如何 model 将 XML POST 与 WebAPI 中的多个子节点绑定（.net core 3）

Question

I am creating a new WebAPI in .NET core 3 which needs to consume XML data POSTed to it. I am able to modelbind an XML document with a single child element, however I cannot modelbind multiple instances of the same child element (equivalent to JSON modelbinding with List or IEnumerable)

The application is running .NET Core 3 version 3.0.100. I have tried to use List and IEnumerable without result. On the XML document I have tried some variations including sending multiple XML documents in the same post request.

My Controller:

[ApiController]
    [Route("[controller]")]
    public class RenewalNoticeJobController : ControllerBase
    {
        [Consumes("application/xml")]
        [Produces("application/xml")]
        [HttpPost("Test")]
        public IActionResult Test([FromBody] IEnumerable<TestDTO> model)
        {
            return Ok(model);
        }
    }

My DTO/Model:

public class TestDTO
    {
        public string TestValue {get;set;}
    }

My XML data sent via POSTman

<TestDTO xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
    <TestValue>TestValue 1</TestValue>
    <TestValue>TestValue 2</TestValue>
</TestDTO>

The error message I am receiving when using IEnumerable:

<problem xmlns="urn:ietf:rfc:7807">
    <status>415</status>
    <title>Unsupported Media Type</title>
    <type>https://tools.ietf.org/html/rfc7231#section-6.5.13</type>
    <traceId>|1a4dfac4-4f43b1e42224c38a.</traceId>
</problem>

And when using List:

<problem xmlns="urn:ietf:rfc:7807">
    <status>400</status>
    <title>One or more validation errors occurred.</title>
    <type>https://tools.ietf.org/html/rfc7231#section-6.5.1</type>
    <traceId>|d6416e-497079dbab2aeefc.</traceId>
    <MVC-Errors>
        <MVC-Empty>An error occurred while deserializing input data.</MVC-Empty>
    </MVC-Errors>
</problem>

Update: I have updated the question to be more clear. What I am trying to modelbind one or more instances of the TestDTO model (equivalent to IEnumerable or List.

Answer 1

There are two issues, one is you need to add xml formatter and another is your xml and model are not sync.

Try follow steps below:

1. Startup.cs

    services.AddMvc().AddJsonOptions().AddXmlSerializerFormatters();

2. Model

    public class TestDTO { public string[] TestValue { get; set; } }

3. Action

   [Consumes("application/xml")] [Produces("application/xml")] [HttpPost("Test")] public IActionResult Test([FromBody] TestDTO model) { return Ok(model); }

4. Request

   <TestDTO xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema"> <TestValue> <string>T1</string> <string>T</string> </TestValue> </TestDTO>