I have this httpcontext claim that I would like to use in my view to show the current users username. This is how I do it so far:
<p>@Context.User.Claims.SingleOrDefault(u => u.Type == "UserName")</p>
However, the result is something like this:
UserName: [email protected]
Am I missing something? I tried to do this:
@Context.User.Claims.SingleOrDefault(u => u.Type == "UserName").Select(c => c.Value).SingleOrDefault()
But it doesn't allow me to use Select after the SingleOrDefault.
The SingleOrDefault() returns single element that matches with the criteria, not another IQueryable or IEnumerable collection which can be Select-ed later.
Returns a single, specific element of a sequence, or a default value if that element is not found.
You should use Where() to return a collection before using Select():
@Context.User.Claims.Where(u => u.Type == "UserName").Select(c => c.Value).SingleOrDefault()
For C# 6.0 and above, use null-conditional operator to get its value:
@Context.User.Claims.SingleOrDefault(u => u.Type == "UserName")?.Value
However, the result is something like this:
Because .SingleOrDefault returns a claim item, then the view renders the item with its .ToString method.
But it doesn't allow me to use Select after the SingleOrDefault.
.SingleOrDefault returns a item in the collection, while .Select expects a collection. You should just visit the .Value property of this item directly.
@Context.User.Claims.SingleOrDefault(u => u.Type == "UserName")?.Value
@Context.User.Claims.Where(u => u.Type == "UserName").Select(c => c.Value).SingleOrDefault()?