通过ConfigurationSection来轻松地加载配置文件

最近写了一段自定义的ConfigurationSection继承类，通过该class可以轻松得定义和读取配置文件信息，
注意这里使用的是c# 2.0来实现的，相比1.1必须通过实现IConfigurationSectionHandler接口来自定义配置节点类方便多了
不论是web.config还是app.config，都可以使用ConfigurationManager类加载配置文件中自定义的节点内容。

以下是配置文件的层次结构:

 1<?xml version="1.0" encoding="utf-8" ?>
 2<configuration>
 3  <configSections>
 4    <section name="orders" type="ConsoleTest.OrdersSection, ConsoleTest"/>
 5  </configSections>
 6  <orders companyID="2001">
 7    <order number="100001" amount="222.22">
 8      <lineItems warehouseNumber="02">
 9        <lineItem number="00-000-001" description="wii"/>
10      </lineItems>
11    </order>
12    <order number="300001" amount="33.33">
13      <lineItems warehouseNumber="99">
14        <lineItem number="00-000-001" description="xbox 360"/>
15        <lineItem number="00-000-003" description="playstation 3"/>
16      </lineItems>
17    </order>
18  </orders>
19</configuration>

注意order和lineItem节点都是允许重复出现的

以下是继承自ConfigurationSection的自定义配置节点类：

  1public class OrdersSection : ConfigurationSection
  2    {
  3        [ConfigurationProperty("companyID", IsRequired = true)]
  4        public string CompanyID
  5        {
  6            get
  7            {
  8                return (string)base["companyID"];
  9            }
 10            set
 11            {
 12                base["companyID"] = value;
 13            }
 14        }
 15
 16        [ConfigurationProperty("", IsDefaultCollection = true)]
 17        public OrderElementCollection Orders
 18        {
 19            get
 20            {
 21                return (OrderElementCollection)base[""];
 22            }
 23        }
 24    }
 25
 26    public class OrderElementCollection : ConfigurationElementCollection
 27    {
 28        protected override ConfigurationElement CreateNewElement()
 29        {
 30            return new OrderElement();
 31        }
 32        protected override object GetElementKey(ConfigurationElement element)
 33        {
 34            return ((OrderElement)element).Number;
 35        }
 36
 37        public override ConfigurationElementCollectionType CollectionType
 38        {
 39            get
 40            {
 41                return ConfigurationElementCollectionType.BasicMap;
 42            }
 43        }
 44        protected override string ElementName
 45        {
 46            get
 47            {
 48                return "order";
 49            }
 50        }
 51
 52        public OrderElement this[int index]
 53        {
 54            get
 55            {
 56                return (OrderElement)BaseGet(index);
 57            }
 58            set
 59            {
 60                if (BaseGet(index) != null)
 61                {
 62                    BaseRemoveAt(index);
 63                }
 64                BaseAdd(index, value);
 65            }
 66        }
 67    }
 68
 69    public class OrderElement : ConfigurationElement
 70    {
 71        [ConfigurationProperty("number", IsRequired = true)]
 72        public string Number
 73        {
 74            get
 75            {
 76                return (string)base["number"];
 77            }
 78            set
 79            {
 80                base["number"] = value;
 81            }
 82        }
 83
 84        [ConfigurationProperty("amount", IsRequired = true)]
 85        public double Amount
 86        {
 87            get
 88            {
 89                return (double)base["amount"];
 90            }
 91            set
 92            {
 93                base["amount"] = value;
 94            }
 95        }
 96
 97        [ConfigurationProperty("lineItems", IsDefaultCollection = true)]
 98        public LineItemElementCollection LineItems
 99        {
100            get
101            {
102                return (LineItemElementCollection)base["lineItems"];
103            }
104        }
105    }
106
107    public class LineItemElementCollection : ConfigurationElementCollection
108    {
109        [ConfigurationProperty("warehouseNumber", IsRequired = true)]
110        public string WarehouseNumber
111        {
112            get
113            {
114                return (string)base["warehouseNumber"];
115            }
116            set
117            {
118                base["warehouseNumber"] = value;
119            }
120        }
121
122        protected override ConfigurationElement CreateNewElement()
123        {
124            return new LineItemElement();
125        }
126        protected override object GetElementKey(ConfigurationElement element)
127        {
128            return ( (LineItemElement)element ).Number;
129        }
130
131        public override ConfigurationElementCollectionType CollectionType
132        {
133            get
134            {
135                return ConfigurationElementCollectionType.BasicMap;
136            }
137        }
138        protected override string ElementName
139        {
140            get
141            {
142                return "lineItem";
143            }
144        }
145
146        public LineItemElement this[int index]
147        {
148            get
149            {
150                return (LineItemElement)BaseGet(index);
151            }
152            set
153            {
154                if (BaseGet(index) != null)
155                {
156                    BaseRemoveAt(index);
157                }
158                BaseAdd(index, value);
159            }
160        }
161    }
162
163    public class LineItemElement : ConfigurationElement
164    {
165        [ConfigurationProperty("number", IsKey=true, IsRequired = true)]
166        public string Number
167        {
168            get
169            {
170                return (string)base["number"];
171            }
172            set
173            {
174                base["number"] = value;
175            }
176        }
177
178        [ConfigurationProperty("description", IsRequired = true)]
179        public string Description
180        {
181            get
182            {
183                return (string)base["description"];
184            }
185            set
186            {
187                base["description"] = value;
188            }
189        }
190    }