可空的ToString（） [英] Nullable ToString()

问题描述

我到处看到像小亭子：

int? myVar = null;
string test = myVar.HasValue ? myVar.Value.ToString() : string.Empty;

为什么不能简单地用：

Why not use simply:

string test = myVar.ToString();

是不是完全一样？
至少反射说：

Isn't that exactly the same ? At least Reflector says that:

public override string ToString()
{
  if (!this.HasValue)
  {
    return "";
  }
  return this.value.ToString();
}

那么，这是否正确（短版）还是我失去了一些东西？

So, is that correct (the shorter version) or am I missing something?

推荐答案

您是相当正确的。此外，在这个问题，前者的解决方案建议，而没有人真正启事 。的ToString（）已经给出了正确的答案

You are quite correct. Also in this question, the former solution is suggested while nobody actually notices ToString() already gives the correct answer.

也许对于更详细的解决方案的说法是可读性：当你调用的ToString（）的东西，是的应该的是空，你平时的期望的一个的NullReferenceException ，虽然这里没有抛出。

Maybe the argument for the more verbose solution is readability: When you call ToString() on something that is supposed to be null, you usually expect a NullReferenceException, although here it isn't thrown.

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