Why Doesn't 'Generate Serialization Assembly' Always Work with XmlSerializer, and How Can I Fix It?

Automatically generate XML serialization assembly

Question:

When using XmlSerializer, an exception occurred due to a missing serialization assembly. Why does the Visual Studio setting "Generate Serialized Assembly" not resolve this issue, and how can I resolve it?

Answer:

The "Generate serialization assembly" setting alone is not sufficient, as the SGen task adds the "/proxytypes" switch to the sgen.exe command line, preventing serialization assemblies from being generated without proxy types.

To solve this problem, Microsoft introduced the "SGenUseProxyTypes" MSBuild property that allows you to disable the "/proxytypes" switch. Here’s how to use it:

Step 1: Disable proxy type generation

Before importing Microsoft.Common.Targets or C#/VB.targets, add the following properties to your project file:

<sgenuseproxytypes>false</sgenuseproxytypes>

Step 2: Enable serialization assembly generation

Make sure the "Generate Serialized Assembly" setting is enabled in the project properties.

Modified project file configuration:

<PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|x86' ">
  <GenerateSerializationAssemblies>On</GenerateSerializationAssemblies>
  <SGenUseProxyTypes>false</SGenUseProxyTypes>
</PropertyGroup>
<PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|x86' ">
  <GenerateSerializationAssemblies>On</GenerateSerializationAssemblies>
  <SGenUseProxyTypes>false</SGenUseProxyTypes>
</PropertyGroup>

After making these changes, Visual Studio will automatically generate the Xml serialization assembly without manual intervention.

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