How to retain old value when setting variable on c# class

Question

I want to create a class that can set multiple value and not delete the old one that was set already, instead add it and the old value. Here is my sample.

myClass myCls = new myClass();

myCls.setString = "My first string!";
myCls.setString = "My second string!";
myCls.setString = "My third string!";
string printMe = myCls.getString();

Console.WriteLine(printMe);

And when it will output something like;

//My first string!My second string!My third string!

you can't unless you store old value somewhere – Selman Genç Jun 26 '14 at 19:09 — Selman Genç, Jun 26 '14 at 19:09
@Selman22 yes you can. you can append to the string ... – clcto Jun 26 '14 at 19:10 — clcto, Jun 26 '14 at 19:10

score 1 · Answer 1 · answered Jun 26 '14 at 19:15

You can try with this class:

public class ValueKeeper {

    private List<object> values;

    public object Value {
        get { return ToString(); }
        set { values.Add(value); }
    }

    public ValueKeeper() {
        values = new ArrayList<object>();
    }

    public override string ToString() {
        string result = String.Empty;
        foreach(object value in values) result += value.ToString();
        return result;
    }
}

It can be improved of course, but it would satisfy your needs.

Example

ValueKeeper valueKeeper = new ValueKeeper();

valueKeeper.Value = 1;
valueKeeper.Value = "This is a string";
valueKeeper.Value = someCustomObject;

string str = valueKeeper.Value;
Console.WriteLine(str); //PRINTS OUT "1This is a stringxxxxx"
                        //Where "xxxx" is the string representation of the custom object

score 1 · Accepted Answer · answered Jun 26 '14 at 19:15

One way to do it would be to have a new property on your myClass

public class myClass
{
    private string _setString;
    public string setString 
    {
            get
            {
                 return _setString;
             }
            set
            {
                 AuditTrail +=  value;
                 _setString = value;
            }
    }

    public string AuditTrail{get;set;}

}

Then in your main method you'd put:

Console.WriteLine(AuditTrail);

Dom · Answer 3 · 2014-06-26T19:17:32.297

0

string _entry;
public string Entry
{
    get { return _entry; }
    set { _entry += value; }
}

edited Jun 26 '14 at 19:17

answered Jun 26 '14 at 19:09

Dom

716
4
11

score 0 · Answer 4 · answered Jun 26 '14 at 19:14

You can create class like this.

class MyClass
{
   private string myString;
   public string MyString
   {
    get
     {
       return myString;
     }
    set
     {
       myString += value;
     }
    }
 }

In you Program you can use like this

MyClass c = new MyClass();
c.MyString = "String 1";
c.MyString = "String 2";
Console.WriteLine(c.MyString);

score 0 · Answer 5 · answered Jun 26 '14 at 19:14

0

This seems like an odd request but it can be done!

 class myClass
    {
        //Properties
        private string privateString;

        //Constructor
        public myClass()
        {

        }

        //Methods
        public void setString(string val)
        {
            privateString += val;
        }

        public string getString()
        {
            return privateString;
        }

    }

answered Jun 26 '14 at 19:14

Nick H.

1,608
14
19

3

Downvoted without a comment as to why? Where did this world go wrong!? – Nick H. Jun 26 '14 at 19:39
2

Your answer is of equal quality to every other answer, none include any kind of explanation. I wouldn't have downvoted it though. – BradleyDotNET Jun 27 '14 at 00:20

How to retain old value when setting variable on c# class

5 Answers5

Example

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