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Unexpected FileNotFoundException when reading a file in .NET Core 3.1 with relative paths

👀 Views: 55 đŸ’Ŧ Answers: 1 📅 Created: 2025-08-21
csharp .net-core file-handling

I'm trying to configure I'm working with a `FileNotFoundException` when trying to read a configuration file using a relative path in my .NET Core 3.1 application... The file is located in the root of my project, and I'm using the following code to read it: ```csharp var filePath = "./config/settings.json"; var json = File.ReadAllText(filePath); ``` When I run the application, I get the following behavior message: ``` Unhandled exception. System.IO.FileNotFoundException: Unable to find the specified file: './config/settings.json' ``` I've tried a few things to debug this scenario. First, I verified that the `settings.json` file is indeed in the project root directory, and I set its properties to ensure it gets copied to the output directory during the build process by setting "Copy to Output Directory" to "Copy if newer". Additionally, I have checked the working directory of the application at runtime using: ```csharp Console.WriteLine(Directory.GetCurrentDirectory()); ``` This prints out `C:\Path\To\Your\Project\bin\Debug\netcoreapp3.1`, which indicates that the relative path I provided is not resolving as expected, since the `config` folder does not exist there. I also tried using an absolute path to see if that resolves the scenario, but I'd prefer to keep it relative to maintain flexibility across different environments. How can I correctly set up the relative path to read my configuration file without running into this `FileNotFoundException`? Are there any best practices for file handling in .NET Core that could help in this scenario? I'm using Csharp LTS in this project. What's the correct way to implement this? My team is using Csharp for this web app.