所以，下面是我所得到的。它一直告訴我我無法在小數或雙精度上使用數學運算符。不幸的是，這些是我必須使用的。我想要做的是將長度測量從英制轉換為公制。我已經查看了許多其他與此相關的問題，并且能夠弄清楚部分代碼以及如何讓它讓我做一個“if”語句。但我就是想不通它的數學部分。誰能指出我正確的方向？public partial class Form1 : Form{ string conversions; decimal meter, feet, centimeter, inches, miles, kilometers; public Form1() { InitializeComponent(); } private void btnCalculate_Click(object sender, EventArgs e) { calculateConversions(); } private void Form1_Load(object sender, EventArgs e) { cbConversion.SelectedText = "Miles to Kilometers"; string[] Conversion = new string[] { "Miles to Kilometers", "Kilometers to Miles", "Feet to Meters", "Meters to Feet", "Inches to Centimeters", "Centermeters to Inches" }; { } for (int i = 0; i < Conversion.Length; i++) { cbConversion.Items.Add(Convert.ToString(Conversion[i])); } miles = 0m; kilometers = 0m; feet = 0m; meter = 0m; inches = 0m; centimeter = 0m; } private void cbConversion_SelectedIndexChanged(object sender, EventArgs e) { conversions = Convert.ToString(cbConversion.SelectedItem); IList<string> lstString = new List<string>(); lstString.Add("Miles:"); lstString.Add("Kilometers:"); lstString.Add("Feet:"); lstString.Add("Meters:"); lstString.Add("Inches:"); lstString.Add("Centimeters:"); label2.Text = lstString[cbConversion.SelectedIndex]; IList<string> lstStringTwo = new List<string>(); lstStringTwo.Add("Kilometers:"); lstStringTwo.Add("Miles:"); lstStringTwo.Add("Meters:"); lstStringTwo.Add("Feet:"); lstStringTwo.Add("Centimeters:"); lstStringTwo.Add("Inches:"); label3.Text = lstStringTwo[cbConversion.SelectedIndex]; }我什至翻閱了我的書，但無法弄清楚（這是一項家庭作業）我擁有的 GUI。它是通過組合框選擇的，輸入的文本被計算到轉換中。一切正常，但數學
2 回答
一只斗牛犬
TA貢獻1784條經驗 獲得超2個贊
我cbConversion.SelectedIndex = 0;在 form1_load 中添加以選擇組合框的第一個索引，然后在calculateConversions()我在 textoutput.text 中輸出的每個條件下使用函數。
然后剩下的你可以做 else if 并研究其他轉換公式。
我使用cbConversion.SelectedItem.ToString()了這樣您就可以從組合框中獲取項目文本以進行比較。
你可以試試這個
string conversions;
decimal meter, feet, centimeter, inches, miles, kilometers;
private void btnCalculate_Click(object sender, EventArgs e)
{
calculateConversions();
}
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
cbConversion.SelectedText = "Miles to Kilometers";
string[] Conversion = new string[] { "Miles to Kilometers",
"Kilometers to Miles",
"Feet to Meters",
"Meters to Feet",
"Inches to Centimeters",
"Centermeters to Inches" };
{ }
for (int i = 0; i < Conversion.Length; i++)
{
cbConversion.Items.Add(Convert.ToString(Conversion[i]));
}
miles = 0m;
kilometers = 0m;
feet = 0m;
meter = 0m;
inches = 0m;
centimeter = 0m;
cbConversion.SelectedIndex = 0;
}
private void cbConversion_SelectedIndexChanged(object sender, EventArgs e)
{
conversions = Convert.ToString(cbConversion.SelectedItem);
IList<string> lstString = new List<string>();
lstString.Add("Miles:");
lstString.Add("Kilometers:");
lstString.Add("Feet:");
lstString.Add("Meters:");
lstString.Add("Inches:");
lstString.Add("Centimeters:");
label2.Text = lstString[cbConversion.SelectedIndex];
IList<string> lstStringTwo = new List<string>();
lstStringTwo.Add("Kilometers:");
lstStringTwo.Add("Miles:");
lstStringTwo.Add("Meters:");
lstStringTwo.Add("Feet:");
lstStringTwo.Add("Centimeters:");
lstStringTwo.Add("Inches:");
label3.Text = lstStringTwo[cbConversion.SelectedIndex];
}
private void calculateConversions()
{
decimal input = Convert.ToDecimal(txtInput.Text);
decimal mileToKM = Convert.ToDecimal(1.609344);
if (cbConversion.SelectedItem.ToString() == "Miles to Kilometers")
{
decimal miles = (input * mileToKM);
txtOutput.Text = miles.ToString();
}
}
輸出
墨色風雨
TA貢獻1853條經驗 獲得超6個贊
這是我現在使用的代碼
private void Form1_Load(object sender, EventArgs e)
{
cbConversion.SelectedText = "Miles to Kilometers";
string[] Conversion = new string[] { "Miles to Kilometers",
"Kilometers to Miles",
"Feet to Meters",
"Meters to Feet",
"Inches to Centimeters",
"Centermeters to Inches" };
{ }
for (int i = 0; i < Conversion.Length; i++)
{
cbConversion.Items.Add(Convert.ToString(Conversion[i]));
}
miles = 0m;
kilometers = 0m;
feet = 0m;
meter = 0m;
inches = 0m;
centimeter = 0m;
cbConversion.SelectedIndex = 0;
}
private void cbConversion_SelectedIndexChanged(object sender, EventArgs e)
{
conversions = Convert.ToString(cbConversion.SelectedItem);
IList<string> lstString = new List<string>();
lstString.Add("Miles:");
lstString.Add("Kilometers:");
lstString.Add("Feet:");
lstString.Add("Meters:");
lstString.Add("Inches:");
lstString.Add("Centimeters:");
label2.Text = lstString[cbConversion.SelectedIndex];
IList<string> lstStringTwo = new List<string>();
lstStringTwo.Add("Kilometers:");
lstStringTwo.Add("Miles:");
lstStringTwo.Add("Meters:");
lstStringTwo.Add("Feet:");
lstStringTwo.Add("Centimeters:");
lstStringTwo.Add("Inches:");
label3.Text = lstStringTwo[cbConversion.SelectedIndex];
}
private void calculateConversions()
{
decimal input = Convert.ToDecimal(txtInput.Text);
decimal mileToKM = Convert.ToDecimal(1.6093);
decimal kMToMile = Convert.ToDecimal(0.6214);
decimal ftToM = Convert.ToDecimal(0.3048);
decimal mToFt = Convert.ToDecimal(3.2808);
decimal inToCm = Convert.ToDecimal(2.54);
decimal cmToIn = Convert.ToDecimal(0.3937);
if (cbConversion.SelectedText.ToString() == "Miles to Kilometers")
{
decimal miles = (input * mileToKM);
txtOutput.Text = miles.ToString();
}
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