/// <summary>
/// 读取一个可空类型的值。
/// </summary>
/// <typeparam name="T">值类型</typeparam>
/// <returns>返回 Null 或该值类型的值</returns>
public T?ReadNullable <T>() where T : struct
{
dataReader.OnReadValue(key, valueCopyer);
return(valueCopyer.ReadNullable <T>());
}
/// <summary>
/// 读取一个可空类型的值。
/// </summary>
/// <typeparam name="TValue">值类型</typeparam>
/// <returns>返回 Null 或该值类型的值</returns>
public TValue?ReadNullable <TValue>() where TValue : struct
{
dataRW.OnReadValue(key, valueCopyer);
return(valueCopyer.ReadNullable <TValue>());
}