C＃中的帮助（无法找到命名空间Form1） [英] Help in C# (Namespace Form1 could not be found)

问题描述

大家好

我是c＃的新手，想要创建简单的计算器（ Windows窗体应用程序）

i am new to c# and want to create simple calculator (Windows Form application)

但是当我尝试运行它时，它说  &"无法找到类型或命名空间名称'Form1'
（您是否缺少using指令或汇编引用？）"

but when i try to run it , it says "The type or namespace name 'Form1' could not be found (are you missing a using directive or an assembly reference?)"

这是我使用System创建计算器的按钮和教科书后的代码

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;



namespace Calculator
{
    public partial class Calculator : Form
    {
        double FirstNumber;
        string Operation;
        public Calculator()

        {
            InitializeComponent();
        }

        private void button3_Click(object sender, EventArgs e)
        {
            if (textBox1.Text == "0" && textBox1.Text != null)
            {
                textBox1.Text = "3";
            }
            else
            {
                textBox1.Text = textBox1.Text + "3";
            }
        }

        private void n1_Click(object sender, EventArgs e)
        {
            if (textBox1.Text == "0" && textBox1.Text != null)
            {
                textBox1.Text = "1";
            }
            else
            {
                textBox1.Text = textBox1.Text + "1";
            }
        }

        private void n2_Click(object sender, EventArgs e)
        {
            if (textBox1.Text == "0" && textBox1.Text != null)
            {
                textBox1.Text = "2";
            }
            else
            {
                textBox1.Text = textBox1.Text + "2";
            }
        }

        private void n4_Click(object sender, EventArgs e)
        {
            if (textBox1.Text == "0" && textBox1.Text != null)
            {
                textBox1.Text = "4";
            }
            else
            {
                textBox1.Text = textBox1.Text + "4";
            }
        }

        private void n5_Click(object sender, EventArgs e)
        {
            if (textBox1.Text == "0" && textBox1.Text != null)
            {
                textBox1.Text = "5";
            }
            else
            {
                textBox1.Text = textBox1.Text + "5";
            }
        }

        private void n6_Click(object sender, EventArgs e)
        {
            if (textBox1.Text == "0" && textBox1.Text != null)
            {
                textBox1.Text = "6";
            }
            else
            {
                textBox1.Text = textBox1.Text + "6";
            }
        }

        private void n7_Click(object sender, EventArgs e)
        {
            if (textBox1.Text == "0" && textBox1.Text != null)
            {
                textBox1.Text = "7";
            }
            else
            {
                textBox1.Text = textBox1.Text + "7";
            }
        }

        private void n8_Click(object sender, EventArgs e)
        {
            if (textBox1.Text == "0" && textBox1.Text != null)
            {
                textBox1.Text = "8";
            }
            else
            {
                textBox1.Text = textBox1.Text + "8";
            }
        }

        private void n9_Click(object sender, EventArgs e)
        {
            if (textBox1.Text == "" && textBox1.Text != null)
            {
                textBox1.Text = "9";
            }
            else
            {
                textBox1.Text = textBox1.Text + "9";
            }
        }

        private void n0_Click(object sender, EventArgs e)
        {
            textBox1.Text = textBox1.Text + "0";
        }
        private void bad_Click(object sender, EventArgs e)
        {
            FirstNumber = Convert.ToDouble(textBox1.Text);
            textBox1.Text = "0";
            Operation = "+";
        }
        private void bsub_Click(object sender, EventArgs e)
        {
            FirstNumber = Convert.ToDouble(textBox1.Text);
            textBox1.Text = "0";
            Operation = "-";

        }
        private void bmul_Click(object sender, EventArgs e)
        {
            FirstNumber = Convert.ToDouble(textBox1.Text);
            textBox1.Text = "0";
            Operation = "*";
        }
        private void bdiv_Click(object sender, EventArgs e)
        {
            FirstNumber = Convert.ToDouble(textBox1.Text);
            textBox1.Text = "0";
            Operation = "/";
        }

        private void bc_Click(object sender, EventArgs e)
        {
            textBox1.Text = "0";
        }

        private void ndot_Click(object sender, EventArgs e)
        {
            textBox1.Text = textBox1.Text + ".";
        }

        private void nequal_Click(object sender, EventArgs e)
        {
            double SecondNumber;
            double Result;

            SecondNumber = Convert.ToDouble(textBox1.Text);

            if (Operation == "+")
            {
                Result = (FirstNumber + SecondNumber);
                textBox1.Text = Convert.ToString(Result);
                FirstNumber = Result;
            }
            if (Operation == "-")
            {
                Result = (FirstNumber - SecondNumber);
                textBox1.Text = Convert.ToString(Result);
                FirstNumber = Result;
            }
            if (Operation == "*")
            {
                Result = (FirstNumber * SecondNumber);
                textBox1.Text = Convert.ToString(Result);
                FirstNumber = Result;
            }
            if (Operation == "/")
            {
                if (SecondNumber == 0)
                {
                    textBox1.Text = "Cannot divide by zero";

                }
                else
                {
                    Result = (FirstNumber / SecondNumber);
                    textBox1.Text = Convert.ToString(Result);
                    FirstNumber = Result;
                }
            }
        }
    }
}

推荐答案

&"找不到类型或命名空间名称'Form1'（您是否错过了使用指令或汇编参考？）"

命名空间 计算器

您将命名空间名称更改为上面的名称，您需要更改它回到  Form1，因为有很多内部事物引用了Form1的名称空间名称。 

You changed the namespace name to the above, and you need to change it back to Form1, becuase there are a lot of internal things referencing the namepace name of Form1. 

这篇关于C＃中的帮助（无法找到命名空间Form1）的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！