Question

我的项目有一个 Textbox 字段，名为 txtdisc 。我需要从另一个名为 txttotal 的 Textbox 中减去输入的值。问题是，如果输入百分号，我需要减去百分比。例如，如果我的总值是1000而我的折扣值是2，那么我需要答案为998，如果输入的值是2％，我需要将值作为980.我使用_textchanged事件进行计算。 / p>

我的代码是：

private void txtdiscount_TextChanged(object sender, EventArgs e)
{
  if (txtdiscount.Text.Length > 0 && lbltotal.Text != "")
  {
    decimal net = 0, total = 0, discount = 0;
    total = Convert.ToDecimal(lbltotal.Text);
    discount = Convert.ToDecimal(txtdiscount.Text);
    net =total- discount;
    lblnetamount.Text = net.ToString();
  }
}

Answer 1

您可以使用Contains

查找百分号

如果找到，您可以使用Trim('%');

将其删除

然后修改您的计算以执行百分比

 if (txtdiscount.Text.Length > 0 && lbltotal.Text != "")
     {
        decimal net = 0, total = 0, discount = 0;
        total = Convert.ToDecimal(lbltotal.Text);
        if (txtdiscount.Contains("%"))
        {
           discount = Convert.ToDecimal(txtdiscount.Text.Trim('%'));
           net = total - (total * (discount / 100));
        }
        else
        {
           discount = Convert.ToDecimal(txtdiscount.Text);
           net = total - discount;
        }
        lblnetamount.Text = net.ToString();

     }

<强>资源

String.Trim Method (Char[])

String.Contains Method (String)

Answer 2

试试这个：

private void txtdiscount_TextChanged(object sender, EventArgs e)
{
    if (txtdiscount.Text.Length > 0 && lbltotal.Text != "")
    {
        decimal net = 0, total = 0, discount = 0;
        total = Convert.ToDecimal(lbltotal.Text);
        discount = Convert.ToDecimal(txtdiscount.Text.Replace("%",""));
        if(txtdiscount.Text.EndsWith("%")
           discount = total * (discount/100);
        net = total- discount;
        lblnetamount.Text = net.ToString();
    }
}

说明：

discount = Convert.ToDecimal(txtdiscount.Text.Replace("%",""));

如果您的文字中有％，则将其剥离。

if(txtdiscount.Text.EndsWith("%")
           discount = total * (discount/100);

如果txtdiscount.Text以％结尾，则计算百分比折扣，否则保留折扣。

重要

我建议您使用decimal.TryParse方法或Convert.ToDecimal

Answer 3

这可能是更好的一个：

private void txtdiscount_TextChanged(object sender, EventArgs e)
{
    if (!string.IsNullOrEmpty(txtdiscount.Text) && !string.IsNullOrEmpty(lbltotal.Text))
    {
        decimal net = 0, total = 0, discount = 0;
        total = decimal.TryParse(lbltotal.Text, out total);
        discount = decimal.TryParse(txtdiscount.Text.Replace("%",""), out discount);
        discount = txtdiscount.Text.EndsWith("%")?total * (discount/100):discount;
        net = total- discount;
        lblnetamount.Text = net.ToString();
    }
}

Answer 4

        int discount, total = 1000, net;
        if(txtdiscount.EndsWith("%"))
                 discount  = total*Convert.ToInt32(txtdiscount.Substring(0, st.Length-1))/100;
        else
                 discount  =Convert.ToInt32(txtdiscount.Substring(0, st.Length-1));
        net = total -discount;

这里我们只是检查字符串是否以'％'结尾。如果是，我们将剥离它并计算总数的百分比。

Answer 5

尝试以下代码：

使用Contains()方法查找文本框是否包含％符号，并使用Split()方法从值中删除％：

 private void txtdiscount_TextChanged(object sender, EventArgs e)
  {
     if (txtdiscount.Text.Length > 0 && lbltotal.Text != "")
     {
        decimal net = 0, total = 0, discount = 0;
        total = Convert.ToDecimal(lbltotal.Text);
        if(txtdiscount.Text.Contains('%'))
        {
          discount = Convert.ToDecimal(txtdiscount.Text.split('%')[0]);
          net = total - total*discount/100;
        }
        else
        {
          discount = Convert.ToDecimal(txtdiscount.Text);
          net =total- discount;
        }
        lblnetamount.Text = net.ToString();
     }
  }

希望它能帮到你

Answer 6

您可以使用此代码

private void txtdiscount_TextChanged(object sender, EventArgs e)
{
   if (txtdiscount.Text.Length > 0 && lbltotal.Text != "")
   {
      decimal net = 0, total = 0, discount = 0;
      total = Convert.ToDecimal(lbltotal.Text);
      if (txtdiscount.Text.IndexOf('%') != -1)
      {
        discount = total *  Convert.ToDecimal(txtdiscount.Text.Split('%')[0])/100;
      }
      else
      {
        discount = Convert.ToDecimal(txtdiscount.Text);
      }
      net =total- discount;
      lblnetamount.Text = net.ToString();

    }
 }

如果百分号符号在文本中，则计算百分比

6 个答案: