建了一个窗体class.aspx,代码如下(省略了部分代码)
<td style="width: 205px; height: 61px">
<asp:Label ID="Label1" runat="server" Text="课程列表" Width="198px"></asp:Label>
<asp:DataList ID="DataList1" runat="server" DataSourceID="SqlDataSource1" RepeatColumns="1">
<ItemTemplate>
<a href='Video.aspx?Id=<%#Eval("CoId")%>'>
<%#Eval("CoName")%>
</a>
</ItemTemplate>
</asp:DataList>
<asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:NewNetConnectionString %>"
SelectCommand="SELECT [CoName], [CoId] FROM [Course]"></asp:SqlDataSource>
</td>在另外一个窗体video.aspx中如何获取窗体class.aspx中的CoId值呢?
我采取的办法是:在Video.aspx.cs文件中用 string strId = Request.QueryString["Id"].ToString()语句来获取,但调试显示的是“未将对象引用设置到对象的实例”,说明Id没获得值,如何才能获得这个值呢?
<td style="width: 205px; height: 61px">
<asp:Label ID="Label1" runat="server" Text="课程列表" Width="198px"></asp:Label>
<asp:DataList ID="DataList1" runat="server" DataSourceID="SqlDataSource1" RepeatColumns="1">
<ItemTemplate>
<a href='Video.aspx?Id=<%#Eval("CoId")%>'>
<%#Eval("CoName")%>
</a>
</ItemTemplate>
</asp:DataList>
<asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:NewNetConnectionString %>"
SelectCommand="SELECT [CoName], [CoId] FROM [Course]"></asp:SqlDataSource>
</td>在另外一个窗体video.aspx中如何获取窗体class.aspx中的CoId值呢?
我采取的办法是:在Video.aspx.cs文件中用 string strId = Request.QueryString["Id"].ToString()语句来获取,但调试显示的是“未将对象引用设置到对象的实例”,说明Id没获得值,如何才能获得这个值呢?
<ItemTemplate>
<a href='Video.aspx?Id=<%#Eval("CoId")%>'><%#Eval("CoName")%></a>
</ItemTemplate>
{
DataTable dtOne = new DataTable();
dtOne.Columns.Add("CoId", typeof(string));
dtOne.Columns.Add("CoName", typeof(string));
for (int j = 1; j < 10; j++)
{
DataRow dr1 = dtOne.NewRow();
dr1[0] = j.ToString();
dr1[1] = "链接第" + j + "几条数据"; dtOne.Rows.Add(dr1);
}
this.DataList1.DataSource = dtOne;
this.DataList1.DataBind();
//你也可以调用下面那个方法
//那这块就应该这么写
//this.DataList1.DataSource = ReturnDataTable("你的SQL语句比如select * from tableName");
//this.DataList1.DataBind(); //Video.aspx页面的代码是
//Response.Write(Request.QueryString["Id"] == null ? "为空" : Request.QueryString["Id"].ToString()); }
public static DataTable ReturnDataTable(string cmdtext)
{
SqlConnection cn = new SqlConnection();
cn.ConnectionString = "数据库连接字符串";
DataTable dt = new DataTable();
SqlCommand cmd = new SqlCommand();
cmd = new SqlCommand(cmdtext, cn);
cmd.CommandType = CommandType.Text; ;
SqlDataReader dr = null;
using (dr = cmd.ExecuteReader(CommandBehavior.CloseConnection))
{
dt.Load(dr);
}
return dt;
}
<td style="width: 205px; height: 61px">
<asp:Label ID="Label1" runat="server" Text="课程列表" Width="198px">
</asp:Label>
<asp:DataList ID="DataList1" runat="server">
<ItemTemplate>
<a href='Video.aspx?Id=<%#Eval("CoId")%>'>
<%#Eval("CoName")%>
</a>
</ItemTemplate>
</asp:DataList>
</td>