如何手动从app.config文件中读取强类型对象

时间:2009-02-10 14:23:13

标签: .net app-config strong-typing

我有一个dll,我想从手动指定的app.config文件中读取(dll是本机com的所有.net扩展,是Microsoft管理控制台的快照,所以没有mmc.exe。配置)。我已经能够打开配置文件,阅读相关的组和部分以获得我想要的设置。像这样:

ExeConfigurationFileMap fileMap = new ExeConfigurationFileMap();
            fileMap.ExeConfigFilename = Assembly.GetExecutingAssembly().Location + ".config"; 
            Configuration config = ConfigurationManager.OpenMappedExeConfiguration(fileMap, ConfigurationUserLevel.None);
            ShowSectionGroupCollectionInfo(config.SectionGroups);
            ConfigurationSectionGroup group = config.SectionGroups["applicationSettings"];
            ClientSettingsSection section = group.Sections["Namespace.Properties.Settings"] as ClientSettingsSection;
            SettingElement sectionElement = section.Settings.Get("AllowedPlugins");

            SettingValueElement elementValue = sectionElement.Value;

设置是字符串集合和字符串。像这样:

<applicationSettings>
    <Namespace.Properties.Settings>
        <setting name="AllowedPlugins" serializeAs="Xml">
            <value>
                <ArrayOfString xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
                    xmlns:xsd="http://www.w3.org/2001/XMLSchema">
                    <string>Plugin1.Name</string>
                    <string>Plugin2.Name</string>
                    <string>Plugin3.Name</string>
                </ArrayOfString>
            </value>
        </setting>
        <setting name="blah" serializeAs="String">
            <value>sajksjaksj</value>
        </setting>
    </Namespace.Properties.Settings>
</applicationSettings>

我可以用一点kak的方式创建一个字符串数组:

List<String> values = new List<string>(elementValue.ValueXml.InnerText.Split(new string[]{" ",Environment.NewLine}, StringSplitOptions.RemoveEmptyEntries ));

但我想知道是否有一种很好的方法,我错过了我可以将我的设置读取并转换为正确类型的对象,就像读取标准app.config文件时一样

请告诉我有......

2 个答案:

答案 0 :(得分:6)

我过去做过这种方式的方法是使用自定义配置部分并为该部分实现IConfigurationSectionHandler。您仍然必须在配置部分处理程序中执行所有解析,但是这样可以轻松地在您的应用程序中以您希望的形式获取配置部分中的信息。 MSDN上有一个How To article,它经历了创建这样一个处理程序的过程。

下面是我使用过的一个例子:

用法:

Dictionary<string,AdministrativeRole> roles
        = ConfigurationManager.GetSection("roles")
             as Dictionary<string,AdministrativeRole>;

的web.config:

<configuration>
   <configSections>
      <section name="roles"
               type="com.example.RolesDefinitionHandler, com.example" />
   </configSections>
   <roles>
       <role name="Administrator" group="domain\group-name" />
       ...
   </roles>
</configuration>

代码:

public class RolesDefinitionHandler : IConfigurationSectionHandler
{
    private static readonly string ROLE_SECTION_NAME = "role";
    private static readonly string ROLE_SECTION_NAME_ATTRIBUTE = "name";
    private static readonly string ROLE_SECTION_GROUP_ATTRIBUTE = "group";

    private Dictionary<string, AdministrativeRole> ReadConfiguration( XmlNode section )
    {
        Dictionary<string, AdministrativeRole> roles = new Dictionary<string, AdministrativeRole>();
        foreach (XmlNode node in section.ChildNodes)
        {
            if (node.Name.Equals( ROLE_SECTION_NAME, StringComparison.InvariantCultureIgnoreCase ))
            {
                string name = (node.Attributes[ROLE_SECTION_NAME_ATTRIBUTE] != null) ? node.Attributes[ROLE_SECTION_NAME_ATTRIBUTE].Value.ToLower() : null;
                if (string.IsNullOrEmpty( name ))
                {
                    throw new ConfigurationErrorsException( "missing required attribute " + ROLE_SECTION_NAME_ATTRIBUTE );
                }

                string group = (node.Attributes[ROLE_SECTION_GROUP_ATTRIBUTE] != null) ? node.Attributes[ROLE_SECTION_GROUP_ATTRIBUTE].Value.ToLower() : null;
                if (string.IsNullOrEmpty( group ))
                {
                    throw new ConfigurationErrorsException( "missing required attribute " + ROLE_SECTION_GROUP_ATTRIBUTE );
                }

                if (roles.ContainsKey( name ))
                {
                    throw new ConfigurationErrorsException( "duplicate " + ROLE_SECTION_NAME + " for " + name );
                }

                roles.Add( name, new AdministrativeRole( name, group ) );
            }
            else
            {
                throw new ConfigurationErrorsException( "illegal node " + node.Name );
            }
        }

        return roles;
    }

    #region IConfigurationSectionHandler Members

    public object Create( object parent, object configContext, System.Xml.XmlNode section )
    {
        return ReadConfiguration( section );
    }

    #endregion
}

答案 1 :(得分:1)

可能是一个更好的解决方案,类似于将sql连接字符串添加到app.config中的方式:

http://msdn.microsoft.com/en-us/library/system.configuration.configurationcollectionattribute.aspx