c# - ASP.NET Core Web API 中的过滤结果

Question

因此，我正在创建一个数据库，允许用户创建“神奇项目”，然后将其上传到我的 ASP.net Web API。这很好用。我想通过从 api 中提取所有这些项目来在我的网页中显示它们。这也很好用。但现在，当我尝试过滤、排序或限制搜索量时，我仍然可以获得返回给我的每个项目的基本列表。现在，只有 14 个条目，所以没什么大不了的，但我仍然想完成这个。但无论我做什么，它总是返回完整的列表。

这是 Visual Studio 中的 ASP.net Controller :

[Route("api/v1/MagicItem")]
public class MagicItemController : Controller
{
    private ItemListContext context;

    public MagicItemController(ItemListContext context)
    {
        this.context = context;
    }

    [Produces("application/json")]
    [HttpGet]
    //public List<MagicItem> GetAllItems(string name, string category, string rarity, int? page, string sort, int limit = 5, string dir = "desc")
    public List<MagicItem> GetAllItems(
        string name, 
        string category, 
        string rarity, 
        int? page, 
        string sort,
        int limit = 5,
        string dir = "desc")
    {
        IQueryable<MagicItem> query = context.MagicItems;

        if (!string.IsNullOrWhiteSpace(name))
            query = query.Where(d => d.Name.Contains(name));
        if (!string.IsNullOrWhiteSpace(category))
            query = query.Where(d => d.Category == category);
        if (!string.IsNullOrWhiteSpace(rarity))
            query = query.Where(d => d.Rarity == rarity);


        if (!string.IsNullOrWhiteSpace(sort))
        {
            switch (sort)
            {
                case "Name":
                    if (dir == "asc")
                        query = query.OrderBy(d => d.Name);
                    else if (dir == "desc")
                        query = query.OrderByDescending(d => d.Name);
                    break;
                case "Rarity":
                    if (dir == "asc")
                        query = query.OrderBy(d => d.Rarity);
                    else if (dir == "desc")
                        query = query.OrderByDescending(d => d.Rarity);
                    break;
                case "Category":
                    if (dir == "asc")
                        query = query.OrderBy(d => d.Category);
                    else if (dir == "desc")
                        query = query.OrderByDescending(d => d.Category);
                    break;
            }
        }
        query = query.Take(limit);
        if (page.HasValue)
            query = query.Skip(page.Value * limit);

        return context.MagicItems.ToList();
    }
}

Answer 1

你就快到了:

只需使用:

return query.ToList();

而不是:

return context.MagicItems.ToList();