How to Correctly Implement IDisposable When No Unmanaged Resources Are Used?

Implementing IDisposable Properly

A user has reported facing a Code Analysis error while implementing IDisposable in their codebase. To understand the problem, let's examine the code provided:

public class User : IDisposable
{
    // ...

    public void Dispose()
    {
        // Clear property values
        id = 0;
        name = String.Empty;
        pass = String.Empty;
    }
}

The error message, CA1063, suggests that the IDisposable implementation is incorrect. According to Microsoft's documentation, you only need to implement IDisposable if your class holds unmanaged resources or references to disposable objects. In the given code snippet, none of the declared properties require disposal.

To address this issue, a corrected implementation would be:

public class User : IDisposable
{
    // ...

    public void Dispose()
    {
        Dispose(true);
        GC.SuppressFinalize(this);
    }

    protected virtual void Dispose(bool disposing)
    {
        if (disposing) 
        {
            // In this case, there are no managed resources to dispose
        }
        // Also, there are no unmanaged resources to dispose
    }
}

This implementation primarily differs in its use of the protected keyword on the Dispose method. This ensures that only derived classes can use Dispose. The lack of any clean-up code within the Dispose method is appropriate since the class itself does not hold any disposable resources.

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