Question

我正在构建一个可以返回XML和Json的WCF休息服务。它可以工作但是当我调用返回XML时，我的XML是一个字符串而不是XML。我认为这是因为我正在将数据表转换为XML。

WCF以适当的XML提供响应，因此我不确定如何将数据XML /文本放在WCF XML响应中并使其成为实际的XML。

这是我的代码......如果需要，我可以提供更多代码.. 我相信我会这样做是正确的，但我错过了一些东西。任何帮助将不胜感激。

IRest.vb

<OperationContract()>
<WebInvoke(Method:="GET", ResponseFormat:=WebMessageFormat.Xml,      
           BodyStyle:=WebMessageBodyStyle.Bare,
           UriTemplate:="xml/getassetnames/?key={key}")>
Function GetAssetNamesXML(key As String) As String

将数据表转换为XML的函数

  Public Shared Function ToXml(dt As DataTable) As String
    Using textWriter = New StringWriter()
        Dim settings = New XmlWriterSettings()
        settings.Indent = True
        settings.IndentChars = "    "
        settings.OmitXmlDeclaration = True

        Using xmlWriter__1 = XmlWriter.Create(textWriter, settings)
            dt.WriteXml(xmlWriter__1)
            Return textWriter.ToString()

        End Using
    End Using
End Function

实现GetAssetNames IRest .. my .svc

Public Function GetAssetNamesXML(ByVal Key As String) As String Implements   IAquaViewRest.GetAssetNamesXML

    Dim dt As New DataTable
    dt = GetAssetNamesDT(Key) 'runs a function that goes to the database and returns a DT
    Return ToXml(dt)
    dt.Clear()

End Function

Answer 1

我没有得到任何回复，但想发布我的解决方案，以便其他人可以使用它。

主要问题是在操作协定中使用字符串作为函数并将DT转换为XML，然后将响应设置为XML，将其序列化。不确定我是否使用了正确的术语，但基本上它用一个字符串标签封装你的DT就是这样。

所以解决这个问题的方法是将您的操作合同作为System.IO.Stream。这也意味着您需要更好的转换DT到XML函数..

这是最终的代码......

<OperationContract()>
<WebInvoke(Method:="GET", BodyStyle:=WebMessageBodyStyle.Wrapped, ResponseFormat:=WebMessageFormat.Xml,
           UriTemplate:="xml/getassetnames/?key={key}")>
Function GetAssetNamesXML(key As String) As System.IO.Stream

DT to XML

Public Shared Function ToXml(dt As DataTable) As String

    Dim settings = New XmlWriterSettings()
    settings.Indent = True
    settings.Encoding = Encoding.GetEncoding("utf-8")
    settings.IndentChars = "    "

    Dim memStream As New MemoryStream()
    Dim writer As XmlWriter = XmlWriter.Create(memStream, settings)

    Using xmlWriter__1 = XmlWriter.Create(memStream, settings)
        dt.WriteXml(xmlWriter__1)
        Dim xml As String = Encoding.GetEncoding("utf-8").GetString(memStream.ToArray())
        Return xml

    End Using

End Function

svc.vb

Public Function GetAssetNamesXML(ByVal Key As String) As System.IO.Stream Implements IAquaViewRest.GetAssetNamesXML

    Dim dt As New DataTable
    dt = GetAssetNamesDT(Key)
    Dim TempStr As String = ToXml(dt)
    Dim resultBytes As Byte() = Encoding.UTF8.GetBytes(TempStr)

    WebOperationContext.Current.OutgoingResponse.ContentType = "text/plain"

    Return New MemoryStream(resultBytes)
    dt.Clear()

End Function

WCF Rest Service ..将Datatable转换为XML

1 个答案: