Ahjesus获取自定义属性Attribute或属性的名称_.NET_编程开发_程序员俱乐部

1：设置自己的自定义属性

    public class NameAttribute:Attribute {
        private string _description;
        public NameAttribute(string description) {
            _description = description;
        }
        
        public string Description {
            get { return _description; }
        }
    }

2：设置获取属性或属性名的类

    /// <summary>
    /// 获取自定义属性Name或者属性名称
    /// </summary>
    /// <typeparam name="T">类型</typeparam>
    public class AttributeHelper<T> where T : new() {        
        /// <summary>
        /// 获取枚举类型自定义属性Name
        /// </summary>
        /// <param name="type">枚举</param>
        /// <returns></returns>
        public string NameFor(object type) {
            T test = (T)type;
            FieldInfo fieldInfo = test.GetType().GetField(test.ToString());
            object[] attribArray = fieldInfo.GetCustomAttributes(false);
            //IList<CustomAttributeData> list = fieldInfo.GetCustomAttributesData();
            string des = (attribArray[0] as NameAttribute).Description;
            return des;
        }

        /// <summary>
        /// 获取属性自定义属性Name
        /// </summary>
        /// <param name="predicate">表达式</param>
        /// <returns></returns>
        public string NameFor(Expression<Func<T, object>> expr) {
            string name = PropertyNameFor(expr);
            T et = new T();
            Type type = et.GetType();
            PropertyInfo[] properties = type.GetProperties();
            object[] attributes = null;
            foreach (PropertyInfo p in properties) {
                if (p.Name == name) {
                    attributes = p.GetCustomAttributes(typeof(NameAttribute), true);
                    break;
                }
            }//出自http://www.cnblogs.com/ahjesus 尊重作者辛苦劳动成果,转载请注明出处,谢谢!
            string des = ((NameAttribute)attributes[0]).Description;
            return des;
        }

        /// <summary>
        /// 获取属性的名称
        /// </summary>
        /// <param name="expr"></param>
        /// <returns></returns>
        public string PropertyNameFor(Expression<Func<T, object>> expr) {
            var rtn = "";
            if (expr.Body is UnaryExpression) {
                rtn = ((MemberExpression)((UnaryExpression)expr.Body).Operand).Member.Name;
            }//出自http://www.cnblogs.com/ahjesus 尊重作者辛苦劳动成果,转载请注明出处,谢谢!            
　　　　　　　else if (expr.Body is MemberExpression) {
                rtn = ((MemberExpression)expr.Body).Member.Name;
            }
            else if (expr.Body is ParameterExpression) {
                rtn = ((ParameterExpression)expr.Body).Type.Name;
            }
            return rtn;
        }
    }

3：设置测试实体类和枚举

    public class MyEntity {
        public MyEntity() {
            Name = "Jude";
            Age = 11;
        }
        [Name("姓名")]
        public string Name { get; set; }
        [Name("年龄")]
        public int Age { get; set; }
    }

    public enum MyEnum {
        [Name("欧洲")]
        Europe = 0,
        [Name("亚洲")]
        Asia = 1,
        [Name("美洲")]
        America = 2
    }

4:开始测试

    public partial class WebForm1 : System.Web.UI.Page {
        protected void Page_Load(object sender, EventArgs e) {
            AttributeHelper<MyEntity> myEntityAttr = new AttributeHelper<MyEntity>();
            MyEntity myEntity = new MyEntity();
            AttributeHelper<MyEnum> myEnumAttr = new AttributeHelper<MyEnum>();
            Response.Write(myEntityAttr.NameFor(it => it.Name) + ":" + myEntity.Name + "\n");//姓名:Jude
            Response.Write(myEntityAttr.NameFor(it => it.Age) + ":" + myEntity.Age + "\n");//年龄:11
            Response.Write(myEntityAttr.PropertyNameFor(it => it.Name) + ":" + myEntity.Name + "\n");//Name:Jude
            Response.Write(myEntityAttr.PropertyNameFor(it => it.Age) + ":" + myEntity.Age + "\n");//Age:11
            //出自http://www.cnblogs.com/ahjesus 尊重作者辛苦劳动成果,转载请注明出处,谢谢!
            Response.Write(myEnumAttr.NameFor(MyEnum.America) + ":" + MyEnum.America + "\n");//美洲:America
            Response.Write(myEnumAttr.NameFor(MyEnum.Asia) + ":" + MyEnum.Asia + "\n");//亚洲:Asia
            Response.Write(myEnumAttr.NameFor(MyEnum.Europe) + ":" + MyEnum.Europe + "\n");//欧洲:Europe
    
        }
    }