Question

c# 有内容但赋值为空

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;

public partial class ucNotice : System.Web.UI.UserControl
{

string myConnetionString = "server=;uid=sa;pwd=123456;database=b2b;";
SqlConnection myConnection = new SqlConnection();
string cmdString = "select * from notice";
SqlCommand myCommand;
SqlDataReader myReader;
string content;
LinkButton l;
protected void Page_Load(object sender, EventArgs e)
{
GridViewBind();

}
private void GridViewBind()
{
myConnection.ConnectionString = myConnetionString;

myConnection.Open();
myCommand = new SqlCommand(cmdString, myConnection);
myReader = myCommand.ExecuteReader();

DataList1.DataSource = myReader;

DataList1.DataBind();

this.DataList1.DataKeyField="content";
}

protected void SqlDataSource1_Selecting(object sender, SqlDataSourceSelectingEventArgs e)
{

}

public string Content()
{
return content;
}

protected void LinkButton1_Click(object sender, EventArgs e)
{

l.PostBackUrl = "~/ShowNotice.aspx";

myReader.Close();
myConnection.Close();
}
protected void DataList1_ItemDataBound(object sender, DataListItemEventArgs e)
{
l = (LinkButton)e.Item.FindControl("LinkButton1");
}
protected void DataList1_ItemCommand(object source, DataListCommandEventArgs e)
{
if(e.CommandName=="link1")
{

DataList1.SelectedIndex = e.Item.ItemIndex;
string content1 = DataList1.SelectedValue.ToString();
//就是上一句content1为空 ，奇怪的就是 DataList1.SelectedValue的值是一串中文哦 编译器上显示的我真的晕死，找了很多办法没撤。
string num = (string)DataList1.DataKeys[e.Item.ItemIndex];

}
}
}
在上面的方法体内无论什么字符串都不行自己打的都不行，一律为空，我的天，是不是电脑烧坏了脑子

若以下回答无法解决问题，邀请你更新回答

Answer 1

DataList1.SelectedValue这个东西是object类型的,不要直接用ToString()方法
你先在这里把DataList1.SelectedValue的类型转一下.

Answer 2

你的gridview 绑定 SqlDataReader myReader？？？？？？？？？？能绑定出来你查询出来的所有数据吗》？？？？？