I want to create a class that can keep a number between to values. Here for I have created my first two generic classes.
The first called LimitRang and keep two limit rang variables; one for the lower rang and for the top rang. The second called NumberLimitRang and keep the number and the first class LimitRang.
When I try to create the variable mvarRang, how is a LimitRang var, in the constructor of NumberLimitRang I receive the error : 'Cannot implicitly convert type 'VariableTypes.Supplement.LimitRang' to 'T'.
My code for LimitRang:
namespace VariableTypes.Supplement
{
/// <summary>
/// Manage the boundaries for a number.
/// </summary>
/// <typeparam name="T">The numberic type for the limit parameters</typeparam>
public class LimitRang<T> where T : IComparable
{
private T mvarLowestLimitNumber;
private T mvarHighestLimitNumber;
/// <summary>
/// The default constructor (between 0 and 100)
/// </summary>
public LimitRang()
{
if (Functions.IsNumericType(typeof(T)))
{
try
{
mvarLowestLimitNumber = (T)Convert.ChangeType(0, typeof(T));
mvarHighestLimitNumber = (T)Convert.ChangeType(100, typeof(T));
}
catch
{
mvarLowestLimitNumber = default(T);
mvarHighestLimitNumber = default(T);
}
}
}
}
}
My code for NumberLimitRang:
namespace VariableTypes
{
/// <summary>
/// Can contain a number that need to be between or equal to two limit numbers
/// </summary>
public class NumberLimitRang<T> where T : IComparable
{
private Supplement.LimitRang<T> mvarRang;
private T mvarNumber;
/// <summary>
/// The default constructor (between 0 and 100/Number = 0)
/// </summary>
public NumberLimitRang(T mvarRang)
{
mvarRang = new Supplement.LimitRang<T>();
mvarNumber = (T)Convert.ChangeType(0, typeof(T));
}
}
}
Even when I replace the two T's into int, I still receive the error:
- private Supplement.LimitRang<int> mvarRang;
- mvarRang = new Supplement.LimitRang<int>();
Can you tell me what I do wrong?
Thx a lot
public NumberLimitRang(T mvarRang)
{
mvarRang = new Supplement.LimitRang<T>();
mvarNumber = (T)Convert.ChangeType(0, typeof(T));
}
The constructor takes a variable mvarRang
of type T
. This declaration hides the instance member mvarRang
of the type LimitRang<T>
.
Either change the parameter name, or refer to the instance member explicitly using this
:
public NumberLimitRang(T mvarRang)
{
this.mvarRang = new Supplement.LimitRang<T>();
mvarNumber = (T)Convert.ChangeType(0, typeof(T));
}
Problem is here:
public NumberLimitRang(T mvarRang)
{
mvarRang = new LimitRang<T>();
mvarNumber = (T)Convert.ChangeType(0, typeof(T));
}
You pass mvarRang
as an argument and you have field with name mvarRang
. But in method NumberLimitRang
compiler uses mvarRang
as argument, wich is type of T
and tryes to replace it's value with new LimitRang<T>();
. So, first of all, rename field or argument. For example:
public class NumberLimitRang<T> where T : IComparable
{
private LimitRang<T> _mvarRang;
private T _mvarNumber;
/// <summary>
/// The default constructor (between 0 and 100/Number = 0)
/// </summary>
public NumberLimitRang(T mvarRang)
{
_mvarRang = new LimitRang<T>();
_mvarNumber = (T)Convert.ChangeType(0, typeof(T));
}
}
It's good practice to name fields with _
in the beginning.
But now, your argument mvarRang
is unused. Revise your logic in code.
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