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[Source] .NET/C# solution sln to slnx format

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Posted on 2025-12-3 08:56:59 | | | |
Requirements: SLN has always been the VS solution configuration format, if you manually modify the project configuration in the SLN file, you often need to modify many places, the configuration is stinky and long, Microsoft finally realized this problem and proposed a new solution slnx format, the configuration is simple and clear, how to migrate sln to slnx format?

Solution documents have long been . .NET and Visual Studio are an important part of the development experience, and their formats have remained largely the same for over two decades. Recently, the Visual Studio Solutions team launched a new XML-based format, SLNX, which aims to provide a cleaner and more modern solution file format. Starting from .NET SDK 9.0.200, dotnet CLI officially supports generating and manipulating SLNX files, bringing developers a more efficient way to manage solutions.

SLNX format

SLNX is a new XML-based solution file format that offers significant advantages over traditional .sln files. While traditional .sln files are in custom text format and contain a lot of repetitive configuration information and GUID references, SLNX uses a concise XML structure that automatically handles many default configurations to make the file clearer and easier to read.

The advantages of the SLNX format include:

Smaller file volumes
More readable XML structure
Automatically process the default configuration
Better version control friendliness
Future scalability is stronger

This format conversion is implemented thanks to the Microsoft.VisualStudio.SolutionPersistence open source library, which provides a unified API for handling both formats.

SLN migrates the SLNX format

With my own solutionConsoleApp1.slnFor example, as shown in the figure below:



ConsoleApp1.sln The configuration is as follows:
Starting with .NET SDK 9.0.200, migrations can be performed using the dotnet command-line tool with the following commands:
This command reads the .sln file in the current directory and generates the corresponding .slnx file, while retaining the original .sln file. As shown below:



The resulting ConsoleApp1.slnx file is very clean and concise, and the configuration is as follows:

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