microsoftgraph
MsGraph Todo $filter finishes with "Invalid request" error when has "contains(title, '&')" criteria
Describe the bug
My application needs to find all Todo Tasks that have & symbol in title field.
So application executes request with filtering criteria contains(title, '&'):
graphClient.Me.Todo.Lists[myListId].Tasks.GetAsync(rc => rc.QueryParameters.Filter = filter)
where filter is string "contains(title, '&')".
MsGraph SDK fires exception "invalidRequest" from server's JSON response:
{
"error": {
"code": "invalidRequest",
"message": "Invalid request",
"innerError": {
"code": "RequestBroker--ParseUri",
"date": "2025-08-12T10:04:15",
"request-id": "4c70fb4e-18c5-4725-859f-4dfc99e9adcd",
"client-request-id": "97fa3a5b-08ca-46dd-bdfd-784341a5a308"
}
}
}
Expected behavior
MsGrpah SDK should return tasks that are filtered according criteria
How to reproduce
use filter "contains(title, '&')"
SDK Version
5.73.0
Latest version known to work for scenario above?
No response
Known Workarounds
No response
Debug output
Click to expand log
```</details>
### Configuration
_No response_
### Other information
_No response_
Use double encoded ampersand
"contains(title, '%2526')"
Why? Where it's described in the documentation? What else symbols should be encoded in special way?
@23W https://learn.microsoft.com/en-us/graph/query-parameters?view=graph-rest-1.0&tabs=http#encoding-query-parameters
@23W https://learn.microsoft.com/en-us/graph/query-parameters?view=graph-rest-1.0&tabs=http#encoding-query-parameters
Do you mean this one?
This is note about $search param, my question is about $filter.
The note about $search param, but applies also to $filter.
Have you tried double encoded ampersand "contains(title, '%2526')"? Does it work for you.
The note about
$searchparam, but applies also to$filter.Have you tried double encoded ampersand
"contains(title, '%2526')"? Does it work for you.
Have not tried yet. I decided to do filtering work locally.