/// <summary>Constructs a new instance of <see cref="DefaultWebConfiguration"/> that sets the <see cref="AppSettings"/> and <see cref="ConnectionStrings"/> collection properties to immutable snapshot copies of <see cref="WebConfigurationManager"/>'s respective static collection properties.</summary>
public DefaultWebConfiguration()
{
this.AppSettings = AndiExtensions.ToDictionary(WebConfigurationManager.AppSettings);
this.ConnectionStrings = WebConfigurationManager.ConnectionStrings
.OfType <ConnectionStringSettings>()
.ToDictionary(cs => cs.Name, comparer: StringComparer.OrdinalIgnoreCase);
}
/// <summary>Returns an <see cref="IReadOnlyDictionary{String,String}"/> representation of a .NET configuration section provided by either <see cref="DictionarySectionHandler"/>, <see cref="NameValueSectionHandler"/>, <see cref="NameValueFileSectionHandler"/> or <see cref="SingleTagSectionHandler"/> (or any configuration section that is resolvable to <see cref="System.Collections.IDictionary"/> or <see cref="NameValueCollection"/>). Returns <c>null</c> if the section does not exist.</summary>
/// <remarks>Unlike the <see cref="AppSettings"/> and <see cref="ConnectionStrings"/> properties of <see cref="DefaultWebConfiguration"/> values are not eagerly-loaded inside <see cref="DefaultWebConfiguration"/>'s constructor.</remarks>
public IReadOnlyDictionary <String, String> GetKeyValueSection(String sectionName)
{
if (String.IsNullOrWhiteSpace(sectionName))
{
throw new ArgumentNullException(nameof(sectionName));
}
//
Object sectionObj = WebConfigurationManager.GetSection(sectionName);
if (sectionObj is null)
{
return(null);
}
if (sectionObj is IReadOnlyDictionary <String, String> rodict)
{
return(rodict);
}
else if (sectionObj is System.Collections.Hashtable hashtable)
{
return(hashtable.Keys
.Cast <Object>()
.Select(keyObj => (key: keyObj as String, value: hashtable[keyObj] as String))
.Where(t => t.key != null)
.ToDictionary(t => t.key, t => t.value, comparer: StringComparer.OrdinalIgnoreCase));
}
else if (sectionObj is System.Collections.IDictionary dict)
{
return(dict.Keys
.Cast <Object>()
.Select(keyObj => (key: keyObj as String, value: dict[keyObj] as String))
.Where(t => t.key != null)
.ToDictionary(t => t.key, t => t.value, comparer: StringComparer.OrdinalIgnoreCase));
}
else if (sectionObj is NameValueCollection nvc)
{
return(AndiExtensions.ToDictionary(nvc));
}
else
{
throw new InvalidOperationException("The configuration section named \"" + sectionName + "\" is of type " + sectionObj.GetType().FullName + " and cannot be converted to an " + nameof(IReadOnlyDictionary <String, String>) + ".");
}
}