Question

我有一个几乎没有组合框，texbox等的winform ...所以我想通过点击btnAdd来增加txtTotal中txtStake的值，但是每当我点击btnAdd时我也希望乘以结果。

 //For example:
 //click-1, txtStake = 2, txtTotal = 2;
 //click-2, txtStake = 2, txtTotal = 4;
 //click-3, txtStake = 3, txtTotal = 12;
 //click-3, txtStake = 4.5 txtTotal = 54; Ok? How to do that? Thanks.
 --------------------------------------------------------------------

class Multy
{        
    public decimal Stake;

    public Multy()
    {}   
}

 private List<Multy> matches = new List<Multy>();

 private void btnAdd_Click(object sender, EventArgs e)
    {
        matches = new List<Multy>();
        Multy match = new Multy();

        match.Stake = decimal.Parse(txtStake.Text);

        matches.Add(match);

        decimal l_Stake;

        string strStake;

        string strOutputLine;

        foreach (Multy m in matches)
        {              
            l_Stake = m.Stake;

            strStake = l_Stake.ToString();
        }
       txtTotal.text = //code?   
     }

Answer 1

我真的不明白你为什么要在列表中添加一个元素然后使用foreach ...如果你想将txtStake值乘以txtTotal的当前值，那么就这样做吧以下内容：

decimal result,value;
if(decimal.TryParse(txtStake.Text,out result) 
    && decimal.TryParse(txtTotal.Text,out value))
         txtTotal.Text = (result * value).ToString();
else if(decimal.TryParse(txtStake.Text,out result))
         txtTotal.Text = result.ToString();

您的Multy课程也毫无意义，您可以使用List<decimal>

Answer 2

你基本上要求这个（没有错误处理，随意改进它）：

private void btnAdd_Click(object sender, EventArgs e)
{
    var stake = decimal.Parse(txtStake.Text);
    var total = decimal.Parse(txtTotal.Text); 
    total *= stake;
    txtTotal.Text = total.ToString();
}

但是你的代码中有很多东西。 Multy？ List？ foreach？

Answer 3

你可能想要这样的东西：

private List<Multy> matches = new List<Multy>();

private void btnAdd_Click(object sender, EventArgs e)
{
    // do NOT create a new 'matches' list, use the existing one
    Multy match = new Multy();
    match.Stake = decimal.Parse(txtStake.Text); 
    // you should use "TryParse" here, what if the user entered "A"?
    matches.Add(match);

    decimal runningTotal = 1m; // base value

    foreach (Multy m in matches)
    {              
        runningTotal = runningTotal * m.Stake;
    }
   txtTotal.text = runningTotal.ToString();  
 }

执行乘法，文本框

3 个答案: