C# 一小段代码错误

显示全部楼层 · 2008-8-28 19:50:06

using System;
using System.Data;
using System.Configuration;
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 _Default : System.Web.UI.Page
{

protected void Page_Load(object sender, EventArgs e)

{

string sqlcon = Convert.ToString(ConfigurationManager.ConnectionStrings["SQLSERVER"]);

SqlConnection sqlconn = new SqlConnection(sqlcon);

sqlconn.Open();

string sql = "select * from ceshi";

SqlDataAdapter ds = new SqlDataAdapter(sql, sqlconn);

DataSet da = new DataSet();

ds.Fill(da,"ceshi");

DataTable dc = da.Tables[0];

int o = (int)dc.Rows[0]["Name"];

Label tb = new Label();

tb = (Label)Repeater1.FindControl("Label1");

if (o > 5 )

{

Response.Write(tb.Text.ToString() + "+++");

}

else

{

Response.Write(tb.Text.ToString() + "+++");

}

this.Repeater1.DataSource = da.Tables[0].DefaultView;

this.Repeater1.DataBind();

sqlconn.Close();

}
}
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未将对象引用设置到对象的实例。
Response.Write(tb.Text.ToString() + "+++");

千问 · 2008-8-28 19:50:06

tb = (Label)Repeater1.FindControl("Label1"); ======================================这一行你Repeater1没有找到Label1的控件Repeater会根据你帮定的数据源，产生多行，每行都会有一个Label1，你直接用Repeater去Find,你说他去找哪一行的？至少要确定在哪一行去找才可以。因为你这句没找到，所以 tb == null,你调用null.Text，当然就出[未将对象引用设置到对象的实例。 ]的异常了。...