CS8604 Possible null reference argument for parameter 's' in 'int int.Parse(string s)'.

Question

CS8604 Possible null reference argument for parameter 's' in 'int int.Parse(string s)'.

Asjad Butt 71

Hi the base is not explain able but im using name identifier of claims principal to get user id so i convert it to int user parse operation now its giving a null reference warning as follows: Possible null reference argument for parameter 's' in 'int int.Parse(string s)'.
now when i call this method in post postman i get an Input string was not in a correct format. error.
ill provide the controller with and the repositories the have the methods

the repository interface
the repository implementation

Anonymous

2022-09-24T07:15:55.367+00:00

Hi @Asjad Butt ,

The issue might relate the above value, try to set a breakpoint to check the User claims, and define a variable store the NameIdentifier claim value, whether it is a valid int value?
Asjad Butt 71 Reputation points

2022-09-24T07:26:28.997+00:00

im not getting anything back the like id reurns 0 which is the null of integer in another function i have the same claim principal but with simple string return type and it returns the valid value

1 answer

Your answer

Anonymous

2022-09-24T07:15:55.367+00:00

Hi @Asjad Butt ,

The issue might relate the above value, try to set a breakpoint to check the User claims, and define a variable store the NameIdentifier claim value, whether it is a valid int value?
Asjad Butt 71 Reputation points

2022-09-24T07:26:28.997+00:00

im not getting anything back the like id reurns 0 which is the null of integer in another function i have the same claim principal but with simple string return type and it returns the valid value

Answer 1

Asjad Butt 71

i can refactor the question as the likedid is zero the claims principal return nothing

Anonymous

2022-09-24T08:08:37.143+00:00

the claims principal return nothing

You'd better to check the relates code about how to add the claims to the current User. You can refer my reply in this thread to check the claims.

Besides, you can try to use the Int32.TryParse Method to parse the value, if the value is converted successfully, you can get the valid id, if the convert fail, you can log the error or set a default value or return an custom error page.
Asjad Butt 71 Reputation points

2022-09-24T09:58:06.567+00:00

i have a little question can i set a string as a the primary key when adding migrations in ef core if so how
Anonymous

2022-09-26T06:49:34.797+00:00

i have a little question can i set a string as a the primary key when adding migrations in ef core if so how

If you are creating a new table based on the model, you can set a string as the primary key when adds migration using EF core.

But if you want to change the existed table's primary key, you will meet the To change the IDENTITY property of a column, the column needs to be dropped and recreated. error. The column needs to be dropped and recreated, or you have to recreate the table.

Share via

CS8604 Possible null reference argument for parameter 's' in 'int int.Parse(string s)'.

1 answer

Your answer