How to change the value of attribute in appSettings section with Web config transformation

Question

Is it possible to transform the following Web config appSettings file    lt appSettings gt       lt add key  developmentModeUserId  value  00297022    gt       lt add key  developmentMode  value  true    gt         other settings here that should stay     lt  appSettings gt    into something like this    lt appSettings gt       lt add key  developmentMode  value  false    gt         other settings here that should stay     lt  appSettings gt    So  I need to remove the key developmentModeUserId  and I need to replace the value for the key developmentMode

User · Answer

I do not like transformations to have any more info than needed. So instead of restating the keys, I simply state the condition and intention. It is much easier to see the intention when done like this, at least IMO. Also, I try and put all the xdt attributes first to indicate to the reader, these are transformations and not new things being defined.

<appSettings>
  <add xdt:Locator="Condition(@key='developmentModeUserId')" xdt:Transform="Remove" />
  <add xdt:Locator="Condition(@key='developmentMode')" xdt:Transform="SetAttributes"
       value="false"/>
</appSettings>

In the above it is much easier to see that the first one is removing the element. The 2nd one is setting attributes. It will set/replace any attributes you define here. In this case it will simply set value to false.

User · Answer

If you want to make transformation your app setting from web config file to web Release config you have to do the following steps  Let your web config app setting file is this-   lt appSettings gt        lt add key   K1  value  Debendra Dash   gt     lt  appSettings gt    Now here is the web Release config for the transformation    lt appSettings gt       lt add key  K1  value  value dynamicly from Realease         xdt Transform  SetAttributes            xdt Locator  Match key                 gt     lt  appSettings gt    This will transform the value of K1 to the new value in realese Mode

User · Answer

You want something like    lt appSettings gt     lt add key  developmentModeUserId  xdt Transform  Remove  xdt Locator  Match key    gt     lt add key  developmentMode  value  false  xdt Transform  SetAttributes            xdt Locator  Match key    gt   lt  appSettings gt    See Also  Web config Transformation Syntax for Web Application Project Deployment

User · Answer

Replacing all AppSettings  This is the overkill case where you just want to replace an entire section of the web config   In this case I will replace all AppSettings in the web config will new settings in web release config   This is my baseline web config appSettings    lt appSettings gt     lt add key  KeyA  value  ValA   gt     lt add key  KeyB  value  ValB   gt   lt  appSettings gt    Now in my web release config file  I am going to create a appSettings section except I will include the attribute xdt Transform    Replace    since I want to just replace the entire element   I did not have to use xdt Locator because there is nothing to locate     I just want to wipe the slate clean and replace everything    lt appSettings xdt Transform  Replace  gt     lt add key  ProdKeyA  value  ProdValA   gt     lt add key  ProdKeyB  value  ProdValB   gt     lt add key  ProdKeyC  value  ProdValC   gt   lt  appSettings gt    Note that in the web release config file my appSettings section has three keys instead of two  and the keys aren   t even the same   Now let   s look at the generated web config file what happens when we publish    lt appSettings gt      lt add key  ProdKeyA  value  ProdValA   gt      lt add key  ProdKeyB  value  ProdValB   gt      lt add key  ProdKeyC  value  ProdValC   gt    lt  appSettings gt    Just as we expected     the web config appSettings were completely replaced by the values in web release config   That was easy

[c#] How to change the value of attribute in appSettings section with Web.config transformation

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