Why Does XmlSerializer Throw a FileNotFoundException, and How Can I Prevent It?

Troubleshooting FileNotFoundException with XmlSerializer

When using XmlSerializer to serialize a type, you might encounter a FileNotFoundException. This happens even if you haven't explicitly defined custom serializers.

<code class="language-csharp">XmlSerializer serializer = new XmlSerializer(typeof(MyType));</code>

The error message indicates the serializer can't load an assembly expected to contain custom serializers for MyType.

The Root Cause:

The XmlSerializer searches for these serializers in an assembly named [Containing Assembly of MyType].XmlSerializers. This is standard behavior, and the process usually continues without issues.

Resolving the Exception:

In most cases, this exception is harmless and can be safely ignored. The serialization will complete successfully. To suppress the exception messages during debugging, however, you can disable first-chance exceptions for System.IO.FileNotFoundException:

1. In Visual Studio, open the Debug -> Exceptions window (or press Ctrl Alt E).
2. Locate Common Language Runtime Exceptions -> System.IO -> System.IO.FileNotFoundException.
3. Uncheck the "Thrown" box.

A Proactive Approach:

For a more permanent solution, consider using Chris Sells' XmlSerializerPreCompiler tool. This tool pre-generates custom serializers, eliminating the need for the XmlSerializer to search at runtime and preventing the FileNotFoundException altogether. More details can be found in the blog post "C# XmlSerializer FileNotFound exception."

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