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How to count duplicates from ListBox and show the number of duplicated items beside it?

So I have a button, where if you click it, it adds "Candy" to a listbox, how do I make it so, if another item with the same name is being added, instead of adding it in a new line, update the first line to show x2, 3, 4, etc. Is that possible or would I have to make another Listbox and match the index? I've tried the following with another listbox and an int variable.
private void btnCandy_Click(object sender, EventArgs e)
{
lstProducts.Items.Add("Candy");
foreach (var item in lstProducts.Items)
{
if (item.ToString() == "Candy")
{
++Productcount;
lstQuantity.Items.Add(Productcount);
if (Productcount > 1)
{
lstQuantity.Items.Insert(lstProducts.Items.IndexOf("Candy"), Productcount);
}
}
}
}

using System.Text.RegularExpressions;
Use:
private void btnCandy_Click(object sender, EventArgs e)
{
string query = "Candy";
bool isExist = false;
for (int i = 0; i < lstProducts.Items.Count; i++)
{
var s = lstProducts.Items[i].ToString();
if (s.StartsWith(query))
{
if (s == query)
{
lstProducts.Items[i] = query + "x2";
isExist = true;
break;
}
else
{
// Escape your plain text before use with regex
var pattern = Regex.Escape(query);
// Check if s has this formnat: queryx2, queryx3, queryx4, ...
Match m = Regex.Match(s, "^" + pattern + #"x(\d+)$");
if (m.Success)
{
lstProducts.Items[i] = query + "x" + (Int32.Parse(m.Groups[1].Value) + 1);
isExist = true;
break;
}
}
}
}
if (!isExist) lstProducts.Items.Add(query);
}
Note:
\d mean any digit (0 - 9)

I'd try to iterate through listbox items and if I find "Candy" then take that index and update title.
private void btnCandy_Click(object sender, EventArgs e)
{
bool found = false;
foreach (var item in lstProducts.Items)
{
if (item.ToString().StartsWith("Candy"))
{
// update item title
found = true;
break; // no need to continue
}
}
if(!found)
{
lstProducts.Items.Add("Candy");
}
}
this way you are not going to add duplicates

Here is some pseudo-code to help you. Add this to your button click event:
int i = 0;
foreach (string item in listbox1.Items)
{
If (item == textbox1.text) //textbox1.text contains the string such as 'candy'
{
i++;
listbox1.Items.Remove(item);
listbox1.Items.Add(textbox1.text + " " + i.ToString());
}
}
You may have to reset the counter as needed.

Search string in Listbox

I'm having troubles finding a string into a listbox, my string NombreCompleto is made of 3 strings that I previously had read from a file(ESSD), after I had recovered this string, I want to know if this string is in my listbox3, I tried several methods but it doesnt seem to work.
Here is my code.
foreach (string h in Directory.EnumerateFiles(NomDirec, "resume*"))
{
this.listBox1.Items.Add(h);
var NombreLinea = File.ReadLines(h);
foreach (string item in NombreLinea)
{
NombreAbuscar.Add(item.Remove(item.IndexOf(':')));
this.listBox3.Items.Add(item.Remove(item.IndexOf(':')));
}
foreach (string t in Directory.EnumerateFiles(NomDirec, "ESSD1*"))
{
string[] Nombre = File.ReadLines(t).ElementAtOrDefault(6).Split(':');
string[] ApellidoPat = File.ReadLines(t).ElementAtOrDefault(7).Split(':');
string[] ApellidoMat = File.ReadLines(t).ElementAtOrDefault(8).Split(':');
string NombreCompleto = ApellidoPat[1]+" "+ ApellidoMat[1] +","+" "+ Nombre[1];
string Nom2 = NombreCompleto.ToString();
int index = listBox3.FindString(Nom2);
if (index != -1)
{
this.listBox1.Items.Add(t);
MessageBox.Show("Find It");
}
else { MessageBox.Show("Not Found :#"); }
}

You can try with this code - based on Linq operator Where, ...
var selectedItems = from li in listBox3.Items
where li.Text == Nom2
select li.Text;
if(selectedItems.Any())
....

