I have the following in my Angular service:
this.$http.delete<void>(ApiDomain.superPlan, `/v1/Attendance?resultEventId=${resultEventId}&dueEventId=${dueEventId}`)
And this is the signature of the C# method being called:
[HttpDelete(),
public async Task<IActionResult> Delete(string resultEventId, string dueEventId)
The dueEventId passed in is sometimes null. Yet in the C# method, its value is "null" instead of null. How do I pass the actual null value?
When JavaScript is concatenating strings, if it comes across null it will insert "null" into the given string.
console.log(`/v1/Attendance?resultEventId=${1}&dueEventId=${null}`);
// output: /v1/Attendance?resultEventId=1&dueEventId=null
To avoid that, you can avoid including the dueEventId query parameter at all if its value is null. Or leave the value empty: ASP.NET Core will interpret an empty string as null, as pointed out by Heretic Monkey in the comments.
dueEventId=), as described in the duplicate.Rewrite to ommit param with null value
let params=new HttpParams().append("resultEventId",""+resultEventId})
if(dueEventId){
params=params.append("dueEventId",""+dueEventId);
}
this.$http.delete<void>(ApiDomain.superPlan, `/v1/Attendance`,{params});
otherwise you are sending dueEventId="null" which is exactly what you observe.
