Linux Mint 20.3中MonoDevelop运行时错误：Hello World程序执行失败

Hey there! Let’s work through that frustrating error you’re seeing when trying to run your first MonoDevelop project. I’ve dealt with similar issues on Mint before, so here are the most common fixes to try:

1. Verify Mono Runtime is Fully Installed #

MonoDevelop relies on the Mono runtime to execute .NET applications, and sometimes the default MonoDevelop installation doesn’t include all necessary components.

• Open a terminal and run:

  mono --version
  

• If this command doesn’t return a version number (or throws an error), install the complete Mono package with:

  sudo apt update && sudo apt install mono-complete
  

This will ensure you have all the libraries and tools needed to run .NET executables.

2. Try Running the Executable Manually via Terminal #

Sometimes the issue is with MonoDevelop’s run configuration, not the program itself. Let’s test if the app works outside the IDE:

• Navigate to your project’s output directory (usually MyFirstProject/bin/Debug or MyFirstProject/bin/Release) using:

  cd /home/nidhi/path/to/MyFirstProject/bin/Debug
  

• Run the executable directly with Mono:

  mono MyFirstProject.exe
  

If this works, the problem is likely in MonoDevelop’s settings. If it still fails, note the exact error message—it’ll help narrow down the issue (e.g., missing dependencies, permission issues).

3. Check File Permissions (Just to Rule It Out) #

While Mono doesn’t require .exe files to have executable permissions, it’s worth checking to eliminate this as a cause:

• Run this command to view permissions for your executable:

  ls -l /home/nidhi/path/to/MyFirstProject.exe
  

• If you don’t see an x in the permissions column, add execute rights with:

  chmod +x /home/nidhi/path/to/MyFirstProject.exe
  

Again, this is rarely the fix, but it’s quick to check.

4. Fix MonoDevelop’s Run Configuration #

If manual execution works, the IDE’s run settings might be misconfigured:

• Open your project in MonoDevelop, then go to Run → Run Configurations.
• Select your project’s run configuration from the list.
• In the Execute tab, ensure:
  • The Command is set to mono (not the .exe file itself—MonoDevelop sometimes gets this wrong).
  • The Arguments field points to the full path of your MyFirstProject.exe (e.g., /home/nidhi/Projects/MyFirstProject/bin/Debug/MyFirstProject.exe).
• Avoid spaces or special characters in your project’s directory path—these can break path resolution in the IDE.

5. Clean and Rebuild Your Project #

Build cache corruption can sometimes cause execution issues. Let’s reset that:

• Go to Build → Clean All to clear old build files.
• Then run Build → Build All to rebuild the project from scratch.
• Try running the app again after the rebuild finishes.

内容的提问来源于stack exchange，提问作者Nidhi