错误CS1525：符号'？'意外，期望为'。'在monodevelop中

Question

这是给我错误的代码：

s.GetWeight(out weightInLb, out weightInG, out weightInOz, out bool? isStable);

 Error CS1525: Unexpected symbol `?', expecting `.'

此代码调用函数GetWeight，这是代码：

 public void GetWeight(out decimal? weightInLb, out decimal? weightInG, out decimal? weightInOz, out bool? isStable)

我在做什么错？请帮忙！

编辑

如果我更换了？与。我收到错误消息：

Error CS0117: `bool' does not contain a definition for `isStable'

Answer 1

您似乎正在尝试使用out variables，但编译器不支持。用老式的方式做吧

bool? isStable;
s.GetWeight(out weightInLb, out weightInG, out weightInOz, out isStable);