代码:
private IDbSet<Item> _Items;
private int _SearchTakeCount = 10;
public IList<string> SearchByArticleCount(int articleCount)
{
return _Items.AsNoTracking().Where(m => m.Articles.Count().Equals(articleCount))
.Take(_SearchTakeCount)
.Select(m => m.Articles.Count().ToString())
.Distinct()
.ToList();
}
我的控制器中的代码:
public virtual ActionResult AutoCompleteSearch(string term, KeywordSearchBy searchBy = KeywordSearchBy.Name)
{
IList<string> data = new List<string>();
switch (searchBy)
{
case ItemSearchBy.Name:
data = _ItemService.SearchByName(term);
break;
case ItemSearchBy.ArticleCount:
int articleCount = Convert.ToInt32(term);
data = _ItemService.SearchByArticleCount(articleCount);
break;
}
当我运行项目时,异常得到了证实。 这个例外是: LINQ to Entities无法识别方法&#39; System.String ToString()&#39;方法,并且此方法无法转换为商店表达式。
答案 0 :(得分:5)
在EF部分完成后,将ToString()
调用为LINQ to Objects查询:
public IList<string> SearchByArticleCount(int articleCount)
{
return _Items.AsNoTracking().Where(m => m.Articles.Count().Equals(articleCount))
.Take(_SearchTakeCount)
.Select(m => m.Articles.Count())
.Distinct()
.AsEnumerable()
.Select(x => x.ToString())
.ToList();
}