CollectionEditor error if collection has null items-CodePudding

If my array property has null items, then I can't open CollectionEditor from PropertyGrid. I get error with text 'component'. How can I fix it?

    public partial class Form1 : Form
    {
        public Test[] test { get; set; }

        public Form1()
        {
            InitializeComponent();

            test = new Test[5];
            test[2] = new Test() { Name = "2" };

            propertyGrid1.SelectedObject = this;
        }
    }

    [TypeConverter(typeof(ExpandableObjectConverter))]
    public class Test
    {
        public string Name { get; set; }
    }

Maybe I should override some methods in my custom CollectionEditor, but i don't know which

CodePudding user response：

It depends exactly how you want to work around this, but if you just need to exclude the null values, then you can override the default ArrayEditor class, something like this;

// define the editor on the property
[Editor(typeof(MyArrayEditor), typeof(UITypeEditor))]
public Test[] test { get; set; }

...

public class MyArrayEditor : ArrayEditor
{
    public MyArrayEditor(Type type) : base(type)
    {
    }

    protected override object[] GetItems(object editValue)
    {
        // filter on the objects you want the array editor to use
        return base.GetItems(editValue).Where(i => i != null).ToArray();
    }
}