I started out programming with C# a few days ago.
Now an confusing error arised when playing around with operator overloading.
The following code produces a StackOverflowException when running:
using System;
namespace OperatorOverloading
{
public class Operators
{
// Properties
public string text
{
get
{
return text;
}
set
{
if(value != null)
text = value;
else
text = "";
}
}
// Constructors
public Operators() : this("")
{
}
public Operators(string text)
{
// Use "set" property.
this.text = text;
}
// Methods
public override string ToString()
{
return text;
}
// Operator Overloading
public static string operator +(Operators lhs, Operators rhs)
{
// Uses properties of the passed arguments.
return lhs.text + rhs.text;
}
public static void Main(string[] args)
{
Operators o1 = new Operators();
Operators o2 = new Operators("a");
Operators o3 = new Operators("b");
Console.WriteLine("o1: " + o1);
Console.WriteLine("o2: " + o2);
Console.WriteLine("o3: " + o3);
Console.WriteLine();
Console.WriteLine("o1 + o2: " + (o1 + o2));
Console.WriteLine("o2 + o3: " + (o2 + o3));
}
}
}
I tried to write an own example after reading the chapter about operater overloading from the book "Microsoft Visual C# 2008" from Dirk Louis and Shinja Strasser.
Maybe someone has a clue what's going wrong.
Thanks.
The get code-block in your class has the problem and that is what is causing the StackOverFlow exception.
public string text
{
get
{
return text;
}
}
Here when you say return text;
it will go and call the get block of the property text
itself which is causing the stack-overflow. wrap your property text around a private _txt string field and it should work properly.
You can make it something like this..
private string _txt;
public string text
{
get
{
return _txt;
}
set
{
_txt = string.IsNullOrEmpty(value) ? string.Empty : value;
}
}