关于textbox的类型判断问题

Question

  protected void LinkButton1_Click(object sender, EventArgs e)
    {        if (this.TextBox1.Text != null)
        {
            int id = Convert.ToInt32(this.TextBox1.Text);
            bl.delete(id);
            bl.Bind(DataList1);
            FPage();
        }
        else
        {
            Response.Write("<script language=javascript>window.open('请输入一个整数')</script>");
        } 
        
    }
当我在textbox1中输入文字时报错了，怎么可以用判断textbox1的类型来淡出一个对话框，例如请输入一个整数等等
帮我写一下这一段代码

Answer 1

int text;
if(int.TryParse(TextBox1.Text,out text ))
{
     ...
}
else
{
Response.Write("<script language=javascript>window.open('请输入一个整数')</script>");
}

Answer 2

你可以用正则表达式:   
  你可以参考一下这个例子,主要是多了解正则表达式:   
  using   System;   
  using   System.Text.RegularExpressions;   
    
  namespace   Samples   {   
          public   class   RegExMatcher   {   
                  public   static   void   Main(String[]   args){   
                          Regex   digitregex   =   new   Regex("(?<digit>[0-9])");   
                          String   before   =   "Here   is   so4848me   te88xt   with   emb4493edded   numbers.";   
                            
                          if   (   args.Length   >   0   )   {   
                                  before   =   String.Join("   ",   args);   
                          }   
                            
                          String   after   =   digitregex.Replace(before,   "");                           
    
                          System.Console.WriteLine("替换之前："   +   before);   
                          System.Console.WriteLine("替换之后："   +   after);   
    
                          System.Console.WriteLine();   
                          System.Console.WriteLine("按   Enter   键继续...");   
                          System.Console.ReadLine();   
                  }   
          }   
  }   

Answer 3

try
                {
                    int temp = int.Parse(this.txtAttendNumber.Text.Trim());
                }
                catch
                {
                  Page.ClientScript.RegisterStartupScript(this.GetType(), "alert", "<script>alert(输入格式错误')</script>");                }

Answer 4

 RangeValidator RangeValidator2 =new RangeValidator();
            RangeValidator2.ErrorMessage="XXX";
            RangeValidator2.ControlToValidate="dddtx";
           RangeValidator2.MinimumValue="1";
            RangeValidator2.MaximumValue="100";

Answer 5

function CheckText(){
try
{
var theText=document.getElementById('<%=this.textbox1.ClientID %>').value;
var a=parseInt(theText);
}
catch(e)
{ 
   alert('请输入一个整数');
   return;
}}
//CS页面
this.textbox1.Attributes.Add("onmouseout", "CheckText();");

Answer 6

protected void LinkButton1_Click(object sender, EventArgs e)
{
    if (this.TextBox1.Text != null)
    {
       try
       {
           int id = Convert.ToInt32(this.TextBox1.Text);
           bl.delete(id);
           bl.Bind(DataList1);
           FPage();
        }
        catch
        {
             Response.Write("<script language=javascript>window.open('请输入一个整数')</script>");
        }
     }
     else
     {
        Response.Write("<script language=javascript>window.open('不能为空！')</script>");
     }  
}

Answer 7

<asp:TextBox ID ="txtItem8" runat = "server" ToolTip ="只能输入数字" onkeyup="value=value.replace(/[^\d]/g,'')" onkeydown="if(event.keyCode==13)event.keyCode=9" onKeyPress="if((event.keyCode<48||event.keyCode>57)) event.returnValue=false"></asp:TextBox>