Well, my first disclaimer is that my code is written in VB.Net not C#.Net, but the object relationship is the same. I don't know what you understand about the language, so I'm simply going to stick to the facts about the RevitAPI.dll.
If you have an element ID, then you ask revit for the element. To do this you need the document object. This is given to you by the command's event arguments typically called "commandData" you declare a variable "doc" as type Autodesk.Revit.Document and set it = commandData.Application.ActiveDocument
Now that you have the document, you need to get the element from it. Very simple declare "myElement" as Autodesk.Revit.Element = Doc.Element(elementID)... Ok not that simple, you have to turn your number 156789 into an elementID type variable, so if you don't already have the elementID type variable declaired you need to do that first. It is not that hard declare "myID" as new ElementID, then set myID.value = 156789.
Now you have a populated variable myElement that is the element using your elementID found in the active document. Next you want to change the parameter "Comments" to your favorite text. VERY Simple. myElement.Parameter("Comments").set("this is a door"). Bear in mind that the parameter name must be exact to work at all, that includes case sensitivity. There are other, more reliable ways, to do this, but you needed the ez route.
That's it, now trust Revit to perform the action when you finish your command (function), Return.IExternalCommand.Result.Succeeded
When you return result succeeded, revit will take your command, commit the changes, run it's own error control and attempt to perform all the actions you programmed.
jvj
ps, find and install RvtMgdDbg.dll. This will give you a good view up the skirt of RevitAPI.dll
Edited by: JamieVJohnson on Mar 12, 2010 9:50 PM
