CentralizedControl/HandyControl/HandyControl_Shared/Controls/Attach/GridViewAttach.cs

using System.Windows;
using HandyControl.Data;

namespace HandyControl.Controls;

public class GridViewAttach
{
    public static readonly DependencyProperty ColumnHeaderHeightProperty = DependencyProperty.RegisterAttached(
        "ColumnHeaderHeight", typeof(double), typeof(GridViewAttach), new PropertyMetadata(ValueBoxes.Double0Box));

    public static void SetColumnHeaderHeight(DependencyObject element, double value)
        => element.SetValue(ColumnHeaderHeightProperty, value);

    public static double GetColumnHeaderHeight(DependencyObject element)
        => (double) element.GetValue(ColumnHeaderHeightProperty);
}