/// <summary>
/// 读取可空8字节无符号整型值
/// </summary>
/// <param name="row">数据行</param>
/// <param name="columns">列集合</param>
/// <param name="columnName">列名称</param>
/// <returns>8字节无符号整型结果</returns>
protected UInt64?LoadNullableUInt64(DataRow row, DataColumnCollection columns, String columnName)
{
if (columns.Contains(columnName) && !Convert.IsDBNull(row[columnName]))
{
return(DbConvert.ToUInt64(row[columnName]));
}
else
{
return(null);
}
}
/// <summary>
/// 读取可空8字节无符号整型值
/// </summary>
/// <param name="args">对象创建参数</param>
/// <param name="columnName">列名称</param>
/// <returns>8字节无符号整型结果</returns>
protected UInt64?LoadNullableUInt64(EntityCreatingArgs args, String columnName)
{
if (args.Columns.Contains(columnName) && !DbConvert.IsDBNull(args.Row[columnName]))
{
return(DbConvert.ToUInt64(args.Row[columnName]));
}
else
{
return(null);
}
}