using System;
using System.Collections;
using System.Collections.Generic;
using System.Xml;
using NewLife.Exceptions;
using NewLife.Log;
namespace NewLife.Xml
{
/// <summary>使用Xml来存储字典扩展数据,不怕序列化和混淆</summary>
public class ExtendData
{
#region 属性
private Dictionary<String, String> _Data;
/// <summary>数据</summary>
public Dictionary<String, String> Data { get { return _Data ?? (_Data = new Dictionary<String, String>()); } set { _Data = value; } }
private List<String> _XmlKeys;
/// <summary>Xml数据键值</summary>
public List<String> XmlKeys { get { return _XmlKeys; } set { _XmlKeys = value; } }
private String _Root;
/// <summary>根名称</summary>
public String Root { get { return _Root; } set { _Root = value; } }
#endregion
#region 集合管理
/// <summary>读取设置数据</summary>
/// <param name="key"></param>
/// <returns></returns>
public String this[String key]
{
get
{
String str = null;
return Data.TryGetValue(key, out str) ? str : null;
}
set { Data[key] = value; }
}
/// <summary>取得指定键的强类型值</summary>
/// <typeparam name="T"></typeparam>
/// <param name="key"></param>
/// <returns></returns>
public T GetItem<T>(String key)
{
if (!Contain(key)) return default(T);
String value = this[key];
if (String.IsNullOrEmpty(value)) return default(T);
Type t = typeof(T);
if (t.IsValueType || Type.GetTypeCode(t) == TypeCode.String || t == typeof(Object))
{
return (T)Convert.ChangeType(value, t);
}
else if (t.IsArray || value is IEnumerable)
{
ExtendData data = FromXml(value);
if (data == null) throw new XException("ExtendData无法分析数据" + value);
List<String> list = new List<String>();
for (Int32 i = 1; i < Int32.MaxValue; i++)
{
if (!data.Contain("Item" + i.ToString())) break;
list.Add(data["Item" + i.ToString()]);
}
return (T)Convert.ChangeType(list.ToArray(), t);
}
throw new XException("不支持的类型{0},键{1}", typeof(T), key);
}
/// <summary>设置类型</summary>
/// <param name="key"></param>
/// <param name="value"></param>
public void SetItem(String key, Object value)
{
if (value == null)
{
this[key] = String.Empty;
return;
}
Type t = value.GetType();
if (t.IsValueType || Type.GetTypeCode(t) == TypeCode.String || t == typeof(Object))
{
this[key] = value.ToString();
return;
}
else if (value is IEnumerable)
{
ExtendData data = new ExtendData();
data.Root = key;
IEnumerable list = value as IEnumerable;
Int32 i = 1;
foreach (Object item in list)
{
data["Item" + i++.ToString()] = item.ToString();
}
this[key] = data.ToXml();
if (XmlKeys == null) XmlKeys = new List<String>();
if (!XmlKeys.Contains(key)) XmlKeys.Add(key);
return;
}
throw new XException(String.Format("不支持的类型{0},键{1},数据{2}", t, key, value));
}
/// <summary>包含指定键</summary>
/// <param name="key"></param>
/// <returns></returns>
public Boolean Contain(String key) { return Data.ContainsKey(key); }
/// <summary>移除指定项</summary>
/// <param name="key"></param>
public void Remove(String key) { if (Data.ContainsKey(key)) Data.Remove(key); }
/// <summary>是否为空</summary>
public Boolean IsEmpty { get { return Data.Count < 1; } }
#endregion
#region 方法
/// <summary>从Xml转为具体数据</summary>
/// <param name="xml"></param>
/// <returns></returns>
public static ExtendData FromXml(String xml)
{
if (String.IsNullOrEmpty(xml)) return null;
XmlDocument doc = new XmlDocument();
try
{
doc.LoadXml(xml);
}
catch (XmlException ex)
{
XTrace.WriteLine("Xml数据异常!" + ex.Message + Environment.NewLine + xml);
throw;
}
ExtendData extend = new ExtendData();
XmlElement root = doc.DocumentElement;
extend.Root = root.Name;
if (root.ChildNodes != null && root.ChildNodes.Count > 0)
{
foreach (XmlNode item in root.ChildNodes)
{
if (item.ChildNodes != null && (item.ChildNodes.Count > 1 ||
item.ChildNodes.Count == 1 && !(item.FirstChild is XmlText)))
{
extend[item.Name] = item.InnerXml;
}
else
{
extend[item.Name] = item.InnerText;
}
}
}
return extend;
}
/// <summary>转为Xml</summary>
/// <returns></returns>
public String ToXml()
{
XmlDocument doc = new XmlDocument();
String rootName = Root;
if (String.IsNullOrEmpty(rootName)) rootName = "Extend";
XmlElement root = doc.CreateElement(rootName);
doc.AppendChild(root);
if (Data != null && Data.Count > 0)
{
foreach (String item in Data.Keys)
{
XmlElement elm = doc.CreateElement(item);
if (XmlKeys != null && XmlKeys.Contains(item))
elm.InnerXml = Data[item];
else
elm.InnerText = Data[item];
root.AppendChild(elm);
}
}
return doc.OuterXml;
}
#endregion
}
}
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