New class and method

A new door behavior needs a home before it needs nodes. Start with the type, then give it one small method.

The problem

Creating a C# file by hand asks for several decisions at once: folder, namespace, type kind, access, parent, method name, return type, and parameters. A typo in any one can leave the project compiling badly.

When to reach for it

Use Assets > Round Trip > New Class when no suitable type owns the behavior. The + beside the class chip at the top of the Round Trip Graphs window opens the same choices in place. Use Assets > Round Trip > New Method, or the + on the Methods section header, when the class exists and needs a new operation. Both flows validate identifiers and types before the declaration reaches source.

See it

Figure 1. The class name, location, kind, access, and parent choices.

Figure 2. The method name, return type, and parameter rows.

Do it

1. Select the target folder in Unity’s Project window and choose Assets > Round Trip > New Class, or press the + beside the class chip in the Round Trip Graphs window.
2. In NAME, enter a Pascal-cased C# identifier. The field shows a local reason for empty, invalid, reserved, or colliding names.
3. In LOCATION, choose a registered source folder. The namespace and resolved path follow that location. In the window’s create dialog, New Folder… makes a folder that does not exist yet.
4. Choose class, struct, interface, or enum, then choose public or internal access.
5. In PARENT CLASS, pick (none) or a base card. MonoBehaviour and ScriptableObject are always offered, whichever bases the project already uses. In the window’s create dialog, OR BROWSE ALL CLASSES lists every indexed class as another base. An enum has no parent, so it disables the parent choices.
6. Create the draft, select the new type, and choose Assets > Round Trip > New Method. In the Graphs window you can press the + on the Methods section header instead: it adds a void method named NewMethod (or the next free name), opens its preview graph, and puts a name box on its row. Type the name and press Enter, or press Escape to keep the default. The box stays open while the preview graph loads.
7. Enter the method name and return type. Under parameters, choose add parameter for each type and name pair.
8. Choose create to open the preview graph, or cancel to leave without a draft.
9. Add behavior to the preview graph. No class or method source is written while you are still arranging the draft.
10. Press Compile. The declarations and body are written, Unity imports the file, and the parsed method graph replaces the preview.

You should see

The new class appears in its chosen folder and namespace. Its method appears in the Explorer with the return and parameter shape you previewed.

Change one thing

Draft a CoinReporter class with a Report(int count) method. Add one call to its preview graph, then undo the call before Compile to see that the file still does not exist in source.

What it writes

C#

What it writes

C#

using UnityEngine;

namespace RoundTrip.Platformer.Runtime
{
    public class CoinReporter : MonoBehaviour
    {
        public void Report(int count)
        {
            Debug.Log(count);
        }
    }
}

The parent you chose brings its using with it. Any type name Compile writes in full, such as UnityEngine.Debug, is shortened and its namespace imported wherever that cannot make a name in the file ambiguous.

When it goes wrong

When it goes wrong

Symptom	Check	Fix
Create stays blocked	Read the name callout and resolved path.	Use a valid, unused C# identifier and an existing registered folder.
A parameter is rejected	Check its type expression and name.	Use a valid C# type, a unique identifier, and never void as a parameter type.
The preview has no source location	Confirm the method is still a draft.	Finish the graph and press Compile to create its source span.

Next

• Fields and defaults
• Lifecycle methods
• Preview and Compile