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How to assign methods to a dynamic created Gridview?

I have the following class which is the class for creating a gridview dynamic:
public class DynamicGridViewImageButtonTemplate : ITemplate
{
string _ColName;
DataControlRowType _rowType;
int _Count;
int _Kind;
public DynamicGridViewImageButtonTemplate(string ColName, DataControlRowType RowType, int Kind)
{
_ColName = ColName;
_rowType = RowType;
_Kind = Kind;
}
public void InstantiateIn(System.Web.UI.Control container)
{
switch (_rowType)
{
case DataControlRowType.DataRow:
if (_Kind == 0)
{
Label lbl = new Label();
lbl.DataBinding += new EventHandler(this.lbl_DataBind);
container.Controls.Add(lbl);
}
else
if (_Kind == 1)
{
ImageButton vImageButton = new ImageButton();
vImageButton.ID = "btnGetVoucher";
vImageButton.CommandArgument = string.Format("<%# Eval({0}) %>", "Voucher");
vImageButton.CssClass = "divButton";
vImageButton.Height = 25;
vImageButton.Width = 25;
vImageButton.Command += new CommandEventHandler(btnGetVoucher_Command);
vImageButton.DataBinding += new EventHandler(this.imgBtn_DataBind);
container.Controls.Add(vImageButton);
}
break;
default:
break;
}
}
and the following c# code for assigning methods runtime to the imagebutton which I have created in a column:
protected void btnGetVoucher_Command(object sender, CommandEventArgs e)
{
ImageButton btn = sender as ImageButton;
}
protected void gridview_RowCreated(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
ImageButton vImageButton = (ImageButton)e.Row.FindControl("btnGetVoucher");
vImageButton.Command += new CommandEventHandler(btnGetVoucher_Command);
}
}
and the creating of the gridcolumn is as follows:
GridView vGridView = new GridView();
vGridView.RowCreated += new GridViewRowEventHandler(gridview_RowCreated);
vTemplateField = new TemplateField();
vTemplateField.HeaderTemplate = new DynamicGridViewImageButtonTemplate("Voucher", DataControlRowType.Header, 0);
vTemplateField.ItemTemplate = new DynamicGridViewImageButtonTemplate("Voucher", DataControlRowType.DataRow, 1);
vGridView.Columns.Add(vTemplateField);
And at last the databind here:
private void imgBtn_DataBind(Object sender, EventArgs e)
{
ImageButton btn = (ImageButton)sender;
GridViewRow row = (GridViewRow)btn.NamingContainer;
btn.CommandArgument = DataBinder.Eval(row.DataItem, "Voucher").ToString();
}
But I can't step into the method btnGetVoucher_Command :-( I think that everything has been made correctly - but there must be something I have missed somewhere...
I can access the button in my Row_Created routine - but afterwards not use the GetVoucherCommand :-( the event is not fired :-(
So my question is why can't I step into that routine?
Thanks in advance,
Michael
Update:
The full class is here...
public class DynamicGridViewTextTemplate : ITemplate
{
string _ColNameText;
DataControlRowType _rowType;
public DynamicGridViewTextTemplate(string ColNameText, DataControlRowType RowType)
{
_ColNameText = ColNameText;
_rowType = RowType;
}
public void InstantiateIn(System.Web.UI.Control container)
{
switch (_rowType)
{
case DataControlRowType.Header:
Literal lc = new Literal();
lc.Text = "<b>" + _ColNameText + "</b>";
container.Controls.Add(lc);
break;
case DataControlRowType.DataRow:
ImageButton vImageButton = new ImageButton();
vImageButton.ID = "btnGetVoucher";
vImageButton.ImageUrl = "~/Images/Icons/icons8-download-from-the-cloud-50.png";
vImageButton.PostBackUrl = "#DownloadVoucher";
vImageButton.CommandArgument = string.Format("<%# Eval({0}) %>", "Voucher");
vImageButton.ToolTip = "Se og download bilag";
