Setting custom properties on an 365 group with GraphClient - microsoft-graph-api

Question

I want to set CustomProperty5 on a 265 group. I have following code:
var extensions = await graphClient.Groups["xxx"].Extensions.Request().GetAsync();
var dictionary = new Dictionary<string, object>();
dictionary.Add("CustomAttribute5", "Works!");
await graphClient
.Groups["xxx"]
.Request()
.UpdateAsync(new Microsoft.Graph.Group()
{
AdditionalData = dictionary
});
However I get following error:
Microsoft.Graph.ServiceException: 'Code: Request_BadRequest Message:
One or more property values specified are invalid.
Any pointers how to set custom properties on a 365 group?

Answer 1

For existing group open extension could be updated like this via msgraph-sdk-dotnet:
//retrieve an existing group custom property
var ext = await graphClient.Groups[groupId].Extensions[extName].Request().GetAsync();
//update
ext.AdditionalData = new Dictionary<string, object>()
{
{
"status", "Closed"
}
};
await graphClient.Groups[groupId].Extensions[extName]
.Request()
.UpdateAsync(ext);
When it comes to complex type extension, it could be updated via group update endpoint. Lets assume the following type extension is registered:
{
"id":"contoso_grpstatus",
"description": "",
"targetTypes": [
"Group"
],
"properties": [
{
"name": "Status",
"type": "String"
}
]
}
Then an existing group instance with the contoso_grpstatus complex type extension defined could be updated like this:
var group = new Group
{
AdditionalData = new Dictionary<string, object>()
{
{
"contoso_grpstatus", new Dictionary<string, object>()
{
{"Status", "Closed"}
}
}
}
};
await graphClient.Groups[groupId]
.Request()
.UpdateAsync(group);