Program *不包含静态＆＃39; Main＆＃39;适用于带代码的入口点*的方法

Question

我已经完成了制作程序的作业，该程序由2个单独的项目组成，包含方形，矩形和平行六面体的类，并且能够计算它们的区域。我认为我已经正确地完成了所有事情并连接了项目，但是当我尝试编译代码时，我不断收到此错误消息：

程序*不包含静态＆＃39; Main＆＃39;适合入境点的方法。

我的两个项目都有静态主要方法。

第一个项目

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace zad8
{
    public abstract class CFormulas
    {
        abstract public double S();
        abstract public double P();
        abstract public double SF();
        abstract public double V();
    }
    public class CSquare : CFormulas
    {
        double a { get; set; }
        public CSquare(double a)
        { this.a = a; }
        public override double S() { return a * a; }
        public override double P() { return 4 * a; }

    }
   public class CRectangular : CFormulas
    {
        public double a { get; set; }
        public double b { get; set; }
        public CRectangular(double a, double b)
        {
            this.a = a;
            this.b = b;
        }
        public override double S() { return a * b; }
        public override double P() { return 2 * (a + b); }
    }
    class zad
    {
        static void Main(string[] args)
        {
            CSquare f1 = new CSquare(5);
            Console.WriteLine("Лицето на квадрата е {0}, а периметъра е {1}.", f1.S(), f1.P());
            CRectangular f2 = new CRectangular(2, 3);
            Console.WriteLine("Лицето на правоъгълника е {0}, а периметъра е {1}.", f2.S(), f2.P());
            Console.ReadKey(true);
        }
    }
}

第二个项目

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using zad8;


namespace zad8
{
    class CParallelepiped : CRectangular
    {
        public CParallelepiped(double a, double b, double h) : base(a, b) {
            this.h = h;
            this.a = a;
            this.b = b;
        }
        double h { get; set; }
        //public CParallelepiped(double h) { this.h = h; }



        public override double SF() { return 2 * (a*b+b*h+h*a); }
        public override string ToString()
        {
            return string.Format("Пълната повърхнина на фигурата е {0}",SF());
        }
        public override double V() { return a*b* h; }
        public override string ToString() { return string.Format("Обема на фигурата е {0}", V()); }
    }

    class Program
    {
        static void Main(string [] args)
        {
            //CParallelepiped f3 = new CParallelepiped(1,2,3);
            //Console.WriteLine("Пълната повърхнина на паралелепипеда е {0}.", f3.SF());
            Console.ReadKey(true);
        }
     }
}

Answer 1

您的实现中存在一些问题，但Main方法不是其中之一。

• 您需要实现所有抽象成员。
• CParallelepiped
中有两个ToString（）实现
• 您可能不应该从其他控制台应用程序引用控制台应用程序。请改为使用类库。

以下代码编译：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using zad8;


namespace zad8
{
    public abstract class CFormulas
    {
        abstract public double S();
        abstract public double P();
        abstract public double SF();
        abstract public double V();
    }
    public class CSquare : CFormulas
    {
        double a { get; set; }
        public CSquare(double a)
        { this.a = a; }
        public override double S() { return a * a; }
        public override double P() { return 4 * a; }
        public override double SF()
        {
            throw new NotImplementedException();
        }

        public override double V()
        {
            throw new NotImplementedException();
        }
    }
    public class CRectangular : CFormulas
    {
        public double a { get; set; }
        public double b { get; set; }
        public CRectangular(double a, double b)
        {
            this.a = a;
            this.b = b;
        }
        public override double S() { return a * b; }
        public override double P() { return 2 * (a + b); }
        public override double SF()
        {
            throw new NotImplementedException();
        }

        public override double V()
        {
            throw new NotImplementedException();
        }
    }

    class CParallelepiped : CRectangular
    {
        public CParallelepiped(double a, double b, double h) : base(a, b) {
            this.h = h;
            this.a = a;
            this.b = b;
        }
        double h { get; set; }
        //public CParallelepiped(double h) { this.h = h; }



        public override double SF() { return 2 * (a*b+b*h+h*a); }

        public override double V() { return a*b* h; }
        public override string ToString() { return string.Format("Обема на фигурата е {0}", V()); }
    }

    class Program
    {
        static void Main(string [] args)
        {
            //CParallelepiped f3 = new CParallelepiped(1,2,3);
            //Console.WriteLine("Пълната повърхнина на паралелепипеда е {0}.", f3.SF());
            Console.ReadKey(true);
        }
     }
}