CODEWITHSUNDEEP
c#
Ibanez1408
Ibanez1408

Reputation: 5078

Create a default value when no value is set into class properties

I have a class that has multiple properties. What I want to have is a value set to a particular property if there is no value passed to it. For instance, if txtFather.Text is blank, then the _theFather property of a class should have a default value of "N/A". Here is the code I have so far:

class StudentModel

private string _theFather = "N/A";

    public string SetFather
    {
        get { return _theFather; }
        set { _theFather = value; }
    }

public void InsertStudent(StudentModel student)
    {
        MessageBox.Show(_theFather);
    }

class AddStudent

private void button1_Click(object sender, EventArgs e)
    {
        var sm = new StudentModel()
        {
            SetFather = txtFathersName.Text
        };
        sm.InsertStudent(sm);
    }

If I place a value in the txtFather.Text, I get the its value in the StudentModel Class but if I leave the txtFather.Text blank, I don't get the "N/A" value. I just get a blank or no value at all. Thanks for your help.

Upvotes: 0

Views: 1045

Answers (2)

DeanOC
DeanOC

Reputation: 7282

I would encapsulate the logic within the StudentModel class by checking the value being passed to the setter, and only updating your backing field if the string is not null or whitespace.

 public string SetFather
    {
        get { return _theFather; }
        set { 
              if(!string.IsNullOrWhiteSpace(value)) 
              { 
                 _theFather = value; 
              }
            }
    }

This way you only have the logic in a single place. If you modify your class' consuming code, then you have to remember to change it everywhere.

Upvotes: 2

T-moty
T-moty

Reputation: 2797

You should set the property only if a string is typed, like this:

private void button1_Click(object sender, EventArgs e)
{
    var sm = new StudentModel();
    if (!string.IsNullOrEmpty(txtFathersName.Text))
        sm.SetFather = txtFathersName.Text;

    sm.InsertStudent(sm);
}

Upvotes: 0

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