如何使文本框只接受浮点值 [英] How to make a textbox accept only float values

问题描述

我有一个窗体.其中有一个文本框.我希望该文本框只接受浮点值.

I have a windows form . In that there is a textbox . I want that textbox to accept only float values.

推荐答案

private void textBox1_KeyPress(object sender, KeyPressEventArgs e)
    {
        // allows 0-9, backspace, and decimal
        if (((e.KeyChar < 48 || e.KeyChar > 57) && e.KeyChar != 8 && e.KeyChar != 46))
        {
            e.Handled = true;
            return;
        }

        // checks to make sure only 1 decimal is allowed
        if (e.KeyChar == 46)
        {
            if ((sender as TextBox).Text.IndexOf(e.KeyChar) != -1)
                e.Handled = true;
        }
    }

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