C# 程序*不包含静态'；主要'；方法适用于带有代码的入口点*

我的家庭作业是制作一个程序，由两个独立的项目组成，包含正方形、矩形和平行六面体的类，并且能够计算它们的面积。我认为我已经正确地完成了所有工作并连接了项目，但当我尝试编译代码时，我一直收到以下错误消息：

程序*不包含适合入口点的静态“Main”方法

我的两个项目都有静态的Main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);
        }
    }
}

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);
        }
     }
}

第二个项目

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);
        }
    }
}

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);
        }
     }
}

---

在您的实现中有几个问题，但主要方法不是其中之一

• 您需要实现所有抽象成员
• 在

  CParallelepiped

• 您可能不应该从其他控制台应用引用控制台应用。使用类库来代替

编译以下代码：

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);
        }
     }
}

---

您确定问题不在于

CSquare

/

CRectangle

上缺少的

SF

/

V

覆盖吗？添加这些，它会为我编译…注意：其中一个构建选项是一个开关，告诉它在中查找

Main

方法的类型。。。如果您指定了，但指定不正确：它将不起作用。尝试更改该值-它是项目属性中的“应用程序”选项卡上的“启动对象”，或作为问题的一部分在csprojPost代码中的

，而不是在pastebin上。