#c# #asp.net #asp.net-mvc-4 #web-config #configurationmanager
#c# #asp.net #asp.net-mvc-4 #web-config #configurationmanager
Вопрос:
ASP.NET Приложению MVC4 требуется список чтения из файла web.config.
web.config содержит
<?xml version="1.0" encoding="utf-8"?>
<configuration>
<configSections>
<sectionGroup name="connectionGroup">
<section
name="connection"
type="Helpers.connectionSection"
allowLocation="true"
allowDefinition="Everywhere"
/>
</sectionGroup>
</configSections>
<connectionGroup>
<connection url="site1" database="db1" />
<connection url="site2" database="db2" />
</connectionGroup>
код для перечисления это:
IList<ConnectionSection> connection =
(IList<ConnectionSection>)ConfigurationManager.GetSection("connectionGroup");
foreach (var s in connection)
Debug.WriteLine(s.Url);
его запуск приводит к ошибке
Parser Error Message: Sections must only appear once per config file. See the help topic <location> for exceptions.
Source Error:
Line 19: <connectionGroup>
Line 20: <connection url="site1" database="site1" />
Line 21: <connection url="site2" database="site2" />
Line 22: </connectionGroup>
Как это исправить, чтобы web.config мог содержать несколько элементов подключения?
Раздел определяется как:
namespace Helpers
{
public class ConnectionSection : ConfigurationSection
{
[ConfigurationProperty("url", IsRequired = true, IsKey = true)]
public string Url
{
get { return (string)this["url"]; }
set { this["url"] = value; }
}
[ConfigurationProperty("database", DefaultValue = "mydb", IsRequired = false)]
public string Database
{
get { return (string)this["database"]; }
set { this["database"] = value; }
}
}
}
Ответ №1:
public class ConnectionGroupConfigurationSection : ConfigurationSection
{
public const string NodeName = "connectionGroup";
[ConfigurationProperty("", IsDefaultCollection=true)]
public ConnectionGroupConfigurationElementCollection ConnectionGroup
{
get { return (ConnectionGroupConfigurationElementCollection)this[""]; }
}
}
public class ConnectionGroupConfigurationElementCollection : ConfigurationElementCollection
{
protected override ConfigurationElement CreateNewElement()
{
return new ConnectionElement();
}
protected override object GetElementKey(ConfigurationElement element)
{
return (element as ConnectionElement).Id;
}
public override ConfigurationElementCollectionType CollectionType
{
get { return ConfigurationElementCollectionType.BasicMap; }
}
protected override string ElementName
{
get { return "connection"; }
}
}
public class ConnectionElement : ConfigurationElement
{
[ConfigurationProperty("url", IsRequired=true, IsKey=true)]
public string Url { get { return (string)this["url"]; } }
[ConfigurationProperty("database", DefaultValue = "mydb", IsRequired = false)]
public string Database { get { return (string)this["database"]; } set { this["database"] = value; } }
}
Комментарии:
1. и вызовите (WebConfigurationManager. GetSection(ConnectionGroupConfigurationSection. Имя узла) как ConnectionGroupConfigurationSection). ConnectionGroup.Cast<ConnectionElement>()