Process completed with exit code 1.

Possible null reference return.

Possible null reference return.

Change 'Payload' to be read-only by removing the property setter (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca2227)

Change 'List<List<object>>' in 'GridDataResponse.Payload' to use 'Collection<T>', 'ReadOnlyCollection<T>' or 'KeyedCollection<K,V>' (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1002)

Change 'AggregationPayload' to be read-only by removing the property setter (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca2227)

Identifier 'String' contains type name (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1720)

Possible multiple enumerations of 'IEnumerable' collection. Consider using an implementation that avoids multiple enumerations. (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1851)

Possible multiple enumerations of 'IEnumerable' collection. Consider using an implementation that avoids multiple enumerations. (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1851)

Possible multiple enumerations of 'IEnumerable' collection. Consider using an implementation that avoids multiple enumerations. (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1851)