How to do a POST batch request in Miscrosoft Graph .NET SDK - microsoft-graph-api

Question

I'm trying to do a batch request using MS Graph .NET SDK as shown here: https://learn.microsoft.com/en-us/graph/sdks/batch-requests?tabs=csharp
The only problem is that when I run the code, nothing happens.
I'm trying to move a set of emails (stored in a list) to another mail folder.
Am I missing anything?
The move request is here https://learn.microsoft.com/en-us/graph/api/message-move?view=graph-rest-1.0&tabs=http
When used in a single query it works, but not when batching.
Below you will find the code, in this case I'm looping to 20 just to test as 20 is the maximum queries per batch.
Thanks in advance.
for (int i = 0; i < 20; i++)
{
var mail = invalidMessages[i];
var userRequest = client.Me.Messages[mail.Id]
.Move(failureFolderID)
.Request();
requestID = batchRequestContent.AddBatchRequestStep(userRequest);
}
var returnedResponse = await client.Batch.Request().PostAsync(batchRequestContent);
EDIT: I tried to change the method to POST
userRequest.Method = System.Net.Http.HttpMethod.Post;
but I get a ServiceException: 'Code: BadRequest
Message: Write request id : fe23b1c1-663d-4499-829a-291d04a12b48 does not contain Content-Type header or body.'

Answer 1

The Microsoft Graph message-move API call you are attempting to use is a POST request
The Microsoft Batch API handles POST requests differently than the other API methods.
As per https://learn.microsoft.com/en-us/graph/sdks/batch-requests?tabs=csharp
POST requests are handled a bit differently.
The SDK request builders generate GET requests, so
you must get the HttpRequestMessage and convert to a POST
To have a successful post with the batch API you need to
Create an HttpRequestMessage
provide a value for the HttpRequestMessage's Content property which houses the POST requests payload
So if I applied this to your code I would first create a class to represent the POST payload for the message-move API. As per https://learn.microsoft.com/en-us/graph/api/message-move?view=graph-rest-1.0&tabs=http
the POST API has one property called destinationId
destinationId - The destination folder ID, or a well-known folder name. For a list of supported well-known folder names, see mailFolder resource type.
public class MailMovePayload
{
public string destinationId { get; set; }
}
then I would use an instance of this class in this modified version of you code
string str = events.Content.ReadAsStringAsync().Result;
events.Method = HttpMethod.Post;
for (int i = 0; i < 20; i++)
{
var mail = invalidMessages[i];
//get the request message object from your request
var userRequestMessage = client.Me.Messages[mail.Id]
.Move(failureFolderID)
.GetHttpRequestMessage();
//set the message API method
userRequestMessage.Method = HttpMethod.Post;
//create the payload, I am assuming failureFolderID is
//the name of the folder where the mail will be moved to
var payloadData = new MailMovePayload { destinationId = failureFolderID };
//make the JSON payload for the request message
userRequestMessage.Content = new StringContent(JsonConvert.SerializeObject(payloadData), Encoding.UTF8, "application/json")
requestID = batchRequestContent.AddBatchRequestStep(userRequestMessage);
}
var returnedResponse = await client.Batch.Request().PostAsync(batchRequestContent);
return httpRequestMessage;
}