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C# API differences to GDScript

This is a (incomplete) list of API differences between C# and GDScript.

General differences

As explained in the C# basics, C# generally uses PascalCase instead of the snake_case used in GDScript and C++.

Global scope

Global functions and some constants had to be moved to classes, since C# does not allow declaring them in namespaces. Most global constants were moved to their own enums.

Constants

In C#, only primitive types can be constant. For example, the TAU constant is replaced by the Mathf.Tau constant, but the Vector2.RIGHT constant is replaced by the Vector2.Right read-only property. This behaves similarly to a constant, but can't be used in some contexts like switch statements.

Global enum constants were moved to their own enums. For example, ERR_* constants were moved to the Error enum.

Special cases:

GDScript	C#
TYPE_*	Variant.Type enum
OP_*	Variant.Operator enum

Math functions

Math global functions, like abs, acos, asin, atan and atan2, are located under Mathf as Abs, Acos, Asin, Atan and Atan2. The PI constant can be found as Mathf.Pi.

C# also provides static System.Math and System.MathF classes that may contain other useful mathematical operations.

Random functions

Random global functions, like rand_range and rand_seed, are located under GD. Example: GD.RandRange and GD.RandSeed.

Consider using System.Random or, if you need cryptographically strong randomness, System.Security.Cryptography.RandomNumberGenerator.

Other functions

Many other global functions like print and var_to_str are located under GD. Example: GD.Print and GD.VarToStr.

Exceptions:

GDScript	C#
weakref(obj)	GodotObject.WeakRef(obj)
instance_from_id(id)	GodotObject.InstanceFromId(id)
is_instance_id_valid(id)	GodotObject.IsInstanceIdValid(id)
is_instance_valid(obj)	GodotObject.IsInstanceValid(obj)

Tips

Sometimes it can be useful to use the using static directive. This directive allows to access the members and nested types of a class without specifying the class name.

Example:

using static Godot.GD;

public class Test
{
    static Test()
    {
        Print("Hello"); // Instead of GD.Print("Hello");
    }
}

Full list of equivalences

List of Godot's global scope functions and their equivalent in C#:

GDScript	C#
abs	Mathf.Abs
absf	Mathf.Abs
absi	Mathf.Abs
acos	Mathf.Acos
asin	Mathf.Asin
atan	Mathf.Atan
atan2	Mathf.Atan2
bezier_derivative	Mathf.BezierDerivative
bezier_interpolate	Mathf.BezierInterpolate
bytes_to_var	GD.BytesToVar
bytes_to_var_with_objects	GD.BytesToVarWithObjects
ceil	Mathf.Ceil
ceilf	Mathf.Ceil
ceili	Mathf.CeilToInt
clamp	Mathf.Clamp
clampf	Mathf.Clamp
clampi	Mathf.Clamp
cos	Mathf.Cos
cosh	Mathf.Cosh
cubic_interpolate	Mathf.CubicInterpolate
cubic_interpoalte_angle	Mathf.CubicInterpolateAngle
cubic_interpolate_angle_in_time	Mathf.CubicInterpolateInTime
cubic_interpolate_in_time	Mathf.CubicInterpolateAngleInTime
db_to_linear	Mathf.DbToLinear
deg_to_rad	Mathf.DegToRad
ease	Mathf.Ease
error_string	Error.ToString
exp	Mathf.Exp
floor	Mathf.Floor
floorf	Mathf.Floor
floori	Mathf.FloorToInt
fmod	operator %
fposmod	Mathf.PosMod
hash	GD.Hash
instance_from_id	GodotObject.InstanceFromId
inverse_lerp	Mathf.InverseLerp
is_equal_approx	Mathf.IsEqualApprox
is_finite	Mathf.IsFinite or float.IsFinite or double.IsFinite
is_inf	Mathf.IsInf or float.IsInfinity or double.IsInfinity
is_instance_id_valid	GodotObject.IsInstanceIdValid
is_instance_valid	GodotObject.IsInstanceValid
is_nan	Mathf.IsNaN or float.IsNaN or double.IsNaN
is_same	operator == or object.ReferenceEquals
is_zero_approx	Mathf.IsZeroApprox
lerp	Mathf.Lerp
lerp_angle	Mathf.LerpAngle
lerpf	Mathf.Lerp
linear_to_db	Mathf.LinearToDb
log	Mathf.Log
max	Mathf.Max
maxf	Mathf.Max
maxi	Mathf.Max
min	Mathf.Min
minf	Mathf.Min
mini	Mathf.Min
move_toward	Mathf.MoveToward
nearest_po2	Mathf.NearestPo2
pingpong	Mathf.PingPong
posmod	Mathf.PosMod
pow	Mathf.Pow
print	GD.Print
print_rich	GD.PrintRich
print_verbose	Use OS.IsStdoutVerbose and GD.Print
printerr	GD.PrintErr
printraw	GD.PrintRaw
prints	GD.PrintS
printt	GD.PrintT
push_error	GD.PushError
push_warning	GD.PushWarning
rad_to_deg	Mathf.RadToDeg
rand_from_seed	GD.RandFromSeed
randf	GD.Randf
randf_range	GD.RandRange
randfn	GD.Randfn
randi	GD.Randi
randi_range	GD.RandRange
randomize	GD.Randomize
remap	Mathf.Remap
rid_allocate_id	N/A
rid_from_int64	N/A
round	Mathf.Round
roundf	Mathf.Round
roundi	Mathf.RoundToInt
seed	GD.Seed
sign	Mathf.Sign
signf	Mathf.Sign
signi	Mathf.Sign
sin	Mathf.Sin
sinh	Mathf.Sinh
smoothstep	Mathf.SmoothStep
snapped	Mathf.Snapped
snappedf	Mathf.Snapped
snappedi	Mathf.Snapped
sqrt	Mathf.Sqrt
step_decimals	Mathf.StepDecimals
str	Use $ string interpolation
str_to_var	GD.StrToVar
tan	Mathf.Tan
tanh	Mathf.Tanh
typeof	Variant.VariantType
var_to_bytes	GD.VarToBytes
var_to_bytes_with_objects	GD.VarToBytesWithObjects
var_to_str	GD.VarToStr
weakref	GodotObject.WeakRef
wrap	Mathf.Wrap
wrapf	Mathf.Wrap
wrapi	Mathf.Wrap

