C＃.net中的税收计算错误 [英] Errors on Tax Calculation in C# .net

问题描述

你好，

Hello,

private void textBox2_TextChanged(object sender, EventArgs e)
        {
            float t;
            float g;

            t = float.Parse(textBox3.Text);
            g = float.Parse(textBox10.Text);
            float j;

            j = g * (t / 100) + g;


            Convert.ToDecimal(textBox2.Text = j.ToString());
        }

这里输入字符串不正确textbox3.text中的格式错误如何解决帮助我......

Here input string is not correct format error in textbox3.text how to resolve Help me......

推荐答案

让您的用户输入正确的值？

或者使用正确的文本框？

您正在处理textBox2事件，但是您没有; t引用textBox2 - 我怀疑你的意思是2而不是3.



但即便如此，这对待用户也是一种糟糕的方式。

在使用值之前，请检查它并向用户报告问题：此时，如果他将字段留空，则程序崩溃。如果他发错并得到一个逗号而不是一个点，它就会崩溃。如果他输入他的名字，它会崩溃。那真的很差 - 它会让你烦恼，不是吗？



试试这个：

Get your user to type correct values?
Or use the right textbox?
You are handling the textBox2 event, but you don;t reference textBox2 at all - I suspect you meant 2 rather than 3.

But even then, that is a poor way to treat users.
Before you use a value, check it, and report problems to your user: at the moment, if he leaves a field blank your program crashes. If he miskeys and gets a comma instead of a dot, it crashes. If he types his name, it crashes. That really is poor - it would annoy the heck out of you, wouldn't it?

Try this:

private void textBox2_TextChanged(object sender, EventArgs e)
    {
    float t;
    float g;
    if (!float.TryParse(textBox3.Text, out t))
        {
        MessageBox.Show("Please type a number in textbox 3!");
        return;
        }
    if (!float.TryParse(textBox10.Text, out g))
        {
        MessageBox.Show("Please type a number in textbox 10!");
        return;
        }

    float j = g * (t / 100) + g;
    string result = j.ToString();
    if (textBox2.Text != result)
        {
        textBox2.Text = result;
        }
    }

注意底部的位：如果你每次只设置TextBox2.Text的值，它会立即导致新事件发生！



并帮自己一个忙：停止使用控件的VS默认名称！将控件命名为描述用户使用它们的名称会使代码更加可靠和可读！

Notice the bit at the bottom: if you just set the value of TextBox2.Text each time, it will immediately cause a new event to occur!

And do yourself a favour: stop using VS default names for controls! Calling your controls a name that describes what the user uses them for makes your code much more reliable and readable!

textBox2  => tbTaxDue
textBox10 => tbTaxRate

等。

and so forth.

用于财务计算我们 double datataype并解决问题，从键入字母和其他特殊字符中取消它们。

for financial calculation us double datataype and to resolve the problem restict them from typing alphabets and other special characters.

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