我正在创建一个数据表并动态添加行，并且当没有记录显示为没有使用emptydatatext找到的记录时，我将数据绑定到gridview，但这不起作用。这是我的代码
protected void show_fence_report(object sender, EventArgs e)
{
int drp_fence_id = common.make_int(common.get_request("drp_fence"));
string fence_start_date_time1 = common.get_request("fence_start_date_time");
string fence_end_date_time1 = common.get_request("fence_end_date_time");
//Delete data from datatable and gridview
dt_fence.Clear();
if (gridview_fence.DataSource != null)
{
((DataView)gridview_fence.DataSource).Table.Clear();
}
gridview_fence.DataBind();
gridview_fence.EmptyDataText = "Records Not Found";
hid_fence_id.Value = drp_fence_id.ToString();
hid_fence_start_datetime.Value = fence_start_date_time1;
hid_fence_end_datetime.Value = fence_end_date_time1;
display_fence_report();
gridview_fence.EmptyDataText = "Records Not Found";
}
public void display_fence_report()
{
string fence_id1 = "", fence_name1, fence_type1 = "", fence_status;
float default_size = 100000, landmark_latitude1 = 0, landmark_longitude1 = 0, fence_latitude1 = 0, fence_longitude1 = 0, fence_size1 = 0, longitude_x = 0, latitude_y = 0;
int points_polygon = 0;
ArrayList vertices_x = new ArrayList();
ArrayList vertices_y = new ArrayList();
query = "select latitude,longitude,added_date_time,speed,location,(select object_value from tracking_master_objects where object_id = a.object_id) as object from tracking_data_domain a where object_id in(select object_id from tracking_assign_fence a where fence_id = '" + hid_fence_id.Value + "' and is_active = '1') and (added_date_time between convert(datetime, '" + hid_fence_start_datetime.Value + "', 105) and convert(datetime, '" + hid_fence_end_datetime.Value + "', 105)) order by gps_id asc";
dr = common.run_query(query, db, cm, dr, 0);
if (dr.HasRows)
{
//To Build Fence Latitudes and Longitudes
query = "select fence_id,fence_name,fence_type,landmark_latitude,landmark_longitude,fence_latitude,fence_longitude,fence_size from tracking_master_fences where domain_id = '" + domain_id1 + "' and fence_id = '" + hid_fence_id.Value + "' and is_active = '1'";
dr2 = common.get_row(query, db2, cm2, dr2, 0);
if (dr2.HasRows)
{
fence_id1 = dr2["fence_id"].ToString();
fence_name1 = dr2["fence_name"].ToString();
fence_type1 = dr2["fence_type"].ToString();
landmark_latitude1 = common.make_float(dr2["landmark_latitude"].ToString());//fs_lat
landmark_longitude1 = common.make_float(dr2["landmark_longitude"].ToString());//fs_long
fence_latitude1 = common.make_float(dr2["fence_latitude"].ToString());//sec_lat
fence_longitude1 = common.make_float(dr2["fence_longitude"].ToString());//sec_long
fence_size1 = common.make_float(dr2["fence_size"].ToString());
}
dr2.Close();
//Build POlygon Vertices
if (fence_type1 == "4")
{
query = "select polygon_latitude,polygon_longitude from tracking_master_fence_polygons where fence_id = '" + hid_fence_id.Value + "' and domain_id = '" + domain_id1 + "'";
dr1 = common.run_query(query, db1, cm1, dr1, 0);
if (dr1.HasRows)
{
while (dr1.Read())
{
vertices_x.Add(dr1["polygon_latitude"]);
vertices_y.Add(dr1["polygon_longitude"]);
}
}
dr1.Close();
points_polygon = vertices_x.Count;
}
//Create a Datatable of 14 rows
dt_fence.Columns.Add("fence_id", typeof(string));
dt_fence.Columns.Add("Date", typeof(string));
dt_fence.Columns.Add("Speed", typeof(string));
dt_fence.Columns.Add("Location", typeof(string));
