WpfExtensionMethods.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Controls.Primitives;

namespace WpfExtensionMethods
{
    public static class Extensions
    {
        public static T SetDock<T>(this T element, Dock dock) where T : UIElement
        {
            DockPanel.SetDock(element, dock);

            return element;
        }

        public static T SetColumn<T>(this T element, int value) where T : UIElement
        {
            Grid.SetColumn(element, value);

            return element;
        }

        public static T SetValue_<T>(this T factory, DependencyProperty dp, object value) where T : FrameworkElementFactory
        {
            factory.SetValue(dp, value);

            return factory;
        }

        public static T AppendChildren<T>(this T factory, params FrameworkElementFactory[] children) where T : FrameworkElementFactory
        {
            foreach (var child in children)
                factory.AppendChild(child);

            return factory;
        }

        public static T SetVisualTree<T>(this T template, FrameworkElementFactory factory) where T : FrameworkTemplate
        {
            template.VisualTree = factory;

            return template;
        }

        public static T1 SetItemsPanel<T1, T2>(this T1 control, T2 template) where T1 : ItemsControl where T2 : ItemsPanelTemplate
        {
            control.ItemsPanel = template;

            return control;
        }

        public static T AddItems<T>(this T control, params object[] items) where T : ItemsControl
        {
            foreach (var item in items)
                control.Items.Add(item);

            return control;
        }

        public static T AddSelectionChanged<T>(this T obj, RoutedEventHandler handler) where T : TextBoxBase
        {
            obj.SelectionChanged += handler;

            return obj;
        }

        public static T1 AddChildren<T1>(this T1 panel, params UIElement[] elements) where T1 : Panel
        {
            foreach (var elt in elements)
                panel.Children.Add(elt);

            return panel;
        }

        public static T1 AddSetter<T1, T2>(this T1 data_trigger, T2 setter_base) where T1 : DataTrigger where T2 : SetterBase
        {
            data_trigger.Setters.Add(setter_base);

            return data_trigger;
        }

        public static T1 AddTrigger<T1, T2>(this T1 style, T2 trigger_base) where T1 : Style where T2 : TriggerBase
        {
            style.Triggers.Add(trigger_base);

            return style;
        }

    }
}