I know of none, but I would point out that libraries like this tend to:
Get written (normally with some bugs).
Bugs get ironed out though use.
All active bugs are fixed
Optional
'Latent' bugs which could never happen due to previous semantics of the platform on which the library operates crop up if the platform changes in some way.
Thus lack of activity in terms of commits for the library should not indicate that the library is dead, it may indicate it is very stable and solid. If the library is either easy to understand or targeted at a relatively sophisticated audience (as R-Tree usage currently is) then you may find little online dialogue about it.
Lack of download activity is somewhat worrying. Though you are using a fairly niche library on a platform not previously known for heavy GIS/spatial query work (though the changes in SQL Server 2008 may change that).
If you cannot find a Java library of appropriate activity it is unlikely you will find a c# one. If you find such a java one a direct (as opposed to idiomatic) port is unlikely to encouter problems.
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NetTopologySuite 是一个 JTS 移植到 C#，它包含一个 STRtree 类，它是一个只读 R-Tree
The NetTopologySuite is a JTS port to C# and it contains a STRtree class which is a read-only R-Tree
据我所知，没有，但我想指出像这样的库倾向于：
因此，库提交方面缺乏活动不应表明该库已死亡，它可能表明它非常稳定和可靠。如果该库易于理解或针对相对复杂的受众（如目前 R-Tree 的使用），那么您可能会发现很少有关于它的在线对话。
下载活动的缺乏有些令人担忧。尽管您在一个以前不知道用于繁重 GIS/空间查询工作的平台上使用了一个相当小众的库（尽管 SQL Server 2008 中的更改可能会改变这一点）。
如果您找不到具有适当活动的 Java 库，那么您不太可能找到 c# 库。如果您发现这样一个 java 端口，则直接（而不是惯用的）端口不太可能遇到问题。
I know of none, but I would point out that libraries like this tend to:
Thus lack of activity in terms of commits for the library should not indicate that the library is dead, it may indicate it is very stable and solid. If the library is either easy to understand or targeted at a relatively sophisticated audience (as R-Tree usage currently is) then you may find little online dialogue about it.
Lack of download activity is somewhat worrying. Though you are using a fairly niche library on a platform not previously known for heavy GIS/spatial query work (though the changes in SQL Server 2008 may change that).
If you cannot find a Java library of appropriate activity it is unlikely you will find a c# one. If you find such a java one a direct (as opposed to idiomatic) port is unlikely to encouter problems.
根据此线程有一个R-Tree 实现作为 Perst 的一部分：
http://www.mcobject.com/perst_eval
According to this thread there is an R-Tree implementation as part of Perst:
http://www.mcobject.com/perst_eval
RBrush 似乎相当成熟，在 github 上有 103 颗星。
RBrush seems to be pretty mature and it has 103 stars on github.