dt_fence.Columns.Add("landmark_latitude", typeof(string));
dt_fence.Columns.Add("landmark_longitude", typeof(string));
dt_fence.Columns.Add("fence_latitude", typeof(string));
dt_fence.Columns.Add("fence_longitude", typeof(string));
dt_fence.Columns.Add("latitude", typeof(string));
dt_fence.Columns.Add("longitude", typeof(string));
dt_fence.Columns.Add("fence_size", typeof(string));
dt_fence.Columns.Add("fence_type", typeof(string));
dt_fence.Columns.Add("fence_status", typeof(string));
dt_fence.Columns.Add("object", typeof(string));
while (dr.Read())
{
fence_status = "";
float latitude = common.make_float(dr["latitude"].ToString());
float longitude = common.make_float(dr["longitude"].ToString());
if (fence_type1 == "1" || fence_type1 == "2")
{
if (((landmark_latitude1 * 100000) < (latitude * 100000) && (fence_latitude1 * 100000) > (latitude * 100000)) && ((landmark_longitude1 * 100000) < (longitude * 100000) && (fence_longitude1 * 100000) > (longitude * 100000)))
{
fence_status = "Inside";
}
else
{
fence_status = "Outside";
}
}
else if (fence_type1 == "3")
{
float ft = ((latitude * 100000) - (landmark_latitude1 * 100000));
float st = ((longitude * 100000) - (landmark_longitude1 * 100000));
float sqrt = common.make_float(Math.Sqrt((ft * ft) + (st * st)).ToString());
if (fence_size1 < sqrt)
{
fence_status = "Out Side";
}
else
{
fence_status = "In Side";
}
}
else if (fence_type1 == "4")
{
longitude_x = common.make_float(dr["latitude"].ToString());
latitude_y = common.make_float(dr["longitude"].ToString());
int i = 0, j = 0, c = 0;
for (i = 0, j = points_polygon - 1; i < points_polygon; j = i++)
{
float vertices_y_i_val = common.make_float(vertices_y[i].ToString());
float vertices_y_j_val = common.make_float(vertices_y[j].ToString());
float vertices_x_i_val = common.make_float(vertices_x[i].ToString());
float vertices_x_j_val = common.make_float(vertices_x[j].ToString());
if (((vertices_y_i_val > latitude_y != (vertices_y_j_val > latitude_y)) &&
(longitude_x < (vertices_x_j_val - vertices_x_i_val) * (latitude_y - vertices_y_i_val) / (vertices_y_j_val - vertices_y_i_val) + vertices_x_i_val)))
{
c = 1;
}
}
if (c == 1)
{
fence_status = "In Side";
}
else
{
fence_status = "Out Side";
}
}
dt_fence.Rows.Add(fence_id1, dr["added_date_time"], dr["speed"], dr["location"], landmark_latitude1, landmark_longitude1, fence_latitude1, fence_longitude1, latitude, longitude, fence_size1, fence_type1, fence_status, dr["object"]);
}//End of while Loop
//hid_ds_fence.Value = dt_fence.ToString();
gridview_fence.DataSource = dt_fence;
gridview_fence.DataBind();
}
dr.Close();
fence_modalpopup.Show();
}
答案 0 :(得分：1)
在您的代码中，您在DataBind之后分配EmptyDataText值。它应该在DataBind之前。如果“消息”不会改变，您应该按照建议在HTML源代码中定义。
答案 1 :(得分：0)
你可以使用这样的东西
<Columns>
<Columns>
<EmptyDataTemplate>
<asp:Label ID="lblEmptydata" runat="server" Text="No Data here"></asp:Label>
</EmptyDataTemplate>
</asp:GridView>
或者可以试试这个
in my remark gridview's row_databoundevent i wrote
if (e.Row.Cells[0].Text == " ") // to display text when there is no data
{
e.Row.Cells[0].Text = "No Data Found";
}
或者也可以尝试这个
dt.Rows.Add(dt.NewRow());
grid1.DataSource = dt;
grid1.DataBind();
int totalcolums = grid1.Rows[0].Cells.Count;
grid1.Rows[0].Cells.Clear();
grid1.Rows[0].Cells.Add(new TableCell());
grid1.Rows[0].Cells[0].ColumnSpan = totalcolums;
grid1.Rows[0].Cells[0].Text = "No Data Found";