Inserting multiple items with Web.Config transforms

Question

I've got a C# project that references a lot of WCF services. For local testing, I want to replace the contents of the identity tags so that it will accept anything running on localhost.

The following transformation works, but only inserts the dns element in the first matching location. So, if I had 5 endpoints referenced, one would have the dns tag, and the others would all have empty identity elements.

<system.serviceModel>
    <client>
      <endpoint>
        <identity>
          <dns xdt:Transform="Insert" value="localhost"/>
          <userPrincipalName xdt:Transform="RemoveAll" value="someIdentity" />
        </identity>
      </endpoint>
    </client>
  </system.serviceModel>

How do I alter all of the matching elements, not just the first?

Answer 1

Use the xdt:Locator attribute to define an XPath expression to match all <identity> elements that you want to insert into.

  <system.serviceModel>
    <client>
      <endpoint>
        <identity xdt:Locator="XPath(//identity)">
          <dns xdt:Transform="Insert" value="localhost"/>
          <userPrincipalName xdt:Transform="RemoveAll"/>
        </identity>
      </endpoint>
    </client>
  </system.serviceModel>