.net中可以使用Type.GetCustomAttributes獲取類上的自定義屬性，可以使用PRopertyInfo.GetCustomAttributes獲取屬性信息上的自定義屬性。

下面以定義一個簡單數(shù)據(jù)庫表的映射實體類來說明相關(guān)的使用方法,基于自定義類屬性和自定義類中的屬性的自定義屬性，可以方便的進行類標(biāo)記和類中屬性的標(biāo)記

創(chuàng)建一個類的自定義屬性，用于標(biāo)識數(shù)據(jù)庫中的表名稱，需要繼承自Attribute類：

[AttributeUsage(AttributeTargets.Class, Inherited = false, AllowMultiple = false)] public sealed class TableAttribute : Attribute { private readonly string _TableName = ""; public TableAttribute(string tableName) { this._TableName = tableName; } public string TableName { get { return this._TableName; } } }

創(chuàng)建一個屬性的自定義屬性,用于標(biāo)識數(shù)據(jù)庫表中字段的名稱，需要繼承自Attribute類

[AttributeUsage(AttributeTargets.Property, Inherited = false, AllowMultiple = false)] public class FieldAttribute : Attribute { private readonly string _FieldName = ""; ///數(shù)據(jù)庫的字段名稱

private System.Data.DbType _Type = System.Data.DbType.String; ///數(shù)據(jù)庫的字段類型

public FieldAttribute(string fieldName)

{

this._FieldName=fieldName;

}

public FieldAttribute(string fieldName,System.Data.DbType type)

{

this._FieldName=fieldName;

this._Type=type;

}

public string FieldName { get { return this._FieldName; } }

public System.Data.DbType Type

{

get{return this._Type;}

}

}

創(chuàng)建一個數(shù)據(jù)實體基類：

public class BaseEntity{ public BaseEntity() { }

/// <summary> /// 獲取表名稱 /// </summary> /// <returns></returns> public string GetTableName() { Type type = this.GetType(); object[] objs = type.GetCustomAttributes(typeof(TableAttribute), true); if (objs.Length <= 0) { throw new Exception("實體類沒有標(biāo)識TableAttribute屬性"); } else { object obj = objs[0]; TableAttribute ta = (TableAttribute)obj; return ta.TableName; //獲取表名稱 } } /// <summary> /// 獲取數(shù)據(jù)實體類上的FieldAttribute /// </summary> /// <param name="propertyName"></param> /// <returns></returns> public FieldAttribute GetFieldAttribute(string propertyName) { PropertyInfo field = this.GetType().GetProperty(propertyName); if (field == null) { throw new Exception("屬性名" + propertyName + "不存在"); } object[] objs = field.GetCustomAttributes(typeof(FieldAttribute), true); if (objs.Length <= 0) { throw new Exception("類體屬性名" + propertyName + "沒有標(biāo)識FieldAttribute屬性"); } else { object obj = objs[0]; FieldAttribute fieldAttribute=(FieldAttribute)obj; fieldAttribute.FieldValue=field.GetValue(this,null); return fieldAttribute; } }

}

創(chuàng)建數(shù)據(jù)實體

[Table("Wincms_Dictionary")] ///映射到數(shù)據(jù)庫的Wincms_Dictionary表public class Wincms_Dictionary : BaseEntity{

private int _DictionaryId;

public Wincms_Dictionary()

{

}

[Field("DictionaryId",DbType.Int32)] ///映射到數(shù)據(jù)庫的Wincms_Dictionary表中的字段 public int DictionaryId { get { return this._DictionaryId; } set { this._DictionaryId = value; } }

}

///基于實體類獲取實體對應(yīng)的表名稱和字段名稱

public class Test

{

public static void main(string[] args)

{

Wincms_Dictionary dict=new Wincms_Dictionary();

Console.WriteLine("表名稱："+GetTableName(dict));

Console.WriteLine("字段名稱:"+GetFieldName(dict,"DictionaryId"));

Console.Read();

}

///獲取實體表名稱

public static string GetTableName(BaseEntity entity)

{

return entity.GetTableName();

}

///獲取實體字段名稱

public static string GetFieldName(BaseEntity entity,string propertyName)

{

FieldAttribute fieldAttribute=entity.GetFieldAttribute(propertyName);

return fieldAttribute.FieldName;

}

}

輸出結(jié)果為：

表名稱：Wincms_Dictionary

字段名稱：DictionaryId