CODEWITHSUNDEEP
c#winformsdata-binding
peter p
peter p

Reputation: 798

C# how to implement databinding without Control?

Is there a simple way to implement databinding when neither of both classes is of type Control?

In my case, I would like to bind a variable to a property of a custom ToolStripButton.

EDIT for clarification: when binding to a Control, I can use Control's DataBindings collection. However, I am searching for a way to bind properties regardless of the source and target Type.

EDIT: using winforms

Upvotes: 7

Views: 5335

Answers (6)

Larry
Larry

Reputation: 18051

There is another quick and simple solution which consists in creating properties in the Form, and bind them:

public MyForm : Form
{
    ...

    public bool CanDelete
    { 
        get { return deleteToolStripButton.Enabled; }
        set { deleteToolStripButton.Enabled = value; }
    }

    public MyForm()
    {
        ...
        this.DataBindings.Add("CanDelete", this.MyModel, "DeleteAllowed",
                              false, DataSourceUpdateMode.Never);
        ...
    }
}

Assuming that MyModel contains a DeleteAllowed property which notifies its changes.

Upvotes: 0

richn
richn

Reputation: 164

I use this Implemetation of IBindableComponent on the ToolStripButton, found here. The BindableToolStripButton allows you to use Databinding like with a normal Control.

[ToolStripItemDesignerAvailability(ToolStripItemDesignerAvailability.ToolStrip | ToolStripItemDesignerAvailability.StatusStrip)]
public class BindableToolStripButton : ToolStripButton, IBindableComponent
{

    public BindableToolStripButton()
        : base() { }
    public BindableToolStripButton(String text)
        : base(text) { }
    public BindableToolStripButton(System.Drawing.Image image)
        : base(image) { }
    public BindableToolStripButton(String text, System.Drawing.Image image)
        : base(text, image) { }
    public BindableToolStripButton(String text, System.Drawing.Image image, EventHandler onClick)
        : base(text, image, onClick) { }
    public BindableToolStripButton(String text, System.Drawing.Image image, EventHandler onClick, String name)
        : base(text, image, onClick, name) { }



    #region IBindableComponent Members
    private BindingContext bindingContext;
    private ControlBindingsCollection dataBindings;

    [Browsable(false)]
    public BindingContext BindingContext
    {
        get
        {
            if (bindingContext == null)
            {
                bindingContext = new BindingContext();
            }
            return bindingContext;
        }
        set
        {
            bindingContext = value;
        }
    }
    [DesignerSerializationVisibility(DesignerSerializationVisibility.Content)]
    public ControlBindingsCollection DataBindings
    {
        get
        {
            if (dataBindings == null)
            {
                dataBindings = new ControlBindingsCollection(this);
            }
            return dataBindings;
        }
    }
    #endregion

}

Assuming you have a class MyClass implementing INotifyPropertyChanged, use it just like you would when binding to a control property:

bindableToolStripButton1.DataBindings.Add("Enabled", myClass1, "MyBooleanProperty");

Upvotes: 5

Filip Kunc
Filip Kunc

Reputation: 621

I written some basic databinding stuff through reflection. It works on any object and doesn't need to implement something special (no INotifyPropertyChanged, it just works) it is part of my editor at http://github.com/filipkunc/opengl-editor-cocoa look at HotChocolate/Bindings (like re-implementation of Cocoa KVC, KVO into .NET) folder. You can see it in action in HotChocolateTest project.

Upvotes: 0

John K
John K

Reputation: 28927

For similar behaviour like Controls being bound to object properties, for any Type you can implement the same interfaces.

Based on that thought, you can subclass ToolStripButton (or desired Type to have bindings) and implement IBindableComponent for it. This works for all kinds of source and target Types as long as they're not sealed. For example, your tool strip button:

public class BindableToolStripButton : ToolStripButton,  IBindableComponent {
    //...

This will cause the BindableToolStripButton to have its own .DataBindings property whereas the base ToolStripButton class doesn't have such a propery.

You would need to follow through on filling out implementation details using examples seen here from Microsoft for ISite, IBindableComponent, IComponent and any inherited interfaces.

Then you would add Binding instances to any instance of BindableToolStripButton.

(Note: I only have fragements so will make my first community wiki post - and we'll see how that goes... )

Upvotes: 1

Reed Copsey
Reed Copsey

Reputation: 564931

You can probably do this by using Truss.

Truss provides WPF-style databinding for any class that implements INotifyPropertyChanged. It gives you a bit more flexibility in this, since it doesn't restrict the classes to being derived from a specific base class.

Upvotes: 8

Tony The Lion
Tony The Lion

Reputation: 63310

Use dependency properties (your property in your ToolStripButton should be) and create a property for your variable in your other class and create a binding and set it to the property of your ToolstripButton.

I guess that's about the easiest way to do it.

EDIT: That's only for WPF...

Else implement INotifyPropertyChanged and when your variable changes, it should automatically change in your ToolStripButton.

Upvotes: 1

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