A reasonable set of C# file layout rules for automatic rearranging of Unity code in Rider.

rider-csharp-filelayout.xml

<Patterns xmlns="urn:schemas-jetbrains-com:member-reordering-patterns">
  <TypePattern DisplayName="Non-reorderable types">
    <TypePattern.Match>
      <Or>
        <And>
          <Kind Is="Interface" />
          <Or>
            <HasAttribute Name="System.Runtime.InteropServices.InterfaceTypeAttribute" />
            <HasAttribute Name="System.Runtime.InteropServices.ComImport" />
          </Or>
        </And>
        <Kind Is="Struct" />
        <HasAttribute Name="JetBrains.Annotations.NoReorderAttribute" />
        <HasAttribute Name="JetBrains.Annotations.NoReorder" />
      </Or>
    </TypePattern.Match>
  </TypePattern>

  <TypePattern DisplayName="xUnit.net Test Classes" RemoveRegions="All">
    <TypePattern.Match>
      <And>
        <Kind Is="Class" />
        <HasMember>
          <And>
            <Kind Is="Method" />
            <HasAttribute Name="Xunit.FactAttribute" Inherited="True" />
          </And>
        </HasMember>
      </And>
    </TypePattern.Match>

    <Entry DisplayName="Setup/Teardown Methods">
      <Entry.Match>
        <Or>
          <Kind Is="Constructor" />
          <And>
            <Kind Is="Method" />
            <ImplementsInterface Name="System.IDisposable" />
          </And>
        </Or>
      </Entry.Match>

      <Entry.SortBy>
        <Kind Order="Constructor" />
      </Entry.SortBy>
    </Entry>

    <Entry DisplayName="All other members" />
    <Entry Priority="100" DisplayName="Test Methods">
      <Entry.Match>
        <And>
          <Kind Is="Method" />
          <HasAttribute Name="Xunit.FactAttribute" />
        </And>
      </Entry.Match>
    </Entry>
  </TypePattern>

  <TypePattern DisplayName="NUnit Test Fixtures" RemoveRegions="All">
    <TypePattern.Match>
      <And>
        <Kind Is="Class" />
        <HasAttribute Name="NUnit.Framework.TestFixtureAttribute" Inherited="True" />
      </And>
    </TypePattern.Match>

    <Entry DisplayName="Setup/Teardown Methods">
      <Entry.Match>
        <And>
          <Kind Is="Method" />
          <Or>
            <HasAttribute Name="NUnit.Framework.SetUpAttribute" Inherited="True" />
            <HasAttribute Name="NUnit.Framework.TearDownAttribute" Inherited="True" />
            <HasAttribute Name="NUnit.Framework.FixtureSetUpAttribute" Inherited="True" />
            <HasAttribute Name="NUnit.Framework.FixtureTearDownAttribute" Inherited="True" />
          </Or>
        </And>
      </Entry.Match>
    </Entry>

    <Entry DisplayName="All other members" />

    <Entry Priority="100" DisplayName="Test Methods">
      <Entry.Match>
        <And>
          <Kind Is="Method" />
          <HasAttribute Name="NUnit.Framework.TestAttribute" />
        </And>
      </Entry.Match>
    </Entry>
  </TypePattern>

  <TypePattern DisplayName="Default Pattern">
    <Entry DisplayName="Nested Types">
      <Entry.Match>
        <Kind Is="Type" />
      </Entry.Match>
    </Entry>

    <Entry Priority="100" DisplayName="Public Delegates">
      <Entry.Match>
        <And>
          <Access Is="Public" />
          <Kind Is="Delegate" />
        </And>
      </Entry.Match>
    </Entry>

    <Entry Priority="100" DisplayName="Public Enums">
      <Entry.Match>
        <And>
          <Access Is="Public" />
          <Kind Is="Enum" />
        </And>
      </Entry.Match>
    </Entry>

    <Entry DisplayName="Static Fields and Constants">
      <Entry.Match>
        <Or>
          <And>
            <Kind Is="Constant" />
            <Access Is="Public" />
          </And>
          <And>
            <Kind Is="Field" />
            <Access Is="Public" />
            <Static />
          </And>
        </Or>
      </Entry.Match>
      
      <Entry.SortBy>
        <Kind Order="Constant Field" />
      </Entry.SortBy>
    </Entry>

    <Entry DisplayName="Public Fields">
      <Entry.Match>
        <And>
          <Access Is="Public" />
          <Kind Is="Field" />
        </And>
      </Entry.Match>

      <Entry.SortBy>
        <Readonly />
      </Entry.SortBy>
    </Entry>

    <Entry DisplayName="Serialized Fields">
      <Entry.Match>
        <And>
          <Kind Is="Field" />
          <HasAttribute Name="SerializeField" />
        </And>
      </Entry.Match>

      <Entry.SortBy>
        <Readonly />
      </Entry.SortBy>
    </Entry>

    <Entry DisplayName="Private Static Fields and Constants">
      <Entry.Match>
        <Or>
          <Kind Is="Constant" />
          <And>
            <Kind Is="Field" />
            <Static />
          </And>
        </Or>
      </Entry.Match>

      <Entry.SortBy>
        <Kind Order="Constant Field" />
      </Entry.SortBy>
    </Entry>

    <Entry DisplayName="Private Fields">
      <Entry.Match>
        <And>
          <Kind Is="Field" />
          <Not>
            <Static />
          </Not>
        </And>
      </Entry.Match>

      <Entry.SortBy>
        <Readonly />
      </Entry.SortBy>
    </Entry>

    <Entry DisplayName="Constructors">
      <Entry.Match>
        <Kind Is="Constructor" />
      </Entry.Match>

