得到错误，试图创建一个CRUD Web服务

Question

嗨，这里是我得到的错误：

Value of type 'Integer' cannot be converted to 'music.MusicDataTable'. 
//happens at return deleteSong(...) 
Value of type 'Integer' cannot be converted to 'music.MusicDataTable'. 
//happens at return insertSong(...) 

这是代码，从Web服务的VB页面，在这里我来了获取错误：

Imports System.Web 
Imports System.Web.Services 
Imports System.Web.Services.Protocols 

<WebService(Namespace:="http://tempuri.org/")> _ 
<WebServiceBinding(ConformsTo:=WsiProfiles.BasicProfile1_1)> _ 
<Global.Microsoft.VisualBasic.CompilerServices.DesignerGenerated()> _ 
Public Class getMusicList 
    Inherits System.Web.Services.WebService 

    <WebMethod()> _ 
    Public Function GetMusic() As music.MusicDataTable 
     Dim music As New musicTableAdapters.MusicTableAdapter 
     Return music.GetMusic 
    End Function 

    Public Function deleteSong(ByVal song_title As String) As music.MusicDataTable 
     Dim music As New musicTableAdapters.MusicTableAdapter 
     Return music.deleteSong(song_title) 
    End Function 

    Public Function insertSong(ByVal song_album As String, ByVal song_artist As String, ByVal song_file As String, ByVal song_format As String, ByVal song_size As String, ByVal song_time As String, ByVal song_title As String, ByVal song_track As Integer, ByVal song_year As Integer) As music.MusicDataTable 
     Dim music As New musicTableAdapters.MusicTableAdapter 
     Return music.insertSong(song_album, song_artist, song_file, song_format, song_size, song_time, song_title, song_track, song_year) 
    End Function 


End Class 

MusicDataTable来自称为音乐的数据集。

GetMusic（）的工作原理是因为我没有传递任何东西。我不确定为什么insertSong和deleteSong不起作用。任何帮助，将不胜感激。

Answer 1

显然music.deleteSong和music.insertSong返回integer。您应该将返回类型deleteSong和insertSong更改为与其匹配的整数。