Multi-line string in a PropertyGrid

Question

Is there a built-in editor for a multi-line string in a PropertyGrid.

Answer 1

We need to write our custom editor to get the multiline support in property grid.

Here is the customer text editor class implemented from UITypeEditor

public class MultiLineTextEditor : UITypeEditor
{
    private IWindowsFormsEditorService _editorService;

    public override UITypeEditorEditStyle GetEditStyle(ITypeDescriptorContext context)
    {
        return UITypeEditorEditStyle.DropDown;
    }

    public override object EditValue(ITypeDescriptorContext context, IServiceProvider provider, object value)
    {
        _editorService = (IWindowsFormsEditorService)provider.GetService(typeof(IWindowsFormsEditorService));

        TextBox textEditorBox = new TextBox();
        textEditorBox.Multiline = true;
        textEditorBox.ScrollBars = ScrollBars.Vertical;
        textEditorBox.Width = 250;
        textEditorBox.Height = 150;
        textEditorBox.BorderStyle = BorderStyle.None;
        textEditorBox.AcceptsReturn = true;
        textEditorBox.Text = value as string;

        _editorService.DropDownControl(textEditorBox);

        return textEditorBox.Text;
    }
}

Write your custom property grid and apply this Editor attribute to the property

class CustomPropertyGrid
{
    private string multiLineStr = string.Empty;

    [Editor(typeof(MultiLineTextEditor), typeof(UITypeEditor))]
    public string MultiLineStr
    {
        get { return multiLineStr; }
        set { multiLineStr = value; }
    }
}

In main form assign this object

 propertyGrid1.SelectedObject = new CustomPropertyGrid();