[jira] [Closed] (THRIFT-4290) C# nullable option generates invalid code for non-required enum field with default value

["James E. King, III (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/THRIFT-4290?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

James E. King, III closed THRIFT-4290.
--------------------------------------

> C# nullable option generates invalid code for non-required enum field with default value
> ----------------------------------------------------------------------------------------
>
>                 Key: THRIFT-4290
>                 URL: https://issues.apache.org/jira/browse/THRIFT-4290
>             Project: Thrift
>          Issue Type: Bug
>          Components: C# - Compiler
>    Affects Versions: 0.9.3, 0.10.0
>         Environment: Windows
>            Reporter: Dirk Sandbrink
>            Assignee: James E. King, III
>            Priority: Minor
>             Fix For: 0.11.0
>
>
> When generating C# code with the nullable option invalid setter code is generated for enum fields which have a default value (and thus still need an isset flag).
> For example use the Work struct from tutorial.thrift and add a default value to the enum field:
> {code:none}
> struct Work {
>   1: i32 num1 = 0,
>   2: i32 num2,
>   3: Operation op = Operation.ADD,
>   4: optional string comment,
> }
> {code}
> Then the generated code in Work.cs looks like this:
> {code:none}
>   public Operation? Op
>   {
>     get
>     {
>       return _op;
>     }
>     set
>     {
>       __isset.op = true;
>       this._op = value;
>     }
>   }
> {code}
> This code is invalid, because value is of type _Operation?_, the correct code should be:
> {code:none}
>   public Operation? Op
>   {
>     get
>     {
>       return _op;
>     }
>     set
>     {
>       __isset.op = value.HasValue;
>       if (value.HasValue) this._op = value.Value;
>     }
>   }
> {code}
> I believe the error is located in file t_csharp_generator.cc in function t_csharp_generator::generate_csharp_property:
> {code:none}
>       if (ttype->is_base_type()) {
>         use_nullable = ((t_base_type*)ttype)->get_base() != t_base_type::TYPE_STRING;
>       }
> {code}
> Here use_nullable is set to true for all base types other then string, but not for enums.
> A quick fix might be to add
> {code:none}
>       else if (ttype->is_enum()) {
>         use_nullable = true;
>       }
> {code}



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