关于c＃：如何使用自定义配置部分获取app.config值…？

How to get app.config value with using custom config sections…?

我想获取服务器地址值，但在警报方法中收到了一个null reference exception：

我的app.config如下：

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我的自定义配置部分如下所示：

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namespace SampleConsole
{
public class CustomAppTest
{
public void Alert()
{

Console.WriteLine(Values.Server.Key["CollectorServer"].Address);
}
}

public class Values
{

public static ServerValues Server = ConfigurationManager.GetSection("serverlist") as ServerValues;

}

public class ServerValues : ConfigurationSection
{

[ConfigurationProperty("", IsRequired = true, IsDefaultCollection = true)]
public ServerCollection Key
{
get { return (ServerCollection)this[""]; }
set { this[""] = value; }
}
}

public class ServerCollection : ConfigurationElementCollection
{

protected override ConfigurationElement CreateNewElement()
{
return new ServerElement();
}

protected override object GetElementKey(ConfigurationElement element)
{
return ((ServerElement)element).Name;
}

public new ServerElement this[string elementName]
{
get
{
return this.OfType<ServerElement>().FirstOrDefault(item => item.Name == elementName);
}
}
}

public class ServerElement : ConfigurationElement
{

[ConfigurationProperty("name", IsKey = true, IsRequired = true)]
public string Name
{
get { return (string)base["name"]; }
set { base["name"] = value; }
}

[ConfigurationProperty("address", IsRequired = true)]
public string Address
{
get { return (string)base["address"]; }
set { base["address"] = value; }
}
}}