private void AddConstraint(PropertyCompareOperator op, object val)
{
if (_pending == null)
{
throw new InvalidOperationException("查询构造出错：你必须先调用方法 Constrain。");
}
//如果没有指定属性对应的实体类型，则使用当前仓库对应的实体来作为属性的拥有者。
var propertyOwner = _pendingOwner;
if (propertyOwner == null)
{
propertyOwner = _pending.OwnerType;
if (_repo.EntityType.IsSubclassOf(propertyOwner))
{
propertyOwner = _repo.EntityType;
}
}
var constraint = new PropertyConstraint
{
Context = this,
Property = _pending,
ConcreteType = propertyOwner,
Operator = op,
Value = val
};
this.AddConstraint(constraint);
_pending = null;
_pendingOwner = null;
}
private PropertyConstraint ConstrainProperty(PropertyComparisonExpression exp)
{
var constraint = new PropertyConstraint(exp)
{
Context = Context,
};
return(constraint);
}
