ASP.NET Core 2.1 Use HttpContext in view
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: user@email.com
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.
c# asp.net linq asp.net-core asp.net-core-mvc
edited Nov 15 '18 at 3:45
Tetsuya Yamamoto
16.6k42241
asked Nov 15 '18 at 3:29
JianYAJianYA
5041128
add a comment |
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: user@email.com
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.
c# asp.net linq asp.net-core asp.net-core-mvc
edited Nov 15 '18 at 3:45
Tetsuya Yamamoto
16.6k42241
asked Nov 15 '18 at 3:29
JianYAJianYA
5041128
Is it should be@Context.User.Claims.Where(u => u.Type == "UserName").Select(c => c.Value).SingleOrDefault()?
– Tetsuya Yamamoto
Nov 15 '18 at 3:37
add a comment |
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: user@email.com
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.
c# asp.net linq asp.net-core asp.net-core-mvc
edited Nov 15 '18 at 3:45
Tetsuya Yamamoto
16.6k42241
asked Nov 15 '18 at 3:29
JianYAJianYA
5041128
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: user@email.com
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.
c# asp.net linq asp.net-core asp.net-core-mvc
c# asp.net linq asp.net-core asp.net-core-mvc
edited Nov 15 '18 at 3:45
Tetsuya Yamamoto
16.6k42241
asked Nov 15 '18 at 3:29
JianYAJianYA
5041128
edited Nov 15 '18 at 3:45
Tetsuya Yamamoto
16.6k42241
asked Nov 15 '18 at 3:29
JianYAJianYA
5041128
edited Nov 15 '18 at 3:45
Tetsuya Yamamoto
16.6k42241
edited Nov 15 '18 at 3:45
Tetsuya Yamamoto
16.6k42241
edited Nov 15 '18 at 3:45
Tetsuya Yamamoto
16.6k42241
16.6k42241
asked Nov 15 '18 at 3:29
JianYAJianYA
5041128
asked Nov 15 '18 at 3:29
JianYAJianYA
5041128
asked Nov 15 '18 at 3:29
JianYAJianYA
5041128
5041128
Is it should be@Context.User.Claims.Where(u => u.Type == "UserName").Select(c => c.Value).SingleOrDefault()?
– Tetsuya Yamamoto
Nov 15 '18 at 3:37
add a comment |
Is it should be@Context.User.Claims.Where(u => u.Type == "UserName").Select(c => c.Value).SingleOrDefault()?
– Tetsuya Yamamoto
Nov 15 '18 at 3:37
Is it should be
@Context.User.Claims.Where(u => u.Type == "UserName").Select(c => c.Value).SingleOrDefault()?– Tetsuya Yamamoto
Nov 15 '18 at 3:37
Is it should be
@Context.User.Claims.Where(u => u.Type == "UserName").Select(c => c.Value).SingleOrDefault()?– Tetsuya Yamamoto
Nov 15 '18 at 3:37
add a comment |
2 Answers
2
active
oldest
votes
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
answered Nov 15 '18 at 3:41
Tetsuya YamamotoTetsuya Yamamoto
16.6k42241
add a comment |
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
answered Nov 15 '18 at 3:53
Danny ChenDanny Chen
30.5k1586139
add a comment |
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
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
answered Nov 15 '18 at 3:41
Tetsuya YamamotoTetsuya Yamamoto
16.6k42241
add a comment |
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
answered Nov 15 '18 at 3:41
Tetsuya YamamotoTetsuya Yamamoto
16.6k42241
add a comment |
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
answered Nov 15 '18 at 3:41
Tetsuya YamamotoTetsuya Yamamoto
16.6k42241
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
answered Nov 15 '18 at 3:41
Tetsuya YamamotoTetsuya Yamamoto
16.6k42241
edited Nov 15 '18 at 4:03
answered Nov 15 '18 at 3:41
Tetsuya YamamotoTetsuya Yamamoto
16.6k42241
answered Nov 15 '18 at 3:41
Tetsuya YamamotoTetsuya Yamamoto
16.6k42241
answered Nov 15 '18 at 3:41
Tetsuya YamamotoTetsuya Yamamoto
16.6k42241
16.6k42241
add a comment |
add a comment |
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
answered Nov 15 '18 at 3:53
Danny ChenDanny Chen
30.5k1586139
add a comment |
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
answered Nov 15 '18 at 3:53
Danny ChenDanny Chen
30.5k1586139
add a comment |
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
answered Nov 15 '18 at 3:53
Danny ChenDanny Chen
30.5k1586139
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
answered Nov 15 '18 at 3:53
Danny ChenDanny Chen
30.5k1586139
answered Nov 15 '18 at 3:53
Danny ChenDanny Chen
30.5k1586139
answered Nov 15 '18 at 3:53
Danny ChenDanny Chen
30.5k1586139
answered Nov 15 '18 at 3:53
Danny ChenDanny Chen
30.5k1586139
30.5k1586139
add a comment |
add a comment |
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Is it should be
@Context.User.Claims.Where(u => u.Type == "UserName").Select(c => c.Value).SingleOrDefault()?– Tetsuya Yamamoto
Nov 15 '18 at 3:37