Oracle Database Insert data error: ORA-06550

WPF app calls Oracle's stored procedure with error "ORA-06550: Number of arguments or wrong parameter type", such as:

Repeated checks, the parameters of the stored procedure and the type of parameters are correct, feel very strange. Finally finally solved,

The reason is to pass in DBNull.Value when the value of the parameter is null, such as:

Summarize:

In the case of a SQL Server database, the field is nullable, and when the passed-in parameter is NULL, the pass-through value can be successfully inserted into the database.

However, the Oracle database, the incoming parameter is NULL, you need to pass in DBNull.Value, such as:

Oracle Database Insert data error: ORA-06550