C# 使用LINQ读取app.config
我已经实现(使用C# 使用LINQ读取app.config,c#,linq,app-config,linq-to-objects,C#,Linq,App Config,Linq To Objects,我已经实现(使用System.Configurationnamespace)并配置了nextApp.config结构: <bot> <strategies> <add name="TestStrategy" type="Bot.Strategy.Test" > <indicators> <add name="Foo" type="Bot.Indicators.Fo
System.Configuration
namespace)并配置了nextApp.config
结构:
<bot>
<strategies>
<add name="TestStrategy" type="Bot.Strategy.Test" >
<indicators>
<add name="Foo" type="Bot.Indicators.Foo, Bot" />
<add name="Bar" type="Bot.Indicators.Bar, Bot" />
</indicators>
<orders>
<add id="123" amount="0.1" />
</orders>
</add>
</strategies>
</bot>
如果正确定义了
BotSection
,则可以执行此操作(注意子查询):
就我个人而言,我不会跳过不具体的类型(就像您在
where
子句中所做的那样),但我会抛出一个描述实际问题的特定异常,或者让Activator
为您抛出该异常。您可以将strategyType
和子查询的创建重构为一个方法,然后执行选择CreateStrategy(strategy)
,但这并不能真正删除嵌套查询。我不知道还有别的办法。
class TestStrategy : IStrategy
{
public TestStrategy(IEnumerable<IIndicator> indicators, IEnumerable<Order> orders) { }
}
interface IIndicator { }
class Order
{
public int ID { get; set; }
public double Amount { get; set; }
}
var section = ((BotSection)ConfigurationManager.GetSection("bot"));
return from strategy in section.Strategies
let strategyType = Type.GetType(strategy.Type)
where !strategyType.IsInterface && !strategyType.IsAbstract && typeof(IStrategy).IsAssignableFrom(strategyType)
select (IStrategy)Activator.CreateInstance(strategyType, ?);
return
from strategy in section.Strategies
let strategyType = Type.GetType(strategy.Type)
where !strategyType.IsInterface && !strategyType.IsAbstract
&& typeof(IStrategy).IsAssignableFrom(strategyType)
let indicators = (
from indicator in strategy.Indicators
let indicatorType = Type.GetType(indicator.Type)
select (IIndicator)Activator.CreateInstance(indicatorType))
let orders = (
from order in strategy.Orders
let id = order.Id
select new Order { Id = order.Id, Amount = order.Amount })
select (IStrategy)Activator.CreateInstance(strategyType, indicators, orders);