c# - 使用 roslyn 确定基元类型

Question

使用 Roslyn，如何确定 ITypeSymbol 是否为原始类型？

ITypeSymbol 没有 IsPrimitive 属性，如 Type.IsPrimitive

有没有办法将 ITypeSymbol 转换为 Type 或其他一些方法来确定 ITypeSymbol 是否为原始类型？

Answer 1

看起来像确定 TypedConstant class 中的代码，但它是内部的，我找不到可以很好地让我到达那里的公共(public) API。我最终将该方法复制到我的项目中。

    /// <remarks>
    /// TypedConstant isn't computing its own kind from the type symbol because it doesn't
    /// have a way to recognize the well-known type System.Type.
    /// </remarks>
    internal static TypedConstantKind GetTypedConstantKind(ITypeSymbol type, Compilation compilation)
    {
        Debug.Assert(type != null);

        switch (type.SpecialType)
        {
            case SpecialType.System_Boolean:
            case SpecialType.System_SByte:
            case SpecialType.System_Int16:
            case SpecialType.System_Int32:
            case SpecialType.System_Int64:
            case SpecialType.System_Byte:
            case SpecialType.System_UInt16:
            case SpecialType.System_UInt32:
            case SpecialType.System_UInt64:
            case SpecialType.System_Single:
            case SpecialType.System_Double:
            case SpecialType.System_Char:
            case SpecialType.System_String:
            case SpecialType.System_Object:
                return TypedConstantKind.Primitive;
            default:
                switch (type.TypeKind)
                {
                    case TypeKind.Array:
                        return TypedConstantKind.Array;
                    case TypeKind.Enum:
                        return TypedConstantKind.Enum;
                    case TypeKind.Error:
                        return TypedConstantKind.Error;
                }

                if (compilation != null &&
                    compilation.IsSystemTypeReference(type))
                {
                    return TypedConstantKind.Type;
                }

                return TypedConstantKind.Error;
        }
    }