判断文本框中是不是全为数字

首先导入命名空间:

using System.Text.RegularExpressions;

因为要用到正则表达式

 private void button1_Click(object sender, EventArgs e)   

 {                 

              if (IsFloat(textBox1.Text.ToString()))                  

             {                                   

                       MessageBox.Show("对,输入的全是数字", "!!!");       

             }                         

             else                     

            {                                    

                      MessageBox.Show("错,不是全为数字", "!!!");    

            }        

 }          

public static bool IsFloat(string inString)        

 {         

                 Regex regex = new Regex(@"^/d*/.?/d*$");     

                 return regex.IsMatch(inString.Trim());  

 }