List of GDScript utility functions and their equivalent in C#:

GDScript	C#
assert	System.Diagnostics.Debug.Assert
char	Use explicit conversion: (char)65
convert	GD.Convert
dict_to_inst	N/A
get_stack	System.Environment.StackTrace
inst_to_dict	N/A
len	N/A
load	GD.Load
preload	N/A
print_debug	N/A
print_stack	GD.Print(System.Environment.StackTrace)
range	GD.Range or System.Linq.Enumerable.Range
type_exists	ClassDB.ClassExists(type)

preload, as it works in GDScript, is not available in C#. Use GD.Load or ResourceLoader.Load instead.

@export annotation

Use the [Export] attribute instead of the GDScript @export annotation. This attribute can also be provided with optional PropertyHint and hintString parameters. Default values can be set by assigning a value.

Example:

using Godot;

public partial class MyNode : Node
{
    [Export]
    private NodePath _nodePath;

    [Export]
    private string _name = "default";

    [Export(PropertyHint.Range, "0,100000,1000,or_greater")]
    private int _income;

    [Export(PropertyHint.File, "*.png,*.jpg")]
    private string _icon;
}

See also: C# exports.

signal keyword

Use the [Signal] attribute to declare a signal instead of the GDScript signal keyword. This attribute should be used on a delegate, whose name signature will be used to define the signal. The delegate must have the EventHandler suffix, an event will be generated in the class with the same name but without the suffix, use that event's name with EmitSignal.

[Signal]
delegate void MySignalEventHandler(string willSendAString);

See also: C# signals.

@onready annotation

GDScript has the ability to defer the initialization of a member variable until the ready function is called with @onready (cf. @onready annotation). For example:

@onready var my_label = get_node("MyLabel")

However C# does not have this ability. To achieve the same effect you need to do this.

private Label _myLabel;

public override void _Ready()
{
    _myLabel = GetNode<Label>("MyLabel");
}

Singletons

Singletons are available as static classes rather than using the singleton pattern. This is to make code less verbose than it would be with an Instance property.

Example:

Input.IsActionPressed("ui_down")

However, in some very rare cases this is not enough. For example, you may want to access a member f