9.如何把枚举绑定到ComboBox控件上

1.添加ComboBox控件的枚举绑定扩展类

/// <summary>
    /// 绑定源的元素实体
    /// </summary>
    /// <typeparam name="T"></typeparam>
    public class BindableSourceItem<T>
    {
        /// <summary>
        /// 描述
        /// </summary>
        public string Description { get; set; }

        /// <summary>
        /// 值
        /// </summary>
        public T Value { get; set; }

        public BindableSourceItem()
        {

        }
        public BindableSourceItem(string description, T value)
        {
            Description = description;
            Value = value;
        }
    }

 

 

/// <summary>
    /// ComboBox控件的枚举绑定扩展类
    /// </summary>
    public static class ComboBoxExtension
    {
        /// <summary>
        /// 枚举绑定到ComboBox上
        /// </summary>
        /// <typeparam name="T">枚举类型</typeparam>
        /// <param name="comboBox">comboBox</param>
        /// <param name="filter">条件</param>
        /// <param name="icon">图标</param>
        /// <exception cref="Exception"></exception>
        public static void Binding<T>(this ComboBox comboBox, Func<T, bool> filter = null, bool icon = false) where T : struct
        {
            var type = typeof(T);
            if (!type.IsEnum)
            {
                throw new Exception($"{type.FullName}必须为枚举类型");
            }

            var items = type.GetBindableSourceItems<T>(filter);
            comboBox.DoBinding(items, icon);
        }



        public static IEnumerable<BindableSourceItem<T>> GetBindableSourceItems<T>(this object obj, Func<T, bool> filter = null) where T : struct
        {
            var type = typeof(T);
            if (!type.IsEnum)
            {
                throw new Exception($"{type.FullName}必须为枚举类型");
            }

            var items = type.GetEnumValues().Cast<T>().Select(x => new BindableSourceItem<T>()
            {
                Description = x.GetEnumDescription(),
                Value = x,

            });

            if (filter != null)
            {
                items = items.Where(p => filter(p.Value));
            }

            return items;
        }


        public static string GetEnumDescription(this object obj)
        {
            Assert.NotNull(obj);
            var type = obj.GetType();
            if (!type.IsEnum)
            {
                throw new Exception($"{type.FullName}必须为枚举类型");
            }

            FieldInfo fieldInfo = obj.GetType().GetField(obj.ToString());
            if (fieldInfo != null)
            {
                DescriptionAttribute attribute = Attribute.GetCustomAttribute(fieldInfo, typeof(DescriptionAttribute)) as DescriptionAttribute;
                if (attribute != null)
                {
                    return attribute.Description;
                }
                else
                {
                    return fieldInfo.Name;
                }
            }

            return string.Empty;
        }


        public static void DoBinding<T>(this ComboBox comboBox, IEnumerable<BindableSourceItem<T>> items, bool icon = false)
        {
            if (icon)
            {
                FrameworkElementFactory f = new FrameworkElementFactory(typeof(Image));
                System.Windows.Data.Binding binding = new System.Windows.Data.Binding();
                binding.Path = new PropertyPath(nameof(BindableSourceItem<T>.Description));
                f.SetBinding(Image.SourceProperty, binding);
                f.SetValue(FrameworkElement.HeightProperty, 30.0);
                var template = new DataTemplate { VisualTree = f };
                template.Seal();
                comboBox.ItemTemplate = template;
            }
            else
            {
                comboBox.DisplayMemberPath = nameof(BindableSourceItem<T>.Description);
            }

            comboBox.SelectedValuePath = nameof(BindableSourceItem<T>.Value);
            comboBox.ItemsSource = items;
        }
    }

2.添加一个枚举

/// <summary>
    /// 图像缩放模式
    /// </summary>
    public enum ZoomMode
    {
        [Description("自适应")]
        Uniform,
        [Description("100%")]
        Original,
        [Description("200%")]
        Percent200,
        [Description("300%")]
        Percent300,
        [Description("400%")]
        Percent400,
        [Description("500%")]
        Percent500,
        [Description("600%")]
        Percent600,
        [Description("700%")]
        Percent700,
        [Description("800%")]
        Percent800,
    }

3.使用

private void ComboBoxLodeAction(ComboBox obj)
        {
            obj.Binding<ZoomMode>();
        }