/
NameValueSectionHandler.cs
100 lines (81 loc) · 3.28 KB
/
NameValueSectionHandler.cs
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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
using System.Xml;
namespace System.Configuration
{
/// <summary>
/// Simple dictionary config factory
/// </summary>
public class NameValueSectionHandler : IConfigurationSectionHandler
{
private const string DefaultKeyAttribute = "key";
private const string DefaultValueAttribute = "value";
public object Create(object parent, object context, XmlNode section)
{
return CreateStatic(parent, section, KeyAttributeName, ValueAttributeName);
}
internal static object CreateStatic(object parent, XmlNode section)
{
return CreateStatic(parent, section, DefaultKeyAttribute, DefaultValueAttribute);
}
internal static object CreateStatic(object parent, XmlNode section, string keyAttriuteName, string valueAttributeName)
{
ReadOnlyNameValueCollection result;
// start result off as a shallow clone of the parent
if (parent == null)
result = new ReadOnlyNameValueCollection(StringComparer.OrdinalIgnoreCase);
else
{
ReadOnlyNameValueCollection parentCollection = (ReadOnlyNameValueCollection)parent;
result = new ReadOnlyNameValueCollection(parentCollection);
}
// process XML
HandlerBase.CheckForUnrecognizedAttributes(section);
foreach (XmlNode child in section.ChildNodes)
{
// skip whitespace and comments
if (HandlerBase.IsIgnorableAlsoCheckForNonElement(child))
continue;
// handle <set>, <remove>, <clear> tags
if (child.Name == "add")
{
string key = HandlerBase.RemoveRequiredAttribute(child, keyAttriuteName);
string value = HandlerBase.RemoveRequiredAttribute(child, valueAttributeName, true/*allowEmptyString*/);
HandlerBase.CheckForUnrecognizedAttributes(child);
result[key] = value;
}
else if (child.Name == "remove")
{
string key = HandlerBase.RemoveRequiredAttribute(child, keyAttriuteName);
HandlerBase.CheckForUnrecognizedAttributes(child);
result.Remove(key);
}
else if (child.Name.Equals("clear"))
{
HandlerBase.CheckForUnrecognizedAttributes(child);
result.Clear();
}
else
{
HandlerBase.ThrowUnrecognizedElement(child);
}
}
result.SetReadOnly();
return result;
}
/// <summary>
/// <para>[To be supplied.]</para>
/// </summary>
protected virtual string KeyAttributeName
{
get { return DefaultKeyAttribute; }
}
/// <summary>
/// <para>[To be supplied.]</para>
/// </summary>
protected virtual string ValueAttributeName
{
get { return DefaultValueAttribute; }
}
}
}