About CS Diff
Compare C# source files to review class hierarchy changes, interface implementations, and LINQ query updates. Syntax highlighting covers keywords, attributes, verbatim and interpolated strings, XML doc comments, and block comments.
Frequently Asked Questions
What is a C# diff tool?
A C# diff tool compares two C# source files and highlights every line-level difference — added lines in green, removed lines in red. It lets you audit class changes, review auto-generated code, and compare library modifications without a local Git environment.
How do I compare two C# class files to find breaking API changes?
Paste both files into the diff panels. Focus on public method signature changes (return types, parameter types, added/removed parameters), interface additions or removals, and attribute changes. Breaking changes require a major semantic version increment and caller updates.
Can a C# diff tool handle auto-generated code like EF Core migrations?
Yes. Paste both migration files to see exactly which table operations changed between runs. Focus on new CreateTable, AddColumn, and CreateIndex operations. This helps verify that a scaffolded migration does exactly what you expect before applying it to a shared development or staging database.
How do I compare two .NET configuration files (appsettings.json is already JSON)?
For appsettings.json, use the JSON Diff tool which parses the structure semantically. For XML-based .config files, use the XML Diff tool. For comparing C# code with embedded configuration strings, use this C# Diff tool.
Is my C# code sent to a server when using this online diff tool?
No. All comparison runs in your browser. Your C# source code is never transmitted anywhere. This is safe for proprietary business logic, internal NuGet package source, and C# code from private enterprise repositories.
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