<MySection333> <Command1> <![CDATA[ create procedure ChangeProductQuantity( @ProductID int, @Quantity int ) as update Products set Quantity = @Quantity where ProductID = @ProductID; ]]> </Command1> <Command2> <![CDATA[ create procedure DeleteCategory( @CategoryID int ) as delete from Categories where CategoryID = @CategoryID; ]]> </Command2> </MySection333>
实现代码如下：
public class MySection3 : ConfigurationSection { [ConfigurationProperty("Command1", IsRequired = true)] public MyTextElement Command1 { get { return (MyTextElement)this["Command1"]; } } [ConfigurationProperty("Command2", IsRequired = true)] public MyTextElement Command2 { get { return (MyTextElement)this["Command2"]; } } } public class MyTextElement : ConfigurationElement { protected override void DeserializeElement(System.Xml.XmlReader reader, bool serializeCollectionKey) { CommandText = reader.ReadElementContentAs(typeof(string), null) as string; } protected override bool SerializeElement(System.Xml.XmlWriter writer, bool serializeCollectionKey) { if( writer != null ) writer.WriteCData(CommandText); return true; } [ConfigurationProperty("data", IsRequired = false)] public string CommandText { get { return this["data"].ToString(); } set { this["data"] = value; } } }
小结：
1. 在实现上大体可参考MySection2，
2. 每个ConfigurationElement由我们来控制如何读写XML，也就是要重载方法SerializeElement，DeserializeElement
config文件 - Collection
<MySection444> <add key="aa" value="11111"></add> <add key="bb" value="22222"></add> <add key="cc" value="33333"></add> </MySection444>
这种类似的配置方式，在ASP.NET的HttpHandler, HttpModule中太常见了，想不想知道如何实现它们？ 代码如下：
小结：
1. 为每个集合中的参数项创建一个从ConfigurationElement继承的派生类，可参考MySection1
2. 为集合创建一个从ConfigurationElementCollection继承的集合类，具体在实现时主要就是调用基类的方法。
3. 在创建ConfigurationSection的继承类时，创建一个表示集合的属性就可以了，注意[ConfigurationProperty]的各参数。
config文件 - 读与写
前面我逐个介绍了4种自定义的配置节点的实现类，下面再来看一下如何读写它们。
读取配置参数：
MySection1 mySectioin1 = (MySection1)ConfigurationManager.GetSection("MySection111"); txtUsername1.Text = mySectioin1.UserName; txtUrl1.Text = mySectioin1.Url; MySection2 mySectioin2 = (MySection2)ConfigurationManager.GetSection("MySection222"); txtUsername2.Text = mySectioin2.Users.UserName; txtUrl2.Text = mySectioin2.Users.Password; MySection3 mySection3 = (MySection3)ConfigurationManager.GetSection("MySection333"); txtCommand1.Text = mySection3.Command1.CommandText.Trim(); txtCommand2.Text = mySection3.Command2.CommandText.Trim(); MySection4 mySection4 = (MySection4)ConfigurationManager.GetSection("MySection444"); txtKeyValues.Text = string.Join("\r\n", (from kv in mySection4.KeyValues.Cast<MyKeyValueSetting>() let s = string.Format("{0}={1}", kv.Key, kv.Value) select s).ToArray());
小结：在读取自定节点时，我们需要调用ConfigurationManager.GetSection()得到配置节点，并转换成我们定义的配置节点类，然后就可以按照强类型的方式来访问了。
写配置文件：
Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None); MySection1 mySectioin1 = config.GetSection("MySection111") as MySection1; mySectioin1.UserName = txtUsername1.Text.Trim(); mySectioin1.Url = txtUrl1.Text.Trim(); MySection2 mySection2 = config.GetSection("MySection222") as MySection2; mySection2.Users.UserName = txtUsername2.Text.Trim(); mySection2.Users.Password = txtUrl2.Text.Trim(); MySection3 mySection3 = config.GetSection("MySection333") as MySection3; mySection3.Command1.CommandText = txtCommand1.Text.Trim(); mySection3.Command2.CommandText = txtCommand2.Text.Trim(); MySection4 mySection4 = config.GetSection("MySection444") as MySection4; mySection4.KeyValues.Clear(); (from s in txtKeyValues.Lines let p = s.IndexOf('=') where p > 0 select new MyKeyValueSetting { Key = s.Substring(0, p), Value = s.Substring(p + 1) } ).ToList() .ForEach(kv => mySection4.KeyValues.Add(kv)); config.Save();