1）RingLoading.cs代码如下；
[code]using System.Windows;using System.Windows.Controls;namespace WPFDevelopers.Controls{ public class RingLoading : Control { // Using a DependencyProperty as the backing store for IsStart. This enables animation, styling, binding, etc... public static readonly DependencyProperty IsStartProperty = DependencyProperty.Register("IsStart", typeof(bool), typeof(RingLoading), new PropertyMetadata(default)); // Using a DependencyProperty as the backing store for ProgressValue. This enables animation, styling, binding, etc... public static readonly DependencyProperty ProgressValueProperty = DependencyProperty.Register("ProgressValue", typeof(double), typeof(RingLoading), new PropertyMetadata(0d, OnProgressValueChangedCallBack)); // Using a DependencyProperty as the backing store for Progress. This enables animation, styling, binding, etc... internal static readonly DependencyProperty ProgressProperty = DependencyProperty.Register("Progress", typeof(string), typeof(RingLoading), new PropertyMetadata(default)); // Using a DependencyProperty as the backing store for Maximum. This enables animation, styling, binding, etc... public static readonly DependencyProperty MaximumProperty = DependencyProperty.Register("Maximum", typeof(double), typeof(RingLoading), new PropertyMetadata(100d, OnMaximumPropertyChangedCallBack)); // Using a DependencyProperty as the backing store for Description. This enables animation, styling, binding, etc... public static readonly DependencyProperty DescriptionProperty = DependencyProperty.Register("Description", typeof(string), typeof(RingLoading), new PropertyMetadata(default)); static RingLoading() { DefaultStyleKeyProperty.OverrideMetadata(typeof(RingLoading), new FrameworkPropertyMetadata(typeof(RingLoading))); } public bool IsStart { get => (bool)GetValue(IsStartProperty); set => SetValue(IsStartProperty, value); } public double ProgressValue { get => (double)GetValue(ProgressValueProperty); set => SetValue(ProgressValueProperty, value); } internal string Progress { get => (string)GetValue(ProgressProperty); set => SetValue(ProgressProperty, value); } public double Maximum { get => (double)GetValue(MaximumProperty); set => SetValue(MaximumProperty, value); } public string Description { get => (string)GetValue(DescriptionProperty); set => SetValue(DescriptionProperty, value); } private static void OnProgressValueChangedCallBack(DependencyObject d, DependencyPropertyChangedEventArgs e) { if (!(d is RingLoading control)) return; if (!double.TryParse(e.NewValue?.ToString(), out var value)) return; var progress = value / control.Maximum; control.SetCurrentValue(ProgressProperty, progress.ToString("P0")); } private static void OnMaximumPropertyChangedCallBack(DependencyObject d, DependencyPropertyChangedEventArgs e) { if (!(d is RingLoading control)) return; if (!double.TryParse(e.NewValue?.ToString(), out var maxValue)) return; if (maxValue
