c# - 计算测量转换

Question

我是 C# 的新手，正在上一门我很吃力的课。

作业是使用文本框值 (valuetextbox) 创建一个转换应用程序，并有 2 个列表框保存英寸、英尺和码的测量值。目标是根据第一个列表框 (selectedinitialunit) 中选择的测量单位转换值，并根据第二个列表框 (selectedconvertedunit) 中选择的测量单位在标签中发布值。我不知道如何根据在值文本框中输入的值在我的 selectedinitialunit 和我的 selectedconvertedunit 之间进行比较(数学)。

namespace Measurement_Conversion
{
    public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
    }

    private void Form1_Load(object sender, EventArgs e)
    {

    }

    private void convertedValueLabel_Click(object sender, EventArgs e)
    {

    }

    private void exitButton_Click(object sender, EventArgs e)
    {
        Close();
    }

    private void resetButton_Click(object sender, EventArgs e)
    {
        valueTextBox.Text = "";
        convertedValueLabel.Text = "";
        DesiredUnitBox.SelectedIndex = -1;
        InitialUnitBox.SelectedIndex = -1;
        valueTextBox.Focus();
    }

    private void convertButton_Click(object sender, EventArgs e)
    {

        //Declare Variables
        decimal initialvalue;
        decimal convertedvalue;
        string selectedInitialUnit;
        string selectedConvertedUnit;



        //Grab Initial Value
        initialvalue = int.Parse(valueTextBox.Text);

        //Determining Initial Unit has been selected.
        if (InitialUnitBox.SelectedIndex != -1)
        {
            selectedInitialUnit = InitialUnitBox.SelectedItem.ToString();

        }
        else { MessageBox.Show("Please select an Initial Unit of measurement."); }


        //Determining Desired Conversion Unit has been selected
        if (DesiredUnitBox.SelectedIndex != -1)
        {
            selectedConvertedUnit = DesiredUnitBox.SelectedItem.ToString();
        }
        else { MessageBox.Show("Please select a desired conversion unit of measurement."); }

        //Switch Statement
        switch (selectedInitialUnit)
        {
            case "Inches":
                convertedValueLabel.Text = ()
                break;
            case "Feet":
                break;
            case "Yards":
                break;


        }
    }



}

我在纸上写的是这样说的——这不是代码，只是我的思维过程:

if selectedinitialunit = INCHES and selectedconvertedunit = INCHES
then messagebox.show("Please select a different selectedconvertedunit");

else selectedinitialunit = INCHES and selectedconvertedunit = FEET
then convertedvaluelabel.Text = initialvalue/12;

else selectedinitialunit = INCHES and selectedconvertedunit = YARDS
then convertedvaluelabel.Text = initialvalue/36;

其他选定的初始单位依此类推。

非常感谢您的帮助，我希望我没有在这里到处都是。

提前致谢!

Answer 1

你可以这样写代码——

        string selectedUnit = selectedinitialunit.SelectedItem.ToString();
        string convertedUnit = selectedconvertedunit.SelectedItem.ToString();
        double valueToConvert = double.Parse(initialvalue.Text);
        if (selectedUnit.Equals(convertedUnit))
        {
            MessageBox.Show("Please select a different selectedconvertedunit");
        }
        else
        {
            switch (selectedUnit)
            {
                case "INCHES":
                    switch (convertedUnit)
                    {
                        case "FEET":
                            convertedvaluelabel.Text = (valueToConvert / 12.0).ToString();
                            break;
                        case "YARDS":
                            convertedvaluelabel.Text = (valueToConvert / 36.0).ToString();
                            break;
                    }
                    break;
            }
        }

您始终可以在代码中添加某种异常和错误处理以及验证。