上篇随笔主要是针对于Xml的特性Attribute与实体之间的匹配与转换。该篇随笔主要内容为将对象转换成相应的Xml以及XElement。这2篇随笔以不同的方式对Xml进行转换与匹配，每种匹配都采用不同的角度进行操作。本文主要为对象实体的转换，下篇侧重于Xml的匹配。
二、Xml转换
2.1 实体集合转换Xml
实体集合转换Xml的方法为：public static string ToXml<T>(IList<T> entities, string rootName = "") where T : new()，通过传入的实体集合对象和Xml根名称，可以转换成相应的Xml，代码如下：
1 public static string ToXml<T>(IList<T> entities, string rootName = "") where T : new() 2 { 3 if (entities == null || entities.Count == 0) 4 { 5 return string.Empty; 6 } 7 8 StringBuilder builder = new StringBuilder(); 9 builder.AppendLine(XmlResource.XmlHeader); 10 11 XElement element = ToXElement<T>(entities, rootName); 12 builder.Append(element.ToString()); 13 14 return builder.ToString(); 15 }
针对于实体集合的转换，转换后的结果如下：
1 <?xml version= " 1.0" encoding="utf-8" ?> 2 <MapperInfoSet> 3 <MapperInfo> 4 <Name>MapperInfoIndex0</Name> 5 <CreatedTime> 2012- 02-19T08: 54: 44.9411601+ 08: 00</CreatedTime> 6 <IsActive> true</IsActive> 7 <Value> 0</Value> 8 <Percent> 50</Percent> 9 <TargetUrl>www.codeplex.com?Id= 0</TargetUrl> 10 </MapperInfo> 11 <MapperInfo> 12 <Name>MapperInfoIndex1</Name> 13 <CreatedTime> 2012- 02-19T08: 54: 44.9421602+ 08: 00</CreatedTime> 14 <IsActive> false</IsActive> 15 <Value> 1</Value> 16 <Percent> 50</Percent> 17 <TargetUrl>www.codeplex.com?Id= 1</TargetUrl> 18 </MapperInfo> 19 </MapperInfoSet>
2.2 实体转换Xml
实体转换Xml的方法为：public static string ToXml<T>(T entity) where T : new()，通过传入的实体，可以转换成相应的Xml，代码如下：
1 public static string ToXml<T>(T entity) where T : new() 2 { 3 if (entity == null) 4 { 5 return string.Empty; 6 } 7 8 XElement element = ToXElement<T>(entity); 9 10 return element.ToString(); 11 }
针对于单个实体的转换，转换后的结果如下：
1 <MapperInfo> 2 <Name>MapperInfoIndex0</Name> 3 <CreatedTime> 2012- 02-19T08: 59: 17.1387289+ 08: 00</CreatedTime> 4 <IsActive> true</IsActive> 5 <Value> 0</Value> 6 <Percent> 50</Percent> 7 <TargetUrl>www.codeplex.com?Id= 0</TargetUrl> 8 </MapperInfo>
2.3 实体集合转换XElement
实体转换XElement的方法为：public static XElement ToXElement<T>(IList<T> entities, string rootName = "") where T : new()，通过传入的实体集合对象和Xml根名称，可以转换成相应的XElement，代码如下：
1 public static XElement ToXElement<T>(IList<T> entities, string rootName = "") where T : new() 2 { 3 if (entities == null || entities.Count == 0) 4 { 5 return null; 6 } 7 8 if ( string.IsNullOrWhiteSpace(rootName)) 9 { 10 rootName = typeof(T).Name + XmlResource.XmlRootNameSuffix; 11 } 12 13 XElement element = new XElement(rootName); 14 15 foreach (T entity in entities) 16 { 17 element.Add(ToXElement<T>(entity)); 18 } 19 20 return element; 21 }
2.4 实体集合转换XmlDocument
实体转换XmlDocument的方法为：public static XElement ToXmlDocument<T>(IList<T> entities, string rootName = "") where T : new()，通过传入的实体集合对象和Xml根名称，可以转换成相应的XmlDocument，代码如下：
1 public static XmlDocument ToXmlDocument<T>(IList<T> entities, string rootName = "") where T : new() 2 { 3 if (entities == null || entities.Count == 0) 4 { 5 return null; 6 } 7 8 XmlDocument xmlDocument = new XmlDocument(); 9 xmlDocument.LoadXml(ToXml<T>(entities, rootName)); 10 11 return xmlDocument; 12 }
2.5 实体转换XElement
实体转换XElement的方法为：public static string ToXElement<T>(T entity) where T : new()，通过传入的实体，可以转换成相应的XElement，代码如下：
