如何使用 vb.net 电子邮件发送画布图像

Question

我使用 canvg 将 SVG 转换为画布到图像，然后在客户端 vb.net 我将图像转换为 bytearray（） 并将其保存到服务器上的文件夹中，以便我可以通过电子邮件附加：

 Protected Sub Button1_Click(ByVal sender As Object, ByVal e As EventArgs) Handles Button1.Click
    Dim path = Server.MapPath("PDFs")
    Dim fileNameWithPath As String = path + DateTime.Now.ToString().Replace("/", "-").Replace(" ", "-").Replace(":", "") + ".jpeg"
    Dim fs As FileStream = New FileStream(fileNameWithPath, FileMode.Create)
    Dim bw As BinaryWriter = New BinaryWriter(fs)
    Dim ByteArray() As Byte = Convert.FromBase64String(hfChartImg.Value)
    bw.Write(ByteArray)
    bw.Close()
    Dim file As String = fileNameWithPath
    Dim message As New MailMessage()
    message.From = New MailAddress("****************")
    message.To.Add(New MailAddress("***************"))
    message.Subject = "new image "
    message.Body = "this is the apak chart img"
    Dim data As New Attachment(file)
    message.Attachments.Add(data)
    Dim client As New SmtpClient()
    client.Host = "smtp.gmail.com"
    client.Credentials = New NetworkCredential("***************", "*******")
    client.EnableSsl = True
    client.Port = 587
    client.Send(message)
End Sub

此代码工作正常，它发送图像.

实际上我不需要将此图像保存到我的服务器，我只是想发送它而不保存，这就是我到目前为止所做的

 Protected Sub emailSend_Click(ByVal sender As Object, ByVal e As EventArgs) Handles emailSend.Click
    Dim customerChoice As String = DropDownList1.Text
    Select Case customerChoice
        Case "pdf"
            MsgBox("select pdf ")
        Case "image"
            Dim imageFile As MemoryStream = New MemoryStream()
            Dim bw As BinaryWriter = New BinaryWriter(imageFile)
            Dim bytearray() As Byte = Convert.FromBase64String(hfChartImg.Value)
            bw.Write(bytearray)

我离做我想做的事还很远吗???

Answer 1

你正在尝试编写

Dim data As New Attachment(New MemoryStream(ByteArray), "SomeName")