我可以使用LINQ迭代/筛选web.config应用程序设置吗?

如果需要值,请尝试此操作:

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

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

可能是因为keyscollection只实现IEnumerable,而不是IEnumerable <T &。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;

我能想到以下几点

            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)