Question

我有一个可以编译的工作应用程序。两个按钮工作，但我需要它们每次单击加速/减少速度5，目前他们只会让我点击一次加速给我一个5的速度答案，而减速给出-5。如何更改此设置以允许单击每个按钮并且速度更新多次？

以下是表格：

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

namespace Car_Class_BBrantley
{
    public partial class Form1 : Form
{
private Car myCar;

public Form1()
{
myCar = new Car();

InitializeComponent();
}


private void GetCarData()
{

try {
myCar.Make = txtMake.Text;

myCar.Year = int.Parse(txtModel.Text);

myCar.Speed = 0;

}
            catch (Exception ex)
{
                MessageBox.Show(string.Concat("Must enter a valid make and year model for the car. ", ex.Message, "\r\n", ex.StackTrace));
} 

}

private void btnAcc_Click(object sender, EventArgs e)
{
GetCarData();
myCar.AccSpeed(5);
lblAnswer.Text = " Your car is a " + myCar.Year + " " + myCar.Make + " and it is traveling " + myCar.Speed + " mph. ";
}
private void btnBrake_Click(object sender, EventArgs e)
{
GetCarData();
myCar.DecSpeed(5);
lblAnswer.Text = " Your car is a " + myCar.Year + " " + myCar.Make + " and it is traveling " + myCar.Speed + " mph. ";
}


}
}

这是班级：

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

namespace Car_Class_BBrantley
{
class Car
{
private int year;
private string make;
private int speed;

public Car()
{
    this.year = 1994;
    this.make = "Ford";
    this.speed = 0;
}

public Car(string make, int year, int speed)
{
    this.year = year;
    this.make = make;
    this.speed = speed;
}

public string Make
{
    get { return make; }
    set { make = value; }
}

public int Year
{
    get { return year; }
    set { year = value; }
}

public int Speed
{
    get { return speed; }
    set { speed = value; }
}

public void AccSpeed(int speedIncrement)
{
    //Add check for speed limit ranges
    Speed += speedIncrement;
}

public void DecSpeed(int speedDecrement)
{
    //Add check for speed limit ranges
    Speed -= speedDecrement;
}
}

}

Answer 1

由于这可能是家庭作业，我只是给出提示。使用这两个点击功能，您拨打的第一个电话是GetCarData()。在GetCarData()内，您正在调用myCar.Speed = 0;，因此每次点击都会回到原点并不奇怪。

假设您只需要一个Car个实例用于整个应用程序，您只需要修改GetCarData()的内容（或者不做）你的内容想。只需对该功能进行一些调整，我会让你试验一下，你会很高兴。

但是，如果您想在应用中使用多个Car个对象，则需要将其修改为某种List（或者更好，IDictionary）

单击每个按钮增加速度

1 个答案: