vb.net发送邮件smtp和outlook报错（个别）

Question

 'Variable which will send the mail
Dim obj As System.Net.Mail.SmtpClient

'Variable to store the attachments 
Dim Attachment As System.Net.Mail.Attachment

'Variable to create the message to send
Dim Mailmsg As New Mail.MailMessage()
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
    Try

        Dim ol As New Outlook.Application()
        Dim ns As Outlook.NameSpace
        Dim fdMail As Outlook.MAPIFolder

        ns = ol.GetNamespace("MAPI")
        ns.Logon(, , True, True)

        'creating a new MailItem object
        Dim newMail As Outlook.MailItem

        'gets defaultfolder for my Outlook Outbox
        fdMail = ns.GetDefaultFolder(Outlook.OlDefaultFolders.olFolderOutbox)



        'assign values to the newMail MailItem
        newMail = fdMail.Items.Add(Outlook.OlItemType.olMailItem)
        newMail.Subject = "tesst"
        newMail.Body = "test"
        newMail.To = TextBox1.Text
        Dim sSource As String = Application.StartupPath + "\kk.sys"
        ' TODO: Replace with attachment name
        Dim sDisplayName As String = "kaar.jpg"

        Dim sBodyLen As String = newMail.Body.Length


        newMail.SaveSentMessageFolder = fdMail

        newMail.Send()

    Catch ex As Exception


        Using writer As StreamWriter = New StreamWriter(Application.StartupPath + "\err1.txt")

            writer.WriteLine(ex.ToString)



        End Using

    End Try

End Sub

Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
    Try
        Dim SmtpServer As New SmtpClient()
        Dim mail As New MailMessage()
        Dim address As New MailAddress(TextBox1.Text, "Nigraan")
        Dim oAttch As Mail.Attachment = New Mail.Attachment(Application.StartupPath + "\kk.sys")
        SmtpServer.Credentials = New  _
Net.NetworkCredential(TextBox2.Text, TextBox3.Text)
        SmtpServer.Port = "587"
        SmtpServer.Host = "smtp.gmail.com"
        mail = New MailMessage()
        mail.From = New MailAddress(TextBox2.Text)
        mail.To.Add(New MailAddress(TextBox1.Text))
        mail.Subject = TextBox3.Text
        mail.Body = "test"


        mail.Attachments.Add(oAttch)

        SmtpServer.Send(mail)

    Catch ex As Exception

        Using writer As StreamWriter = New StreamWriter(Application.StartupPath + "\err2.txt")

            writer.WriteLine(ex.ToString)



        End Using
    End Try
End Sub

Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
    Try
        System.Diagnostics.Process.Start("mailto:" & TextBox1.Text & "?subject=" & "re:Subject" & "&body=" & "EmailBody")
    Catch ex As Exception

        Using writer As StreamWriter = New StreamWriter(Application.StartupPath + "\err3.txt")

            writer.WriteLine(ex.ToString)



        End Using
    End Try
End Sub`

错误是：

err1：

System.Runtime.InteropServices.COMException (0x80004005)：收件人、抄送或密件抄送框中必须至少有一个名称或分发列表。 在 Microsoft.Office.Interop.Outlook._MailItem.Send() 在 WindowsApplication1.Form1.Button1_Click(Object sender, EventArgs e)

err2：

System.ArgumentException：参数“地址”不能为空字符串。 参数名称：地址 在 System.Net.Mail.MailAddress..ctor（字符串地址，字符串 displayName，编码 displayNameEncoding） 在 WindowsApplication1.Form1.Button2_Click(Object sender, EventArgs e)

当我使用带有 Visual Studio 的机器发送时，两封邮件都会发送，而当这些错误不显示时。

我已经仔细检查了 .net 框架

谢谢你..

Answer 1

尝试创建一个变量字符串并在发送邮件之前设置它

Dim ToEmail as string
ToEmail = Textbox1.text

然后先设置你的地址。

'assign values to the newMail MailItem
    newMail.To = ToEmail
    newMail = fdMail.Items.Add(Outlook.OlItemType.olMailItem)
    newMail.Subject = "tesst"
    newMail.Body = "test"

Answer 2

一切正常，

通过将 ssl 加密设置为 true 来使 smtp 工作

通过创建联系人并在“收件人”字段中提供联系人的电子邮件 ID 来让 Outlook 工作

如果您不想将联系人添加到 Outlook 中，请不要保存联系人：D

耶耶耶！！