Custom Layer not drawing using ArcObjects?

Question

I have a Customer layer which inherits BaseCustomLayer.

I add it to my MapControl via addLayer but the function public override void Draw(esriDrawPhase drawPhase, IDisplay Display, ITrackCancel trackCancel) is never hit.

The Custom Layer appears checked in the TOC.

I think I must be missing some initialization one-liner.

Answer 1

Here's a minimalist custom layer:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using ESRI.ArcGIS.ADF.BaseClasses;
using ESRI.ArcGIS.Geometry;
using ESRI.ArcGIS.Display;
using ESRI.ArcGIS.esriSystem;
namespace MapControlApplication1
{
 class CustLayer2: BaseCustomLayer
 {
 public override void Draw(esriDrawPhase drawPhase, IDisplay Display, ITrackCancel trackCancel)
 {
 System.Diagnostics.Debug.Print("drawing {0} {1}", drawPhase, Environment.TickCount);
 }
 }
}

I created a new Project and choosing C#>ArcGIS>Extending ArcObjects>Mapcontrol Application, then added a new menuitem on the menu of MainForm with this:

private void testToolStripMenuItem_Click(object sender, EventArgs e)
{
 try
 {
 CustLayer2 layer = new CustLayer2();
 layer.Name = "cust layer2";
 axMapControl1.AddLayer(layer);
 }
 catch (Exception ex)
 {
 MessageBox.Show(this, ex.Message);
 }
}

When I run I see this output as I pan around the map:

drawing esriDPGeography 441416029
drawing esriDPGeography 441422207
drawing esriDPGeography 441433579

• patrick: I had "dynamicMap.DynamicMapEnabled = true;" which was interferring with your example. Thanks for all your help.
• Kirk Kuykendall: Ahh, that makes sense. For a custom layer to draw when the dynamicmap is enabled, I think you'll need to implement IDynamicLayer too. help.arcgis.com/en/sdk/10.0/arcobjects_net/conceptualhelp/…