我有一个这样创建的服务。
服务.vb
_ 公共类 UmbrellaService 继承 System.Web.Services.WebService 实现 IUmbrellaMobileService
Function GetCustomers() As List(Of Customers) Implements IUmbrellaMobileService.GetCustomers
Try
Dim Cust As List(Of Customers) = New List(Of Customers)
Dim SQLSTR As String = ""
SQLSTR = "Select Companies.Code, Companies.Name FROM Companies WHERE ISCustomer = '1'"
Dim ErrorMessage As String = ""
ErrorMessage = UmbrellaDataManagementObj.OpenConnection(SQLServer, UmbrellaDatabase, UserCode, UserPassword)
If ErrorMessage <> "" Then
System.Diagnostics.EventLog.WriteEntry("Umbrella Mobile Service", ErrorMessage & vbNewLine & UmbrellaDataManagementObj.ConnectionString, EventLogEntryType.Error)
WebOperationContext.Current.OutgoingResponse.StatusCode = 501
WebOperationContext.Current.OutgoingResponse.StatusDescription = ErrorMessage
Return Nothing
Else
Dim CustomerDetails As DataSet
CustomerDetails = UmbrellaDataManagementObj.GetDataSQL(SQLSTR)
If Not CustomerDetails Is Nothing Then
CustomerDetails.DataSetName = "Companies"
CustomerDetails.Tables(0).TableName = "Companies"
Dim CustomerTable As DataTable
Dim CustomerRow As DataRow
If CustomerDetails.Tables.Count > 0 Then
CustomerTable = CustomerDetails.Tables(0)
If CustomerTable.Rows.Count > 0 Then
Dim i As Integer
For i = 0 To CustomerTable.Rows.Count - 1
CustomerRow = CustomerTable.Rows(i)
Dim CC As New Customers
CC.Code = CustomerRow.Item("Code")
CC.Name = CustomerRow.Item("Name")
Cust.Add(CC)
Next i
' Serialize the results as JSON
Dim serializer As DataContractJsonSerializer = New DataContractJsonSerializer(Cust.GetType())
Dim Stream As MemoryStream = New MemoryStream
serializer.WriteObject(Stream, Cust)
' Return the results serialized as JSON
Dim json As String = Encoding.Default.GetString(Stream.ToArray())
' Return json
Return Cust
UmbrellaDataManagementObj.CloseConnection()
WebOperationContext.Current.OutgoingResponse.StatusCode = 200
WebOperationContext.Current.OutgoingResponse.StatusDescription = "OK"
End If
End If
'Return Cust
Else
System.Diagnostics.EventLog.WriteEntry("Umbrella Mobile Service", UmbrellaDataManagementObj.ErrorMessage, EventLogEntryType.Error)
WebOperationContext.Current.OutgoingResponse.StatusCode = 501
WebOperationContext.Current.OutgoingResponse.StatusDescription = UmbrellaDataManagementObj.ErrorMessage
Cust = Nothing
Return Nothing
End If
End If
Catch ex As Exception
System.Diagnostics.EventLog.WriteEntry("Umbrella Mobile Service", ex.Message, EventLogEntryType.Error)
WebOperationContext.Current.OutgoingResponse.StatusCode = 501
WebOperationContext.Current.OutgoingResponse.StatusDescription = ex.Message
Return Nothing
End Try
Dispose()
End Function
界面如下所示：
<ServiceContract()> _
Public Interface IUmbrellaMobileService
<OperationContract()> _
<WebInvoke(Method:="GET", BodyStyle:=WebMessageBodyStyle.Bare, ResponseFormat:=WebMessageFormat.Json)> _
Function GetCustomers() As List(Of Customers)
End Interface
我的数据合同看起来像：
<DataContract()> _
Public Class Customers
Dim CompanyName As String
Dim CompanyCode As String
<DataMember()> _
Public Property Name() As String
Get
Return CompanyName
End Get
Set(ByVal value As String)
CompanyName = value
End Set
End Property
<DataMember()> _
Public Property Code() As String
Get
Return CompanyCode
End Get
Set(ByVal value As String)
CompanyCode = value
End Set
End Property
End Class
现在，当我输入地址http://agilesoft.dyndns.org/UmbrellaMobileService/GetCustomers时，我得到的 JSON 数组返回如下：
[{"Code":"001","Name":"rainbow"},{"Code":"009MAY","Name":"AMG AUDIO : HIRE ACC."}]
我正在尝试在我的 Devextreme 应用程序中显示此信息。这是我的 dxview 的代码：
<div data-options="dxView : { name: 'Customer', title: 'Customer' } " >
<div data-options="dxContent : { targetPlaceholder: 'content' } " >
<div data-bind="dxList: { items: listItems }">
<div data-options="dxTemplate: { name: 'item' } ">
<div data-bind="text: Name"></div>
</div>
</div>
</div>
</div>
这是js文件的代码：
UmbrellaMobile.Customer = function (params) {
var baseAddress = 'http://agilesoft.dyndns.org/UmbrellaMobileService/GetCustomers';
var listItems;
var viewModel = {
Customers: new DevExpress.data.CustomStore({
load: function () {
return $.ajax({
url: baseAddress,
crossOrigin: true,
jsonp: true,
type: 'GET',
data: '{}',
dataType: 'jsonp',
contentType: "application/json; charset=utf-8",
success: function (res) {
listItems: data;
console.log("success");
},
error: function (res) {
console.log("error");
}
});
}
})
};
return {
listItems: listItems,
viewModel: viewModel
};
};
当我在 Firefox 中运行此应用程序时，我收到一条消息“没有要显示的数据”
我试图调试代码。我已经设置了断点并查看了控制台窗口以获取任何提示。我没有收到任何错误。ajax 调用永远不会被执行，或者看起来它永远不会被击中
我只想显示信息
谁能帮忙看看是什么问题？