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

["Dirk Sandbrink (JIRA)" <ji...@apache.org>]

Dirk Sandbrink created THRIFT-4290:
--------------------------------------

             Summary: 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: 0.10.0, 0.9.3
         Environment: Windows
            Reporter: Dirk Sandbrink
            Priority: Minor


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:thrift}
struct Work {
  1: i32 num1 = 0,
  2: i32 num2,
  3: Operation op = Operation.ADD,
  4: optional string comment,
}
{code}

The the generated code in Work.cs looks like this:
{code:csharp}
  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:csharp}
  public Operation? Op
  {
    get
    {
      return _op;
    }
    set
    {
      __isset.num1 = value.HasValue;
      if (value.HasValue) this._num1 = value.Value;
    }
  }
{code}

I believe the error is located in file _t_csharp_generator.cc_ in function _t_csharp_generator::generate_csharp_property_:
{code:cpp}
      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:cpp}
      else if (ttype->is_enum()) {
        use_nullable = true;
      }
{code}



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