/// <summary>
///
/// </summary>
/// <param name="source"></param>
/// <param name="mapper"></param>
/// <param name="disposing">释放回调</param>
public QueryResultEnumerator(IResultSource source, IResultMapper <TEntity> mapper, Action <int> disposing)
{
mapper.TearUp(source);
_disposing = disposing;
_source = source;
_mapper = mapper;
}
void IDisposable.Dispose()
{
_current = default(TEntity);
_mapper.TearDown();
_source.Dispose();
_disposing?.Invoke(_count);
_source = null;
}
public void TearUp(IResultSource source)
{
if (!IsSimpleType())
{
throw new InvalidProgramException("仅支持简单类型映射，如 int, short, long, decimal等");
}
underlyingType = Nullable.GetUnderlyingType(typeof(T));
this.source = source;
}
void IResultMapper <object> .TearUp(IResultSource source)
{
this.source = source;
}
/// <summary>
/// 初始化
/// </summary>
/// <param name="source"></param>
public void TearUp(IResultSource source)
{
this.source = source;
}
/// <summary>
/// 读取DataReader指定列的值
/// </summary>
/// <param name="source">源</param>
/// <param name="column">列序号</param>
/// <param name="convert">值转换器</param>
/// <returns></returns>
static object ReadValue(IResultSource source, int column, ValueConverter.ConvertDelegate convert)
{
return(convert(source[column]));
}
