Question

我需要使用包含数据库数据的模型填充我的文章ViewModel，但我有一个方法需要分配给我的一个属性

图像列表是需要该方法的属性。对于文章列表中的每个项，都会调用该方法一次。

这是我的代码：

        public ActionResult ArticleTypes(string at)
        {
            articleViewModel.Images = new List<ImageInfo>();
            var query = (from a in db.Articles
                         where a.SelectedArticleType == at
                         select new ArticlesViewModel
                         {
                             Id = a.Id,
                             Body = a.Body,
                             Headline = a.Headline,
                             PostedDate = a.PostedDate,
                             SelectedArticleType = a.SelectedArticleType,
                             UserName = a.UserName,


                         }).ToList();
            articleViewModel.Images = imageService.GetImagesForArticle(articlemodel.Id.ToString());


            return View(query);
    }

我也尝试将方法放在linq中：

public ActionResult ArticleTypes(string at)
    {
        articleViewModel.Images = new List<ImageInfo>();
        var query = (from a in db.Articles
                     where a.SelectedArticleType == at
                     select new ArticlesViewModel
                     {
                         Id = a.Id,
                         Body = a.Body,
                         Headline = a.Headline,
                         PostedDate = a.PostedDate,
                         SelectedArticleType = a.SelectedArticleType,
                         UserName = a.UserName,
                         Images = imageService.GetImagesForArticle(a.Id.ToString())
                     }).ToList();



        return View(query);
}

它引发了一个例外：类型＆＃39; System.NotSupportedException＆＃39;的例外情况发生在EntityFramework.SqlServer.dll中但未在用户代码中处理

其他信息：LINQ to Entities无法识别方法＆＃39; System.Collections.Generic.List`1 [New_MinecraftNews_Webiste_MVC.Models.ImageInfo] GetImagesForArticle

Answer 1

我在最后添加了一个foreach循环，但它确实有效：

    public ActionResult ArticleTypes(string at)
    {
        articleViewModel.Images = new List<ImageInfo>();
        var modelList = (from a in db.Articles
                     where a.SelectedArticleType == at
                     select new ArticlesViewModel
                     {
                         Id = a.Id,
                         Body = a.Body,
                         Headline = a.Headline,
                         PostedDate = a.PostedDate,
                         SelectedArticleType = a.SelectedArticleType,
                         UserName = a.UserName
                     }).ToList();


        foreach (var model in modelList)
        {
            model.Images = imageService.GetImagesForArticle(model.Id.ToString());
        }


        return View(modelList);
}

使用带有方法的数据模型填充视图模型

1 个答案: