[AttributeUsage(AttributeTargets.Class | AttributeTargets.Field | AttributeTargets.Method)]
        public class PowerAttribute : Attribute
        {
            /// <summary>
            /// 对页面内控件进行权限判断，权限的字符串组成:URL+"?id"+Control.ID
            ///     例如:/page/index?id=tbName
            /// </summary>
            /// <param name="pType"></param>
            /// <param name="control"></param>
            public PowerAttribute(PowerType pType, params WebControl[] control)
            {
                for (int i = control.Length; --i >= 0; )
                {
                    WebControl Control = control.GetValue(i) as WebControl;
                    if (Control != null)
                        if (HasPower(string.Concat(WebHelper.WebRequest.Path, "?id=", Control.ID)) == -1)//判断权限
                            if (pType == PowerType.Visible)
                                Control.Visible = false;
                            else
                                Control.Enabled = false;
                }
            }

public int HasPower(string path)
            {
                return -1;

}

/// <summary>
            /// 获得控件的权限，1 具有权限，0 用户超时，-1 没有权限
            /// </summary>
            /// <param name="control"></param>
            /// <param name="Field"></param>
            public PowerAttribute(WebControl control, ref int Field)
            {
                Field = HasPower(string.Concat(WebHelper.WebRequest.Path, "?id=", control.ID));
            }

/// <summary>
            /// 获得页面的权限，1 具有权限，0 用户超时，-1 没有权限
            /// </summary>
            /// <param name="control"></param>
            /// <param name="Field"></param>
            public PowerAttribute(ref int Field)
            {
                Field = HasPower(WebHelper.WebRequest.Path);
            }
        }

属性参数必须是常量表达式、typeof 表达式或数组创建表达式 ConsoleTest

        static void Main(string[] args)
        {
            AttributeCollection attributes = TypeDescriptor.GetProperties(new MyClass())["MyProperty"].Attributes;

/* Prints the default value by retrieving the DefaultValueAttribute 
             * from the AttributeCollection. */
            DefaultValueAttribute myAttribute =
               (DefaultValueAttribute)attributes[typeof(DefaultValueAttribute)];
            Console.WriteLine("The default value is: " + myAttribute.Value.ToString());

Console.Read();
        }

class MyClass
        {
            private bool myVal = false;

[DefaultValue(false)]
            public bool MyProperty
            {
                get
                {
                    return myVal;
                }
                set
                {
                    myVal = value;
                }
            }

}