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Code Inspections

Unity support ships with several inspections designed to help you find issues with your code before you run it. The following pages provide more details about why Rider or ReSharper is showing a particular inspection.

Note that these pages can be navigated to from the Alt+Enter menu, under the "Inspection: …" sub menu, there will be a menu item "Why is Rider suggesting this?" or "Why is ReSharper suggesting this?". Selecting this item will navigate to the appropriate page in the list below.

Inspection	Default severity	First introduced
Accessing multidimensional arrays is inefficient. Use a jagged or one-dimensional array instead	Performance indicator	2020.1
Alternative non-allocating method available	Warning	2018.3
Attribute is redundant when applied to this declaration type	Dead code
'base.OnGUI()' will print "No GUI Implemented" in the Unity inspector	Warning	2018.3
Camera.main is inefficient in frequently called methods	Performance indicator	2018.2
Expensive method invocation	Performance indicator	2018.3
Expensive null comparison	Performance indicator	2018.3
MonoBehaviors must be instantiated with GameObject.AddComponent instead of new	Warning
Order of multiplication operations is inefficient	Performance indicator	2019.2
Possible mis-application of 'FormerlySerializedAs' attribute to multiple fields	Warning	2018.2
Possible unintended bypass of lifetime check of underlying Unity engine object	Warning
Redundant 'FormerlySerializedAs' attribute	Dead code	2018.2
Redundant 'HideInInspector' attribute	Dead code	2018.2
Redundant 'InitializeOnLoad' attribute	Dead code
Redundant 'SerializeField' attribute	Dead code
Redundant Unity event function	Dead code
Repeated property access of built in component is inefficient	Warning	2018.3
ScriptableObjects must be instantiated with ScriptableObject.CreateInstance instead of new	Warning
Setting 'parent' property immediately after object instantiation is inefficient	Warning	2018.3
String based type lookup is inefficient, use generic overload	Warning	2018.3
String based property lookup is inefficient	Warning	2018.3
Use CompareTag instead of explicit string comparison	Warning

See also details on performance indicators and the performance critical context.