vImageButton.CssClass = "divButton";
vImageButton.Height = 25;
vImageButton.Width = 25;
vImageButton.DataBinding += new EventHandler(this.imgBtn_DataBind);
vImageButton.CommandName = "DownloadVoucher";
vImageButton.Command += new CommandEventHandler(btnGetVoucher_Command);
container.Controls.Add(vImageButton);
break;
default:
break;
}
}
private void imgBtn_DataBind(Object sender, EventArgs e)
{
ImageButton btn = (ImageButton)sender;
GridViewRow row = (GridViewRow)btn.NamingContainer;
btn.CommandArgument = DataBinder.Eval(row.DataItem, _ColNameText).ToString();
}
}
public class DynamicGridViewImageButtonTemplate : ITemplate
{
string _ColNameText;
DataControlRowType _rowType;
public DynamicGridViewImageButtonTemplate(string ColNameText, DataControlRowType RowType)
{
_ColNameText = ColNameText;
_rowType = RowType;
}
public void InstantiateIn(System.Web.UI.Control container)
{
switch (_rowType)
{
case DataControlRowType.Header:
Literal lc = new Literal();
lc.Text = "<b>" + _ColNameText + "</b>";
container.Controls.Add(lc);
break;
case DataControlRowType.DataRow:
ImageButton vImageButton = new ImageButton();
vImageButton.ID = "btnGetVoucher";
vImageButton.ImageUrl = "~/Images/Icons/icons8-download-from-the-cloud-50.png";
vImageButton.PostBackUrl = "#DownloadVoucher";
vImageButton.CommandArgument = string.Format("<%# Eval({0}) %>", "Voucher");
vImageButton.ToolTip = "Se og download bilag";
vImageButton.CssClass = "divButton";
vImageButton.Height = 25;
vImageButton.Width = 25;
vImageButton.DataBinding += new EventHandler(this.imgBtn_DataBind);
vImageButton.CommandName = "DownloadVoucher";
vImageButton.Command += new CommandEventHandler(btnGetVoucher_Command);
container.Controls.Add(vImageButton);
break;
default:
break;
}
}
protected void btnGetVoucher_Command(object sender, CommandEventArgs e)
{
ImageButton btn = sender as ImageButton;
}
private void imgBtn_DataBind(Object sender, EventArgs e)
{
ImageButton btn = (ImageButton)sender;
GridViewRow row = (GridViewRow)btn.NamingContainer;
btn.CommandArgument = DataBinder.Eval(row.DataItem, _ColNameText).ToString();
}
}
The events is here...
protected void gridview_RowCreated(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
ImageButton vImageButton = (ImageButton)e.Row.FindControl("btnGetVoucher");
}
}
protected void gridview_RowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
ImageButton vImageButton = (ImageButton)e.Row.FindControl("btnGetVoucher");
}
}
protected void gridview_RowCommand(object sender, CommandEventArgs e)
{
if (e.CommandName == "DownloadVoucher")
{
int index = Convert.ToInt32(e.CommandArgument);
GridView grid = sender as GridView;
GridViewRow row = grid.Rows[index];
ImageButton vImageButton = (ImageButton)row.FindControl("btnGetVoucher");
}
}
The creating of the gridview is here...
GridView vGridView = new GridView();
vGridView.AutoGenerateColumns = false;
vGridView.ShowHeaderWhenEmpty = true;
vGridView.ShowHeader = true;
vGridView.HeaderStyle.BackColor = System.Drawing.ColorTranslator.FromHtml("#C6E0B4");
vGridView.HeaderStyle.HorizontalAlign = HorizontalAlign.Left;
vGridView.RowCreated += new GridViewRowEventHandler(gridview_RowCreated);
vGridView.RowDataBound += new GridViewRowEventHandler(gridview_RowDataBound);
vGridView.RowCommand += new GridViewCommandEventHandler(gridview_RowCommand);
vTemplateField = new TemplateField();
vTemplateField.HeaderTemplate = new DynamicGridViewImageButtonTemplate("Voucher", DataControlRowType.Header);
vTemplateField.ItemTemplate = new DynamicGridViewImageButtonTemplate("Voucher", DataControlRowType.DataRow);
vGridView.Columns.Add(vTemplateField);

