VB.Net，Linq到Xml:这是创建xml时使用逻辑的正确方法吗? [英] VB.Net, Linq to Xml: Is this the correct way to use logic while creating xml?

问题描述

在构建xml文档时，我需要使用逻辑来指示xml的结果；从逻辑上讲，它类似于以下代码(尽管这不起作用):

While building an xml document I require to use logic to dictate the outcome of the xml; logically it is similar to the following piece of code (although this does not work):

    Dim buildElement As Boolean = True
    Dim xe As XElement = _
    <xml>
        <% If buildElement Then %>
        <BuildMyElement><%= buildElement.ToString %></BuildMyElement>
        <% End If %>
    </xml>

我设法使用下面显示的方法来做到这一点，这是建议的这样做的方法还是有更好的方法?

I have managed to do this using the method show below, is this the suggested way of doing this or is there a better one??

    Dim buildElement As Boolean = True
    Dim xe As XElement = _
    <xml>
        <%= If(buildElement, _
            <BuildMyElement><%= buildElement.ToString %></BuildMyElement>, _
            Nothing) %>
    </xml>

推荐答案

在一行中使用If子句时，有2个重载:

when you use the If clause in one line you have 2 overload that are:

 IF(condition, true, false) 

或

 If(Condition,False)

您可以编写类似这样的内容，以避免不分配任何值:

You could write something like this to avoid assigning nothing value:

If(buildElement is nothing,<BuildMyElement><%= buildElement.ToString %></BuildMyElement>)

这篇关于VB.Net，Linq到Xml:这是创建xml时使用逻辑的正确方法吗?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！