blocks|key|3185967|text|我找到了一个便宜的变通方法。如果你有很多需要“替换或插入”的元素，那么它并不美观，也不能很好地工作。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3185968|执行"Remove“，然后执行”InsertAfter%7CInsertBefore.“|3185969|例如,|3185970|<authorization+xdt:Transform="Remove"+/>
<authorization+xdt:Transform="InsertAfter(/configuration/system.web/authentication)">
++<deny+users="?"/>
++<allow+users="*"/>
</authorization>|code-block|syntax|javascript|3185971|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|N|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|O|8|@]|9|@]|A|$]]|$1|F|3|G|5|H|7|P|8|@]|9|@]|A|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

I found a cheap workaround. It ain't pretty and won't work very well if you have a lot of elements that needs to be "Replace Or Insert".

Do a "Remove" and then an "InsertAfter|InsertBefore".

For example,

<pre><code>&lt;authorization xdt:Transform="Remove" /&gt;
&lt;authorization xdt:Transform="InsertAfter(/configuration/system.web/authentication)"&gt;
 &lt;deny users="?"/&gt;
 &lt;allow users="*"/&gt;
&lt;/authorization&gt;
</code></pre>

blocks|key|3185973|text|对我来说，更好的方法是只在元素不存在时才插入它，因为我只设置了某些属性。删除该元素将丢弃主元素的任何其他属性(如果它们存在)。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3185974|示例:+web.config+(不带元素)|3185975|<serviceBehaviors>
++++<behavior+name="Wcf.ServiceImplementation.AllDigitalService_Behavior">
++++++++<serviceMetadata+httpGetEnabled="true"+/>
++++</behavior>
</serviceBehaviors>|code-block|syntax|javascript|3185976|web.config+(带元素)|3185977|<serviceBehaviors>
++++<behavior+name="Wcf.ServiceImplementation.AllDigitalService_Behavior">
++++++++<serviceDebug+httpsHelpPageEnabled="true"+/>
++++++++<serviceMetadata+httpGetEnabled="true"+/>
++++</behavior>
</serviceBehaviors>|3185978|使用带有XPath表达式的定位器，如果节点不存在，我添加它，然后设置我的属性：|3185979|<serviceDebug+xdt:Transform="Insert"
++xdt:Locator="XPath(/configuration/system.serviceModel/behaviors/serviceBehaviors/behavior[not(serviceDebug)])"+/>
<serviceDebug+includeExceptionDetailInFaults="true"+xdt:Transform="SetAttributes"+/>|3185980|生成的两个web.config文件的includeExceptionDetailInFaults=都为“true”，第二个文件保留了httpsHelpPageEnabled属性，而remove/insert方法不会保留该属性。|3185981|entityMap^0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|V|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|W|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|X|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|Y|8|@]|9|@]|A|$G|H]]|$1|M|3|N|5|6|7|Z|8|@]|9|@]|A|$]]|$1|O|3|P|5|F|7|10|8|@]|9|@]|A|$G|H]]|$1|Q|3|R|5|6|7|11|8|@]|9|@]|A|$]]|$1|S|3|-4|5|6|7|12|8|@]|9|@]|A|$]]]|T|$]]

A better method for me was to insert the element only if it doesn't exist since I am only setting certain attributes. Removing the element would discard any other attributes of the main element if they existed.

example:
web.config (without element)

<pre><code>&lt;serviceBehaviors&gt;
 &lt;behavior name="Wcf.ServiceImplementation.AllDigitalService_Behavior"&gt;
 &lt;serviceMetadata httpGetEnabled="true" /&gt;
 &lt;/behavior&gt;
&lt;/serviceBehaviors&gt;
</code></pre>

web.config (with element)

<pre><code>&lt;serviceBehaviors&gt;
 &lt;behavior name="Wcf.ServiceImplementation.AllDigitalService_Behavior"&gt;
 &lt;serviceDebug httpsHelpPageEnabled="true" /&gt;
 &lt;serviceMetadata httpGetEnabled="true" /&gt;
 &lt;/behavior&gt;
&lt;/serviceBehaviors&gt;
</code></pre>

Using the Locator with an XPath expression, I add the node if it doesn't exist and then set my attribute:

<pre><code>&lt;serviceDebug xdt:Transform="Insert"
 xdt:Locator="XPath(/configuration/system.serviceModel/behaviors/serviceBehaviors/behavior[not(serviceDebug)])" /&gt;
&lt;serviceDebug includeExceptionDetailInFaults="true" xdt:Transform="SetAttributes" /&gt;
</code></pre>

both resulting web.config files have includeExceptionDetailInFaults="true" and the second one preserves the httpsHelpPageEnabled attribute where the remove/insert method would not.

blocks|key|271522|text|与xdt:Transform="Remove"结合使用VS2012中的xdt:Transform="InsertIfMissing"。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|271523|<authorization+xdt:Transform="Remove"+/>
<authorization+xdt:Transform="InsertIfMissing">
++<deny+users="?"/>
++<allow+users="*"/>
</authorization>|code-block|syntax|javascript|271524|entityMap^0|1|M|Z|V|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]|$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|R|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|S|8|@]|D|@]|E|$]]]|L|$]]

In conjunction with <code>xdt:Transform="Remove"</code> use <code>xdt:Transform="InsertIfMissing"</code> in VS2012.

