CODEWITHSUNDEEP
c#.netwinformsvisual-studio
Hamid Reza
Hamid Reza

Reputation: 485

How to bind a property of control to another control's property

I have two controls on my form(control1 and control2) that are located next to the each other. The width of control1 is variable.

Can I bind the Left Property of control2 to the width property of control1?

I wrote below code but it didn't work:

control2.DataBindings.Add(new Binding("Left", control1, "Width"));

Upvotes: 2

Views: 2493

Answers (4)

vvv
vvv

Reputation: 398

The simplest way to handle this I think is by EventHandlers:

public Form1()
    {
        InitializeComponent();

        panel2.SizeChanged +=panel2_SizeChanged;
    }

    private void button1_Click(object sender, EventArgs e)
    {
        panel2.Size = new Size(panel2.Size.Width * 2, panel2.Size.Height * 2);
    }

    void panel2_SizeChanged(object sender, EventArgs e)
    {
        panel1.Size = panel2.Size;
    }

Upvotes: 1

Sriram Sakthivel
Sriram Sakthivel

Reputation: 73502

control2.DataBindings.Add(new Binding("Left", control1, "Width"));//Your code

Your code doesn't work because there is no change notification going when chaning Width property, but Size does.

You can bind to Size but the problem is you need an int but Size property is of type Size, so you need to convert it also using Format event like this.

var binding = new Binding("Left", control1, "Size", true,DataSourceUpdateMode.Never);
binding.Format += (sender, args) =>
{
    if (args.DesiredType == typeof (int))
    {
        Size size = (Size) args.Value;
        args.Value = size.Width;
    }
};
control2.DataBindings.Add(binding);

Another way is to implement INotifyPropertyChanged in your source control. That should do the trick.

Upvotes: 2

vvv
vvv

Reputation: 398

It needs to implement INotifyPropertyChanged interface.

I look more deeper and it has three options

public enum DataSourceUpdateMode
{
  OnValidation,
  OnPropertyChanged,
  Never
}

Default is OnValidation, but the Width doesn't cause neither Validation neither PropertyChanged

An example of usage:

   panel1.DataBindings.Add(new Binding("Width", panel2, "Width", false,  DataSourceUpdateMode.OnPropertyChanged));

Upvotes: 0

Anuraj
Anuraj

Reputation: 19618

You can do that. Here is a snippet in this I am binding trackbar value to width of button

button1.DataBindings.Add(new Binding("width", trackBar1, "value"));

I tried with Textbox also, it is also working.

button1.DataBindings.Add(new Binding("left", textBox1, "Text"));

Upvotes: 0

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