public void Dispose()
{
if (this.propertyValues != null)
{
this.propertyValues.Clear();
}
this.propertyValues = null;
foreach (var childrenType in childrenTypes)
{
var exPropertyInfoList = ExtendPropertysProvider.GetByType(childrenType.Value);
foreach (var extendProperty in exPropertyInfoList)
{
extendProperty.ValueChanged -= new EventHandler <ExtendPropertyValueChangedArgs>(exObject_ChildrenPropertyChanged);
}
}
if (objects != null)
{
foreach (var o in objects)
{
var obj = o as ExtendObject;
obj.ChildrenPropertyChanged -= new EventHandler <ExtendPropertyValueChangedArgs>(exObject_ChildrenPropertyChanged);
}
}
}
public static ExtendProperty[] GetPropertys(Type ownerType)
{
return(ExtendPropertysProvider.GetByType(ownerType));
//return ownerType.GetFields
// (BindingFlags.Static | BindingFlags.Public)
// .Where(f => f.FieldType == typeof(ExtendProperty))
// .Select(f => (ExtendProperty)f.GetValue(null)).ToArray();
}
/// <summary>
/// 对象初始化函数，对象被创建时，这个函数将被调用
/// </summary>
/// <param name="item">扩展对象</param>
/// <param name="args">参数</param>
public virtual void OnDoCreate(ExtendObject item, params object[] args)
{
OwnerType = this.GetType();
var plist = ExtendPropertysProvider.GetByType(OwnerType).ToList();
if (plist.Count <= 0)
{
plist = ExtendPropertysProvider.GetByType(OwnerType.BaseType).ToList();
}
var types = plist.Where(p => childrenTypes.Values.Any(cp => cp == p.PropertyType)).ToDictionary(m => m.PropertyName, e => e.PropertyType);
foreach (var children in types)
{
var info = OwnerType.GetProperty(children.Key);
if (info != null)
{
var childObj = info.GetValue(this, null) as ExtendObject;
if (childObj != null)
{
objects.Add(childObj);
childObj.ChildrenPropertyChanged -=
new EventHandler <ExtendPropertyValueChangedArgs>(exObject_ChildrenPropertyChanged);
childObj.ChildrenPropertyChanged +=
new EventHandler <ExtendPropertyValueChangedArgs>(exObject_ChildrenPropertyChanged);
}
}
var childObjPropertyInfoList = ExtendPropertysProvider.GetByType(children.Value);
foreach (var extendProperty in childObjPropertyInfoList)
{
extendProperty.ValueChanged -=
new EventHandler <ExtendPropertyValueChangedArgs>(exObject_ChildrenPropertyChanged);
extendProperty.ValueChanged +=
new EventHandler <ExtendPropertyValueChangedArgs>(exObject_ChildrenPropertyChanged);
}
}
}
protected virtual void Restore()
{
// 如果没有备份数据，则忽略此调用。
if (____backup != null && ____backup.Count > 0)
{
//反序列化得到字典。
HybridDictionary state;
using (MemoryStream buffer = new MemoryStream(____backup.Pop()))
{
buffer.Position = 0;
BinaryFormatter formatter = new BinaryFormatter();
try
{
state = (HybridDictionary)formatter.Deserialize(buffer);
}
catch
{
return;
}
}
object source = this;
Type sourceType = source.GetType();
ExtendProperty[] propertys;
// 获取所有字段信息。
propertys = ExtendPropertysProvider.GetByType(this.GetType());
foreach (ExtendProperty property in propertys)
{
//获取新值。
object value = this.GetValue(property);
if (typeof(IBusinessObject).IsAssignableFrom(property.PropertyType))
{
//这是个子对象，检查只是否为空。
if (state.Contains(property.GetHashCode()))
{
//原来为空，设置为空。
this.SetValue(property, null);
}
else
{
if (value != null)
{
// 子对象调用Restore方法。
((IUndoObject)value).Undo();
}
}
}
//如果字典包含该字段，则还原。
else if (state.Contains(property.GetHashCode()))
{
this.SetValue(property, state[property.GetHashCode()]);
}
//检查值是否为集合，如果是，就对每项调用Restore方法。
var oldValue = state[property.GetHashCode()];
if (oldValue != null && oldValue is ICollection)
{
var col = (ICollection)oldValue;
foreach (var item in col)
{
if (item is IUndoObject)
{
((IUndoObject)item).Undo();
}
}
}
}
}
}
protected virtual void Backup()
{
if (____backup == null)
{
____backup = new Stack <byte[]>();
}
Type sourceType = this.GetType();
HybridDictionary state = new HybridDictionary();
ExtendProperty[] propertys;
// 获取所有字段信息。
propertys = ExtendPropertysProvider.GetByType(this.GetType());
foreach (ExtendProperty property in propertys)
{
object value = this.GetValue(property);
if (typeof(IBusinessObject).IsAssignableFrom(property.PropertyType))
{
if (value == null)
{
//值为空，我们也要保存。
state.Add(property.GetHashCode(), null);
}
else
{
// 不为空，而且是同一类型，则同时调用Backup方法。
((IUndoObject)value).Accept();
}
}
//检查字段类型是否为ICollection，以便为集合中的项进行备份。
else if (typeof(ICollection).IsAssignableFrom(property.PropertyType) && value != null && ((ICollection)value).Count > 0)
{
var col = (ICollection)value;
foreach (var item in col)
{
if (item is IUndoObject)
{
((IUndoObject)item).Accept();
}
}
state.Add(property.GetHashCode(), value);
}
else
{
//普通字段，加入字典。
state.Add(property.GetHashCode(), value);
}
}
//序列化，推上栈。
using (MemoryStream buffer = new MemoryStream())
{
BinaryFormatter formatter = new BinaryFormatter();
formatter.Serialize(buffer, state);
____backup.Push(buffer.ToArray());
}
}