Parameter inside curly bracket

Maha

Originally this was a program with three-parameter constructor (parameter inside the round bracket) and executed well.

Student oneSophomore = new Student(951, "Ross", 3.5);

For curiosity I modified the program and placed the three-parameter inside the curly bracket. After that program is not executing. What corrections have to be done to execute the program.

Student oneSophomore = new Student(){idNumber=951, lastName="Ross", gradePointAverage=3.5};

using System;

public class CreateStudent_byMaha

{

public static void Main()

{

//Student oneSophomore = new Student(951, "Ross", 3.5);

Student oneSophomore = new Student(){idNumber=951, lastName="Ross", gradePointAverage=3.5};

Console.WriteLine

("The student named {0} has ID # is {1} and a gpa of {2}", oneSophomore.Name, oneSophomore.Id, oneSophomore.GPA);

Console.ReadKey();

}

class Student

{

private int idNumber;

private string lastName;

private double gradePointAverage;

public Student(int idNumber, string lastName, double gradePointAverage)

{

this.idNumber = idNumber;

this.lastName = lastName;

this.gradePointAverage = gradePointAverage;

}

public int Id

{

get { return idNumber; }

}

public string Name

{

get { return lastName; }

}

public double GPA

{

get { return gradePointAverage; }

}

//The student named Ross has ID # is 951 and a gpa of 3.5

10 Replies

Know the answer? Post it — somebody with the same question will find it here.

Rajesh Singh10y ago
Accepted answer
Hi Maha,
I corrected the code and pasted below.
Problem is mention below:
1. You were not setting value of property. I mean setter is required.
2. Parameterized constructor is not required since you are not passing any parameter.
3. If you want to keep parametarized constructor then put default constructor also.

Please let me know if you need any other clarifications.

using System;
public class CreateStudent_byMaha
{
public static void Main()
{
//Student oneSophomore = new Student(951, "Ross", 3.5);
Student oneSophomore = new Student() { Id = 951, Name = "Ross", GPA = 3.5 };
Console.WriteLine
("The student named {0} has ID # is {1} and a gpa of {2}", oneSophomore.Name, oneSophomore.Id, oneSophomore.GPA);
Console.ReadKey();
}
}
class Student
{
private int idNumber;
private string lastName;
private double gradePointAverage;
//Not required since you are not passing any parameter
//public Student(int idNumber, string lastName, double gradePointAverage)
//{
// this.idNumber = idNumber;
// this.lastName = lastName;
// this.gradePointAverage = gradePointAverage;
//}
public int Id
{
get { return idNumber; }
//You need to Set value
set
{
idNumber = value;
}
}
public string Name
{
get { return lastName; }
//You need to Set value
set
{
lastName = value;
}
}
public double GPA
{
get { return gradePointAverage; }
//You need to Set value
set
{
gradePointAverage = value;
}
}
}
Rajesh Singh10y ago
Thank you Maha.
Maha10y ago
Rajesh Singh, Thank you for your explanation.

Jignesh Trivedi, you are also telling same thing but not in detail.

Rupali Shinde, your method is not executing also if fields are made public concept of information hiding is lost.

Sujeet Suman your method is not executing. Please tried to produce a complete program.
Sujeet Suman10y ago
Maha as per my understanding you can achieve your requirement through below process:

Create a default constructor like below:

public Student()
{
   this.idNumber = idNumber;
   this.lastName = lastName;
   this.gradePointAverage = gradePointAverage;
}

If this is helpful for you them please accept my Answer.
Rupali Shinde10y ago
Hi Maha,

you need below modification at Student class ..
1. Make variable as public.
2. Add empty constructor

public class Student
{
public int idNumber;
public string lastName;
public double gradePointAverage;
public Student() { }
public Student(int idNumber, string lastName, double gradePointAverage)
{
this.idNumber = idNumber;
this.lastName = lastName;
this.gradePointAverage = gradePointAverage;
}
public int Id { get { return idNumber; } }
public string Name { get { return lastName; } }
public double GPA { get { return gradePointAverage; } }
}

Page_Load code as follow:

protected void Page_Load(object sender, EventArgs e)
{
//Student oneSophomore = new Student(951, "Ross", 3.5);
Student oneSophomore = new Student() { idNumber = 951, lastName = "Rupali Shinde", gradePointAverage = 3.5 };
txtidNumber.Text = oneSophomore.idNumber.ToString();
txtlastName.Text = oneSophomore.lastName.ToString();
txtgradePointAverage.Text = oneSophomore.gradePointAverage.ToString();
}
If it works out, Please Accept this as Answer
Jignesh Trivedi10y ago
Hi,
You can use curly bracket to assign class properties.

In your code, there are readonly properties and assign by constructor.

to resolved the error you need make these properties read/write by adding set.

for example

public string Name
{
get { return lastName; }
set { lastName = value;}
}

these need to done with all properties and also you need to create parameter less constructor for the class.

hope this will help you.
Ranjit Powar10y ago
Change your code like this
1. Add constructor with 0 parameters in Student class
public Student(){}

2. Create object as below
Student oneSophomore = new Student{idNumber=951, lastName="Ross", gradePointAverage=3.5};
Ranjit Powar10y ago
I think your syntax is right. What error you got?
Maha10y ago
There is a method like this but I couldn't remember.
Ranjit Powar10y ago
What you are trying to do. In C # if you call method you should provide parameters in parentheses. I don't think so that there is any way to pass parameters as you do.