计算值始终为0，我不知道为什么

Question

我正在接受编程课的介绍，并且遇到了作业问题。该代码应该计算一个值，但我总是得到的答案是0.不知道我做错了什么，但希望有人能帮助我，并向我解释我的错误在哪里？ 初学者的任何提示？

class changeValue 
{ 
    //Create a class called changeValue that declares 2 integer class variables: value1 and 
    // value2. These should be declared as public and you should not use automatic properties 
    // to declare them. 
    private int _value1; 
    private int _value2; 

    public int Value1 
    { 
     get 
     { 
      return _value1; 
     }//end get 
     set 
     { 
      _value1 = value; 
     }//end set 
    } 

    public int Value2 
    { 
     get 
     { 
      return _value2; 
     }//end get 
     set 
     { 
      _value2 = value; 
     }//end set 
    } 
    public changeValue(int val1, int val2) 
    { 
     //here is the constructor where you code the if statements 
     int value1 = val1; 
     int value2 = val2; 

     if (value1 > 5) 
     { 
      value1 = val1; 
     } 
     if (val1 <= 5) 
     { 
      value1 = (val1+val2); 
     } 
     if (val2 < 10) 
     { 
      value2 = (val2 * val2 + 5); 
     } 
     if (val2 >= 10) 
     { 
      value2 = val2; 
     } 
    } 

    public void printit() 
    { 
     //here is the printit method used to print the results 
     Console.WriteLine("The calculated value is:" + (Value1 * Value2)); 

    } 
} 
class assignment3 
{ 
    public static void Main(string[] args) 
    { 
     //declare the local val1 and val2 integer variables 
     int val1; 
     int val2;  

     //prompt the user for input of two integers 
     //don’t forget to convert from the string input to integer 
     Console.Write("Enter an integer value: "); //obtain user input 
     val1 = Convert.ToInt32(Console.ReadLine()); 

     Console.Write("Enter a second integer value: "); //obtain user input 
     val2 = Convert.ToInt32(Console.ReadLine()); 

     //instantiate a changeValue object here 
     changeValue myValue = new changeValue(val1,val2); 

     myValue.printit();//call the object method printit here 
    } 
} 

}

感谢所有这种帮助，这个类是不容易的。

Answer 1

在你changeValue方法你定义了不使用你的领域

int value1 = val1; 
int value2 = val2; 

=>

_value1 = val1; 
_value2 = val2; 

Answer 2

在changeValue局部变量，你有局部变量值1和值2。你的类有变量_value1和_value2。显然，这些名字是不同的。你想改变局部变量或类变量吗？

我要补充一点，你正在做C＃的属性，所以你也有属性值1和值2，这也是不同于本地变量值1和值2（因为资本的V）