.NET Core Web/MVC项目编译报CS1056：意外字符'[]'错误，寻求解决建议

Hey there, sorry to hear you're stuck with this frustrating CS1056 error that's popping up 190 times out of nowhere after a few successful builds! Let's walk through some practical fixes that usually resolve this issue:

• Clean and rebuild your solution
  Compilation cache corruption is a super common culprit here. First, right-click your solution in Visual Studio and select Clean Solution. Once that's done, right-click again and choose Rebuild Solution. If you prefer the command line, run these commands in your project directory:

  dotnet clean
  dotnet build
  

• Audit your Razor views for syntax errors
  CS1056 often crops up in Razor files where [] is misused. Keep an eye out for:

  • Accidental empty brackets in expressions (like @Model[].SomeProperty)
  • Conflicts between HTML attributes and Razor syntax (e.g., custom HTML tags with attributes that incorrectly use square brackets)
  • Recent bulk changes to views—those are the most likely sources of widespread errors.

• Inspect your .csproj file for invalid entries
  Sometimes project files get corrupted with wonky build settings. Open your .csproj file and check for:

  • Non-code files (like .html or .txt) incorrectly marked as <Compile> items
  • Duplicate or malformed package references
    Remove any suspicious entries and save the file before rebuilding.

• Update your .NET Core SDK
  .NET Core 2.0.3 is an older version with known compiler bugs. Try updating to the latest patch release in the 2.0.x line (e.g., 2.0.9) or consider upgrading to a newer stable LTS version like 2.1 (just make sure to test for compatibility with your project first). After updating, restart your IDE and rebuild.

• Resolve NuGet package conflicts
  Mismatched or incompatible NuGet packages can trigger weird compiler errors. Open the NuGet Package Manager for your solution and:

  • Ensure all Microsoft.AspNetCore-related packages use versions compatible with .NET Core 2.0.3
  • Remove any unused or outdated packages
  • Clear your NuGet cache (go to Tools > NuGet Package Manager > Package Manager Settings > Clear All NuGet Cache(s))

• Check for interfering extensions or global tools
  If you installed any new Visual Studio extensions or .NET Core global tools before the error started, they might be messing with the build process. Try disabling recently added extensions or uninstalling global tools, then restart Visual Studio and recompile.

内容的提问来源于stack exchange，提问作者Mahmoud Alimohammadi