/// <summary>
/// 设置字段值
/// </summary>
/// <param name="target">拥有该成员的类实例</param>
/// <param name="value">字段/属性值</param>
private void Set(object target, object value)
{
if (_setter == null)
{
_setter = FieldAccessor.InitializeSetter(this.Member);
}
value = value ?? TypeUtils.GetNullValue(this.Member.FieldType);
_setter(target, value);
}
/// <summary>
/// 设置属性值
/// </summary>
/// <param name="target">拥有该成员的类实例</param>
/// <param name="value">字段/属性值</param>
private void Set(object target, object value)
{
if (!this.Member.CanWrite)
{
throw new XFrameworkException("{0} is unwritable", base.FullName);
}
_setter = _setter ?? PropertyAccessor.InitializeSetter(this.Member);
_setter(target, value ?? TypeUtils.GetNullValue(this.Member.PropertyType));
}
/// <summary>
/// 动态访问成员
/// </summary>
/// <param name="target">拥有该成员的类实例</param>
/// <param name="parameters">字段/属性值</param>
public override object Invoke(object target, params object[] parameters)
{
if (parameters != null && parameters.Length == 0)
{
// get
object obj = Get(target);
return(obj);
}
else
{
// set
Set(target, parameters != null ? parameters[0] : TypeUtils.GetNullValue(base.CLRType));
return(null);
}
}
/// <summary>
/// 将 <see cref="IDataRecord"/> 上的当前行反序列化为实体
/// </summary>
/// <param name="prevModel">前一行数据</param>
/// <param name="isThisLine">是否同一行数据</param>
/// <returns></returns>
internal object Deserialize(object prevModel, out bool isThisLine)
{
isThisLine = false;
#region 基元类型
if (_isPrimitive == null)
{
_isPrimitive = TypeUtils.IsPrimitiveType(_entityType) || _reader.GetName(0) == AppConst.AUTO_INCREMENT_NAME;
}
if (_isPrimitive.Value)
{
if (_reader.IsDBNull(0))
{
return(TypeUtils.GetNullValue(_entityType)); //default(T);
}
var obj = _reader.GetValue(0);
if (obj.GetType() != _entityType)
{
// fix#Nullable<T> issue
if (!_entityType.IsGenericType)
{
obj = Convert.ChangeType(obj, _entityType);
}
else
{
Type type2 = _entityType.GetGenericTypeDefinition();
if (type2 != typeof(Nullable <>))
{
throw new NotSupportedException(string.Format("type {0} not suppored.", type2.FullName));
}
obj = Convert.ChangeType(obj, Nullable.GetUnderlyingType(_entityType));
}
}
return(obj);
}
#endregion
#region 动态类型
if (_isDynamic)
{
ExpandoObject obj = new ExpandoObject();
var result = ((IDictionary <string, object>)obj);
for (int i = 0; i < _reader.FieldCount; i++)
{
var value = _reader.GetValue(i);
if (value == DBNull.Value)
{
value = null;
}
result.Add(_reader.GetName(i), value);
}
return((dynamic)obj);
}
#endregion
#region 实体类型
object model = null;
if (_map == null || _map.SelectedNavs == null || _map.SelectedNavs.Count == 0)
{
// 没有字段映射说明或者没有导航属性
if (_entityDeserializer == null)
{
_entityDeserializer = _deserializerImpl.GetTypeDeserializer(_entityType, _reader, _map != null ? _map.SelectedColumns : null, 0);
}
model = _entityDeserializer(_reader);
}
else
{
// 第一层
if (_entityDeserializer == null)
{
_entityDeserializer = _deserializerImpl.GetTypeDeserializer(_entityType, _reader, _map.SelectedColumns, 0, _map.SelectedNavs.MinIndex);
}
model = _entityDeserializer(_reader);
// 若有 1:n 的导航属性，判断当前行数据与上一行数据是否相同
if (prevModel != null && _map.HasMany)
{
isThisLine = true;
foreach (var m in _typeRuntime.KeyMembers)
{
var value1 = m.Invoke(prevModel);
var value2 = m.Invoke(model);
isThisLine = isThisLine && value1.Equals(value2);
if (!isThisLine)
{
// Fix issue#换行时清空上一行的导航键缓存
_manyNavigationKeys.Clear();
break;
}
}
}
// 递归导航属性
this.Deserialize_Navigation(isThisLine ? prevModel : null, model, string.Empty, isThisLine);
}
return(model);
#endregion
}
