背景:我有一个 winForm 应用程序,它根据提供的信息在数据库中注册一个用户,自动生成一个随机密码和用户名,并通过电子邮件向用户发送一个链接,以根据所选的营销公司获取应用程序。
问题:
- 当用户单击“发送邀请”并在调试中除捆绑列表框之外的所有字段上输入数据时,会引发 NullReferenceException 错误,突出显示以下行:Dim MCShort As String = Trim(splitMC(0))
我该如何解决这个问题
这是网络应用程序的屏幕截图:
下面是 default.asx.vb 的 Send_Button_Click 方法的代码:
Private Sub Send_Button_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Send_Button.Click
'TODO Add code to validate that all selections that are reaquired are met.
'ccemail and the additional message are not required
Dim firstname As String = txtFirstName.Text
Dim lastname As String = txtLastName.Text
Dim ccEmail As String = txtccEmail.Text
Dim sb As New StringBuilder
sb.AppendLine("<?xml version=""1.0"" encoding=""utf-8""?>")
sb.AppendLine("<root>")
sb.AppendLine("<MarketingCompany>")
sb.AppendLine("<MarketingCompanyName>")
''Get Marketing Company Short Name
Dim splitMC As String() = Split(marketingCo.SelectedItem, "|")
Dim MCShort As String = Trim(splitMC(0))
sb.AppendLine(String.Format("<MCNAme>{0}</MCNAme>", MCShort))
'sb.AppendLine(String.Format("<MCNAme>{0}</MCNAme>", My.Settings.MarketingCompanyShortName))
sb.AppendLine(String.Format("<ccEmail>{0}</ccEmail>", txtccEmail.Text))
sb.AppendLine(String.Format("<emailMessage>{0}</emailMessage>", txtMessage.Text))
sb.AppendLine(String.Format("<MarketerName>{0}</MarketerName>", txtMarketerName.Text))
sb.AppendLine("<agent>")
sb.AppendLine(String.Format("<FirstName>{0}</FirstName>", txtFirstName.Text))
sb.AppendLine(String.Format("<LastName>{0}</LastName>", txtLastName.Text))
sb.AppendLine(String.Format("<Email>{0}</Email>", txtEmail.Text))
sb.AppendLine("<CRMGuid>123456</CRMGuid>")
Dim spltBundles() As String
For Each item In bundles.Items
If Trim(item) <> "" Then
spltBundles = Split(item, "|")
sb.AppendLine("<ContractingOpportunity>")
sb.AppendLine(String.Format("<Carrier>{0}</Carrier>", Trim(spltBundles(0))))
sb.AppendLine(String.Format("<ContractingOpportunityName>{0}</ContractingOpportunityName>", Trim(spltBundles(1))))
sb.AppendLine("</ContractingOpportunity>")
End If
Next
sb.AppendLine("</agent>")
sb.AppendLine("</MarketingCompanyName>")
sb.AppendLine(" </MarketingCompany>")
sb.AppendLine(" </root>")
Dim xmlStr = sb.ToString
Dim int1 As Boolean = proxy.AddContractOpportunity(xmlStr.ToString, "test", "test")
MsgBox("aComp Invitation Sent! :)")
End Sub