UnityEditor.SerializedObject.ApplyModifiedProperties C# (CSharp) Method

        public extern bool ApplyModifiedProperties();
        /// <summary>

    public static bool AddAxis( AxisDefinition axis )
    {
        if( AxisDefined( axis.name ) )
        {
            return false;
        }

        SerializedObject serializedObject = new SerializedObject( AssetDatabase.LoadAllAssetsAtPath( "ProjectSettings/InputManager.asset" )[0] );
        SerializedProperty axesProperty = serializedObject.FindProperty( "m_Axes" );

        axesProperty.arraySize++;
        serializedObject.ApplyModifiedProperties();

        SerializedProperty axisProperty = axesProperty.GetArrayElementAtIndex( axesProperty.arraySize - 1 );

        GetChildProperty( axisProperty, "m_Name" ).stringValue = axis.name;
        GetChildProperty( axisProperty, "descriptiveName" ).stringValue = axis.descriptiveName;
        GetChildProperty( axisProperty, "descriptiveNegativeName" ).stringValue = axis.descriptiveNegativeName;
        GetChildProperty( axisProperty, "negativeButton" ).stringValue = axis.negativeButton;
        GetChildProperty( axisProperty, "positiveButton" ).stringValue = axis.positiveButton;
        GetChildProperty( axisProperty, "altNegativeButton" ).stringValue = axis.altNegativeButton;
        GetChildProperty( axisProperty, "altPositiveButton" ).stringValue = axis.altPositiveButton;
        GetChildProperty( axisProperty, "gravity" ).floatValue = axis.gravity;
        GetChildProperty( axisProperty, "dead" ).floatValue = axis.dead;
        GetChildProperty( axisProperty, "sensitivity" ).floatValue = axis.sensitivity;
        GetChildProperty( axisProperty, "snap" ).boolValue = axis.snap;
        GetChildProperty( axisProperty, "invert" ).boolValue = axis.invert;
        GetChildProperty( axisProperty, "type" ).intValue = (int)axis.type;
        GetChildProperty( axisProperty, "axis" ).intValue = axis.axis - 1;
        GetChildProperty( axisProperty, "joyNum" ).intValue = axis.joyNum;

        serializedObject.ApplyModifiedProperties();
        return true;
    }