/// <summary>
/// 创建实例。
/// </summary>
/// <param name="query">数据查询。</param>
/// <param name="reader">数据查询读取器。</param>
/// <param name="type">类型。</param>
public DataQueryEnumerator(IDataQuery <T> query, IDataQueryReader reader, System.Type type)
{
_query = query;
_reader = reader;
_dataBinderObjectCache = query?.DataBinderObjectCache;
_type = type;
query?.DataContext.DisposableObjects.Add(this);
}
void DisposeDataBinderObjectCache()
{
if (_dataBinderObjectCacheMyCreated)
{
_dataBinderObjectCache?.Dispose();
_dataBinderObjectCacheMyCreated = false;
}
_dataBinderObjectCache = null;
}
/// <summary>
/// 获取迭代器。
/// </summary>
/// <returns></returns>
public virtual System.Collections.Generic.IEnumerator <T> GetEnumerator()
{
if (_dataBinderObjectCache == null)
{
_dataBinderObjectCache = new Binding.DataBinderObjectCache();
_dataBinderObjectCacheMyCreated = true;
}
return(new DataQueryEnumerator <T>(_dataContext, ExecuteReader(), Type)
{
Callback = Callback, DataBinderObjectCache = _dataBinderObjectCache
});
}
