.Net版的BeanUtils
自己实现了Java的BeanUtils的部分功能，因为最近工作中用到了这个功能，以为.Net中也有类似Java的beanutils中的，网上找了半天没有找到相关的资源，记得以前实现过，可是使用中怕遇到了一些未知的问题，无耐之下自己动手实现了这个功能，下面是我实现，如有问题请指出：
/** *@Author:wsx *@Date:2013-11-18 *@Des:.Net实现Java的beanutils类 */ using System; using System.Collections.Generic; using System.Text; using System.Collections; using System.Reflection; using System.Collections.Specialized; using System.Data; using System.Xml; namespace Com.Miteno.BeanUtils { public class BeanUtils { /// <summary> /// 将IDictionary赋值给bean对象 /// </summary> /// <param name="bean"></param> /// <param name="properties"></param> public static void Populate(object bean, IDictionary properties) { IDictionaryEnumerator ide = properties.GetEnumerator(); while (ide.MoveNext()) { SetProperty(bean, ide.Key.ToString(), ide.Value); } } /// <summary> /// 将IDictionary赋值给bean对象 /// </summary> /// <param name="bean"></param> /// <param name="properties"></param> public static void Populate(object bean, IDictionary<string, object> properties) { foreach (string prop in properties.Keys) { SetProperty(bean, prop, properties[prop]); } } /// <summary> /// 将NameValueCollection赋值给bean对象 /// </summary> /// <param name="bean"></param> /// <param name="properties"></param> public static void Populate(object bean, NameValueCollection properties) { string[] keys = properties.AllKeys; foreach (string key in keys) { SetProperty(bean, key, properties[key]); } } /// <summary> /// dr赋值给实例 /// </summary> /// <param name="bean"></param> /// <param name="dr"></param> public static void Populate(object bean, DataRow dr) { IDictionary<string, object> dic = GetDictionary(dr); Populate(bean, dic); } /// <summary> /// dt得到实例 /// </summary> /// <param name="bean"></param> /// <param name="dt"></param> /// <returns></returns> public static List<T> Populate<T>(T bean, DataTable dt) { List<T> l = new List<T>(); List<IDictionary<string, object>> list = GetDictionary(dt); foreach (IDictionary dic in list) { T cloneBean = Activator.CreateInstance<T>(); Populate(cloneBean, dic); l.Add(cloneBean); } return l; } /// <summary> /// dt得到实例 /// </summary> /// <param name="bean"></param> /// <param name="dt"></param> /// <returns></returns> public static List<T> Populate<T>(T bean, XmlDocument dom, string beanTagName, DomPropertyType propType) { List<T> l = new List<T>(); List<IDictionary<string, object>> list = GetDictionary(dom, beanTagName, propType); foreach (IDictionary dic in list) { T cloneBean = Activator.CreateInstance<T>(); Populate(cloneBean, dic); l.Add(cloneBean); } return l; } /// <summary> /// 赋值bean /// </summary> /// <typeparam name="T"></typeparam> /// <param name="bean"></param> /// <returns></returns> public static T CloneBean<T>(T bean) { T o = Activator.CreateInstance<T>(); CopyProperties(o, bean); return o; } public static void CopyProperties(object dest, object orig) { IDictionary cache = Describe(orig); Populate(dest, cache); } public static void CopyProperty(object bean, string name, object value) { SetProperty(bean, name, value); } public static IDictionary Describe(object bean) { Hashtable cache = new Hashtable(); Type beantype = bean.GetType(); PropertyInfo[] properties = beantype.GetProperties(); foreach (PropertyInfo pi in properties) { string pname = pi.Name; object obj = pi.GetValue(bean, null); cache.Add(pname, obj); } return cache; } /// <summary> /// 获取对象的属性 /// </summary> /// <param name="bean"></param> /// <param name="props"></param> /// <returns></returns> public static IDictionary<string, object> GetDictionaryProperties(object bean, string[] props) { IDictionary<string, object> dic = new Dictionary<string, object>(); foreach (string prop in props) { object obj = GetProperty(bean, prop); dic.Add(prop, obj); } return dic; } /// <summary> /// 获取对象的所有属性 /// </summary> /// <param name="bean"></param> /// <returns></returns> public static IDictionary<string, object> GetAllProperties(object bean) { IDictionary<string, object> dic = new Dictionary<string, object>(); Type type = bean.GetType(); PropertyInfo[] pinfos = type.GetProperties(); foreach (PropertyInfo pi in pinfos) { dic.Add(pi.Name, pi.GetValue(bean, null)); } return dic; } /// <summary> /// 获取对象指定的属性值 /// </summary> /// <param name="bean">对象</param> /// <param