public bool MoveNext()
{
if (++_index >= _properties.Count)
{
return(false);
}
var property = _properties[_index];
if (property.IsReadOnly)
{
_current = new ManagedPropertyField
{
_property = property,
_value = (property as IManagedPropertyInternal).ProvideReadOnlyValue(_mpo)
};
}
else
{
_current = _mpo._compiledFields[property.TypeCompiledIndex];
if (!_current.HasValue)
{
_current = new ManagedPropertyField
{
_property = property,
_value = property.GetMeta(_mpo).DefaultValue
};
}
}
return(true);
}
internal CompiledPropertyValuesEnumerator(ManagedPropertyObject mpo)
{
_index = -1;
_mpo = mpo;
_current = new ManagedPropertyField();
_properties = mpo.PropertiesContainer.GetCompiledProperties();
}
/// <summary>
/// LoadProperty 直接设置值，不发生 PropertyChanged 事件。
/// </summary>
/// <param name="property"></param>
/// <param name="value"></param>
private void _LoadProperty(IManagedProperty property, object value)
{
CheckEditing(property);
value = CoerceType(property, value);
if (NeedReset(property, value))
{
this._ResetProperty(property);
return;
}
if (property.LifeCycle == ManagedPropertyLifeCycle.Compile)
{
this._compiledFields[property.TypeCompiledIndex]._value = value;
}
else
{
if (this._runtimeFields == null)
{
this._runtimeFields = new Dictionary <IManagedProperty, ManagedPropertyField>();
}
var field = new ManagedPropertyField
{
_property = property,
_value = value
};
this._runtimeFields[property] = field;
}
}
internal NonDefaultPropertyValuesEnumerator(ManagedPropertyObject mpo)
{
_index = -1;
_mpo = mpo;
_current = new ManagedPropertyField();
_runtimeFields = null;
_enumerateRuntimeFields = false;
}
public bool MoveNext()
{
if (++_index >= _properties.Count)
{
return(false);
}
var property = _properties[_index];
_current = _mpo._compiledFields[property.TypeCompiledIndex];
if (!_current.HasValue)
{
_current = new ManagedPropertyField
{
_property = property,
_value = property.GetMeta(_mpo).DefaultValue
};
}
return(true);
}
public bool MoveNext()
{
_index++;
var compiledFields = _mpo._compiledFields;
//编译期属性
var compiledFieldLength = compiledFields.Length;
while (_index < compiledFieldLength)
{
var field = compiledFields[_index];
if (field.HasValue)
{
var defaultValue = field.Property.GetMeta(this).DefaultValue;
if (!object.Equals(field.Value, defaultValue))
{
_current = field;
return(true);
}
}
_index++;
}
//第一次进入运行时属性遍历
if (!_enumerateRuntimeFields)
{
var rf = _mpo._runtimeFields;
if (rf != null)
{
var values = rf.Values;
_runtimeFields = new ManagedPropertyField[values.Count];
values.CopyTo(_runtimeFields, 0);
}
_enumerateRuntimeFields = true;
}
//开始遍历运行时属性。
if (_runtimeFields != null)
{
var runtimeFieldsCount = _runtimeFields.Length;
while (true)
{
var runtimeIndex = _index - compiledFieldLength;
if (runtimeIndex >= runtimeFieldsCount)
{
break;
}
var field = _runtimeFields[runtimeIndex];
if (field.HasValue)
{
var defaultValue = field.Property.GetMeta(this).DefaultValue;
if (!object.Equals(field.Value, defaultValue))
{
_current = field;
return(true);
}
}
_index++;
}
}
return(false);
}
/// <summary>
/// 设置某个属性的值。
/// </summary>
/// <param name="property"></param>
/// <param name="value"></param>
/// <param name="source"></param>
/// <returns>返回最终使用的值。</returns>
private object _SetProperty(IManagedProperty property, object value, ManagedPropertyChangedSource source)
{
object finalValue = null;
CheckEditing(property);
var meta = property.GetMeta(this) as IManagedPropertyMetadataInternal;
finalValue = meta.DefaultValue;
value = CoerceType(property, value);
bool isReset = false;
if (NeedReset(property, value))
{
isReset = true;
value = meta.DefaultValue;
}
bool cancel = meta.RaisePropertyChangingMetaEvent(this, ref value, source);
if (!cancel)
{
bool hasOldValue = false;
object oldValue = null;
//这个 if 块中的代码：查找或创建对应 property 的 field，同时记录可能存在的历史值。
if (property.LifeCycle == ManagedPropertyLifeCycle.Compile)
{
var index = property.TypeCompiledIndex;
var field = this._compiledFields[index];
if (field.HasValue)
{
oldValue = field.Value;
hasOldValue = true;
}
if (isReset)
{
this._compiledFields[index].ResetValue();
}
else
{
this._compiledFields[index]._value = value;
}
}
else
{
if (this._runtimeFields == null)
{
if (!isReset)
{
this._runtimeFields = new Dictionary <IManagedProperty, ManagedPropertyField>();
}
}
else
{
var oldField = new ManagedPropertyField();
if (this._runtimeFields.TryGetValue(property, out oldField))
{
oldValue = oldField.Value;
hasOldValue = true;
}
}
if (isReset)
{
if (hasOldValue)
{
this._runtimeFields.Remove(property);
}
}
else
{
//使用新的 field
var field = new ManagedPropertyField
{
_property = property,
_value = value
};
if (hasOldValue)
{
this._runtimeFields[property] = field;
}
else
{
this._runtimeFields.Add(property, field);
}
}
}
if (!hasOldValue)
{
oldValue = meta.DefaultValue;
}
if (!object.Equals(oldValue, value))
{
var args = new ManagedPropertyChangedEventArgs(property, oldValue, value, source);
//发生 Meta 中的回调事件
meta.RaisePropertyChangedMetaEvent(this, args);
//发生外部事件
this.RaisePropertyChanged(args);
finalValue = value;
}
}
return(finalValue);
}