public static T FindByPrimaryKey <T>(string PrimaryKey) where T : XmlEntity
{
if (string.IsNullOrEmpty(PrimaryKey))
{
return(null);
}
List <T> tList = FindAll <T>();
if (tList == null || tList.Count == 0)
{
return(null);
}
XmlEntityInfo xmlEntityInfo = GetXmlEntityInfo <T>();
foreach (var item in tList)
{
object ItemPrimaykey = xmlEntityInfo.PrimayKey.GetValue(item, null);
if (ItemPrimaykey.ToString() == PrimaryKey)
{
return(item);
}
}
return(null);
}
internal static XmlEntityInfo GetXmlEntityInfo <T>() where T : XmlEntity
{
Type type = typeof(T);
if (XmlEntityInfoCache.ContainsKey(type.FullName))
{
return(XmlEntityInfoCache[type.FullName]);
}
XmlEntityInfo xmlEntityInfo = new XmlEntityInfo();
//获取当前类的名称,用作持久化Xml文件的名称
xmlEntityInfo.XmlFileName = type.Name;
//尝试从config中读取XML文件存放路径，如果没有读取到，则默认存放在Config/{XmlFileName}路径下
string XmlDb = ConfigurationManager.AppSettings["XmlDb"];
if (string.IsNullOrEmpty(XmlDb))
{
XmlDb = "XmlDb";
}
//判断配置文件的路径是否存在，不存在则创建相关的文件路径
if (!Directory.Exists(System.Environment.CurrentDirectory + "/" + XmlDb))
{
Directory.CreateDirectory(System.Environment.CurrentDirectory + "/" + XmlDb);
}
//初始化文件存放的最终绝对路径
xmlEntityInfo.XmlSavePath = System.Environment.CurrentDirectory + "/" + XmlDb + "/" + xmlEntityInfo.XmlFileName + ".xml";
xmlEntityInfo.Properties = type.GetProperties()?.ToList();
foreach (PropertyInfo item in xmlEntityInfo.Properties)
{
object[] attributes = item.GetCustomAttributes(false);
if (attributes?.Length > 0)
{
foreach (var attr in attributes)
{
if (attr is PrimaryKeyAttribute)
{
xmlEntityInfo.PrimayKey = item;
break;
}
}
}
if (xmlEntityInfo.PrimayKey != null)
{
break;
}
}
XmlEntityInfoCache[type.FullName] = xmlEntityInfo;
return(xmlEntityInfo);
}
/// <summary>
/// 保存数据集合
/// </summary>
/// <typeparam name="T"></typeparam>
/// <returns></returns>
public static bool SaveList <T>(List <T> tList) where T : XmlEntity
{
XmlEntityInfo xmlEntityInfo = GetXmlEntityInfo <T>();
#region 通过 XmlTextWriter将配置持久化到文件中
XmlTextWriter myXmlTextWriter = new XmlTextWriter(xmlEntityInfo.XmlSavePath, null);
//使用 Formatting 属性指定希望将 XML 设定为何种格式。 这样，子元素就可以通过使用 Indentation 和 IndentChar 属性来缩进。
myXmlTextWriter.Formatting = Formatting.Indented;
myXmlTextWriter.WriteStartDocument(true);
myXmlTextWriter.WriteStartElement("XmlDatas");
myXmlTextWriter.WriteAttributeString("xmlns:xsi", "http://www.w3.org/2001/XMLSchema-instance");
myXmlTextWriter.WriteAttributeString("xmlns:xsd", "http://www.w3.org/2001/XMLSchema");
myXmlTextWriter.WriteStartElement(xmlEntityInfo.XmlFileName + "s");
tList.ForEach(m =>
{
myXmlTextWriter.WriteStartElement(xmlEntityInfo.XmlFileName);
//循环所有属性
foreach (PropertyInfo item in xmlEntityInfo.Properties)
{
object value = item.GetValue(m, null);
myXmlTextWriter.WriteElementString(item.Name, value?.ToString());
}
myXmlTextWriter.WriteEndElement();
});
myXmlTextWriter.Flush();
myXmlTextWriter.Close();
myXmlTextWriter = null;
GC.Collect();
return(true);
#endregion
}
/// <summary>
/// 构造函数
/// </summary>
public XmlEntity()
{
Type type = this.GetType();
_EntityInfo = XmlHelper.GetXmlEntityInfo(type);
}
public static List <T> FindAll <T>() where T : XmlEntity
{
XmlEntityInfo xmlEntityInfo = GetXmlEntityInfo <T>();
List <T> result = new List <T>();
if (!File.Exists(xmlEntityInfo.XmlSavePath))
{
return(null);
}
//先解密这个文件
//Base64Helper.Base64Decode4txtFile(XmlSavePath);
XmlTextReader reader = new XmlTextReader(xmlEntityInfo.XmlSavePath);
T obj = null;
while (reader.Read())
{
if (reader.NodeType == XmlNodeType.Element)
{
if (reader.Name == xmlEntityInfo.XmlFileName)
{
obj = System.Activator.CreateInstance <T>();
result.Add(obj);
}
else
{
//读取到属性
string propertyName = reader.Name;
var ProertyInfo = xmlEntityInfo.Properties.Find(m => m.Name == propertyName);
if (obj != null && ProertyInfo != null)
{
string propertyValue = reader.ReadElementContentAsString();
if (ProertyInfo.PropertyType == typeof(Int32))
{
if (Int32.TryParse(propertyValue, out int intValue))
{
ProertyInfo.SetValue(obj, intValue, null);
}
}
else if (ProertyInfo.PropertyType == typeof(bool))
{
if (bool.TryParse(propertyValue, out bool bValue))
{
ProertyInfo.SetValue(obj, bValue, null);
}
}
else
{
ProertyInfo.SetValue(obj, propertyValue, null);
}
}
}
}
}
//关闭流
reader.Close();
reader = null;
GC.Collect();
return(result);
}
