LabelTemplatePrintOrientationHelper.cs
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using Volo.Abp;
namespace FoodLabeling.Application.Helpers;
/// <summary>
/// 标签模板 <c>PrintOrientation</c> 归一化与校验（库值 / API：<c>vertical</c>、<c>horizontal</c>）。
/// </summary>
public static class LabelTemplatePrintOrientationHelper
{
/// <summary>竖打</summary>
public const string Vertical = "vertical";
/// <summary>横打</summary>
public const string Horizontal = "horizontal";
/// <summary>
/// 空或未识别时默认 <see cref="Vertical"/>；横打时不交换 Width/Height。
/// </summary>
public static string Normalize(string? raw)
{
var v = (raw ?? string.Empty).Trim().ToLowerInvariant();
return v == Horizontal ? Horizontal : Vertical;
}
/// <summary>
/// 非空且非 vertical/horizontal 时抛出友好异常。
/// </summary>
public static void EnsureValidOrThrow(string? raw)
{
if (string.IsNullOrWhiteSpace(raw))
{
return;
}
var v = raw.Trim().ToLowerInvariant();
if (v is Vertical or Horizontal)
{
return;
}
throw new UserFriendlyException("printOrientation 仅支持 vertical 或 horizontal");
}
}