添加到现有的XML文件后，我在开始元素标记的末尾放置了一个正斜杠

Question

是XML的新手，在向现有XML文件添加新节点时遇到问题。

下面是XML文件的外观：

<?xml version="1.0" encoding="utf-8" standalone="yes"?>
<Users>
  <UserName-1>
    <Private-1>
      <PrivateFtpAccountId-1>11111</PrivateFtpAccountId-1>
      <PrivatePassword-1>test1</PrivatePassword-1>
    </Private-1>
    <Public-1>
      <PublicFtpAccountId-1>22222</PublicFtpAccountId-1>
      <PublicPassword-1>test2</PublicPassword-1>
    </Public-1>
  </UserName-1>
  <UserName-2>
    <Private-2>
      <PrivateFtpAccountId-2>33333</PrivateFtpAccountId-2>
      <PrivatePassword-2>test3</PrivatePassword-2>
    </Private-2>
    <Public-2>
      <PublicFtpAccountId-2>44444</PublicFtpAccountId-2>
      <PublicPassword-2>test4</PublicPassword-2>
    </Public-2>
  </UserName-2>
</Users>

我想在最后一组中添加这些内容。

<UserName-3>
    <Private-3>
      <PrivateFtpAccountId-3>55555</PrivateFtpAccountId-3>
      <PrivatePassword-3>test5</PrivatePassword-3>
    </Private-3>
    <Public-3>
      <PublicFtpAccountId-3>66666</PublicFtpAccountId-3>
      <PublicPassword-3>test6</PublicPassword-3>
    </Public-3>
</UserName-3>

在运行下面的代码之后，我生成了这个XML文件(我将替换原来的文件)：

<?xml version="1.0" encoding="utf-8" standalone="yes"?>
<Users>
  <UserName-1>
    <Private-1>
      <PrivateFtpAccountId-1>11111</PrivateFtpAccountId-1>
      <PrivatePassword-1>test1</PrivatePassword-1>
    </Private-1>
    <Public-1>
      <PublicFtpAccountId-1>22222</PublicFtpAccountId-1>
      <PublicPassword-1>test2</PublicPassword-1>
    </Public-1>
  </UserName-1>
  <UserName-2>
    <Private-2>
      <PrivateFtpAccountId-2>33333</PrivateFtpAccountId-2>
      <PrivatePassword-2>test3</PrivatePassword-2>
    </Private-2>
    <Public-2>
      <PublicFtpAccountId-2>44444</PublicFtpAccountId-2>
      <PublicPassword-2>test4</PublicPassword-2>
    </Public-2>
  </UserName-2>
  <UserName-3 />
  <Private-3>
    <PrivateFtpAccountId-3>55555</PrivateFtpAccountId-3>
    <PrivatePassword-3>test5</PrivatePassword-3>
  </Private-3>
  <Public-3>
    <PublicFtpAccountId-3>66666</PublicFtpAccountId-3>
    <PublicPassword-3>test6</PublicPassword-3>
  </Public-3>
</Users>

但是遇到麻烦..。

  Named <UserName-3 /> instead of <UserName-3>   <--- where is the / at the end coming from in the beginning tag?
  Did not indent properly
  No closing tag for this element 

我在控制台应用程序中的代码：

    Dim strId As String
    Dim strPrivateFtpAcctId As String
    Dim strPrivatePassword As String
    Dim strPublicFtpAcctId As String
    Dim strPublicPassword As String

    strPrivateFtpAcctId = "55555"
    strPrivatePassword = "test5"
    strPublicFtpAcctId = "66666"
    strPublicPassword = "test6"
    strId = "3"

    ' Setting these variables above for now but they would actually be coming in as arguments and hence will be dynamically set at runtime.

    Dim xEle As XElement = XElement.Load("MyGoodXMLforadding.xml")
    xEle.Add(New XElement("UserName-" & strId))
    xEle.Add(New XElement("Private-" & strId, New XElement("PrivateFtpAccountId-" & strId, strPrivateFtpAcctId), New XElement("PrivatePassword-" & strId, srPrivatePassword)))
    xEle.Add(New XElement("Public-" & strId, New XElement("PublicFtpAccountId-" & strId, strPublicFtpAcctId), New XElement("PublicPassword-" & strId, "test6")))

    ' Save in place.
    xEle.Save("MyGoodXMLforadding.xml")

我甚至为此硬编码了一个值：

    xEle.Add(New XElement("UserName-3"))

我还是得到了同样的东西。

Regards...Dan

Answer 1

在XML中，此表示法表示元素为空，它是一个自动结束标记：

<UserName-3 /> 

它在逻辑上类似于下面的空元素，但是空元素的语法要长得多：

<UserName-3></UserName-3>

具有自动完成和语法突出显示功能的XML编辑器最初会将您的元素创建为自动关闭，因为它在您定义属性时保持XML有效，这优化了用户体验，但也意味着您不太可能忘记关闭标签。

Answer 2

您应该将<Private-X>和<Public-X>添加到<UserName-X>中，而不是添加到根元素(代码中的xEle)：

........
Dim username = New XElement("UserName-" & strId)
username.Add(New XElement("Private-" & strId, ....))
username.Add(New XElement("Public-" & strId, ....))
xEle.Add(username)
........