<inbound> <base /> <set-variable name="starttime" value="@(DateTime.UtcNow)" /> <set-header name="Policy-Execution-TimeStamp" exists-action="append"> <value>@(starttime.ToString("r"))</value> </set-header> </inbound> I get error "The name 'starttime' does not exist in the current context" what is the correct syntax?

@Martin Kallukalam Thanks for reaching out please refer the below policy snippet <inbound> <set-variable name="starttime" value="@(DateTime.UtcNow.ToString("r"))" /> <set-header name="Policy-Execution-TimeStamp" exists-action="append"> <value>@((string)context.Variables["starttime"])</value> </set-header> </inbound> hope this helps! do let me know incase of further queries, I would be happy to assist you.

how do I use set-header with a datetime variable

Accepted answer

JananiRamesh-MSFT 27,751 Reputation points

2024-08-08T05:10:08.3033333+00:00
@Martin Kallukalam Thanks for reaching out please refer the below policy snippet

<inbound> <set-variable name="starttime" value="@(DateTime.UtcNow.ToString("r"))" /> <set-header name="Policy-Execution-TimeStamp" exists-action="append"> <value>@((string)context.Variables["starttime"])</value> </set-header> </inbound>

hope this helps! do let me know incase of further queries, I would be happy to assist you.
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Martin Kallukalam 355 Reputation points

2024-08-08T10:57:48.0366667+00:00

@JananiRamesh-MSFT
the real intent is to set a header which carry the timedifference between two datetime stamp expressions (endtime and starttime), convert to string and assign it to variable.

<set-header name="Policy-Exec-Time" exists-action="append"> <value> @((string)(context.Variables["endtime"] - context.Variables["starttime"]))</value> </set-header>

I get an error :
Error in element 'set-header' on line 21, column 10: Operator '-' cannot be applied to operands of type 'object' and 'object'
I am not sure what this error is saying. Why is not allowing to substract two datetime variables to give another datetime variable

JananiRamesh-MSFT 27,751 Reputation points

2024-08-10T04:32:24.7033333+00:00

Martin Kallukalam please ensure that context.Variables["endtime"] and context.Variables["starttime"] are indeed DateTime objects before using this method. If they are not, you’ll need to convert them to DateTime first.

Martin Kallukalam 355 Reputation points

2024-08-10T05:13:44.01+00:00

@JananiRamesh-MSFT
below is the policy xml
endtime and starttime are Datetime objects. Not sure what I am doing wrong here, both objects seems to be datetime object

When I try to save it, gives me error (attached)

<set-variable name="starttime" value="@(DateTime.UtcNow)" /> <retry condition="@(true)" count="1" interval="2" /> <set-variable name="endtime" value="@(DateTime.UtcNow)" /> <set-header name="Policy-Exec-Time" exists-action="append"> <value> @((string)(context.Variables["endtime"] - context.Variables["starttime"]))</value> </set-header>
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