将文本框数据限制为int或string [英] Restrict textbox data to int or string

问题描述

我的论坛中有一个文本框，我希望用户只输入int值

I've a textbox in my forum and I want user to enter only int values

if（textbox1.text == int）

{

\\\ \\计算

}



其他

{

\\错误

}

if(textbox1.text==int)
{
\\Calculations
}

else
{
\\Error
}

推荐答案

您好，



以下是直接拍摄的示例来自MSDN。您将需要对其进行一些修改以满足您的需求，

Hello,

Here is a example directly taken from MSDN. You will have to modify it a bit to suite your needs,

// Boolean flag used to determine when a character other than a number is entered.
private bool nonNumberEntered = false;

// Handle the KeyDown event to determine the type of character entered into the control.
private void textBox1_KeyDown(object sender, System.Windows.Forms.KeyEventArgs e)
{
    // Initialize the flag to false.
    nonNumberEntered = false;

    // Determine whether the keystroke is a number from the top of the keyboard.
    if (e.KeyCode < Keys.D0 || e.KeyCode > Keys.D9)
    {
        // Determine whether the keystroke is a number from the keypad.
        if (e.KeyCode < Keys.NumPad0 || e.KeyCode > Keys.NumPad9)
        {
            // Determine whether the keystroke is a backspace.
            if(e.KeyCode != Keys.Back)
            {
                // A non-numerical keystroke was pressed.
                // Set the flag to true and evaluate in KeyPress event.
                nonNumberEntered = true;
            }
        }
    }
    //If shift key was pressed, it's not a number.
    if (Control.ModifierKeys == Keys.Shift) {
        nonNumberEntered = true;
    }
}

// This event occurs after the KeyDown event and can be used to prevent
// characters from entering the control.
private void textBox1_KeyPress(object sender, System.Windows.Forms.KeyPressEventArgs e)
{
    // Check for the flag being set in the KeyDown event.
    if (nonNumberEntered == true)
    {
        // Stop the character from being entered into the control since it is non-numerical.
        e.Handled = true;
    }
}

问候，

Regards,

void textBox1_KeyPress(object sender, KeyPressEventArgs e)
{
if (!Char.IsDigit(e.KeyChar) && e.KeyCode != Keys.Back )
{
e.Handled = true;
}
}

也试试这个代码..它只接受int值

also try this code..it will accept only int value

private void textBox2_KeyPress(object sender, KeyPressEventArgs e)
        {
            if (!System.Text.RegularExpressions.Regex.IsMatch(e.KeyChar.ToString(), @"^[0-9\b?]

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