# XML Serializer sample

<!-- Version variant: core_9; default: [/samples/serializers/xml/index.md](/samples/serializers/xml/index.md) -->


This sample demonstrates the built-in NServiceBus XML serializer.

## Configuring to use XML

<!-- snippet: config -->

```cs
var endpointConfiguration = new EndpointConfiguration("Samples.Serialization.Xml");

endpointConfiguration.UseSerialization<XmlSerializer>();

// Then later get it from the service provider when needed
builder.Services.AddSingleton<MessageBodyWriter>();
var serviceProvider = builder.Services.BuildServiceProvider();
var messageBodyWriter = serviceProvider.GetRequiredService<MessageBodyWriter>();

// register the mutator so the the message on the wire is written
endpointConfiguration.RegisterMessageMutator(messageBodyWriter);
```

<!-- endsnippet -->

## Diagnostic mutator

A helper that will log the contents of any incoming message:

<!-- snippet: mutator -->

```cs
public class MessageBodyWriter(ILogger<MessageBodyWriter> logger) :
    IMutateIncomingTransportMessages
{
    public Task MutateIncoming(MutateIncomingTransportMessageContext context)
    {
        var bodyAsString = Encoding.UTF8.GetString(context.Body.ToArray());

        logger.LogInformation("Serialized Message Body:");
        logger.LogInformation(bodyAsString);

        return Task.CompletedTask;
    }
}
```

<!-- endsnippet -->

## Sending the message

<!-- snippet: message -->

```cs
var message = new CreateOrder
{
    OrderId = 9,
    Date = DateTime.Now,
    CustomerId = 12,
    OrderItems = new List<OrderItem>
    {
        new OrderItem
        {
            ItemId = 6,
            Quantity = 2
        },
        new OrderItem
        {
            ItemId = 5,
            Quantity = 4
        },
    }
};

await messageSession.SendLocal(message);
```

<!-- endsnippet -->

## Output

```xml
<?xml version="1.0" ?>
<CreateOrder xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns="http://tempuri.net/XmlSample">
 <OrderId>9</OrderId>
 <Date>2015-09-15T13:33:28.7186624+10:00</Date>
 <CustomerId>12</CustomerId>
 <OrderItems>
  <OrderItem>
   <ItemId>6</ItemId>
   <Quantity>2</Quantity>
  </OrderItem>
  <OrderItem>
   <ItemId>5</ItemId>
   <Quantity>4</Quantity>
  </OrderItem>
 </OrderItems>
</CreateOrder>
```