在winforms的PropertyGrid中裁切文本并显示三个点

public class EllipsisTextPropertyDescriptor : PropertyDescriptor
{
    private PropertyDescriptor originalPropertyDescriptor;

    public EllipsisTextPropertyDescriptor(PropertyDescriptor originalPropertyDescriptor)
        : base(originalPropertyDescriptor)
    {
        this.originalPropertyDescriptor = originalPropertyDescriptor;
    }

    public override bool CanResetValue(object component)
    {
        return originalPropertyDescriptor.CanResetValue(component);
    }

    public override Type ComponentType
    {
        get { return originalPropertyDescriptor.ComponentType; }
    }

    public override object GetValue(object component)
    {
        string originalValue = originalPropertyDescriptor.GetValue(component) as string;
        if (originalValue != null && originalValue.Length > 10)
        {
            return originalValue.Substring(0, 10) + "...";
        }
        return originalValue;
    }

    public override bool IsReadOnly
    {
        get { return originalPropertyDescriptor.IsReadOnly; }
    }

    public override Type PropertyType
    {
        get { return originalPropertyDescriptor.PropertyType; }
    }

    public override void ResetValue(object component)
    {
        originalPropertyDescriptor.ResetValue(component);
    }

    public override void SetValue(object component, object value)
    {
        originalPropertyDescriptor.SetValue(component, value);
    }

    public override bool ShouldSerializeValue(object component)
    {
        return originalPropertyDescriptor.ShouldSerializeValue(component);
    }
}

public partial class Form1 : Form
{
    private MySettings settings;

    public Form1()
    {
        InitializeComponent();
        settings = new MySettings();
        propertyGrid1.SelectedObject = settings;
    }
}

public class MySettings
{
    [Category("General")]
    [Description("The name of the item.")]
    [DisplayName("Item Name")]
    [TypeConverter(typeof(EllipsisTextConverter))]
    public string ItemName { get; set; }
}

public class EllipsisTextConverter : TypeConverter
{
    public override PropertyDescriptorCollection GetProperties(ITypeDescriptorContext context, object value, Attribute[] attributes)
    {
        PropertyDescriptorCollection properties = TypeDescriptor.GetProperties(value, attributes);
        PropertyDescriptorCollection newProperties = new PropertyDescriptorCollection(null);

        foreach (PropertyDescriptor property in properties)
        {
            if (property.PropertyType == typeof(string))
            {
                newProperties.Add(new EllipsisTextPropertyDescriptor(property));
            }
            else
            {
                newProperties.Add(property);
            }
        }

        return newProperties;
    }
}