micheal.
in this code, i can't see event handling code in InstantiateIn method.
ex) like this.
lbl.DataBinding += new EventHandler(this.btnGetVoucher_Command);
DynamicGridViewTextTemplate class constructor args are 3 count.
but, when using DynamicGridViewTextTemplate constructor,
used only 2 count args.
where is kind?
try it.
vTemplateField.HeaderTemplate = new DynamicGridViewImageButtonTemplate("Voucher", DataControlRowType.Header, 0);
vTemplateField.ItemTemplate = new DynamicGridViewImageButtonTemplate("Voucher", DataControlRowType.DataRow, 1);
best example in msdn
https://learn.microsoft.com/ko-kr/dotnet/api/system.web.ui.webcontrols.templatefield.-ctor?view=netframework-4.8
I hope this answer helps you.

Dynamic controls dissapearing on postback

I am creating dynamic textboxes when clicking on a set of different radio button. Below is an example of two radio button onclick event.
protected void Checkbox1_CheckedChanged(object sender, EventArgs e)
{
string servicename = "service1";
if (checkbox1.Checked)
{
InputParameters.InputParameters aa= new InputParameters.InputParameters();
textbox = aa.GetInputFields(servicename);
for (int i=0;i<textbox.Count;i++)
{
// declare a textbox
TextBox CPDT = new TextBox();
CPDT.ID = servicename + i.ToString();
CPDT.CssClass = "form-control";
CPDT.EnableViewState = true;
Label lblCPD=new Label();
lblCPD.ID = "txtDynamiclbl" + servicename+ i.ToString();
lblCPD.CssClass= "form-control-label";
lblCPD.Text= textbox[i].ToString();
lblCPD.EnableViewState = true;
CPDPlaceHolder.Controls.Add(lblCPD);
CPDPlaceHolder.Controls.Add(CPDT);
//this.NumberOfControls++;
}
Button callSoap = new Button();
callSoap.ID = "txtDynamicSearch" + servicename;
callSoap.Text = "Search";
callSoap.CssClass = ".btn-info";
callSoap.CommandArgument = "test";
callSoap.Click += new EventHandler(btnsoap);
callSoap.EnableViewState = true;
CPDPlaceHolder.Controls.Add(callSoap);
}
else
{
}
}
protected void Checkbox2_CheckedChanged(object sender, EventArgs e)
{
string servicename = "service2";
if (checkbox2.Checked)
{
InputParameters.InputParameters aa = new InputParameters.InputParameters();
List<String> textbox = aa.GetInputFields("test1");
// textboxs.AddRange(textbox);
for (int i = 0; i < textbox.Count; i++)
{
// declare a textbox
TextBox CPDT = new TextBox();
CPDT.ID = servicename + i.ToString();
CPDT.CssClass = "form-control";
Label lblCPD = new Label();
lblCPD.ID = "txtDynamiclbl" + servicename + i.ToString();
lblCPD.CssClass = "form-control-label";
lblCPD.Text = textbox[i].ToString();
CPDPlaceHolder.Controls.Add(lblCPD);
CPDPlaceHolder.Controls.Add(CPDT);
}
Button callSoap = new Button();
callSoap.ID = "txtDynamicSearch" + servicename;
callSoap.Text = "Search";
callSoap.CssClass = ".btn-info";
callSoap.CommandArgument = "test1";
callSoap.Click += new EventHandler(btnsoap);
callSoap.EnableViewState = true;
CPDPlaceHolder.Controls.Add(callSoap);
}
else
{
}
}
The textboxes and search button appears as needed. The problem now is when i clicked on the search button a post back occur and all the controls are gone. I have been reading a lot about initialising the controls in page_preinit and i tried the code below.
protected void Page_PreInit(object sender, EventArgs e)
{
List<string> keys = Request.Form.AllKeys.Where(key => key.Contains("txtDynamic")).ToList();
int i = 1;
try
{
foreach (string key in keys)
{
TextBox CPDT = new TextBox();
CPDT.ID = "test" + i.ToString();
CPDT.CssClass = "form-control";
Label lblCPD = new Label();
lblCPD.ID = "txtDynamiclbl" + "test" + i.ToString();
lblCPD.CssClass = "form-control-label";
lblCPD.Text = textbox[i].ToString();
CPDPlaceHolder.Controls.Add(lblCPD);
CPDPlaceHolder.Controls.Add(CPDT);
i++;
}
}
catch
{
}
}
In the above function this line only returns the search button and not the texboxes. I am stuck on this issue.
List<string> keys = Request.Form.AllKeys.Where(key => key.Contains("txtDynamic")).ToList();
T

TweetInvi Listview can't get TweetID

I'm trying to get Tweet ID via TweetInvi API but always get null point exception. I'm out of options and can't understand what i did wrong. Here is my code. Problem occurs when i select desired Item from view and press retweet.
namespace MIF_TwitterApplication
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
Auth.SetUserCredentials("KEY", "KEY", "KEY",
"KEY");
}
private void Form1_Load(object sender, EventArgs e)
{
var user = User.GetAuthenticatedUser();
//PROFILE
profileImage.ImageLocation = user.ProfileImageUrlFullSize;
nameLabel.Text = user.Name;
usernameLabel.Text = "#" + user.ScreenName;
followersLabel.Text = "Followers: " + user.FollowersCount;
}
//Tweeting with PICS
private void tweetBtn_Click(object sender, EventArgs e)
{
if (tweetBox.Text != "")
{
if (imgUploadPath.Text != "")
{
byte[] file = File.ReadAllBytes(imgPreview.ImageLocation);
Tweet.PublishTweetWithImage(tweetBox.Text, file);
imgPreview.ImageLocation = "";
imgUploadPath.Text = "";
tweetBox.Clear();
MessageBox.Show("Tweet posted!");
}
else
{
Tweet.PublishTweet(tweetBox.Text);
MessageBox.Show("Tweet posted!");
tweetBox.Clear();
}
}
else
{
MessageBox.Show("Please enter text!");
tweetBox.Clear();
}
}
private void addImg_Click(object sender, EventArgs e)
{
OpenFileDialog ofd = new OpenFileDialog();
ofd.ShowDialog();
imgPreview.ImageLocation = ofd.FileName;
imgUploadPath.Text = ofd.FileName;
}
private void dropImg_Click(object sender, EventArgs e)
{
imgPreview.ImageLocation = "";
imgUploadPath.Text = "";
}
private void timelineBtn_Click(object sender, EventArgs e)
{
var user = User.GetAuthenticatedUser();
var getTweets = Timeline.GetHomeTimeline(40);
listView1.Clear();
listView1.View = View.Details;
listView1.GridLines = true;
listView1.FullRowSelect = true;
listView1.Columns.Add("Tweet", 570);
listView1.Columns.Add("Created By", 130);
listView1.Columns.Add("Create Time", 130);
listView1.Columns.Add("Likes", 60);
listView1.Columns.Add("Retweets", 70);
int x = 0;
foreach (var t in getTweets)
{
ListViewItem listItem = new ListViewItem(t.Text);
listItem.SubItems.Add(t.CreatedBy.ScreenName.ToString());
listItem.SubItems.Add(t.CreatedAt.ToString());
listItem.SubItems.Add(t.FavoriteCount.ToString());
listItem.SubItems.Add(t.RetweetCount.ToString());
listView1.Items.Add(listItem);
listView1.Items[x].Tag = t.Id;
}
}
private void postsBtn_Click(object sender, EventArgs e)
{
var user = User.GetAuthenticatedUser();
var getTweets = Timeline.GetUserTimeline(user, 40);
listView1.Clear();
listView1.View = View.Details;
listView1.GridLines = true;
listView1.FullRowSelect = true;
listView1.Columns.Add("Tweet", 570);
listView1.Columns.Add("Created By", 130);
listView1.Columns.Add("Create Time", 130);
listView1.Columns.Add("Likes", 60);
listView1.Columns.Add("Retweets", 70);
int x = 0;
foreach (var t in getTweets)
{
ListViewItem listItem = new ListViewItem(t.Text);
listItem.SubItems.Add(t.CreatedBy.ScreenName.ToString());
listItem.SubItems.Add(t.CreatedAt.ToString());
listItem.SubItems.Add(t.FavoriteCount.ToString());
listItem.SubItems.Add(t.RetweetCount.ToString());
listView1.Items.Add(listItem);
listView1.Items[x].Tag = t.Id;
}
}
private void retweetBtn_Click(object sender, EventArgs e)
{
var checkedItems = listView1.SelectedItems;
long a = (long)listView1.SelectedItems[0].Tag;
var user = User.GetAuthenticatedUser();
var retweet = Tweet.PublishRetweet(a);
MessageBox.Show("Retweet was successfull");
listView1.Items.Clear();
}
}
}
Breakes on long a, I can't figure out how to get that Long Tweet ID
Here is the full code

