Question

我正在尝试学习C＃泛型，但似乎无法显示数组中的元素。当我调试代码时，如果扩展节点employee，我可以看到元素。但是，当我尝试显示它时，它只是打印出类名而不是实际元素。请看下面。

public class PrintArray<T>
{
    public void OutputGeneric(T[] employee)
    {
        for (int i = 0; i < employee.Length; i++)
        {
            Console.Write("\n" + employee[i]);//I can't access to FullName and Salary
        }
    }
}

public class Employee
{
    private string Name;
    private int Income;

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

    public int Salary
    {
        set { Income = value; }
        get { return Income; }
    }
}


class Program
{
    static void Main(string[] args)
    {
        PrintArray<Employee> pa = new PrintArray<Employee>();

        Console.Write("\n\Employee: ");
        Employee[] customArray = new Employee[3];
        customArray[0] = new Employee()
        {
            FullName = "John Doe",
            Salary = 100000
        };
        customArray[1] = new Employee()
        {
            FullName = "Mary Jane",
            Salary = 50000
        };
        customArray[2] = new Employee()
        {
            FullName = "Tyler Smith",
            Salary = 80000
        };

        pa.OutputGeneric(customArray);

        Console.ReadLine();
    }
}

Answer 1

在Employee类中重写ToString（并且类似地在您要在PrintArray中使用的任何其他类中）。

public class Employee
{
    private string Name;
    private int Income;

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

    public int Salary
    {
        set { Income = value; }
        get { return Income; }
    }

    public override string ToString()
    {
        return string.Format("Name: {0}, Salary: {1}", Name, Salary);
    }
}

Answer 2

为了在仍具有通用PrintArray类和方法的同时实现您最初要寻找的内容，可以通过定义一个委托参数来接近它，该委托参数可用于指定要打印的属性：

public void OutputGeneric(T[] employee, Func<T, dynamic> selector)
{
    for (int i = 0; i < employee.Length; i++)
    {
        Console.Write("\n" + selector(employee[i]));//I still can't access to FullName and Salary
    }
}

然后调用此方法如下：

pa.OutputGeneric(customArray, x => new { x.FullName, x.Salary });

提供的输出为：

或者您可以使用以下格式设置输出格式：

pa.OutputGeneric(customArray, x => $"{x.FullName} makes ${x.Salary}");

哪个输出创建为：

Answer 3

v=ave(x[,1]==x[,1], x[,1], FUN=cumsum) t=ave(z[,1]==z[,1], z[,1], FUN=cumsum) df2 <- x[!paste(x[,1],v) %in% paste(z[,1],t)] matrix(df2,1,2) [,1] [,2] [1,] 4 9不应是类。您必须覆盖PrintArray类的ToString。

Employee

C＃显示通用数组

3 个答案: