ASP.Net状态管理
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ASP.NET使用了ViewState视图状态,是所有控件得一个属性。
通过一个列子说明一下 :
private void btnOK_Click(object sender, System.EventArgs e)
{
if (ViewState["Count"] == null)
ViewState["Count"] = 0;
int nCount = (int)ViewState["Count"];
nCount +=1;
ViewState["Count"] = nCount;
lbText.Text = nCount.ToString();
}
private void btnNext_Click(object sender, System.EventArgs e)
{//下一页
Panel mypanel;
string panelname;
panelname = "Panel" + ViewState["currentpage"];
mypanel = (Panel)FindControl(panelname);
mypanel.Visible = false;
int currentpage = (int)ViewState["currentpage"];
currentpage += 1;
ViewState["currentpage"] = currentpage;
panelname = "Panel" + ViewState["currentpage"];
mypanel = (Panel)FindControl(panelname);
mypanel.Visible =true;
}
private void btnPrev_Click(object sender, System.EventArgs e)
{//上一页
Panel mypanel;
string panelname;
panelname = "Panel" + ViewState["currentpage"];
mypanel = (Panel)FindControl(panelname);
mypanel.Visible = false;
int currentpage = (int)ViewState["currentpage"];
currentpage -= 1;
ViewState["currentpage"] = currentpage;
panelname = "Panel" + ViewState["currentpage"];
mypanel = (Panel)FindControl(panelname);
mypanel.Visible = true;
}
private void btnFinl_Click(object sender, System.EventArgs e)
{//显示
Panel3.Visible = false;
Panel4.Visible = true;
Label1.Text = "姓名:" + name.Text +"<br>";
Label1.Text += "性别:" + RadioButtonList1.SelectedItem.Text + "<br>";
Label1.Text += "职业:" + TextBox2.Text + "<br>";
Label1.Text += "爱好:" + TextBox1.Text + "<br>";
}
隐藏域:
private void Page_Load(object sender, System.EventArgs e)
{
if(!IsPostBack)
Response.Write(Hidden1.Value);
}
关于Cookie的使用
private void Page_Load(object sender, System.EventArgs e)
{
string strMessage;
if (Request.Cookies["username"]!=null)
strMessage = "亲爱的"+Request.Cookies["username"].Value+",欢迎登录本网站!";
else
strMessage = "欢迎登录本网站!";
Response.Write(strMessage);
}
private void btnReg_Click(object sender, System.EventArgs e)
{
Response.Cookies["username"].Value = tbUserName.Text;
Response.Cookies["username"].Expires = DateTime.Now.AddMinutes(10);
}
Post方法和查询字符串的
<form action="ShowMessage.aspx" method="post">
传值
if(!IsPostBack)
{
Response.Write(Server.MapPath("input.aspx"));
LabelName.Text = "您的姓名是:" + Request.Form["username"];
LabelSex.Text = "您的性别为:"+Request["sex"];
LabelEmail.Text = "您的邮件地址为:" + Request["Mailaddress"];
LabelAddress.Text = "您的地址为:" + Request["address"];
LabelCity.Text = "您所在的城市为:" + Request["city"];
LabelItem.Text = "您选择的班级为:" + Request["item"];
LabelMemo.Text = "您的留言为:" + Request["memo"];
}
Get传参
private void btnSubmit_Click(object sender, System.EventArgs e)
{
Response.Redirect("Read.aspx?username="+tbUseName.Text+"&password="+tbPass.Text);
}
private void Page_Load(object sender, System.EventArgs e)
{
Response.Write("您的用户名称为:"+Request.Params["username"]+"<br>");
Response.Write("您的密码为:"+Request.Params["password"]+"<br>");
}
Application对象的使用
private void Page_Load(object sender, System.EventArgs e)
{
Application.Lock();
if(Application["counter"]!=null)
Application["counter"] = Convert.ToInt32(Application["counter"])+1;
else
Application["counter"] = 1;
Application.UnLock();
lbInfo.Text = "您是第"+Application["counter"]+"位访问者!";
}
Session的使用
private void btnOk_Click(object sender, System.EventArgs e)
{
Session["username"] = tbUseName.Text;
Session["password"] = tbPass.Text;
Response.Redirect("ShowSession.aspx");
}
private void Page_Load(object sender, System.EventArgs e)
{
Response.Write("您的用户名是:"+Session["username"]+"<br>");
Response.Write("您的密码为:"+Session["password"].ToString());
}
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