CODEWITHSUNDEEP
wpfbinding
MrTelly
MrTelly

Reputation: 14875

Changing which DependencyProperty I bind to at run time

I'm using WPF and have a data class which I bind to a control's DependencyProperties. I need to change the binding at run time under the control of a user. Ideally I'd like to be able to do something like this

myControl.SetBinding(UserControl.GetDependencyProperty("HeightProperty")
    , myBinding);

Of course GetDependencyProperty taking a string doesn't work, I've got around this by creating my own static class 

        public static DependencyProperty GetDP(string Name)
        {
            switch (Name)
            {
                case "Height": return UserControl.HeightProperty;
                case "Width": return UserControl.WidthProperty;
....
            }

Is there a better way?

Upvotes: 0

Views: 845

Answers (1)

Kent Boogaart
Kent Boogaart

Reputation: 178810

You haven't described how the user changes the target dependency property. Can you just store the DependencyPropertys themselves rather than strings? That way you don't have to do any conversion at all. Pseudo-code:

//just an array of all allowable properties
public DependencyProperty[] AllowedProperties { get; }

//the property the user has chosen
public DependencyProperty ChosenProperty { get; set; }

//called whenever ChosenProperty changes
private void OnChosenPropertyChanged()
{
    //redo binding here, using ChosenProperty as the target
}

Edit after comments: You can use DependencyPropertyDescriptor.FromName to get a DependencyProperty from its name, assuming you know the type of the owner:

var descriptor = DepedencyPropertyDescriptor.FromName(nameFromExcel, typeof(YourUserControl), typeof(YourUserControl));
var dependencyProperty = descriptor.DependencyProperty;

Upvotes: 1

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