如何使用Fiddler将XML发布到ASP.NET WebAPI

鉴于以下ASP.NET WebAPI,我尝试使用Fiddler发送测试POST,但无法使其工作.无论发送什么,我总是只看到无数据发送到服务消息.

Imports System.Web.Http
Imports System.Net.Http
Imports System.Net

Namespace HelloWebApiDemo

    Public Class MyApiController
        Inherits ApiController

        Public Function [Get]() As HttpResponseMessage
            Return Request.CreateResponse(HttpStatusCode.OK, "Hello")
        End Function

        Public Class MyXmlData
            Public Property UserName As String
            Public Property Password As String
            Public Property SomeData As String
        End Class

        Public Function Post(<FromBody> x As MyXmlData) As HttpResponseMessage
            If x Is Nothing Then
                Return Request.CreateResponse(HttpStatusCode.InternalServerError, "No data sent to service")
            End If
            Dim u As String = String.Empty
            Dim p As String = String.Empty
            Dim d As String = String.Empty
            If Not String.IsNullOrEmpty(x.UserName) Then
                u = x.UserName
            End If
            If Not String.IsNullOrEmpty(x.Password) Then
                p = x.Password
            End If
            If Not String.IsNullOrEmpty(x.SomeData) Then
                d = x.SomeData
            End If
            Return Request.CreateResponse(HttpStatusCode.OK, String.Format("You posted {0}, {1} with a string that is {2} characters in length", u, p, d.Length.ToString))
        End Function

    End Class

End Namespace

在Fiddler,我的POST看起来像这样：

任何人都可以告诉我我做错了什么？我使用Content-Type：text / xml希望ASP.NET能够正确解密它.

更新

新屏幕抓取输入：

保留Content-Type：text / xml请求标头并将XML更改为这样.

<MyApiController.MyXmlData
    xmlns:i="http://www.w3.org/2001/XMLSchema-instance"    
    xmlns="http://schemas.datacontract.org/2004/07/HelloWebApiDemo.HelloWebApiDemo">  
        <Password>somepassword</Password>
        <SomeData>somedata</SomeData>
        <UserName>bob</UserName>
</MyApiController.MyXmlData>