public static async Task AddIndexAsync()

in dotnetv3/dynamodb/FromSQL/CreateIndexExample/CreateIndexExample/CreateIndex.cs [161:286]
107 lines of code
8 McCabe index (conditional complexity)

    public static async Task<UpdateTableResponse> AddIndexAsync(IAmazonDynamoDB client, string table, string indexname, string partitionkey, string partitionkeytype, string sortkey, string sortkeytype)
    {
      if (client is null)
      {
        throw new ArgumentNullException("client parameter is null");
      }

      if (string.IsNullOrEmpty(table))
      {
        throw new ArgumentNullException("table parameter is null");
      }

      if (string.IsNullOrEmpty(indexname))
      {
        throw new ArgumentNullException("indexname parameter is null");
      }

      if (string.IsNullOrEmpty(partitionkey))
      {
        throw new ArgumentNullException("partitionkey parameter is null");
      }

      if (string.IsNullOrEmpty(sortkey))
      {
        throw new ArgumentNullException("sortkey parameter is null");
      }

      ProvisionedThroughput pt = new ProvisionedThroughput
      {
        ReadCapacityUnits = 10L,
        WriteCapacityUnits = 5L,
      };

      KeySchemaElement kse1 = new KeySchemaElement
      {
        AttributeName = partitionkey,
        KeyType = "HASH",
      };

      KeySchemaElement kse2 = new KeySchemaElement
      {
        AttributeName = sortkey,
        KeyType = "RANGE",
      };

      List<KeySchemaElement> kses = new List<KeySchemaElement>
            {
                kse1,
                kse2,
            };

      Projection p = new Projection
      {
        ProjectionType = "ALL",
      };

      var newIndex = new CreateGlobalSecondaryIndexAction()
      {
        IndexName = indexname,
        ProvisionedThroughput = pt,
        KeySchema = kses,
        Projection = p,
      };

      GlobalSecondaryIndexUpdate update = new GlobalSecondaryIndexUpdate
      {
        Create = newIndex,
      };

      List<GlobalSecondaryIndexUpdate> updates = new List<GlobalSecondaryIndexUpdate>
            {
                update,
            };

      AttributeDefinition ad1;

      if (partitionkeytype == "string")
      {
        ad1 = new AttributeDefinition
        {
          AttributeName = partitionkey,
          AttributeType = "S",
        };
      }
      else
      {
        ad1 = new AttributeDefinition
        {
          AttributeName = partitionkey,
          AttributeType = "N",
        };
      }

      AttributeDefinition ad2;

      if (sortkeytype == "string")
      {
        ad2 = new AttributeDefinition
        {
          AttributeName = sortkey,
          AttributeType = "S",
        };
      }
      else
      {
        ad2 = new AttributeDefinition
        {
          AttributeName = sortkey,
          AttributeType = "N",
        };
      }

      UpdateTableRequest request = new UpdateTableRequest
      {
        TableName = table,
        AttributeDefinitions = {
                    ad1,
                    ad2,
                },
        GlobalSecondaryIndexUpdates = updates,
      };

      var response = await client.UpdateTableAsync(request);

      return response;
    }