ReSharper的自定义模式替代负平等的表达 [英] resharper custom pattern replacement with negative equality expression

问题描述

我在ReSharper的规则，找到Nullable.HasValue电话

I have a rule in resharper to find calls to Nullable.HasValue

T? foo; 
//...

if(foo.HasValue)
{}

//And it offers to replace with a comparison directly with null:

if(foo != null)
{}

这个伟大的工程，但是当它遇到一个否定 .HasValue ，结果是有点怪怪的。

This works great, but when it encounters a negated .HasValue, the result is a little strange.

if(!foo.HasValue) {}

//is replaced with
if(!(foo != null)) {}

然后ReSharper的要我来简化的声明，只是如果（富== NULL）

Then resharper wants me to simplify the statement to just if(foo == null)

//ideally it would automatically get to this without the extra step:
if(foo == null) {}

该规则被定义为：

type:     System.ValueType or derived
nullable: expression of type System.Nullable<$type$>

search pattern:
$nullable$.HasValue

replace pattern:
$nullable$ != null

（'格式化后替换和缩短引用'都是选中）

('Format after replace' and 'Shorten references' are both checked)

有没有办法让ReSharper的处理它聪明，我可以写这个规则？我试图使第二个规则 $ $可空.HasValue ，但导致这两个规则相匹配，这使得工具提示的建议看起来很奇怪：<！code>更换与== NULL 和与！= NULL 更换。

Is there a way I can write this rule so ReSharper handles it intelligently? I tried making a second rule for !$nullable$.HasValue, but that causes both rules to match which makes tool-tip suggestions look confusing: replace with == null and replace with != null.

推荐答案

如果不是真正强制你可以在这个规则，因为放弃了，按照这个的post ：

If is not really mandatory you can give up on this rule because, according to this post:

编译器代替空的比较一起的HasValue电话，所以没有真正的区别。只要做到取其更可读/更有意义，你和你的同事。

"The compiler replaces null comparisons with a call to HasValue, so there is no real difference. Just do whichever is more readable/makes more sense to you and your colleagues."

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