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DTO and properties

DTO and properties

DTO and properties

I have my own data types for use with a database that have various properties to manipulate values such as:

Data: current value
First: original value
IsNull: is the current state null (no value in Data)
IsFirstNull: was the initial state of the object null
Changed: has the value changed since the initial value was set.
SetNull(): set the object to null
SetFirstNull: set the initial value to null
Reset: set values all to original settings.

Each one of the objects has these. There is an object for each type of standard variables, such as:

int – IntType
string – StringType
bool – BoolType

These would go in my DTO.

I set up these types to handle the different states of each variable I read from a table as well as handle nulls. It was always hard to tell whether a value was null or not or whether it was null when the value was originally read so I would know how to write it back or whether the value was changed. Sometimes you need to know what the original value was when you read the data from the table.

So I only use these for data I have read from my tables.

I wanted to put them in a DTO but can’t decide whether to set up properties to access these variables or to access them directly. Here is a sample of a DTO (with properties):


public class LoginDTO
    public IntType loginID = new IntType();
    public StringType userName = new StringType();

    #region Properties

    public object LoginID
            object value = null;
            return NullHandler.SetDbObjectValueFromValue(loginID, ref value);
            NullHandler.GetValueFromDbObject(value, ref loginID);

    public object UserName
            object value = null;
            return NullHandler.SetDbObjectValueFromValue(userName, ref value);
            NullHandler.GetValueFromDbObject(value, ref userName);

To access the class, I could do something like

if (loginDto.userName.IsNull)…

I can’t really set up a property to UserName.IsNull (I don’t think) where I would just return username.IsNull.

Seems like setting up properties is a little overkill since I already have the properties setup inside the objects with their own memory variables.

But not sure if that would be against rules of using a DTO.

Just trying to get some opinions on this as I am setting up templates to build my DTO’s and want to standardize them.



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