FormLoad "public Form1()", ran the app, and the "MessageBox" still displays during the form load.

How can I get the "MessageBox" to only display after formLoad ?
----------------------------------------------------------
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            this.SuspendLayout();
            textBox1.Text = "Test";
        }

        private void textBox1_TextChanged(object sender, EventArgs e)
        {
            MessageBox.Show("text changed");
        }
    }
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Question by:finance_teacher
  • 2
3 Comments
 
LVL 15

Expert Comment

by:jinal
ID: 24861478

public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            textBox1.TextChanged -= new EventHandler(textBox1_TextChanged);
            textBox1.Text = "Test";
            textBox1.TextChanged += new EventHandler(textBox1_TextChanged);
        }
 
        private void textBox1_TextChanged(object sender, EventArgs e)
        {
            MessageBox.Show("text changed");
        }
    }

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Accepted Solution

by:
Mike Tomlinson earned 500 total points
ID: 24861547
SuspendLayout() suppresses events affecting the LAYOUT of the control (such as size, position, etc)...

You could toggle a boolean flag in the Shown() event of your form like this:


    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            textBox1.Text = "Test";
        }
 
        private Boolean Loading = true;
 
        private void Form1_Shown(object sender, EventArgs e)
        {
            this.Loading = false;
        }
 
        private void textBox1_TextChanged(object sender, EventArgs e)
        {
            if (this.Loading) return;
 
            MessageBox.Show("text changed");
        }
 
    }

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LVL 85

Expert Comment

by:Mike Tomlinson
ID: 24861587
Another option....

        private void textBox1_TextChanged(object sender, EventArgs e)
        {
            if (!this.IsHandleCreated) return;

            MessageBox.Show("text changed");
        }
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