'choose ... when ...' Statements to Control Execution Flows

Q

How to use 'choose ... when ..." policy statements to control execution flows?

✍: FYIcenter.com

A

If you want to control execution flows in Azure API management process, you can use the 'choose ... when ..." policy statement.

The "choose ... when ..." statement has the following syntax:

<choose>   
    <when condition="Boolean_expression">   
        ...
    </when>   
    <when condition="Boolean_expression">   
        ...
    </when>   
    <otherwise>   
        ...
    </otherwise>   
</choose>

For example,

<choose>  
	<when condition="@(context.Variables.GetValueOrDefault&lt;bool>("isMobile"))">  
		<set-query-parameter name="mobile" exists-action="override">  
			<value>true</value>  
		</set-query-parameter>  
	</when>  
	<otherwise>  
		<set-query-parameter name="mobile" exists-action="override">  
			<value>false</value>  
		</set-query-parameter>  
	</otherwise>  
</choose>

Â

â‡’ Policy to Modify Request and Response Body

â‡ Use Custom Variables in Policy Expressions

â‡‘ Using Azure API Policy

â‡‘â‡‘ Microsoft Azure API Management Tutorials

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💬 2021-10-02 FYIcenter.com: @Joe, just follow "Edit API Operation Policy" tutorial, and enter the above code into the policy file.

💬 2021-09-28 Joe D: Do you have any examples of how you would use this? I am really lost on how to implement this.

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