Is there a better way to do connected textures for a tileset?

I'm trying to make connected textures for a tile set, and I'm wondering if there's a better way than using a hundred else if statements. Would it be possible to use a switch-case with this?

 using UnityEngine;
 using UnityEngine.Tilemaps;
 
 // Tile that displays a Sprite when it is alone and a different Sprite when it is orthogonally adjacent to the same NeighourTile
 [CreateAssetMenu]
 public class Block : TileBase
 {
     public Sprite block;
     public Sprite blockR;
     public Sprite blockRL;
     public Sprite blockL;
     public Sprite blockD;
     public Sprite blockRD;
     public Sprite blockLD;
     public Sprite blockUD;
     public Sprite blockU;
     public Sprite blockUR;
     public Sprite blockUL;
     public Sprite blockULR;
     public Sprite blockRLD;
     public Sprite blockULD;
     public Sprite blockURD;
     public Sprite blockUDRL;
     [Space]
     public Sprite blockDLC;
     public Sprite blockDRC;
     public Sprite blockURC;
     public Sprite blockULC;
     [Space]
     public Sprite blockUDRC;
     public Sprite blockUDLC;
     public Sprite blockURLC;
     public Sprite blockDRLC;
     [Space]
     public Sprite blockUDRLC;
 
 
 
 
 
 
 
 
     public override void RefreshTile(Vector3Int position, ITilemap tilemap)
     {
         for (int yd = -1; yd <= 1; yd++)
         {
             Vector3Int location = new Vector3Int(position.x, position.y + yd, position.z);
             if (IsNeighbour(location, tilemap))
                 tilemap.RefreshTile(location);
         }
         for (int xd = -1; xd <= 1; xd++)
         {
             Vector3Int location = new Vector3Int(position.x + xd, position.y, position.z);
             if (IsNeighbour(location, tilemap))
                 tilemap.RefreshTile(location);
         }
     }
 
     public override void GetTileData(Vector3Int position, ITilemap tilemap, ref TileData tileData)
     {
         tileData.sprite = block;
 
         Vector3Int up = new Vector3Int(position.x, position.y + 1, position.z);
         Vector3Int down = new Vector3Int(position.x, position.y - 1, position.z);
         Vector3Int left = new Vector3Int(position.x - 1, position.y, position.z);
         Vector3Int right = new Vector3Int(position.x + 1, position.y, position.z);
         Vector3Int upRight = new Vector3Int(position.x + 1, position.y + 1, position.z);
         Vector3Int downLeft = new Vector3Int(position.x - 1, position.y - 1, position.z);
         Vector3Int upLeft = new Vector3Int(position.x - 1, position.y + 1, position.z);
         Vector3Int downRight = new Vector3Int(position.x + 1, position.y - 1, position.z);
 
 
 
