我可以使用 Linq 来迭代/过滤我的 web.config AppSettings 吗？

发布于 2024-08-04 08:51:31 字数 536 浏览 5 评论 0 原文

我正在尝试弄清楚如何使用 Linq 从 web.config 文件中过滤掉一些应用程序设置。

我正在尝试做类似以下的事情（语法错误）：-

var query = from q in System.Web.Configuration.WebConfigurationManager.AppSettings.Keys
            where q.StartsWith("Foo")
            select q);

我做错了什么？

编辑：添加了 screenie（这里是指向它的链接）

替代文本 http://img21.imageshack.us/img21/5516/errorji.png

原文

i'm trying to figure out how I can use Linq to filter out some of my appsettings from my web.config file.

i'm trying to do something like the following (which has wrong syntax) :-

var query = from q in System.Web.Configuration.WebConfigurationManager.AppSettings.Keys
            where q.StartsWith("Foo")
            select q);

what have I done wrong?

edit: added screenie (here's a link to it)

alt text http://img21.imageshack.us/img21/5516/errorji.png

分享到QQ

分享到微博

如果你对这篇内容有疑问，欢迎到本站社区发帖提问参与讨论，获取更多帮助，或者扫码二维码加入 Web 技术交流群。

发布评论

需要登录才能够评论，你可以免费注册一个本站的账号。

骷髅 2024-08-11 08:51:31

如果您想要这些值，请尝试以下操作：

var settings = System.Web.Configuration.WebConfigurationManager.AppSettings;

var query = from string q in settings.Keys
            where q.StartsWith("Foo")
            select settings[q];

Try this if you want the values:

var settings = System.Web.Configuration.WebConfigurationManager.AppSettings;

var query = from string q in settings.Keys
            where q.StartsWith("Foo")
            select settings[q];

回复收藏 0 原文

原谅过去的我 2024-08-11 08:51:31

可能是因为 KeysCollection 仅实现 IEnumerable 而不是 IEnumerable>。首先尝试在 Keys 属性上使用 Cast 方法，例如：

var query = from q in System.Web.Configuration.WebConfigurationManager.AppSettings.Keys.Cast<string>()
        where q.StartsWith("Foo")
        select q;

Could be because KeysCollection only implements IEnumerable not IEnumerable<T>. Try using the Cast method on the Keys property first, something like:

var query = from q in System.Web.Configuration.WebConfigurationManager.AppSettings.Keys.Cast<string>()
        where q.StartsWith("Foo")
        select q;

回复收藏 0 原文

被你宠の有点坏 2024-08-11 08:51:31

我能够想到以下内容

            var appStngVals = from s in ConfigurationManager.AppSettings.OfType<string>()
                      where s.StartsWith("Foo")
                      select ConfigurationManager.AppSettings[s];

（适用于控制台应用程序）

I was able to think of the following

            var appStngVals = from s in ConfigurationManager.AppSettings.OfType<string>()
                      where s.StartsWith("Foo")
                      select ConfigurationManager.AppSettings[s];

(as applicable to a console app)

回复收藏 0 原文

~没有更多了~