Question

每一句的注释。。protected void Page_Load(object sender, EventArgs e)

每一句的注释。。protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
if (Session["Uid"] == null)
{
Response.Redirect("login.aspx");
}
}
}

Answer 1

//页面Load事件
protected void Page_Load(object sender, EventArgs e)
{
//判断如果是首次加载
if (!IsPostBack)
{
//判断session中是否存在uid
if (Session["Uid"] == null)
{
//不存在则跳转页面到login.aspx
Response.Redirect("login.aspx");
}
}
}