Size property has an invalid size of 0

Question

I am working on a social network, one of my procedures returns a VARCHAR output. So this is what I wrote:

SqlParameter job1 = cmd2.Parameters.Add("@job", SqlDbType.VarChar);
job1.Direction = ParameterDirection.Output;

However this error comes up:

String[1]: the Size property has an invalid size of 0.

Solution 1

You need to define a length when specifying the varchar parameter:

SqlParameter job1 = cmd2.Parameters.Add("@job", SqlDbType.VarChar, 50);

You should use the same length as defined in your SQL Server stored procedure.

And btw: if your stored procedure also has no length defined (something like @job VARCHAR OUTPUT) - then you've defined a varchar string of 1 character length ......

Solution 2

If you are using Dapper, you have passed in a null value for the parameter, where the expected input was a string.

To find the offending value and it's parameter, inspect at the Dapper DynamicParameters object during a debug session and open the parameters being index referred to.

Comments

[Chillin']

I have a question because I have the same exception...if the column is varchar, what is the danger of having varchar in your SP and code using DbType.AnsiString

[thalacker]

It is known as the "Size" attribute in case you need to specify it like I did