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最近自己写了个ORM框架，里面用到的 属性和字段的特性装饰

定义Attribute装饰类、实体类、字段结构体：

    [AttributeUsage(AttributeTargets.Property)] //此属性只能用在Property上 public class CyAttribute : Attribute{private string _datatype = string.Empty;private int _length = 0;public CyAttribute(string datatype, int length){_datatype = datatype;_length = length;}public string DataType{get { return _datatype; }set { _datatype = value; }}public int Length{get { return _length; }set { _length = value; }}}[AttributeUsage(AttributeTargets.Field)] //此属性只能用在Field上 public class CyAttributeField : Attribute{private string _datatype = string.Empty;private int _length = 0;public CyAttributeField(string datatype, int length){_datatype = datatype;_length = length;}public string DataType{get { return _datatype; }set { _datatype = value; }}public int Length{get { return _length; }set { _length = value; }}} [AttributeUsage(AttributeTargets.Field)] //此属性只能用在Field上 public class CyAttribute2 : Attribute{private string _op = string.Empty;public CyAttribute2(string op){_op = op;}public string Name{get { return _op; }set { _op = value; }}}/// <summary>/// 用户表实体类/// </summary>public class Users{[CyAttribute("System.String", 50)]public string Uname { get; set; }[CyAttribute("System.String", 20)]public string Pswd { get; set; }[CyAttribute("System.Int32", 4)]public int Age { get; set; }}/// <summary>///常量字段/// </summary>public struct Plat{[CyAttributeField("System.String", 89)]public const string FirstName = "FirstName";[CyAttributeField("System.Int32", 6), CyAttribute2("hahaha")]public const string Age = "Age";}

调用属性、字段 Attribute的方法：

public void Test(){Type typetField = typeof(Plat);System.Reflection.FieldInfo finfo = typetField.GetField("Age");Attribute at1 = finfo.GetCustomAttributes(true)[0] as Attribute;foreach (Attribute at in finfo.GetCustomAttributes(true)){CyAttributeField att = at as CyAttributeField;if (att != null){string dataType = att.DataType;//字段数据类型int dataLen = att.Length;//字段数据长度
                }}foreach (System.Reflection.FieldInfo fieldInfo in typetField.GetFields()){foreach (Attribute at in fieldInfo.GetCustomAttributes(true)){CyAttributeField att = at as CyAttributeField;if (att != null){string dataType = att.DataType;//字段数据类型int dataLen = att.Length;//字段数据长度continue;} CyAttribute2 att2 = at as CyAttribute2;if (att2 != null){string name2 = att2.Name; ;//字段描述 continue;}}}Users user = new Users();user.Uname = "曹永思";user.Pswd = "123456";user.Age = 24;List<string> userInfo = new List<string>();Type typeProperty = typeof(Users);foreach (System.Reflection.PropertyInfo propertyInfo in typeProperty.GetProperties()){foreach (Attribute at in propertyInfo.GetCustomAttributes(true)){CyAttribute att = at as CyAttribute;if (att != null){userInfo.Add(propertyInfo.Name + "+" + att.DataType + "+" + att.Length + "+" + att.TypeId);}}}}

 //code by:博客园-曹永思

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