实现
假设某框架的配置节定义如下：
using System.Configuration;
public class ApplicationElement : ConfigurationElement {
[ConfigurationProperty("provider", IsKey=true, IsRequired=true)]
public string Provider {
get { return (string)base["provider"]; }
set { base["provider"] = value; }
}
}
public class ObjectContainerElement : ConfigurationElement {
[ConfigurationProperty("provider", IsKey=true, IsRequired=true)]
public string Provider {
get { return (string)base["provider"]; }
set { base["provider"] = value; }
}
}
[ConfigurationCollection(typeof(ObjectContainerElement),
AddItemName="objectContainer", CollectionType=ConfigurationElementCollectionType.BasicMap)]
public class ObjectContainerElementCollection :
ConfigurationElementCollection {
protected override string ElementName {
get { return "objectContainer"; }
}
public override ConfigurationElementCollectionType CollectionType {
get { return ConfigurationElementCollectionType.BasicMap; }
}
protected override ConfigurationElement CreateNewElement() {
return new ObjectContainerElement();
}
protected override object GetElementKey(ConfigurationElement element) {
return (element as ObjectContainerElement).Provider;
}
public void Add(ObjectContainerElement element) {
this.BaseAdd(element);
}
}
public class FrameworkConfigSection : ConfigurationSection {
[ConfigurationProperty("application", IsRequired=true)]
public ApplicationElement Application {
get { return (ApplicationElement)base["application"]; }
set { base["application"] = value; }
}
[ConfigurationProperty("objectContainers")]
public ObjectContainerElementCollection ObjectContainers {
get { return (ObjectContainerElementCollection)base["objectContainers"]; }
set { base["objectContainers"] = value; }
}
}
public class ApplicationElement : ConfigurationElement {
[ConfigurationProperty("provider", IsKey=true, IsRequired=true)]
public string Provider {
get { return (string)base["provider"]; }
set { base["provider"] = value; }
}
}
public class ObjectContainerElement : ConfigurationElement {
[ConfigurationProperty("provider", IsKey=true, IsRequired=true)]
public string Provider {
get { return (string)base["provider"]; }
set { base["provider"] = value; }
}
}
[ConfigurationCollection(typeof(ObjectContainerElement),
AddItemName="objectContainer", CollectionType=ConfigurationElementCollectionType.BasicMap)]
public class ObjectContainerElementCollection :
ConfigurationElementCollection {
protected override string ElementName {
get { return "objectContainer"; }
}
public override ConfigurationElementCollectionType CollectionType {
get { return ConfigurationElementCollectionType.BasicMap; }
}
protected override ConfigurationElement CreateNewElement() {
return new ObjectContainerElement();
}
protected override object GetElementKey(ConfigurationElement element) {
return (element as ObjectContainerElement).Provider;
}
public void Add(ObjectContainerElement element) {
this.BaseAdd(element);
}
}
public class FrameworkConfigSection : ConfigurationSection {
[ConfigurationProperty("application", IsRequired=true)]
public ApplicationElement Application {
get { return (ApplicationElement)base["application"]; }
set { base["application"] = value; }
}
[ConfigurationProperty("objectContainers")]
public ObjectContainerElementCollection ObjectContainers {
get { return (ObjectContainerElementCollection)base["objectContainers"]; }
set { base["objectContainers"] = value; }
}
}
根据上面的设计分析，配置源的实现如下：
public interface IConfigurationSource {
FrameworkConfigSection Config { get; }
}
public class ConfigFileConfigurationSource : IConfigurationSource {
private FrameworkConfigSection config;
public ConfigFileConfigurationSource() {
this.ReadFromConfigFile();
}
private void ReadFromConfigFile() {
this.config = (FrameworkConfigSection)
ConfigurationManager.GetSection("frameworkConfig");
}
public FrameworkConfigSection Config {
get { return this.config; }
}
}
public class RegularConfigurationSource : IConfigurationSource {
private FrameworkConfigSection config;
public RegularConfigurationSource() {
config = new FrameworkConfigSection();
config.Application = new ApplicationElement();
config.ObjectContainers = new ObjectContainerElementCollection();
}
public void AddElement(ObjectContainerElement element) {
config.ObjectContainers.Add(element);
}
public void SetElement(ApplicationElement element) {
config.Application = element;
}
public void AddObjectContainer(string provider) {
config.ObjectContainers.Add(new ObjectContainerElement
{ Provider = provider });
}
public void SetApplication(string provider) {
config.Application = new ApplicationElement
{ Provider = provider };
}
public FrameworkConfigSection Config {
get { return this.config; }
}
}
FrameworkConfigSection Config { get; }
}
public class ConfigFileConfigurationSource : IConfigurationSource {
private FrameworkConfigSection config;
public ConfigFileConfigurationSource() {
this.ReadFromConfigFile();
}
private void ReadFromConfigFile() {
this.config = (FrameworkConfigSection)
ConfigurationManager.GetSection("frameworkConfig");
}
public FrameworkConfigSection Config {
get { return this.config; }
}
}
public class RegularConfigurationSource : IConfigurationSource {
private FrameworkConfigSection config;
public RegularConfigurationSource() {
config = new FrameworkConfigSection();
config.Application = new ApplicationElement();
config.ObjectContainers = new ObjectContainerElementCollection();
}
public void AddElement(ObjectContainerElement element) {
config.ObjectContainers.Add(element);
}
public void SetElement(ApplicationElement element) {
config.Application = element;
}
public void AddObjectContainer(string provider) {
config.ObjectContainers.Add(new ObjectContainerElement
{ Provider = provider });
}
public void SetApplication(string provider) {
config.Application = new ApplicationElement
{ Provider = provider };
}
public FrameworkConfigSection Config {
get { return this.config; }
}
}
在框架中，通常需要一个引导器(BootStrapper)来启动一些框架所依赖的服务或者进行一些数据准备工作。为了简化描述，在此我们仅用上面实现部分介绍的Application以及ApplicationFactory来模拟引导器的这部分功能。首先定义IApplication接口，然后创建一个实现该接口的类Application：
public interface IApplication {
IConfigurationSource ConfigSource { get; }
}
public class Application : IApplication {
private readonly IConfigurationSource configSource;
public Application(IConfigurationSource configSource) {
this.configSource = configSource;
}
public IConfigurationSource ConfigSource {
get { return this.configSource; }
}
}
IConfigurationSource ConfigSource { get; }
}
public class Application : IApplication {
private readonly IConfigurationSource configSource;
public Application(IConfigurationSource configSource) {
this.configSource = configSource;
}
public IConfigurationSource ConfigSource {
get { return this.configSource; }
}
}
