如何在 ASP.NET Core 3.1 的整数集合中查询整数数组？

Question

我想查询一个整数集合。现在，我只能按整数数组中的第一个值进行过滤。如何查询包含整数数组中所有值的博客标签id集合？

 //list --> my blog posts variable

 ....
 if (f.blogTagIds != null)
 {
     list = list.Where(p => p.BlogTagRelation.Select(p => p.BlogTagId).Contains(f.blogTagIds[0]));
 }
 ....

搜索过滤器类

public class SearchFilterType
{
    ...  
    public int[] blogTagIds { get; set; }
    ...
}

ViewBag 博客标签

var BlogTags = new List<SelectListItem>();

foreach (var item in _uow.BlogTag.GetAllByEnabledDate(null, _uow.Cookie.GetAdminLangId, _uow.Cookie.GetAdminWebSiteId))
{
    BlogTags.Add(new SelectListItem
                     {
                         Text = item.Title,
                         Value = item.Id.ToString()
                     });
}

ViewBag.BlogTags = BlogTags;

过滤表单 BlogTagIds Select 控件

<select asp-for="f.blogTagIds" class="form-control" multiple="multiple" asp-items="ViewBag.BlogTags"></select>

BlogTagRelation.cs

    public partial class BlogTagRelation
{
    public int Id { get; set; }
    public int BlogId { get; set; }
    public int BlogTagId { get; set; }

    public virtual Blog Blog { get; set; }
    public virtual BlogTag BlogTag { get; set; }
}

示例路线

/Blog/list?f.blogTagIds=8&f.blogTagIds=6

Answer 1

尝试：

var list =list.Where(x => blogTagIds.All(r => x.BlogTagRelation.Any(y => y.BlogTag.BlogTagId== r)));

确保所有 blogTagId 都包含在 BlogTagRelation

结果：

[我 select 具有特殊 roleId 的用户]