Improve IDE0059 code fix for TryGetValue

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Area-IDEFeature - IDE0059help wanted

仓库指标

Version Used: Visual Studio 2019 RC

Steps to Reproduce:

string Method(IDictionary<int, string> map, int key)
{
  if (map.TryGetValue(key, out var text))
  {
    return map[key];
  }

  return null;
}

Apply the code fix for IDE0059 reported for the unused variable text.

Expected Behavior:

string Method(IDictionary<int, string> map)
{
  if (map.TryGetValue(key, out var text))
  {
    return text;
  }

  return null;
}

Actual Behavior:

string Method(IDictionary<int, string> map)
{
  if (map.TryGetValue(key, out _))
  {
    return map[key];
  }

  return null;
}