Adding Layer

How do I check to see if a layer exists in the layer table, and if not add it.

 

Why bother? The Add method _doesn't_ cause an error if the Layer object
already exists.

--
R. Robert Bell


How do I check to see if a layer exists in the layer table, and if not add
it.

 

You know, I almost answered with a nearly identical response. In most of my
own code I used to use the Add method and be done with it.

However, it has been suggested that that is a bad habit to get into, since
most other collections will puke on the Add method if the item already
exists. So I have been forcing myself to ALWAYS allow for an error being
raised by the Add method, even when I know it won't. Who knows, maybe Adesk
will "fix" the layers collection to act like all other collections in the
future.

Just my casual coder $0.01....

 

In two years we'll all be coding in C# and forget about all this anyway,
right?! ;^)

--
R. Robert Bell


You know, I almost answered with a nearly identical response. In most of my
own code I used to use the Add method and be done with it.

However, it has been suggested that that is a bad habit to get into, since
most other collections will puke on the Add method if the item already
exists. So I have been forcing myself to ALWAYS allow for an error being
raised by the Add method, even when I know it won't. Who knows, maybe Adesk
will "fix" the layers collection to act like all other collections in the
future.

Just my casual coder $0.01....

 

Do you really think it's going to take you that long to learn it?

 

No. But I was including the slugs.

--
R. Robert Bell

Do you really think it's going to take you that long to learn it?