Cannot convert null literal to non-nullable reference type.

Possible null reference return.

Possible null reference argument for parameter 'type' in 'string ConvertToCsharpSource(Type type)'.

Possible null reference argument for parameter 'key' in 'string Dictionary<string, string>.this[string key]'.

Possible null reference argument for parameter 'typeFullNameString' in 'string XmlDocumentationExtension.XmlDocumentationKeyHelper(string typeFullNameString, string memberNameString)'.

Cannot convert null literal to non-nullable reference type.

Possible null reference return.

Dereference of a possibly null reference.

Possible null reference return.