一个比较完善的登录模块，就目前的知识范围来说应该算是完美的。
涉及到：cookies，Session，验证码等知识面
Cookies存放一组值：
HttpCookie cook = new HttpCookie("userCook");
cook.Values["name"] = this.TextBox1.Text;
cook.Values["pwd"] = this.TextBox2.Text;
cook.Expires = DateTime.Now.AddDays();
Response.Cookies.Add(cook);
Response.Redirect("AdminIndex.aspx");
取值：
if (!IsPostBack)
{
//已经登录过的，在Session有效期间可以免登录
if (Session["userInfo"] != null)
{
Response.Redirect(@"../Manage/AdminIndex.aspx");
}else if (Request.Cookies["userCook"] != null)
{
//回显登录用户的信息
this.TextBox1.Text = Request.Cookies["userCook"]["name"].ToString();
this.TextBox2.Text = Request.Cookies["userCook"]["pwd"].ToString();
}
}
验证码忽略大小写
//忽略大小写
if (!Session["code"].ToString().Equals(this.TextBox3.Text, StringComparison.InvariantCultureIgnoreCase))
{
Response.Write("<script>alert('验证码输入不正确')</script>");
return;
}
验证码的产生
/// <summary>
/// 生成验证码
/// </summary>
/// <param name="length">指定验证码的长度</param>
/// <returns></returns>
public string CreateValidateCode(int length)
{
string strArr = "0123456789abcdefghijklmnopqrxyzABCDEFGHIJKLMNOPQRXYZ";
char[] charArr = strArr.ToCharArray();
Random r = new Random();
string validateNumberStr = null;
for (int i = ; i < length; i++)
{
int a1 = r.Next(, charArr.Length);
validateNumberStr = validateNumberStr + charArr[a1] + "";
}
return validateNumberStr;
}
其他的知识，数据库中查询主键不连续表中一定范围的数据（如：第20条到第30条的数据）
思路：给表中加一列标号，然后再用子查询
加一列，编号
select *,ROW_NUMBER() over(order by MemberID) as num from [dbo].[tb_Member]
子查询
select [Address],PostCode,LoadDate from (select *,ROW_NUMBER() over(order by MemberID) as num from [dbo].[tb_Member]) as t where num>= and num<=
其他的后续再补充！！