如何在MVVM模式wpf中绑定StrokeDashArray属性

Question

I have WPF application where I have in one canvas some lines to be need to be dotted line, and some is need to be normal line. My question is what exactly type is StrokeDashArray . In msdn I see is use DoubleCollection but is from System.Windows.Media. How can make property for StrokeDashArray used good practice in MVVM pattern.

Answer 1

If you want to bind to the dash array then it's a DoubleCollection, so you do something like this:

    private DoubleCollection _Dashes = new DoubleCollection { 1, 2 };
    public DoubleCollection Dashes
    {
        get { return this._Dashes;}
        set { this._Dashes = value; RaisePropertyChanged(); }
    }

And then in XAML:

    <Line Stroke="Black" StrokeThickness="2" StrokeDashArray="{Binding Dashes}" X1="0" Y1="50" X2="100" Y2="50"/>

If you're creating a dynamic array of Canvas elements then you'll need to create an ItemsControl and set ItemsControl.Panel to be a Canvas. Then you'll usually use Item.Template to declare the line for each element along with a Style that chooses between your different line/dash types using Data Triggers.