Functions

To expose C# methods to Unreal Engine, whether for Blueprint calls or Blueprint overrides. You must apply the [UFunction] attribute.

Blueprint-Callable Functions

Use BlueprintCallable (or other call-related flags like BlueprintPure, etc.) to allow Blueprint graphs to invoke your C# method.

// Can be called from BP
[UFunction(FunctionFlags.BlueprintCallable)]
public void MyBPCallableFunction(IList<int> myList)
{
    
}

Notes:

• Accepts normal managed types (int, float, IList<T>, etc.) as long as they can be marshalled.

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Blueprint-Overridable Functions (Events)

To allow Blueprint subclasses to override a C# function, UnrealSharp uses a partial method pair:

• A declaration marked with BlueprintEvent.

• An automatically-generated *_Implementation method stub you can override on the C# side.

// Declares a function that Blueprint subclasses may override.
[UFunction(FunctionFlags.BlueprintEvent)]
public partial void MyBPOverridableFunction(IList<int> myList);

// The default implementation on the C# side.
public partial void MyBPOverridableFunction_Implementation(IList<int> myList)
{
    // Default behavior
}