Question

我创建网络服务似乎

Public Class NameAndvalue
    Public name As String
    Public value As String
End Class
<WebMethod()> _
Public Function ReturnNames_1() As ArrayList
    Dim names As New List(Of NameAndvalue)
    Dim nv As NameAndvalue
    nv = New NameAndvalue With {.name = "AAA", .value = "1"} : names.Add(nv)
    nv = New NameAndvalue With {.name = "BBB", .value = "2"} : names.Add(nv)
    nv = New NameAndvalue With {.name = "CCC", .value = "3"} : names.Add(nv)
    Dim Arr As ArrayList = New ArrayList(names)
    Return Arr
End Function

当我在浏览器中调用时（给我一个错误......）

System.InvalidOperationException：生成错误时出错 XML文档。 ---＆GT; System.InvalidOperationException：类型不期望TMR.AndroidMethods + NameAndvalue。使用XmlInclude 或SoapInclude属性指定未知的类型静态。在 System.Xml.Serialization.XmlSerializationWriter.WriteTypedPrimitive（字符串 name，String ns，Object o，Boolean xsiType）at Microsoft.Xml.Serialization.GeneratedAssembly.XmlSerializationWriter1.Write1_Object（字符串 n，String ns，Object o，Boolean isNullable，Boolean needType）at Microsoft.Xml.Serialization.GeneratedAssembly.XmlSerializationWriter1.Write2_ArrayOfAnyType（对象 o）at Microsoft.Xml.Serialization.GeneratedAssembly.ArrayListSerializer.Serialize（对象 objectToSerialize，XmlSerializationWriter writer）at System.Xml.Serialization.XmlSerializer.Serialize（XmlWriter xmlWriter， Object o，XmlSerializerNamespaces名称空间，String encodingStyle， String id）---内部异常堆栈跟踪结束--- at System.Xml.Serialization.XmlSerializer.Serialize（XmlWriter xmlWriter， Object o，XmlSerializerNamespaces名称空间，String encodingStyle，字符串id）at System.Xml.Serialization.XmlSerializer.Serialize（的TextWriter textWriter，Object o，XmlSerializerNamespaces namespaces）at System.Web.Services.Protocols.XmlReturnWriter.Write（HttpResponse对象响应，Stream outputStream，Object returnValue）at System.Web.Services.Protocols.HttpServerProtocol.WriteReturns（对象[] returnValues，Stream outputStream）at System.Web.Services.Protocols.WebServiceHandler.WriteReturns（对象[] returnValues）at System.Web.Services.Protocols.WebServiceHandler.Invoke（）

知道这个错误我看到它当我从Method返回list(of string)时因为我将List(Of String)的回报更改为ArrayList但发生了同样的问题。

问题是什么？

Answer 1

请尝试使用List(Of NameAndvalue)。以下示例

<WebMethod()> _
Public Function HelloWorld() As List(Of NameAndvalue)
    Dim names As New List(Of NameAndvalue)
    Dim nv As NameAndvalue
    nv = New NameAndvalue With {.name = "AAA", .value = "1"} : names.Add(nv)
    nv = New NameAndvalue With {.name = "BBB", .value = "2"} : names.Add(nv)
    nv = New NameAndvalue With {.name = "CCC", .value = "3"} : names.Add(nv)

    Return names
End Function

返回

<?xml version="1.0" encoding="utf-8"?>
<ArrayOfNameAndvalue xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns="http://tempuri.org/">
  <NameAndvalue>
    <name>AAA</name>
    <value>1</value>
  </NameAndvalue>
  <NameAndvalue>
    <name>BBB</name>
    <value>2</value>
  </NameAndvalue>
  <NameAndvalue>
    <name>CCC</name>
    <value>3</value>
  </NameAndvalue>
</ArrayOfNameAndvalue>

创建包含方法的Web服务时出错返回ArrayList类型

1 个答案: