<asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="Button" /></td>protected void Page_Load(object sender, EventArgs e)
{
Response.Write( Request.Form["txtName"]);
Session["Name"] = Request.Form["txtName"].ToString();
}
protected void Button1_Click(object sender, EventArgs e)
{
string Name;
Name = Session["Name"].ToString(); Label1.Text = Name;
}行 17: Session["Name"] = Request.Form["txtName"].ToString();异常详细信息: System.NullReferenceException: 未将对象引用设置到对象的实例。
{
Response.Write( Request.Form["txtName"]);
Session["Name"] = Request.Form["txtName"].ToString();
}
protected void Button1_Click(object sender, EventArgs e)
{
string Name;
Name = Session["Name"].ToString(); Label1.Text = Name;
}行 17: Session["Name"] = Request.Form["txtName"].ToString();异常详细信息: System.NullReferenceException: 未将对象引用设置到对象的实例。
改成
Session["Name"] = "aa"; //Request.Form["txtName"].ToString();
看会不会出错
{
Session["Name"] = Request.Form["txtName"].ToString();}
也许有时候可以取到值,而有时候不能,这个时候你就需要这个判断,防止出错