Problem was that my X was not incrementing correctly as it was out of for loop.
int x = 0;
foreach (var t in getTweets)
{
ListViewItem listItem = new ListViewItem(t.Text);
listItem.SubItems.Add(t.CreatedBy.ScreenName.ToString());
listItem.SubItems.Add(t.CreatedAt.ToString());
listItem.SubItems.Add(t.FavoriteCount.ToString());
listItem.SubItems.Add(t.RetweetCount.ToString());
listView1.Items.Add(listItem);
listView1.Items[x].Tag = t.Id;
x = x +1;
}

Listbox selectedindexchanged

private void cat_SelectedIndexChanged(object sender, EventArgs e)
{
ListBox listBox = (ListBox)sender;
ListBox lst = new ListBox();
lst.Attributes["class"] = "cat-list";
lst.Attributes["id"] = "ListBox" + id.ToString();
lst.Attributes["OnSelectedIndexChanged"] = "cat_SelectedIndexChanged";
lst.AutoPostBack = false;
lst.SelectedIndexChanged += cat_SelectedIndexChanged;
lst.DataSource = ktg.list(Convert.ToInt32(listBox.SelectedValue));
lst.DataTextField = "catName";
lst.DataValueField = "catId";
lst.DataBind();
Panel pnl = new Panel();
pnl.Attributes["class"] = "col-sm-2 col-xs-12";
pnl.Controls.Add(lst);
kategoriler.Controls.Add(pnl);
id++;
}
If autopostback=true, listbox don't keep selected but if autopostback=false, cat_selectedIndexChanged event not working. Please help me

Stay open context menu after click

I've got datagrid with context menu. It is initialized programatically:
contextMenu = new ContextMenu();
foreach (var col in this.Columns)
{
var checkBox = new MenuItem()
{
Header = col.Header
};
Binding myBinding = new Binding("Visibility");
myBinding.Mode = BindingMode.TwoWay;
myBinding.Converter = new IsCheckedToVisibilityConverter();
checkBox.DataContext = col;
checkBox.SetBinding(MenuItem.IsCheckedProperty, myBinding);
checkBox.Click += checkBox_Click;
checkBox.Checked += checkBox_Checked;
checkBox.Unchecked += checkBox_Unchecked;
contextMenu.Items.Add(checkBox);
}
It works great, but i would like to stay open context menu after check\uncheck menuitems. Any ideas ?

After adding checkBox.StaysOpenOnClick = true; works as expected
contextMenu = new ContextMenu();
foreach (var col in this.Columns)
{
var checkBox = new MenuItem()
{
Header = col.Header
};
//binding
Binding myBinding = new Binding("Visibility");
myBinding.Mode = BindingMode.TwoWay;
myBinding.Converter = new IsCheckedToVisibilityConverter();
checkBox.DataContext = col;
checkBox.SetBinding(MenuItem.IsCheckedProperty, myBinding);
checkBox.Click += checkBox_Click;
checkBox.Checked += checkBox_Checked;
checkBox.Unchecked += checkBox_Unchecked;
checkBox.StaysOpenOnClick = true;
contextMenu.Items.Add(checkBox);
}

You can try:
private bool close= true;
private void CheckBox1_CheckedChanged(Object sender, EventArgs e)
{
close= false;
}
private void contextMenu_Closing(object sender, ToolStripDropDownClosingEventArgs e)
{
e.Cancel = !close;
CloseContextMenu = true;
}