      <Entry.SortBy>
        <Static />
      </Entry.SortBy>
    </Entry>

    <Entry DisplayName="Properties, Indexers">
      <Entry.Match>
        <Or>
          <Kind Is="Property" />
          <Kind Is="Indexer" />
        </Or>
      </Entry.Match>
    </Entry>

    <Entry Priority="100" DisplayName="Interface Implementations">
      <Entry.Match>
        <And>
          <Kind Is="Member" />
          <ImplementsInterface />
        </And>
      </Entry.Match>

      <Entry.SortBy>
        <ImplementsInterface Immediate="True" />
      </Entry.SortBy>
    </Entry>

    <Entry DisplayName="Public Methods">
      <Entry.Match>
        <And>
          <Kind Is="Method" />
          <Access Is="Public" />
        </And>
      </Entry.Match>
    </Entry>

    <Entry DisplayName="Core Unity MonoBehaviour Messages">
      <Entry.Match>
        <And>
          <Kind Is="Method" />
          <Or>
            <Name Is="Awake" />
            <Name Is="Start" />
          </Or>
        </And>
      </Entry.Match>

      <Entry.SortBy>
        <Name />
      </Entry.SortBy>
    </Entry>

    <Entry DisplayName="OnEnable MonoBehaviour Message">
      <Entry.Match>
        <And>
          <Kind Is="Method" />
          <Name Is="OnEnable" />
        </And>
      </Entry.Match>
    </Entry>

    <Entry DisplayName="OnDisable MonoBehaviour Message">
      <Entry.Match>
        <And>
          <Kind Is="Method" />
          <Name Is="OnDisable" />
        </And>
      </Entry.Match>
    </Entry>

    <Entry DisplayName="OnDestroy MonoBehaviour Message">
      <Entry.Match>
        <And>
          <Kind Is="Method" />
          <Name Is="OnDestroy" />
        </And>
      </Entry.Match>
    </Entry>

    <Entry DisplayName="Update MonoBehaviour Message">
      <Entry.Match>
        <And>
          <Kind Is="Method" />
          <Name Is="Update" />
        </And>
      </Entry.Match>
    </Entry>

    <Entry DisplayName="Unity MonoBehaviour Special Update Messages">
      <Entry.Match>
        <And>
          <Kind Is="Method" />
          <Or>
            <Name Is="FixedUpdate" />
            <Name Is="LateUpdate" />
          </Or>
        </And>
      </Entry.Match>

      <Entry.SortBy>
        <Name />
      </Entry.SortBy>
    </Entry>

    <Entry DisplayName="All Other Unity MonoBehaviour Messages">
      <Entry.Match>
        <And>
          <Kind Is="Method" />
          <Or>
            <Name Is="OnAnimatorIK" />
            <Name Is="OnAnimatorMove" />
            <Name Is="OnApplicationFocus" />
            <Name Is="OnApplicationPause" />
            <Name Is="OnApplicationQuit" />
            <Name Is="OnAudioFilterRead" />
            <Name Is="OnBecameInvisible" />
            <Name Is="OnBecameVisible" />
            <Name Is="OnCollisionEnter" />
            <Name Is="OnCollisionEnter2D" />
            <Name Is="OnCollisionExit" />
            <Name Is="OnCollisionExit2D" />
            <Name Is="OnCollisionStay" />
            <Name Is="OnCollisionStay2D" />
            <Name Is="OnConnectedToServer" />
            <Name Is="OnControllerColliderHit" />
            <Name Is="OnDisconnectedFromServer" />
            <Name Is="OnDrawGizmos" />
            <Name Is="OnDrawGizmosSelected" />
            <Name Is="OnFailedToConnect" />
            <Name Is="OnFailedToConnectToMasterServer" />
            <Name Is="OnGUI" />
            <Name Is="OnJointBreak" />
            <Name Is="OnJointBreak2D" />
            <Name Is="OnMasterServerEvent" />
            <Name Is="OnMouseDown" />
            <Name Is="OnMouseDrag" />
            <Name Is="OnMouseEnter" />
            <Name Is="OnMouseExit" />
            <Name Is="OnMouseOver" />
            <Name Is="OnMouseUp" />
            <Name Is="OnMouseUpAsButton" />
            <Name Is="OnNetworkInstantiate" />
            <Name Is="OnParticleCollision" />
            <Name Is="OnParticleSystemStopped" />
            <Name Is="OnParticleTrigger" />
            <Name Is="OnParticleUpdateJobScheduled" />
            <Name Is="OnPlayerConnected" />
            <Name Is="OnPlayerDisconnected" />
            <Name Is="OnPostRender" />
            <Name Is="OnPreCull" />
            <Name Is="OnPreRender" />
            <Name Is="OnRenderImage" />
            <Name Is="OnRenderObject" />
            <Name Is="OnSerializeNetworkView" />
            <Name Is="OnServerInitialized" />
            <Name Is="OnTransformChildrenChanged" />
            <Name Is="OnTransformParentChanged" />
            <Name Is="OnTriggerEnter" />
            <Name Is="OnTriggerEnter2D" />
            <Name Is="OnTriggerExit" />
            <Name Is="OnTriggerExit2D" />
            <Name Is="OnTriggerStay" />
            <Name Is="OnTriggerStay2D" />
            <Name Is="OnValidate" />
            <Name Is="OnWillRenderObject" />
            <Name Is="Reset" />
          </Or>
        </And>
      </Entry.Match>

      <Entry.SortBy>
        <Name />
      </Entry.SortBy>
    </Entry>

    <Entry DisplayName="All Other Members" />
  </TypePattern>
</Patterns>