Question

asp.net aspx？id={}的问题

我这样写出错，到底怎么改
string fid;
string jid;
string did;
string nid;
operdb odb = new operdb();
DataTable dt = new DataTable();
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
fid = Request["fid"].ToString();
jid = Request["jid"].ToString();
did = Request["did"].ToString();
nid = Request["nid"].ToString();
string id="";
if (id==fid)
{
string sql = "select * from info where fid='" + fid + "'";
dt = odb.ExeSql(sql).Tables[0];
this.Repeater1.DataSource = dt;
this.Repeater1.DataBind();
}
if (id==jid)
{
string sql = "select * from leader where jid='" + jid + "'";
dt = odb.ExeSql(sql).Tables[0];
this.Repeater1.DataSource = dt;
this.Repeater1.DataBind();
}
if (id==did)
{
string sql = "select * from dongtai where did='" + did + "'";
dt = odb.ExeSql(sql).Tables[0];
this.Repeater1.DataSource = dt;
this.Repeater1.DataBind();
}
if (id==nid)
{
string sql = "select * from news where nid='" + nid + "'";
dt = odb.ExeSql(sql).Tables[0];
this.Repeater1.DataSource = dt;
this.Repeater1.DataBind();
}
其中 string fid;
string jid;
string did;
string nid;
这四个ID是不同表里来的不同的ID
绑定页面里我这样写的
<a href="info.aspx?id=<%# DataBinder.Eval(Container.DataItem,"fid") %>"
<a href="info.aspx?id=<%# DataBinder.Eval(Container.DataItem,"jid") %>"
<a href="info.aspx?id=<%# DataBinder.Eval(Container.DataItem,"did") %>"
<a href="info.aspx?id=<%# DataBinder.Eval(Container.DataItem,"nid") %>"
请求高手帮忙
未将对象引用设置到对象的实例。出现这样的异常
看来就有null值
但我不知道怎么写才能接受数据
现在我
改成一下了还是出异常
fid = Request.QueryString["fid"].ToString();
jid = Request.QueryString["jid"].ToString();
did = Request.QueryString["did"].ToString();
nid = Request.QueryString["nid"].ToString();
// string id="";
if (fid!=null)
{
string sql = "select * from info where fid='" + fid + "'";
dt = odb.ExeSql(sql).Tables[0];
this.Repeater1.DataSource = dt;
this.Repeater1.DataBind();
}
....

Answer 1

看看数据库里面的ID是不是为空，打断点测试下。

Answer 2

是不是你的fid,jid,did,nid有null值啊？

Answer 3

Request.QueryString["fid"]