UnityEditor.SessionState.GetFloat C# (CSharp) Method

        internal static extern float GetFloat(string key, float defaultValue);
        [MethodImpl(MethodImplOptions.InternalCall)]

        public override void OnEnable()
        {
            base.OnEnable();

            s_PreviewMovementSpeed = SessionState.GetFloat(k_PreviewMovementSpeed, 0.2f);
            s_PreviewTimeScale     = SessionState.GetFloat(k_PreviewTimeScale, 1.0f);
            s_PreviewShape         = (PreviewShape)SessionState.GetInt(k_PreviewShape, 0);
            s_PreviewShapeSize     = SessionState.GetFloat(k_PreviewShapeSize, 5.0f);

            m_CurveEditor.OnEnable(serializedObject);
            s_Inspectors.AddLast(this);
            SceneView.duringSceneGui += OnSceneViewGUI;
            EditorApplication.update += RepaintSceneView;
            ShortcutIntegration.instance.contextManager.RegisterToolContext(m_ShortcutContext);

            s_PlayEvent       = CreateCommandEvent("Play");
            s_StopEvent       = CreateCommandEvent("Stop");
            s_RestartEvent    = CreateCommandEvent("Restart");
            s_ShowBoundsEvent = CreateCommandEvent("ShowBounds");

            m_Time = serializedObject.FindProperty("m_Time");
            m_MinVertexDistance     = serializedObject.FindProperty("m_MinVertexDistance");
            m_Autodestruct          = serializedObject.FindProperty("m_Autodestruct");
            m_Emitting              = serializedObject.FindProperty("m_Emitting");
            m_ApplyActiveColorSpace = serializedObject.FindProperty("m_ApplyActiveColorSpace");
            m_ColorGradient         = serializedObject.FindProperty("m_Parameters.colorGradient");
            m_NumCornerVertices     = serializedObject.FindProperty("m_Parameters.numCornerVertices");
            m_NumCapVertices        = serializedObject.FindProperty("m_Parameters.numCapVertices");
            m_Alignment             = serializedObject.FindProperty("m_Parameters.alignment");
            m_TextureMode           = serializedObject.FindProperty("m_Parameters.textureMode");
            m_TextureScale          = serializedObject.FindProperty("m_Parameters.textureScale");
            m_ShadowBias            = serializedObject.FindProperty("m_Parameters.shadowBias");
            m_GenerateLightingData  = serializedObject.FindProperty("m_Parameters.generateLightingData");
            m_MaskInteraction       = serializedObject.FindProperty("m_MaskInteraction");
        }