Your friend should take a look at Gendarme, a FOSS and cross-platform alternative to Microsoft's FxCop/Code Analysis which is part of the Mono project. It includesrules that check for duplicated code.
Atomiq Code Similarity Finder is a tool for developers to find and eliminate duplicate code. It is designed for .NET developers, but works equally well for developers of other languages and even web designers! Atomiq works with a wide variety of source code:
We currently support C#, VB.Net, ASPX, Ruby, Python, Java, C, C++, ActionScript, and XAML, with more extensions on the way soon. It is the perfect companion tool for someone who updates their code infrequently and can't possibly remember everything in it or for a team of 2 or more developers working on the same project that don't know everything in it since they didn't write it all themselves.
Eliminate similar code
(and the banging your head against the wall that comes with it) Atomiq doesn't just find exact matches, it finds similar code. It ignores "fluff" like whitespace, string content, curly braces, comments and using/import statements so you can find the duplicate code that causes problems. In VB.NET, it will also ignore lines that contain only "Next", "End While", "End Try", "End If", "End Property", "End Get" and "End Set".
仅供参考，既然你提到了“快速版”，你可能需要寻找可以在 VS 之外工作的东西，因为我不相信快速版支持插件
More as fyi, since you mentioned 'express edition' you might need to look for something that would work outside of VS, since I don't believe the express editions support plugins
2010 年 10 月编辑：添加了 VB6、VBScript 和 VB.net 作为 CloneDR 支持的语言。 没有对 MS IDE 的特定支持，但它在简单的源文件列表上运行，并生成漂亮的 HTML 报告，因此不需要太多集成。 请参阅链接中的示例报告。
See our CloneDR, which operates on many langauges, including C#.
EDIT October 2010: VB6, VBScript and VB.net added as languages supported by CloneDR. There is no specific support for MS IDEs, but it operates on a simple list of source files, and produces a nice HTML report, so not much integration is needed. See sample reports at link.
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您可以查看 Simian 或 重复查找器。 尽管您可以集成 Simian 相当容易。
You could take a look at Simian or DuplicateFinder. Neither have a dependency on the IDE, although you can integrate Simian quite easily.
克隆侦探看起来似乎对您有用。 我以前没有使用过它，但这周我在 codeplex 上偶然发现了它。
Clone Detective appears as though it might work for you. I haven't used it before, but I stumbled across it on codeplex this week.
您的朋友应该看看 Gendarme，它是 Microsoft FxCop/ 的 FOSS 和跨平台替代品/代码分析是 Mono 项目的一部分。 它 包括 检查重复代码的规则。
Your friend should take a look at Gendarme, a FOSS and cross-platform alternative to Microsoft's FxCop/Code Analysis which is part of the Mono project. It includes rules that check for duplicated code.
尝试 Atomiq：
Try Atomiq:
仅供参考，既然你提到了“快速版”，你可能需要寻找可以在 VS 之外工作的东西，因为我不相信快速版支持插件
More as fyi, since you mentioned 'express edition' you might need to look for something that would work outside of VS, since I don't believe the express editions support plugins
请参阅我们的 CloneDR，它可在多种语言上运行，包括 C#。
2010 年 10 月编辑：添加了 VB6、VBScript 和 VB.net 作为 CloneDR 支持的语言。
没有对 MS IDE 的特定支持，但它在简单的源文件列表上运行，并生成漂亮的 HTML 报告，因此不需要太多集成。 请参阅链接中的示例报告。
See our CloneDR, which operates on many langauges, including C#.
EDIT October 2010: VB6, VBScript and VB.net added as languages supported by CloneDR.
There is no specific support for MS IDEs, but it operates on a simple list of source files, and produces a nice HTML report, so not much integration is needed. See sample reports at link.