带有变量的vba Outlook嵌入图像

Question

Private Sub inspectors_NewInspector(ByVal Inspector As Microsoft.Office.Interop.Outlook.Inspector) Handles inspectors.NewInspector
    Dim mailItem As Outlook.MailItem = TryCast(Inspector.CurrentItem, Outlook.MailItem)
    If Not (mailItem Is Nothing) Then
        If mailItem.EntryID Is Nothing Then
            mailItem.Subject = "Test"
            mailItem.HTMLBody = mailItem.HTMLBody + "<html><img src='http://example.com/pixel.php></html>"
        End If
    End If
End Sub

以上工作正常。但是当我尝试向图像添加一些变量时，出现以下错误

错误！未指定文件名。

这是我尝试添加变量时的代码：

Private Sub inspectors_NewInspector(ByVal Inspector As Microsoft.Office.Interop.Outlook.Inspector) Handles inspectors.NewInspector
    Dim mailItem As Outlook.MailItem = TryCast(Inspector.CurrentItem, Outlook.MailItem)
    If Not (mailItem Is Nothing) Then
        If mailItem.EntryID Is Nothing Then
            mailItem.Subject = "Test"
            mailItem.HTMLBody = mailItem.HTMLBody + "<html><img src='http://example.com/pixel.php?to=" + mailItem.To + "></html>"
        End If
    End If
End Sub

你知道为什么会这样吗？

Answer 1

关闭你的单引号（没有它如何工作？）

"<html><img src='http://example.com/pixel.php></html>"
                ^

所以其他的 HTML 变成了

"<html><img src='http://example.com/pixel.php?to=" + mailItem.To + "'></html>"
                                                                    ^