Download Item Attchment using Graph client API

Question

How Can I download item attachment using graph client API in my .NET core app?

Answer 1

Are you looking for a ready to use code or? Generally speaking, you use the /messages/{item-id}/attachments/{attach-id}/$value endpoint, as detailed here: https://learn.microsoft.com/en-us/graph/api/attachment-get?view=graph-rest-1.0&tabs=http

Answer 2

With MS Graph Explorer i would try like this:

https://graph.microsoft.com/v1.0/me/messages/AAMkAGRlNWM4Njk4LWY3NTYtNGE2MC05ZjQzLTg1YmM5YjIzNTRhMwBGAAAAAAA-L78mmzKFQ7FpvCcWkAziBwCUgufVfU8cSKxkYzIkrl81AAAAAAEMAACUgufVfU8cSKxkYzIkrl81AACPpiPUAAA=/attachments/AAMkAGRlNWM4Njk4LWY3NTYtNGE2MC05ZjQzLTg1YmM5YjIzNTRhMwBGAAAAAAA-L78mmzKFQ7FpvCcWkAziBwCUgufVfU8cSKxkYzIkrl81AAAAAAEMAACUgufVfU8cSKxkYzIkrl81AACPpiPUAAABEgAQAHuvC2KF7iBGiNpH9HGIZ8k=/  
  

If it's GraphClient i would try like this (adding the code sample):

GraphServiceClient graphClient = new GraphServiceClient( authProvider );  
  
var attachment = await graphClient.Me.Messages["AAMkAGRlNWM4Njk4LWY3NTYtNGE2MC05ZjQzLTg1YmM5YjIzNTRhMwBGAAAAAAA-L78mmzKFQ7FpvCcWkAziBwCUgufVfU8cSKxkYzIkrl81AAAAAAEMAACUgufVfU8cSKxkYzIkrl81AACPpiPUAAA="].Attachments["AAMkAGRlNWM4Njk4LWY3NTYtNGE2MC05ZjQzLTg1YmM5YjIzNTRhMwBGAAAAAAA-L78mmzKFQ7FpvCcWkAziBwCUgufVfU8cSKxkYzIkrl81AAAAAAEMAACUgufVfU8cSKxkYzIkrl81AACPpiPUAAABEgAQAHuvC2KF7iBGiNpH9HGIZ8k="]  
	.Request()  
	.GetAsync();  

Result:
This will get me the content byte from the item attachment (adding a snapshot):

Hope this helps.