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21 mar 2012 · You can use DBNull.Value when you need to pass NULL as a parameter to the stored procedure. param.Value = DBNull.Value; Or you can use that instead of your if operator: param.Value = !string.IsNullOrEmpty(activity.StaffId) ? activity.StaffId : (object)DBNull.Value;
16 maj 2016 · You need pass DBNull.Value as a null parameter within SQLCommand, unless a default value is specified within stored procedure (if you are using stored procedure). The best approach is to assign DBNull.Value for any missing parameter before query execution, and following foreach will do the job.
Learn about how the .NET Framework Data Provider for SQL Server handles null, and read about null and SqlBoolean, three-valued logic, and assigning null values.
10 paź 2016 · The most terse and declarative way to write this is to use C#'s ?? operator. Your line becomes: new SqlParameter("@Price", (object)items.Price ?? DbNull.Value), The expression here will either return the non-null value of the left operand (items.Price), or return the operand to the right instead.
7 sie 2024 · Handling nullable values when working with SQLParameter in C# is essential for building robust and secure database applications. By understanding nullable types in C# and how to handle them effectively with SQLParameter, you can ensure that your database interactions are safe and reliable.
9 sty 2021 · The following generic extension method(s) encapsulates checking if a column is null with SqlDataReader.IsDBNull() and uses the generic SqlDataReader.GetFieldValue() to read the value. It returns the object casted to the proper type, or it returns the type’s default value (which is null for nullable types):
7 paź 2019 · If you want you’re stored procedure to accept nulls then you first need to specify this in your input variables. create procedure sp__set_completed ( @id int, @completed bit = null ) as update product set completed = @completed where id = @id go