name="name">属性名称</param> /// <returns></returns> public static object GetProperty(object bean, string name) { Type beantype = bean.GetType(); PropertyInfo pi = beantype.GetProperty(name); return pi.GetValue(bean, null); } public static void SetProperty(object bean, string name, object value) { Type beantype = bean.GetType(); PropertyInfo pi = beantype.GetProperty(name); object destValue = GetDestValue(pi, value); pi.SetValue(bean, destValue, null); } /// <summary> /// 获取值类型的默认值 /// </summary> /// <returns></returns> private static object GetValueTypeDefaultValue(Type type) { object defValue; switch (type.FullName) { case "System.Boolean": defValue = false; break; case "System.Byte": case "System.SByte": defValue = Byte.MinValue; break; case "System.Int16": case "System.UInt16": case "System.Int32": case "System.UInt32": case "System.Int64": case "System.UInt64": case "System.Double": case "System.Single": defValue = Convert.ChangeType(0, type); break; case "System.Char": defValue = '0'; break; case "System.DateTime": defValue = DateTime.MinValue; break; case "System.Decimal": defValue = Convert.ChangeType(0, type); break; default: defValue = 0; break; } return defValue; } /// <summary> /// 获取类型的最终值 /// </summary> /// <param name="pi"></param> /// <param name="value"></param> /// <returns></returns> private static object GetDestValue(PropertyInfo pi, object value) { Type propType = pi.PropertyType; if (propType.IsGenericType) { //泛型类型（包括可空类型） Type type = Nullable.GetUnderlyingType(propType); if (type != null) { if (value == DBNull.Value) { value = null; } #region 作废该数据 //if (type.IsValueType) //{ // //值类型 // if (value == DBNull.Value || value == null) // { // value = GetValueTypeDefaultValue(type); // } //} //else //{ // //引用类型 // if (value == DBNull.Value) // { // value = null; // } //} #endregion } } else { if (propType.IsValueType) { //值类型 if (value == DBNull.Value || value == null) { value = GetValueTypeDefaultValue(propType); } } else { //引用类型 if (value == DBNull.Value) { value = null; } } } return value; } /// <summary> /// 将DataRow转换成Hashtable /// </summary> /// <param name="row"></param> /// <returns></returns> public static IDictionary<string, object> GetDictionary(DataRow row) { IDictionary<string, object> dic = new Dictionary<string, object>(); if (row != null) { foreach (DataColumn c in row.Table.Columns) { dic.Add(c.ColumnName, row[c]); } } return dic; } public static List<IDictionary<string, object>> GetDictionary(XmlDocument dom, string beanTagName, DomPropertyType propType) { List<IDictionary<string, object>> list = new List<IDictionary<string, object>>(); switch (propType) { case DomPropertyType.ElementType: XmlNodeList nodes = dom.SelectNodes(string.Format(@"//" + beanTagName)); foreach (XmlNode xn in nodes) { IDictionary<string, object> dic = new Dictionary<string, object>(); XmlNodeList children = xn.ChildNodes; foreach (XmlNode xnn in children) { dic.Add(xn.Name, xn.InnerText); } list.Add(dic); } break; case DomPropertyType.AttributeType: XmlNodeList ns = dom.SelectNodes(string.Format(@"//" + beanTagName)); foreach (XmlNode xn in ns) { IDictionary<string, object> dic = new Dictionary<string, object>(); XmlAttributeCollection attrs = xn.Attributes; foreach (XmlAttribute attr in attrs) { dic.Add(attr.Name, attr.Value); } list.Add(dic); } break; default: break; } return list; } /// <summary> /// 将DataTable转换成List<Hashtable> /// </summary> /// <param name="dt"></param> /// <returns></returns> public static List<IDictionary<string, object>> GetDictionary(DataTable dt) { List<IDictionary<string, object>> list = new List<IDictionary<string, object>>(); if (dt != null) { foreach (DataRow dr in dt.Rows) { list.Add(GetDictionary(dr)); } } return list; } /// <summary> /// 将DataSet转成List /// </summary> /// <param name="ds"></param> /// <returns></returns> public static List<List<IDictionary<string, object>>> GetDictionary(DataSet ds) { List<List<IDictionary<string, object>>> list = new List<List<IDictionary<string, object>>>(); if (ds != null && ds.Tables.Count > 0) { list.Add(GetDictionary(ds.Tables[0])); } return list; } } /// <summary> /// 对象的值，是以节点的形式，还是以属性的形式 /// </summary> public enum DomPropertyType { ElementType = 0, AttributeType = 1 } }