<pre><code>&lt;authorization xdt:Transform="Remove" /&gt;
&lt;authorization xdt:Transform="InsertIfMissing"&gt;
 &lt;deny users="?"/&gt;
 &lt;allow users="*"/&gt;
&lt;/authorization&gt;
</code></pre>

blocks|key|271526|text|使用InsertIfMissing转换来确保appSetting存在。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|271527|然后使用Replace转换来设置它的值。|271528|<appSettings>
++<add+key="Environment"+xdt:Transform="InsertIfMissing"+xdt:Locator="Match(key)"+/>
++<add+key="Environment"+value="Live"+xdt:Transform="Replace"+xdt:Locator="Match(key)"+/>
</appSettings>|code-block|syntax|javascript|271529|您还可以使用SetAttributes转换而不是Replace。不同之处在于，SetAttributes并不涉及子节点。|271530|<appSettings>++
++<add+key="UseLivePaymentService"+xdt:Transform="InsertIfMissing"+xdt:Locator="Match(key)"+/>
++<add+key="UseLivePaymentService"+value="true"+xdt:Transform="SetAttributes"+xdt:Locator="Match(key)"+/>
</appSettings>|271531|这些技术比remove%2Binsert好得多，因为现有节点不会移动到父节点的底部。新节点将附加到结尾处。现有节点将保留在源文件中的位置。|271532|此答案仅适用于较新版本的Visual+Studio+(2012或更高版本)。|271533|entityMap^0|2|F|0|4|7|0|0|6|D|O|7|13|D|0|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@$9|X|A|Y|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|Z|8|@$9|10|A|11|B|C]]|D|@]|E|$]]|$1|H|3|I|5|J|7|12|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|13|8|@$9|14|A|15|B|C]|$9|16|A|17|B|C]|$9|18|A|19|B|C]]|D|@]|E|$]]|$1|O|3|P|5|J|7|1A|8|@]|D|@]|E|$K|L]]|$1|Q|3|R|5|6|7|1B|8|@]|D|@]|E|$]]|$1|S|3|T|5|6|7|1C|8|@]|D|@]|E|$]]|$1|U|3|-4|5|6|7|1D|8|@]|D|@]|E|$]]]|V|$]]

Use the <code>InsertIfMissing</code> transformation to ensure that the appSetting exists. 
Then use the <code>Replace</code> transformation to set its value.

<pre><code>&lt;appSettings&gt;
 &lt;add key="Environment" xdt:Transform="InsertIfMissing" xdt:Locator="Match(key)" /&gt;
 &lt;add key="Environment" value="Live" xdt:Transform="Replace" xdt:Locator="Match(key)" /&gt;
&lt;/appSettings&gt;
</code></pre>

You could also use the <code>SetAttributes</code> transformation instead of <code>Replace</code>. The difference is that <code>SetAttributes</code> does not touch child nodes.

<pre><code>&lt;appSettings&gt; 
 &lt;add key="UseLivePaymentService" xdt:Transform="InsertIfMissing" xdt:Locator="Match(key)" /&gt;
 &lt;add key="UseLivePaymentService" value="true" xdt:Transform="SetAttributes" xdt:Locator="Match(key)" /&gt;
&lt;/appSettings&gt;
</code></pre>

These techniques are much better than remove+insert because existing nodes are not moved to the bottom of their parent node. New nodes are appended at the end. Existing nodes stay where they are in the source file.

This answer applies only to newer versions of Visual Studio (2012 or newer).

I'm using web.config transformation as described in the below post in order to generate configs for different environments.

<a href="http://vishaljoshi.blogspot.com/2009/03/web-deployment-webconfig-transformation_23.html">http://vishaljoshi.blogspot.com/2009/03/web-deployment-webconfig-transformation_23.html</a>

I can do a "Replace" transformation by matching on the key, e.g.

<pre><code>&lt;add key="Environment" value="Live" xdt:Transform="Replace" xdt:Locator="Match(key)" /&gt;
</code></pre>

And I can do "Inserts" e.g.

<pre><code>&lt;add key="UseLivePaymentService" value="true" xdt:Transform="Insert" /&gt;
</code></pre>

But what I would really find useful is a ReplaceOrInsert transformation, as I can't always rely on the original config file having/not having a certain key.

Is there any way to do this?

Is there any way to do a "Replace Or Insert" using web.config transformation?

Visual Studio

我使用下面的文章中描述的web.config转换，以便为不同的环境生成配置。我可以通过匹配键值来进行“替换”转换，例如<add key="Environment" value="Live" xdt:Transform="Replace" xdt:Locator="Match(key)" />我可以做“插入”。<add ...

问有没有办法使用web.config转换进行“替换或插入”？
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