internal static ExpressionSyntax GetDefaultValueMinimalSyntax(this IParameterSymbol parameterSymbol, SemanticModel semanticModel, int position, SymbolDisplayFormat format = null)
{
if (parameterSymbol == null)
throw new ArgumentNullException(nameof(parameterSymbol));
if (!parameterSymbol.HasExplicitDefaultValue)
throw new ArgumentException("Parameter must specify default value.", nameof(parameterSymbol));
object value = parameterSymbol.ExplicitDefaultValue;
ITypeSymbol typeSymbol = parameterSymbol.Type;
if (typeSymbol.IsEnum())
{
if (value == null)
return NullLiteralExpression();
IFieldSymbol fieldSymbol = typeSymbol.FindField(f => f.HasConstantValue && value.Equals(f.ConstantValue));
TypeSyntax type = typeSymbol.ToMinimalTypeSyntax(semanticModel, position, format);
if (fieldSymbol != null)
{
return SimpleMemberAccessExpression(type, IdentifierName(fieldSymbol.Name));
}
else
{
return CastExpression(type, LiteralExpression(value));
}
}
if (value == null
&& !typeSymbol.IsReferenceTypeOrNullableType())
{
return DefaultExpression(typeSymbol.ToMinimalTypeSyntax(semanticModel, position, format));
}
return LiteralExpression(value);
}
internal static ExpressionSyntax GetDefaultValueSyntax(this IParameterSymbol parameterSymbol)
{
if (parameterSymbol == null)
{
throw new ArgumentNullException(nameof(parameterSymbol));
}
if (parameterSymbol.HasExplicitDefaultValue)
{
object value = parameterSymbol.ExplicitDefaultValue;
ITypeSymbol type = parameterSymbol.Type;
if (type.IsEnum())
{
if (value != null)
{
IFieldSymbol fieldSymbol = type.FindField(f => f.HasConstantValue && value.Equals(f.ConstantValue));
if (fieldSymbol != null)
{
return(SimpleMemberAccessExpression(type.ToTypeSyntax(), IdentifierName(fieldSymbol.Name)));
}
else
{
return(CastExpression(type.ToTypeSyntax().WithSimplifierAnnotation(), LiteralExpression(value)));
}
}
}
else
{
return(LiteralExpression(value));
}
}
return(null);
}
