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GeneralRe: How to set null value to a FOREIGN KEY using EF Core Pin
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AnswerRe: How to set null value to a FOREIGN KEY using EF Core Pin
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QuestionControlDesigner issue Pin
mo149230-Jul-22 0:51
mo149230-Jul-22 0:51 
Not sure if this is the correct group for this question but I am working with C#.
I'm migrating from VS2005 to VS2022 and having problem with ControlDesigner in my Control. It seems that the ControlDesigner is not functioning. I'm not too familiar with ControlDesigner programming so after working on this for a while I decided to start from scratch. I found an example in Microsoft Help Viewer for ControlDesigner. I copied and pasted the example code into a project UserControl1 and it too does not seem to function. When moving the mouse over the control the outline does not highlight and also the OutlineColor property is not shown in the Properties window.
Can someone help? Below is the sample code from Help Viewer. The only difference the test control is called UserControl1
Thank you.

C#
using System.ComponentModel;

namespace TestApp
{
    // ExampleControlDesigner is an example control designer that 
    // demonstrates basic functions of a ControlDesigner. 
    public class ExampleControlDesigner : System.Windows.Forms.Design.ControlDesigner
    {
        // This Boolean state reflects whether the mouse is over the control.
        private bool mouseover = false;
        // This color is a private field for the OutlineColor property.
        private Color lineColor = Color.White;

        // This color is used to outline the control when the mouse is 
        // over the control.
        public Color OutlineColor
        {
            get
            {
                return lineColor;
            }
            set
            {
                lineColor = value;
            }
        }

        public ExampleControlDesigner()
        {
        }

        // Sets a value and refreshes the control's display when the 
        // mouse position enters the area of the control.
        protected override void OnMouseEnter()
        {
            this.mouseover = true;
            this.Control.Refresh();
        }

        // Sets a value and refreshes the control's display when the 
        // mouse position enters the area of the control.        
        protected override void OnMouseLeave()
        {
            this.mouseover = false;
            this.Control.Refresh();
        }

        // Draws an outline around the control when the mouse is 
        // over the control.    
        protected override void OnPaintAdornments(System.Windows.Forms.PaintEventArgs pe)
        {
            if (this.mouseover)
            {
                pe.Graphics.DrawRectangle(
                    new Pen(new SolidBrush(this.lineColor), 6),
                    0,
                    0,
                    this.Control.Size.Width,
                    this.Control.Size.Height);
            }
        }

        // Adds a property to this designer's control at design time 
        // that indicates the outline color to use. 
        // The DesignOnlyAttribute ensures that the OutlineColor
        // property is not serialized by the designer.
        protected override void PreFilterProperties(System.Collections.IDictionary properties)
        {
            PropertyDescriptor pd = TypeDescriptor.CreateProperty(
                typeof(ExampleControlDesigner),
                "OutlineColor",
                typeof(System.Drawing.Color),
                new Attribute[] { new DesignOnlyAttribute(true) });

            properties.Add("OutlineColor", pd);
        }
    }

    // This example control demonstrates the ExampleControlDesigner.
    [DesignerAttribute(typeof(ExampleControlDesigner))]
    public partial class UserControl1 : UserControl
    {
        public UserControl1()
        {
            InitializeComponent();
        }
    }
}

Frown | :(

modified 30-Jul-22 7:42am.

AnswerRe: ControlDesigner issue Pin
Gerry Schmitz30-Jul-22 5:04
mveGerry Schmitz30-Jul-22 5:04 
GeneralRe: ControlDesigner issue Pin
mo149230-Jul-22 7:35
mo149230-Jul-22 7:35 
GeneralRe: ControlDesigner issue Pin
Gerry Schmitz30-Jul-22 14:49
mveGerry Schmitz30-Jul-22 14:49 
GeneralRe: ControlDesigner issue Pin
mo149231-Jul-22 6:43
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