使用PropertyChanged事件创建自定义ConfigurationElement

public class CustomConfigurationElement : ConfigurationElement
{
    [ConfigurationProperty("propertyName", DefaultValue = "default value", IsRequired = true)]
    public string PropertyName
    {
        get { return (string)this["propertyName"]; }
        set { this["propertyName"] = value; }
    }
}

public class CustomConfigurationElement : ConfigurationElement
{
    // ...

    public event PropertyChangedEventHandler PropertyChanged;

    protected virtual void OnPropertyChanged(string propertyName)
    {
        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
    }
}

public class CustomConfigurationElement : ConfigurationElement
{
    // ...

    protected override bool OnDeserializeUnrecognizedAttribute(string name, string value)
    {
        bool result = base.OnDeserializeUnrecognizedAttribute(name, value);

        // Trigger the PropertyChanged event
        OnPropertyChanged(name);

        return result;
    }
}

CustomConfigurationElement customElement = ConfigurationManager.GetSection("customSection") as CustomConfigurationElement;
customElement.PropertyChanged += (sender, e) =>
{
    // Handle the property change event
    Console.WriteLine($"Property '{e.PropertyName}' changed to '{customElement.PropertyName}'");
};