C# make runscript error on purpose

Grasshopper Developer
1

Hi,

Not in visual studio but in c sharp editor in grasshopper, I would like to make error on purpose.

Let say

if(i = 0)
ComponentBecomeRed and display a message

How can I make this?

2

Assigned to Grasshopper category

3

Instead of red I would suggest:

try{ some stupid thing }
catch{ Print(“Stupid thing did stupid things”);}

That way you can “trace” N errors

4

Like this:
for Warning (yellow/orange)

this.Component.AddRuntimeMessage(GH_RuntimeMessageLevel.Warning, “Warning message.”);

or for Error (red)

this.Component.AddRuntimeMessage(GH_RuntimeMessageLevel.Error, “Error message.”);

You might want to put

return;

after an error to stop the script.

2 Likes
5

In addition to @Michael_Pryor and @PeterFotiadis suggestions, any exception thrown inside the script will be caught and put into the RuntimeMessage list as an error. So

throw new Exception("You're not allowed to divide by zero.");

would both immediately stop the execution of your script and log an error.

3 Likes
6

this.Component gave me an error
I used this.AddRuntimeMessage() directly like this:

            this.AddRuntimeMessage(GH_RuntimeMessageLevel.Warning, "Warning message.");
7

If you’re using VS to compile your code, then your code is already inside a Component class. For C# scripts however that is not the case. In scripts you have to access the Component field to get that functionality.

8

that makes sense! thankyou so much.

9

in VS you won’t even need the “this.”

10

wow cool. thanks

11

Hi, quick question on this topic. If try and catch is added to a static method, is it still possible to add a runtime message? Apparently, Component is non-static and does not allow it. It could be useful to find a workaround. Thanks