Best method of assigning NULL value to SqlParameter

Question

I have a number of optional input parameters I am using in a C# class method. Since the optional syntax creates a value of \'0\' when the parameter is not used, the SQL inse

Answer 1

You'd need to check each parameter value and use DBNull.Value send null. We have an extension method off object to make this a little easier.

public static class ObjectExtensions
{
    public static object OptionalParam(this T value, T optionalValue = default(T))
    {
        return Equals(value,optionalValue) ? (object)DBNull.Value : value;
    }
}

Usage:

var sqlInput = new SqlParameter("@itemsRead", input.OptionalParam());

Or if you want to consider a non-default, arbitrary value as the default value:

var sqlInput = new SqlParameter("@itemsRead", input.OptionalParam(-1));