[英]GetKey in ConfigurationElementCollection from ConfigurationPropertyAttribute?
There are a lot of examples out there that explain how to create your own ConfigurationElementCollection, for instance: Stackoverflow: How to implement your own ConfigurationElementCollection? 有很多示例可以解释如何创建自己的ConfigurationElementCollection,例如: Stackoverflow:如何实现自己的ConfigurationElementCollection?
One of the functions you'll have to override is GetElementKey: 您必须重写的功能之一是GetElementKey:
protected override object GetElementKey(ConfigurationElement element)
{
return ((ServiceConfig) element).Port;
}
where property Port is defined as follows: 其中属性端口定义如下:
[ConfigurationProperty("Port", IsRequired = true, IsKey = true)]
public int Port
{
get { return (int) this["Port"]; }
set { this["Port"] = value; }
}
My configuration has several ConfigurationElementCollections that look very similar. 我的配置有几个看起来非常相似的ConfigurationElementCollections。 The GetElementKey function is the only function that inhibits the use of a generic ConfigurationElementCollection because of the identifier of the key. 由于键的标识符,GetElementKey函数是唯一一个禁止使用通用ConfigurationElementCollection的函数。 The ConfigurationPropertyAttribute already informs me which property is the key. ConfigurationPropertyAttribute已经通知我哪个属性是关键。
Is it possible to get the Key property via the ConfigurationPropertyAttribute? 是否可以通过ConfigurationPropertyAttribute获取Key属性?
Code would be like: 代码如下:
public class ConfigCollection<T> : ConfigurationElementCollection where T: ConfigurationElement, new()
{
protected override Object GetElementKey(ConfigurationElement element)
{
// get the propertyInfo of property that has IsKey = true
PropertyInfo keyPropertyInfo = ...
object keyValue = keyPropertyInfo.GetValue(element);
return keyValue;
}
Yes, you can get all the properties of the element and look for the one that has a ConfigurationPropertyAttribute
with IsKey == true
: 是的,您可以获取元素的所有属性,并查找具有ConfigurationPropertyAttribute
且IsKey == true
:
protected override object GetElementKey(ConfigurationElement element)
{
object key = element.GetType()
.GetProperties()
.Where(p => p.GetCustomAttributes<ConfigurationPropertyAttribute>()
.Any(a => a.IsKey))
.Select(p => p.GetValue(element))
.FirstOrDefault();
return key;
}
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