VS2015打开VS2012创建的C#项目遇属性读取警告，找不到指定.snl节

Hey there, let's work through this warning you're hitting when opening your VS2012-created C# solution in Visual Studio 2015. Since you don't see the GlobalSection(TeamFoundationVersionControl) = preSolution section that's often cited for this issue, we'll focus on other common fixes tailored to your scenario.

Step 1: Back up your solution file first! #

Before making any changes, always create a copy of your .sln file. If something goes wrong, you can easily revert to the original.

Step 2: Clean up the solution file's global sections #

Open your .sln file in a text editor (like Notepad++ or VS Code) and check for any outdated or unrecognized global sections:

• You mentioned your file starts with:

  Microsoft Visual Studio Solution File, Format Version 12.00
  Visual Studio 14
  VisualStudioVersion = 14.0.23107.0
  MinimumVisualStudioVersion = ...
  

  This version info is correct for VS2015, so that's not the issue.
• Look for other GlobalSection entries (like GlobalSection(SolutionProperties) = preSolution). If you see any sections that look unfamiliar or are VS2012-specific, try commenting them out using a # at the start of each line (since .sln files use # for comments).
• Save the file and try opening it again in VS2015.

Step 3: Update individual project files (.csproj) #

Sometimes the warning stems from outdated project configurations, not the solution file itself:

• Open each .csproj file in a text editor.
• Locate the <Project> tag at the top—check if the ToolsVersion attribute is set to 14.0 (VS2015's tool version). If it's set to an older version like 4.0 or 11.0, update it to:

  <Project ToolsVersion="14.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
  

• Scan through the <PropertyGroup> sections for any VS2012-specific properties (e.g., old build tools references or deprecated settings) and remove them if you don't need them.
• Save each project file, then reopen the solution in VS2015.

Step 4: Rebuild the solution file from scratch #

If the above steps don't resolve the warning, creating a fresh solution file often fixes hidden compatibility issues:

1. Close Visual Studio 2015 completely.
2. Rename your original .sln file (e.g., to Old_Solution.sln) so you don't overwrite it.
3. Open VS2015, go to File > New > Project, create an empty C# solution with the same name as your original.
4. Right-click the new solution in Solution Explorer, select Add > Existing Project, and add all your original .csproj files.
5. Save the new solution, then open it—this should eliminate any leftover VS2012 metadata that's causing the warning.

内容的提问来源于stack exchange，提问作者Nemo