当用户键入时：用逗号分隔数字，并在 C# 中将其格式化为货币

Question

我有一个名为 textBox1 的文本框。

目标：只要用户在 textBox1 中键入内容，我就希望程序将数字转换为货币格式。

示例：如果用户键入 123456，我希望程序像这样分隔数字 123,456。

Answer 1

下面是基本的做法，当文本发生变化时将其转换为小数，然后将文本更改为小数的字符串表示。

textBox1.TextChanged += (s,e) =>
{
   var value = Decimal.Parse(textBox1.Text);
   textBox1.Text = value.ToString("C");
}

您还应该检查文本框中的非法数字。看看Decimal.TryParse.

Answer 2

经过研究，我发现了这段代码。这段代码完全符合我的要求。

    private void form_3_Load(object sender, EventArgs e)
    {
        textBox1.Text = "[=10=].00";
    }

    private void textBox1_TextChanged(object sender, EventArgs e)
    {
        ///
        //Remove previous formatting, or the decimal check will fail including leading zeros
        string value = textBox1.Text.Replace(",", "")
            .Replace("$", "").Replace(".", "").TrimStart('0');
        decimal ul;
        //Check we are indeed handling a number
        if (decimal.TryParse(value, out ul))
        {
            ul /= 100;
            //Unsub the event so we don't enter a loop
            textBox1.TextChanged -= textBox1_TextChanged;
            //Format the text as currency
            textBox1.Text = string.Format(CultureInfo.CreateSpecificCulture("en-US"), "{0:C2}", ul);
            textBox1.TextChanged += textBox1_TextChanged;
            textBox1.Select(textBox1.Text.Length, 0);
        }
        bool goodToGo = TextisValid(textBox1.Text);
        btn_test.Enabled = goodToGo;
        if (!goodToGo)
        {
            textBox1.Text = "[=10=].00";
            textBox1.Select(textBox1.Text.Length, 0);
        }
        ///
    }

    private bool TextisValid(string text)
    {
        Regex money = new Regex(@"^$(\d{1,3}(\,\d{3})*|(\d+))(\.\d{2})?$");
        return money.IsMatch(text);
    }


    void tb_TextChanged(object sender, EventArgs e)
    {
        //Remove previous formatting, or the decimal check will fail
        string value = textBox1.Text.Replace(",", "").Replace("$", "");
        decimal ul;
        //Check we are indeed handling a number
        if (decimal.TryParse(value, out ul))
        {
            //Unsub the event so we don't enter a loop
            textBox1.TextChanged -= tb_TextChanged;
            //Format the text as currency
            textBox1.Text = string.Format(CultureInfo.CreateSpecificCulture("en-US"), "{0:C2}", ul);
            textBox1.TextChanged += tb_TextChanged;
        }
    }

Answer 3

我知道已经晚了，但试试这个应该可以解决您的问题

private void textBox1_TextChanged(object sender, EventArgs e)
        {
            if (textBox1.Text.Length > 0)
            {
                textBox1.Text = Convert.ToDouble(textBox1.Text).ToString("N0");
                textBox1.SelectionStart = textBox1.Text.Length;
            }
        }

当用户键入时：用逗号分隔数字，并在 C# 中将其格式化为货币

As the user types: Separate numbers with commas, and format it into currency in C#

.net

c#

textbox

currency

winforms