Question

我想将数据提供给代理，该代理会创建一个格式如下的soap XML请求：

<dat:MusicCollection>
           <!--Zero or more repetitions:-->
           <dat:Song>
              <dat:songUserkey>TakemeHome</dat:songUserkey>
           </dat:Song>
</dat:MusicCollection>

我已经编写了文件来调用该服务，并提供如下详细信息：

dim ucizi1 as SongRequest 'this is the request class in the proxy
dim Songs as Song = New Song
Songs.songUserKey = "TakeMeHome"
dim ucz
ucz = Songs.SongUserKey
ucizi1.SongCollection.Add(ucz)

MusicCollection类如下：

<System.Diagnostics.DebuggerStepThroughAttribute(),  _
 System.CodeDom.Compiler.GeneratedCodeAttribute("System.Runtime.Serialization", "4.0.0.0"),  _
 System.Runtime.Serialization.CollectionDataContractAttribute(Name:="ProductCollection", [Namespace]:="http://ucizi.Musicservice/DataContracts", ItemName:="Song")>  _
Public Class SongCollection
    Inherits System.Collections.Generic.List(Of ucizi.Music.DataContracts.Song)
End Class

歌曲课程如下：

<System.Diagnostics.DebuggerStepThroughAttribute(),  _
 System.CodeDom.Compiler.GeneratedCodeAttribute("System.Runtime.Serialization", "4.0.0.0"),  _
 System.Runtime.Serialization.DataContractAttribute(Name:="Product", [Namespace]:="http://Ucizi.Music/DataContracts")>  _
Partial Public Class Product
    Inherits Object
    Implements System.Runtime.Serialization.IExtensibleDataObject

    Private extensionDataField As System.Runtime.Serialization.ExtensionDataObject

    Private SongUserkeyField As String

    Public Property ExtensionData() As System.Runtime.Serialization.ExtensionDataObject Implements System.Runtime.Serialization.IExtensibleDataObject.ExtensionData
        Get
            Return Me.extensionDataField
        End Get
        Set
            Me.extensionDataField = value
        End Set
    End Property

    <System.Runtime.Serialization.DataMemberAttribute(IsRequired:=true)>  _
    Public Property SongUserkey() As String
        Get
            Return Me.SongUserkeyField
        End Get
        Set
            Me.SongUserkeyField = value
        End Set
    End Property
End Class

但是，当我运行此代码时，我收到一个错误：无法将类型为'system.string'的对象强制转换为'ucizi.music.DataContracts.Song'。

我无法看到这个错误的来源，有些人可以帮助我，并建议我如何纠正这个错误。

Answer 1

在行

Songs.songUserKey = "TakeMeHome"
dim ucz
ucz = Songs.SongUserKey
ucizi.SongCollection.Add(ucz)

您将ucz设置为SongUserKey - 这是字符串。

然后，将其添加到集合 SongCollection

Public Class SongCollection
    Inherits System.Collections.Generic.List(Of ucizi.Music.DataContracts.Song)
End Class

预期 Song

Answer 2

在 Songs.songUserKey =“TakeMeHome”后添加以下代码

dim ucizi2 as songCollection
ucizi2.Add(song)
ucizi1.songcollection = ucizi2

这使问题顺利排序。你们睁开眼睛。

创建Web服务请求

2 个答案: