strange error in razor

Question

I have this:

<tr class="@(item.Id == (int)(Session["Id"] ?? 0) ? 
   "sfs-selected sfs-selectable" : String.Empty)">

but I get this meesage:

operator '==' cannot be applied to operands of type 'method group' and 'int'

but I already cast to int.

If I do this:

 <tr class="@if (item.Id == (string)(Session["id"] )) {@("sfs-selected sfs-selectable") } @string.Empty ">

then I get this error:

Unable to cast object of type 'System.Int32' to type 'System.String'.

So how to check on null value?

Thank you

if I do this:

 <tr class="@(item.Id == (Session["Id"] ?? 0) ? "sfs-selected sfs-selectable" : String.Empty)">

I get this warning:

Warning as Error: Possible unintended reference comparison; to get a value comparison, cast the right hand side to type 'string'

So I do this:

<tr class="@(item.Id == (string)(Session["Id"] ?? 0) ? "sfs-selected sfs-selectable" : String.Empty)">

then I get this:

Unable to cast object of type 'System.Int32' to type 'System.String'.

It seems like razor means item.Id is a method group

greenhoorn
– greenhoorn

2015-07-08 09:08:44 +00:00
Commented Jul 8, 2015 at 9:08 — greenhoorn
– greenhoorn, Commented Jul 8, 2015 at 9:08
Can you put the full view?

Ala
– Ala

2015-07-08 09:09:03 +00:00
Commented Jul 8, 2015 at 9:09 — Ala
– Ala, Commented Jul 8, 2015 at 9:09
public string Id { get; set; }

InfinityGoesAround
– InfinityGoesAround

2015-07-08 09:11:26 +00:00
Commented Jul 8, 2015 at 9:11 — InfinityGoesAround
– InfinityGoesAround, Commented Jul 8, 2015 at 9:11
What's the value of item.Id?

greenhoorn
– greenhoorn

2015-07-08 09:12:39 +00:00
Commented Jul 8, 2015 at 9:12 — greenhoorn
– greenhoorn, Commented Jul 8, 2015 at 9:12

Jitendra Pancholi · Accepted Answer · 2015-07-09 06:44:14Z

5

You should either remove (int) type cast or make Id as int. see this fiddle.

https://dotnetfiddle.net/1LmsTm // Showing Error

https://dotnetfiddle.net/ka4Y59 // Changing ID to int from string

https://dotnetfiddle.net/LhsiM3 // removing int from type cast with ID as string

edited Jul 9, 2015 at 6:44

answered Jul 8, 2015 at 9:14

Jitendra Pancholi

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7 Comments

InfinityGoesAround Over a year ago

Hi Jitendra, but your first example is still giving an error with string as id. And also with the cast in it.

Jitendra Pancholi Over a year ago

Yes, In that I am showing that if you take Id as string it's gives error, so you have to change it to int which is in second example.

Jitendra Pancholi Over a year ago

I added one more fiddle with Id taking as string. Have a look & let me know.

InfinityGoesAround Over a year ago

Hi Jitendra, yes, thank you. But see my post. I had that

InfinityGoesAround Over a year ago

I get then the following error: Unable to cast object of type 'System.Int32' to type 'System.String'.

|

Ronald Meijboom · Accepted Answer · 2015-07-08 09:09:39Z

2

The Id in item is a string and that is why you get this message. Remove the cast of the int or change the type of Id to int.

answered Jul 8, 2015 at 9:09

Ronald Meijboom

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4 Comments

greenhoorn Over a year ago

If it were a string the error message would be "[...] to operands of type 'string' and 'int' [...]"

user1666620 Over a year ago

@greenhoorn in the comments the OP identifies it as a string.

greenhoorn Over a year ago

Yes, sorry. I wrote the comment before he did :D

InfinityGoesAround Over a year ago

I Edit the the post> I removed the cast

BSG · Accepted Answer · 2016-04-28 07:01:59Z

2

If you do not want to make id as int then change like this and try

(item.Id == (Session["Id"].ToString() ?? "0") ?

edited Apr 28, 2016 at 7:01

answered Jul 8, 2015 at 9:14

BSG

1,96815 silver badges21 bronze badges

1 Comment

BSG Over a year ago

remove the semicolon and try again I just posted the sample code. please modify according to your requirement.

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