How to Handle 'Cannot Implicitly Convert DBNull to Int' Errors in C#?

Cannot implicitly convert DBNull to Int?

Error in code snippet: "Cannot implicit convert from DBNull to int". This is due to the nature of the ?: operator, as it requires that the expressions it evaluates are of the same type.

In this example, the first expression (AgeItem.AgeIndex) is an integer, while the second expression (DBNull.Value) is of type DBNull. These types are incompatible, causing errors.

Solution: cast to object or use null coalescing operator

To resolve this issue, you have two options:

• Cast to object: Cast AgeItem.AgeIndex to object type, which can accommodate integers and DBNull values:

SqlParameter[] parameters = new SqlParameter[1];     
SqlParameter planIndexParameter = new SqlParameter("@AgeIndex", SqlDbType.Int);
planIndexParameter.Value = (object)AgeItem.AgeIndex ?? DBNull.Value;
parameters[0] = planIndexParameter; 

• Use the null coalescing operator (??): ??The null coalescing operator returns the value of the first expression if the first expression is not null. is null, returns the value of the second expression. This can be used to assign DBNull.Value when AgeItem.AgeIndex is null:

SqlParameter[] parameters = new SqlParameter[1];     
SqlParameter planIndexParameter = new SqlParameter("@AgeIndex", SqlDbType.Int);
planIndexParameter.Value = AgeItem.AgeIndex ?? DBNull.Value;
parameters[0] = planIndexParameter; 

These solutions allow you to assign an integer or DBNull.Value to a SqlParameter without encountering any type conversion errors.

The above is the detailed content of How to Handle 'Cannot Implicitly Convert DBNull to Int' Errors in C#?. For more information, please follow other related articles on the PHP Chinese website!