我構建了一個以LINQ查詢結果爲表格的頁面。無法將lambda表達式轉換爲類型'string',因爲它不是委託類型
- 在將'查詢'保存到'this.articles'的'SetupArticleQuery()'方法中設置基本查詢。
- 運行另一種方法'UpdateFilter()'對保存在'this.articles'中的結果進行一些過濾。
我得到的錯誤
無法轉換lambda表達式到類型 '串',因爲它不是一個委託類型
在該行的代碼
this.articles = from art in this.articles
where art.category_id == this.categoryId
select art;
任何想法如何修復下面的代碼?
namespace WebApplication3 {
public partial class _Default : System.Web.UI.Page {
private IQueryable articles;
protected void Page_Load(object sender, EventArgs e) {
this.SetupArticleQuery();
this.UpdateFilter();
}
private void SetupArticleQuery() {
this.articles = from a in KB.Articles
join t in KB.Teams on a.primary_team_id equals t.id
join cat in KB.Categories on a.category_id equals cat.id
join scat in KB.SubCategories on a.subcategory_id equals scat.id
join top in KB.Topics on a.topic_id equals top.id
select new {
a.id,
a.title,
a.view_count,
a.created_at,
a.created_by,
a.primary_team_id,
primary_team_name = t.name,
category_id = cat.id,
category_name = cat.name,
subcategory_id = scat.id,
subcategory_name = scat.name,
topic_id = top.id,
topic_name = top.name
};
}
private void UpdateFilter() {
if (this.categoryId > 0) {
this.articles = from art in this.articles
where art.category_id == this.categoryId
select art;
}
}
}
我有同樣的問題,因爲我只是想念我使用System.Linq; – markmnl 2012-06-25 04:00:58