default.aspx.cs

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using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

public partial class _Default : System.Web.UI.Page 
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        string BeginStr = TextBox1.Text.Trim().ToString();
        int bint = Convert.ToInt32(TextBox2.Text.ToString());
        int eint = Convert.ToInt32(TextBox3.Text.ToString());
        if (bint < 0 || bint > BeginStr.Length)
        {
            Page.RegisterStartupScript("", "<script>alert('起始位置错误')</script>");
        }
        else
        {
            if (BeginStr.Length < bint || BeginStr.Length >eint)
            {
                string Endstr = BeginStr.Substring(bint, eint);
                Label1.Text = "您截取后的结果：" + Endstr;
            }
            else
            {
                Page.RegisterStartupScript("", "<script>alert('截取的位数不要超过字符串个数')</script>");
            }
        }
    }
}