Tools, FAQ, Tutorials:
'@{...}' Expression Blocks in Azure API Policy
How to use the "@{...}" expression block in Azure API Policy?
✍: FYIcenter.com
The "@{...}" expression block in Azure API Policy can be used to include a C# statement block as the attribute value or text value in most policy statements.
C# statement block in the "@{...}" expression block must end with a "return" statement.
When a "@{...}" expression block is included in a policy statement, the C# statement block will be executed first and the returned value of the "return" statement will be used in the policy statement.
For example, the following "set-body" outbound policy statement uses a "@{...}" expression block to remove a number of properties from response body:
<set-body>@{ var response = context.Response.Body.As<JObject>(); foreach (var key in new [] {"minutely", "hourly", "daily"}) { response.Property(key).Remove(); } return response.ToString(); } </set-body>
Note that the C# statements inside "@{...}" must be XML friendly. For example, the "<" character should be replaced with <:
<trace source="MyDebug">@{context.Response.Body.As<JObject>().ToString()}</trace>
Also note that the "@{...}" expression block can not be mixed with text as attribute values or text contents. The following examples are wrong uses of "@(...)" expressions:
<set-variable name="message" value="Hello @{return "world!";}" /> <trace source="MyDebug">Hello @{return "world!";}</trace> <trace source="MyDebug">@{return "Hello";} world!</trace>
For more information on "@{...}" expression blocks, see API Management policy expressions Website.
⇒ Using the 'context' Object in Policy Expressions
2018-02-14, 2479🔥, 0💬
Popular Posts:
How To Get the Minimum or Maximum Value of an Array in PHP? If you want to get the minimum or maximu...
How to run CMD Commands in Dockerfile to change Windows Docker images? When building a new Windows i...
Where to find tutorials on Using Azure API Management Developer Portal? Here is a list of tutorials ...
How to Install Docker Desktop 2.5.0 on Windows 10? You can follow this tutorial to Install Docker De...
How To Access a Global Variable inside a Function? in PHP? By default, global variables are not acce...