XElementValuePropertyDescriptor.cs

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using System;
using System.Xml.Linq;
 
namespace MS.Internal.Xml.Linq.ComponentModel;
 
internal sealed class XElementValuePropertyDescriptor : XPropertyDescriptor<XElement, string>
{
    private XElement _element;
 
    public override bool IsReadOnly => false;
 
    public XElementValuePropertyDescriptor()
        : base("Value")
    {
    }
 
    public override object GetValue(object component)
    {
        _element = component as XElement;
        if (_element == null)
        {
            return string.Empty;
        }
        return _element.Value;
    }
 
    public override void SetValue(object component, object value)
    {
        _element = component as XElement;
        if (_element != null)
        {
            _element.Value = value as string;
        }
    }
 
    protected override void OnChanged(object sender, XObjectChangeEventArgs args)
    {
        if (_element == null)
        {
            return;
        }
        switch (args.ObjectChange)
        {
        case XObjectChange.Add:
        case XObjectChange.Remove:
            if (sender is XElement || sender is XText)
            {
                OnValueChanged(_element, EventArgs.Empty);
            }
            break;
        case XObjectChange.Value:
            if (sender is XText)
            {
                OnValueChanged(_element, EventArgs.Empty);
            }
            break;
        }
    }
}