1 public static XElement ToXElement<T>(T entity) where T : new() 2 { 3 if (entity == null) 4 { 5 return null; 6 } 7 8 XElement element = new XElement( typeof(T).Name); 9 PropertyInfo[] properties = typeof(T).GetProperties(); 10 XElement innerElement = null; 11 object propertyValue = null; 12 13 foreach (PropertyInfo property in properties) 14 { 15 propertyValue = property.GetValue(entity, null); 16 innerElement = new XElement(property.Name, propertyValue); 17 element.Add(innerElement); 18 } 19 20 return element; 21 }
2.6 实体集合转换XDocument
实体转换XDocument的方法为：public static XDocument ToXDocument<T>(IList<T> entities, string rootName = "") where T : new()，通过传入的实体集合对象和Xml根名称，可以转换成相应的XDocument，代码如下：
1 public static XDocument ToXDocument<T>(IList<T> entities, string rootName = "") where T : new() 2 { 3 if (entities == null || entities.Count == 0) 4 { 5 return null; 6 } 7 8 return XDocument.Parse(ToXml<T>(entities, rootName)); 9 }
三、总结
以上的代码很少，主要通过重构来使代码简化。当然，将实体集合和实体转换为相应的string、XDocument、XElement、XDocument是非常简单的。单元测试的代码就不贴了，占地方。下篇随笔主要是如何将本文中转换的Xml进行匹配，本文所有的代码如下：
View Code public class SimpleXmlConverter { public static string ToXml<T>(IList<T> entities, string rootName = "") where T : new() { if (entities == null || entities.Count == 0) { return string.Empty; } StringBuilder builder = new StringBuilder(); builder.AppendLine(XmlResource.XmlHeader); XElement element = ToXElement<T>(entities, rootName); builder.Append(element.ToString()); return builder.ToString(); } public static XmlDocument ToXmlDocument<T>(IList<T> entities, string rootName = "") where T : new() { if (entities == null || entities.Count == 0) { return null; } XmlDocument xmlDocument = new XmlDocument(); xmlDocument.LoadXml(ToXml<T>(entities, rootName)); return xmlDocument; } public static XDocument ToXDocument<T>(IList<T> entities, string rootName = "") where T : new() { if (entities == null || entities.Count == 0) { return null; } return XDocument.Parse(ToXml<T>(entities, rootName)); } public static XElement ToXElement<T>(IList<T> entities, string rootName = "") where T : new() { if (entities == null || entities.Count == 0) { return null; } if ( string.IsNullOrWhiteSpace(rootName)) { rootName = typeof(T).Name + XmlResource.XmlRootNameSuffix; } XElement element = new XElement(rootName); foreach (T entity in entities) { element.Add(ToXElement<T>(entity)); } return element; } public static string ToXml<T>(T entity) where T : new() { if (entity == null) { return string.Empty; } XElement element = ToXElement<T>(entity); return element.ToString(); } public static XElement ToXElement<T>(T entity) where T : new() { if (entity == null) { return null; } XElement element = new XElement( typeof(T).Name); PropertyInfo[] properties = typeof(T).GetProperties(); XElement innerElement = null; object propertyValue = null; foreach (PropertyInfo property in properties) { propertyValue = property.GetValue(entity, null); innerElement = new XElement(property.Name, propertyValue); element.Add(innerElement); } return element; } public static XElement ToXElement(Type type) { if (type == null) { return null; } XElement element = new XElement(type.Name); PropertyInfo[] properties = type.GetProperties(); XElement innerElement = null; foreach (PropertyInfo property in properties) { innerElement = new XElement(property.Name, null); element.Add(innerElement); } return element; } }