if(Convert.ToString(Session["admin"])!= "")
{
imgedit.Visible=true;
imgquote.Visible=true;
}
如果Session["admin"]为空时,页面很正常,当登录以后session不为空时,提示这里出错:
Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.Source Error:
Line 38: if(Convert.ToString(Session["admin"])!= "")
Line 39: {
Line 40: imgedit.Visible=true;
Line 41: imgquote.Visible=true;
Line 42: }
怎么处理啊?
{
imgedit.Visible=true;
imgquote.Visible=true;
}
如果Session["admin"]为空时,页面很正常,当登录以后session不为空时,提示这里出错:
Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.Source Error:
Line 38: if(Convert.ToString(Session["admin"])!= "")
Line 39: {
Line 40: imgedit.Visible=true;
Line 41: imgquote.Visible=true;
Line 42: }
怎么处理啊?
验证登录的
private void Button1_Click(object sender, System.EventArgs e)
{
string strname,strpwd;
strname = txtusername.Text;
strpwd=txtpwd.Text;
if((strname==ConfigurationSettings.AppSettings["uid"])&&(strpwd==ConfigurationSettings.AppSettings["pwd"]))
{
Session["admin"] = strname;
Response.Redirect("default.aspx");
} }
<ItemTemplate>
---------
<td>asp:image imageurl="images/edit.gif" id="imgedit" runat="server" visible=False /> <asp:image imageurl="images/quote.gif" id="imgquote" runat="server" visible="False" />
-----
</ItemTemplate>
{
if(e.Item.ItemIndex > -1)
{
System.Web.UI.WebControls.Image img = (System.Web.UI.WebControls.Image)e.Item.FindControl("imgedit");
if(img != null)
{
if(Convert.ToString(Session["admin"])!= "")
{
imgedit.Visible=true;
} }
}
}
{
//输入框
if(e.Item.ItemType==ListItemType.EditItem)
{
TextBox txt1 = (TextBox)e.Item.Cells[0].Controls[0];
txt1.Width = 50;
txt1.Font.Size=9;
TextBox txt2 = (TextBox)e.Item.Cells[1].Controls[0];
txt2.Width = 250;
txt2.Font.Size=9;
TextBox txt3 = (TextBox)e.Item.Cells[2].Controls[0];
txt3.Width = 120;
txt3.Font.Size=9; //上传,取消按钮
Button btn1 = (Button)e.Item.Cells[3].Controls[0];
btn1.CssClass = "button";
Button btn2 = (Button)e.Item.Cells[3].Controls[2];
btn2.CssClass = "button";
} //编辑按钮
else if (e.Item.ItemIndex >= 0)
{
Button btnEdit = (Button)e.Item.Cells[3].Controls[0];
btnEdit.CssClass = "button";
}
//删除确认
switch(e.Item.ItemType)
{
case ListItemType.Item:
case ListItemType.AlternatingItem:
case ListItemType.EditItem:
{
Button btn = (Button)e.Item.FindControl("btnDelete");
btn.Attributes.Add("onclick", "return confirm('是否确定删除这条记录?');");
break;
}
}
}