Avoid exceptions in finalizers

Metadata

ID: csharp-best-practices/finalizer-no-exception

Language: C#

Severity: Warning

Category: Best Practices

Description

Do not throw exceptions in finalizer blocks, as it can terminate the whole process if handled incorrectly.

From the official documentation: “If Finalize or an override of Finalize throws an exception, and the runtime is not hosted by an application that overrides the default policy, the runtime terminates the process and no active try/finally blocks or finalizers are executed”.

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Non-Compliant Code Examples

using System.Xml;

class MyClass {
    ~MyClass()
    {
        if (foo) {
            throw new MyException();
        }
        
    }
}
using System.Xml;

class MyClass {
    ~MyClass()
    {
        throw new MyException();
    }
}