设置文本框只能输入数字型字符串

落日映苍穹つ 2021-12-24 15:13 217阅读 0赞

\#region  设置文本框只能输入数字型字符串  
        /// <summary>  
        /// 文本框只能输入数字型和单精度型的字符串.  
        /// </summary>  
        /// <param name="e">KeyPressEventArgs类</param>  
        /// <param name="s">文本框的字符串</param>  
        /// <param name="n">标识，判断是数字型还是单精度型</param>  
        public void Estimate\_Key(KeyPressEventArgs e,string s,int n)  
        \{  
            if (n==0)   //只能输入整型  
                if (!(e.KeyChar <= '9' && e.KeyChar >= '0') && e.KeyChar != '\\r' && e.KeyChar != '\\b')  
                \{  
                    e.Handled = true;   //处理KeyPress事件  
                \}  
            if (n == 1) //可以输入整型或单精度型  
            \{  
                if ((!(e.KeyChar <= '9' && e.KeyChar >= '0')) && e.KeyChar != '.' && e.KeyChar != '\\r' && e.KeyChar != '\\b')  
                \{  
                    e.Handled = true;  
                \}  
                else  
                \{  
                    if (e.KeyChar == '.')   //如果输入“.”  
                        if (s == "")    //当前文本框为空  
                            e.Handled = true;   //处理KeyPress事件  
                        else  
                        \{  
                            if (s.Length > 0)   //当文本框不为空时  
                            \{  
                                if (s.IndexOf(".") > -1)    //查找是否已输入过“.”  
                                    e.Handled = true;   //处理KeyPress事件  
                            \}  
                        \}  
                \}  
            \}  
        \}  
        \#endregion

用法：放在你的textbox的keypress事件里面：

C\# code

private  void  textBox1\_KeyPress( object  sender, KeyPressEventArgs e) \{ Estimate\_Key(e,textBox1.Text, 1 ); // 1表示可以输入整数和浮点数，0表示只能输入整数   \}

转载于:https://www.cnblogs.com/hubcarl/archive/2009/11/18/1605588.html