public async Task <ServiceResult> DeleteAsync(long id)
{
var exist = await _tagRepo.Select.AnyAsync(c => c.Id == id);
if (!exist)
{
return(await Task.FromResult(ServiceResult.Failed($"Id:{id} 的文章标签不存在")));
}
// 先删除与文章的关系
await _articleTagRepo.DeleteAsync(a => a.TagId == id);
// 删除文章标签
await _tagRepo.DeleteAsync(id);
return(await Task.FromResult(ServiceResult.Successed("删除文章标签成功")));
}