【WinForm】设置TextBox只能输入整数或数字

创建日期：2019-04-24

设置TextBox只能输入整数或数字

/// <summary>
/// 只能输入整数
/// </summary>
private static void tb_KeyPressInt(object sender, KeyPressEventArgs e)
{
    //如果输入的不是退格和数字，则屏蔽输入
    if (!(e.KeyChar == '\b' || (e.KeyChar >= '0' && e.KeyChar <= '9')))
    {
        e.Handled = true;
    }
}

/// <summary>
/// 只能输入数字
/// </summary>
private static void tb_KeyPressNumber(object sender, KeyPressEventArgs e)
{
    //如果输入的不是退格且不能转为小数，则屏蔽输入
    if (!(e.KeyChar == '\b' || float.TryParse(((TextBox)sender).Text + e.KeyChar.ToString(), out float f)))
    {
        e.Handled = true;
    }
}


/// <summary>
/// 设置输入框只能输入整数
/// </summary>
public static void SetInputOnlyInt(this TextBox tb)
{
    tb.KeyPress += tb_KeyPressInt;
}

/// <summary>
/// 设置输入框只能输入数字
/// </summary>
public static void SetInputOnlyNumber(this TextBox tb)
{
    tb.KeyPress += tb_KeyPressNumber;
}


/// <summary>
/// 遍历包含在控件内的控件的集合，设置TextBox的KeyPress事件，只能输入整数
/// </summary>
/// <param name="controls">遍历对象控件</param>
public static void SetTextBoxOnlyInt(this Control ctrl)
{
    foreach (Control item in ctrl.Controls)
    {
        if (item is TextBox)
        {
            ((TextBox)item).KeyPress += tb_KeyPressInt;
        }
        else
        {
            SetTextBoxOnlyInt(item);
        }
    }
}

/// <summary>
/// 遍历包含在控件内的控件的集合，设置TextBox的KeyPress事件，只能输入数字
/// </summary>
/// <param name="controls">遍历对象控件</param>
public static void SetTextBoxOnlyNumber(this Control ctrl)
{
    foreach (Control item in ctrl.Controls)
    {
        if (item is TextBox)
        {
            ((TextBox)item).KeyPress += tb_KeyPressNumber;
        }
        else
        {
            SetTextBoxOnlyNumber(item);
        }
    }
}