ArcGIS Engine Developer Guide

BUILDING APPLICATIONS WITH WINDOWS CONTROLS
// Set the element's geometry.
element.Geometry = point;
Setting the Register for COM Interop property
to True will invoke the Assembly Registration
Tool (Regasm.exe). This will add the information
about the class to the registry that a COM
client would expect to find.
If the Register for COM Interop property is
disabled, check that the project is a C# class
library type.
A new GUID can be generated by using the
GuidGen.exe utility included with Visual Studio
.NET or by selecting Create GUID from the
Tools menu. The GUID should be specified in the
format shown, without curly brackets.
// Add the element to the graphics container.
activeView.GraphicsContainer.AddElement(element, 0);
// Refresh the graphics.
activeView.PartialRefresh(esriViewDrawPhase.esriViewGraphics, null,
null);
}
19. ArcGIS Engine expects the custom command to be a COM class; therefore
you must specify that the .NET class you have created is also exposed as a
COM class by creating a COM callable wrapper for it. In the Solution Explorer
window, right-click the Commands project and select Properties from
the context menu.
20. In the project Property Pages dialog box, select Configuration Properties,
then click Build. In the right pane, change the Register for COM Interop
property to True. Click OK.
21. In the code window of the AddDateTool class add the following code to the
beginning of the AddDateTool class declaration to specify attributes required
by COM.
[ClassInterface(ClassInterfaceType.None)]
[Guid("D880184E-AC81-47E5-B363-781F4DC4528F")]
22. Add the following code to the AddDateTool class after the member variables.
The code defines functions that register and unregister the AddDateTool class
to the ESRI Controls Commands component category using the categories
utility.
// Register in the 'ESRI Controls Commands' component category.
#region Component Category Registration
[ComRegisterFunction()]
[ComVisible(false)]
static void RegisterFunction(String sKey)
{
string fullKey = sKey.Remove(0, 18) + @"\Implemented Categories";
Microsoft.Win32.RegistryKey regKey =
Microsoft.Win32.Registry.ClassesRoot.OpenSubKey(fullKey, true);
if (regKey != null)
{
regKey.CreateSubKey("{B284D891-22EE-4F12-A0A9-
B1DDED9197F4}");
}
}
[ComUnregisterFunction()]
[ComVisible(false)]
static void UnregisterFunction(String sKey)
{
string fullKey = sKey.Remove(0, 18) + @"\Implemented Categories";
Microsoft.Win32.RegistryKey regKey =
Microsoft.Win32.Registry.ClassesRoot.OpenSubKey(fullKey, true);
if (regKey != null)
350 • ArcGIS Engine Developer Guide