/// <summary>
/// 获取包含指定列的的第一个表的首行对应列的值
/// 获取不到则返回类型默认值
/// </summary>
/// <param name="column"></param>
/// <returns></returns>
public static string?GetFirstValueOrDefault(this IDataTableCollection dataTables, string column)
{
foreach (var table in dataTables)
{
if (table.Columns.Contains(column))
{
return(table.GetFirstValueOrDefault(column));
}
}
return(default);
/// <summary>
/// 确保没有错误的表格
/// </summary>
/// <param name="dataTables"></param>
/// <exception cref="InfluxdbException"></exception>
/// <returns></returns>
public static IDataTableCollection EnsureNoError(this IDataTableCollection dataTables)
{
const string ErrorColumn = "error";
foreach (var table in dataTables)
{
if (table.TableType == TableType.Error)
{
var err = table.GetFirstValueOrDefault(ErrorColumn) ?? "未知错误 ";
throw new InfluxdbException(new InfuxdbError {
Err = err
});
}
}
return(dataTables);
}
