cs文件
public partial class zhihuijioashi : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
apDiv19.Visible = false;
apDiv20.Visible = true;
apDiv21.Visible = false;
apDiv22.Visible = true;
apDiv23.Visible = false;
apDiv24.Visible = true;
apDiv25.Visible = false;
apDiv26.Visible = true;
apDiv27.Visible = false;
apDiv28.Visible = true;
apDiv29.Visible = false;
apDiv30.Visible = true;
apDiv31.Visible = false;
apDiv32.Visible = true;
apDiv33.Visible = true;
apDiv34.Visible = true;
apDiv35.Visible = false;
apDiv36.Visible = true;
apDiv37.Visible = false;
apDiv38.Visible = true;
apDiv39.Visible = false;
apDiv40.Visible = true;
apDiv41.Visible = true;
apDiv42.Visible = false;
apDiv43.Visible = true;
apDiv44.Visible = false;
apDiv45.Visible = true;
apDiv46.Visible = false;
apDiv47.Visible = true;
apDiv48.Visible = false;
apDiv49.Visible = true;
apDiv50.Visible = false;
apDiv51.Visible = true;
apDiv52.Visible = false;
apDiv53.Visible = true;
apDiv54.Visible = true;
apDiv55.Visible = true;
apDiv56.Visible = false;
apDiv57.Visible = true;
apDiv58.Visible = false;
apDiv59.Visible = true;
apDiv60.Visible = false;
}
protected void ImageButton2_Click(object sender, ImageClickEventArgs e)
{
string classroom = TextBox1.Text.ToString(); string strConn;
SqlDataAdapter objDataAdapter;
strConn = "server=localhost;database=intelliCampus;Integrated Security=true";
SqlConnection myConn = new SqlConnection(strConn);
myConn.Open();
SqlCommand cmd = new SqlCommand("select * from '" + classroom + "'", myConn);
objDataAdapter = new System.Data.SqlClient.SqlDataAdapter("select [isBooked] from ["+classroom+"]", myConn);
DataTable dt = new DataTable();
objDataAdapter.Fill(dt);
// int[] a = new int[27];
int[] a = new int[dt.Rows.Count]; for (int i = 0; i < dt.Rows.Count; i++)
{ a[i] = Convert.ToInt16(dt.Rows[i]["isBooked"].ToString());
}
int m = 0;
for (int j = 0; j < 43; j++)
{
int n = j + 19; if (a[j] == 0)
{ FindControl("apDiv" + n.ToString()).Visible = false;//隐藏 在这提示System.NullReferenceException: 未将对象引用设置到对象的实例。 但是我写另一个页面时这样写没错误呀
m = m + 1; }
else
{
FindControl("apDiv" + n.ToString()).Visible = true;//显示
}
}
Label1.Text = Convert.ToString(m); myConn.Close();//关闭数据库的连接
myConn = null; }大家再看看别的地方还有没有错误呀
public partial class zhihuijioashi : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
apDiv19.Visible = false;
apDiv20.Visible = true;
apDiv21.Visible = false;
apDiv22.Visible = true;
apDiv23.Visible = false;
apDiv24.Visible = true;
apDiv25.Visible = false;
apDiv26.Visible = true;
apDiv27.Visible = false;
apDiv28.Visible = true;
apDiv29.Visible = false;
apDiv30.Visible = true;
apDiv31.Visible = false;
apDiv32.Visible = true;
apDiv33.Visible = true;
apDiv34.Visible = true;
apDiv35.Visible = false;
apDiv36.Visible = true;
apDiv37.Visible = false;
apDiv38.Visible = true;
apDiv39.Visible = false;
apDiv40.Visible = true;
apDiv41.Visible = true;
apDiv42.Visible = false;
apDiv43.Visible = true;
apDiv44.Visible = false;
apDiv45.Visible = true;
apDiv46.Visible = false;
apDiv47.Visible = true;
apDiv48.Visible = false;
apDiv49.Visible = true;
apDiv50.Visible = false;
apDiv51.Visible = true;
apDiv52.Visible = false;
apDiv53.Visible = true;
apDiv54.Visible = true;
apDiv55.Visible = true;
apDiv56.Visible = false;
apDiv57.Visible = true;
apDiv58.Visible = false;
apDiv59.Visible = true;
apDiv60.Visible = false;
}
protected void ImageButton2_Click(object sender, ImageClickEventArgs e)
{
string classroom = TextBox1.Text.ToString(); string strConn;
SqlDataAdapter objDataAdapter;
strConn = "server=localhost;database=intelliCampus;Integrated Security=true";
SqlConnection myConn = new SqlConnection(strConn);
myConn.Open();
SqlCommand cmd = new SqlCommand("select * from '" + classroom + "'", myConn);
objDataAdapter = new System.Data.SqlClient.SqlDataAdapter("select [isBooked] from ["+classroom+"]", myConn);
DataTable dt = new DataTable();
objDataAdapter.Fill(dt);
// int[] a = new int[27];
int[] a = new int[dt.Rows.Count]; for (int i = 0; i < dt.Rows.Count; i++)
{ a[i] = Convert.ToInt16(dt.Rows[i]["isBooked"].ToString());
}
int m = 0;
for (int j = 0; j < 43; j++)
{
int n = j + 19; if (a[j] == 0)
{ FindControl("apDiv" + n.ToString()).Visible = false;//隐藏 在这提示System.NullReferenceException: 未将对象引用设置到对象的实例。 但是我写另一个页面时这样写没错误呀
m = m + 1; }
else
{
FindControl("apDiv" + n.ToString()).Visible = true;//显示
}
}
Label1.Text = Convert.ToString(m); myConn.Close();//关闭数据库的连接
myConn = null; }大家再看看别的地方还有没有错误呀
好像你apDiv只到了60,而for循环中FindControl里面的apDiv到了61,如果a[42]==0,肯定会报null
for (int j = 0; j < 43; j++)
{
int n = j + 19; if (a[j] == 0)
{ FindControl("apDiv" + n.ToString()).Visible = false;//
FindControl()下面的apDiv到了61