 
         if (IsNeighbour(up, tilemap) && IsNeighbour(down, tilemap) && !IsNeighbour(right, tilemap) && !IsNeighbour(left, tilemap))
         {
             tileData.sprite = blockUD;
         }
         else if (IsNeighbour(up, tilemap) && !IsNeighbour(down, tilemap) && !IsNeighbour(right, tilemap) && !IsNeighbour(left, tilemap))
         {
             tileData.sprite = blockU;
         }
         else if (IsNeighbour(down, tilemap) && !IsNeighbour(up, tilemap) && !IsNeighbour(right, tilemap) && !IsNeighbour(left, tilemap))
         {
             tileData.sprite = blockD;
         }
         else if (IsNeighbour(left, tilemap) && IsNeighbour(right, tilemap) && !IsNeighbour(up, tilemap) && !IsNeighbour(down, tilemap))
         {
             tileData.sprite = blockRL;
         }
         else if (IsNeighbour(left, tilemap) && !IsNeighbour(down, tilemap) && !IsNeighbour(up, tilemap) && !IsNeighbour(right, tilemap))
         {
             tileData.sprite = blockL;
         }
         else if (IsNeighbour(right, tilemap) && !IsNeighbour(down, tilemap) && !IsNeighbour(up, tilemap) && !IsNeighbour(left, tilemap))
         {
             tileData.sprite = blockR;
         }
         else if (IsNeighbour(up, tilemap) && IsNeighbour(right, tilemap) && !IsNeighbour(upRight, tilemap) && !IsNeighbour(left, tilemap) && !IsNeighbour(down, tilemap))
         {
             tileData.sprite = blockUR;
         }
         else if (IsNeighbour(up, tilemap) && IsNeighbour(left, tilemap) && !IsNeighbour(upLeft, tilemap) && !IsNeighbour(right, tilemap) && !IsNeighbour(down, tilemap))
         {
             tileData.sprite = blockUL;
         }
         else if (IsNeighbour(left, tilemap) && IsNeighbour(down, tilemap) && !IsNeighbour(downLeft, tilemap) && !IsNeighbour(up, tilemap) && !IsNeighbour(right, tilemap))
         {
             tileData.sprite = blockLD;
         }
         else if (IsNeighbour(right, tilemap) && IsNeighbour(down, tilemap) && !IsNeighbour(downRight, tilemap) && !IsNeighbour(up, tilemap) && !IsNeighbour(left, tilemap))
         {
             tileData.sprite = blockRD;
         }
         else if (IsNeighbour(up, tilemap) && IsNeighbour(right, tilemap) && IsNeighbour(down, tilemap) && !IsNeighbour(left, tilemap))
         {
             tileData.sprite = blockUDRC;
         }
         else if (IsNeighbour(up, tilemap) && IsNeighbour(left, tilemap) && IsNeighbour(down, tilemap) && !IsNeighbour(right, tilemap))
         {
             tileData.sprite = blockUDLC;
         }
         else if (IsNeighbour(right, tilemap) && IsNeighbour(left, tilemap) && IsNeighbour(up, tilemap) && !IsNeighbour(down, tilemap))
         {
             tileData.sprite = blockURLC;
         }
         else if (IsNeighbour(right, tilemap) && IsNeighbour(left, tilemap) && IsNeighbour(down, tilemap) && !IsNeighbour(up, tilemap))
         {
             tileData.sprite = blockDRLC;
         }
         else if (IsNeighbour(right, tilemap) && IsNeighbour(up, tilemap) && IsNeighbour(upRight, tilemap) && !IsNeighbour(down, tilemap) && !IsNeighbour(left, tilemap))
         {
             tileData.sprite = blockURC;
         }
         else if (IsNeighbour(left, tilemap) && IsNeighbour(up, tilemap) && IsNeighbour(upLeft, tilemap) && !IsNeighbour(down, tilemap) && !IsNeighbour(right, tilemap))
         {
             tileData.sprite = blockULC;
         }
         else if (IsNeighbour(right, tilemap) && IsNeighbour(down, tilemap) && IsNeighbour(downRight, tilemap) && !IsNeighbour(up, tilemap) && !IsNeighbour(left, tilemap))
         {
             tileData.sprite = blockDRC;
         }
         else if (IsNeighbour(left, tilemap) && IsNeighbour(down, tilemap) && IsNeighbour(downLeft, tilemap) && !IsNeighbour(up, tilemap) && !IsNeighbour(right, tilemap))
         {
             tileData.sprite = blockDLC;
         }
         else if (IsNeighbour(right, tilemap) && IsNeighbour(left, tilemap) && IsNeighbour(up, tilemap) && IsNeighbour(down, tilemap) && IsNeighbour(upLeft, tilemap) && IsNeighbour(upLeft, tilemap) && IsNeighbour(downRight, tilemap) && IsNeighbour(downLeft, tilemap))
         {
             tileData.sprite = blockUDRLC;
         }
         else if (IsNeighbour(right, tilemap) && IsNeighbour(left, tilemap) && IsNeighbour(up, tilemap) && IsNeighbour(down, tilemap) && !IsNeighbour(upLeft, tilemap) && !IsNeighbour(upLeft, tilemap) && !IsNeighbour(downRight, tilemap) && !IsNeighbour(downLeft, tilemap))
         {
             tileData.sprite = blockUDRL;
         }
         else
         {
             tileData.sprite = block;
         }
 
 
     }
 
     private bool IsNeighbour(Vector3Int position, ITilemap tilemap)
     {
         TileBase tile = tilemap.GetTile(position);
         return (tile != null && tile == this);
     }
 }