如何在ADO.Net中潜在地将null作为参数传递

Question

I'm trying to pass a parameter into a stored proc using ADO.NET. This paramater is of type int but the field in the database is nullable. Here's my code:

AddInParameter(cmd, "@i_Required_License_List_PKID", DbType.Int32, RequiredLicenseListPkid==""? null : Convert.ToInt32(RequiredLicenseListPkid);

When I do this I get an error saying that there's no conversion between null and int.

I have also tried DbNull.Value in place of null but with the same result.

I can't seem to find any nullable parameter types in the DbType class but I wonder is that the solution.

Answer 1

Use: DBNull.Value;

as the value of the parameter

Answer 2

AddInParameter（cmd，“ @i_Required_License_List_PKID”，DbType.Int32，RequiredLicenseListPkid ==“”？DBNull.Value：Convert.ToInt32（RequiredLicenseListPkid）;