Try this out:
int index = -1;
for (int i = 0; i < listBox3.Items.Count; ++i)
if (listBox3.Items[i].Text == Nom2) { index = i; break; }
if (index != -1)
{
this.listBox1.Items.Add(t);
MessageBox.Show("Find It");
}
else { MessageBox.Show("Not Found :#");

Really easy way to find if a certain string is in a listbox.
private void btnAddRecipe_Click(object sender, EventArgs e)
{
bool DoesItemExist = false;
string searchString = txtRecipeName.Text;
int index = lstRecipes.FindStringExact(searchString, -1);
if (index != -1) DoesItemExist = true;
else DoesItemExist = false;
if (DoesItemExist)
{
//do something
}
else
{
MessageBox.Show("Not found", "Message", MessageBoxButtons.RetryCancel, MessageBoxIcon.Stop);
}
PopulateRecipe();
}

Datagridview sorting column based on matching string

I have a datagridview that I would like to have rows sorted based on the portion of a string entered from a user. The entered string is compared with all of the strings in a particular column. For instance, if I gave "comp" as the search word, the program would try to compare the search word with the strings on first column and sort the rows in a descending order which starts with "comp", such as "compare", "composition", "computer" etc. Rest of the words that do not match is either left alone or sorted in an alphabetical order (whichever is easier).
In LINQ, I am aware that you can apply the following code to achieve what you wanted with a string array:
var sortedWords = words.Where(x => x.Contains("comp"))
.OrderByDescending(x => x);
How can I achieve the same thing in Datagridview as I need to have the rows sorted, not just the items inside a particular column?
Edit:
The following code is giving a System.InvalidOperationException. (SetCurrentCellAddressCore is being called twice)
private void DGVPointCtrl_CellEndEdit(object sender, DataGridViewCellEventArgs e)
{
MatchComparer mc = new MatchComparer();
DGVPointCtrl.Sort(mc); //Error
}
I'm probably doing something wrong but I'm not sure why. Here is the code that programatically adds the rows for testing purposes:
private void BtnRefresh_Click(object sender, EventArgs e)
{
try
{
DGVPointCtrl.Rows.Clear();
int mainIndex = CmbMainDevice.SelectedIndex;
int subIndex = CmbSubDevice.SelectedIndex;
DDCDAO ddcdao = new DDCDAO(DDCGlobal.ddcEngineIP, ddc.Ip);
string pointListType;
object rs;
//Currently only supports IO DDC Request
//TO DO: Change DDCDAO to send proper subdevice requests
if (mainIndex == 0) //IO
{
#region Main Device: IO
}
//First row is for searching items
DGVPointCtrl.Rows.Add(new DataGridViewRow());
for (int i = 1; i < 5; i++)
{
DGVPointCtrl.Rows.Add(new DataGridViewRow());
DGVPointCtrl.Rows[i].ReadOnly = true;
}
DGVPointCtrl.Columns[0].SortMode = DataGridViewColumnSortMode.Programmatic;
DGVPointCtrl.Rows[0].DefaultCellStyle.Font =
new Font(DGVPointCtrl.DefaultCellStyle.Font, FontStyle.Italic | FontStyle.Bold);
if (subIndex == 1) //BI
{
PointDGVColumnGenerate("IO_BI");
}
else if (subIndex == 2) //BO
{
PointDGVColumnGenerate("IO_BO");
}
else if (subIndex == 3) //AI
{
PointDGVColumnGenerate("IO_AI");
}
else if (subIndex == 4) //AO
{
PointDGVColumnGenerate("IO_AO");
}
DGVPointCtrl.Rows[1].Cells[0].Value = "IO12314";
DGVPointCtrl.Rows[2].Cells[0].Value = "IO21948";
DGVPointCtrl.Rows[3].Cells[0].Value = "IO28194";
DGVPointCtrl.Rows[4].Cells[0].Value = "VP12984";
DGVPointCtrl.Rows[2].Cells[1].Value = "asdf";
#endregion
}
catch
{
}
}
private void PointDGVColumnGenerate(string key)
{
int colCount = 0;
DGVColumnTable.Clear();
for (int i = 0; i < COL_MAX; i++)
{
DGVPointCtrl.Columns[i].HeaderText = " ";
DGVPointCtrl.Columns[i].Visible = true;
}
foreach (string s in UIConstant.DDCPCtrlListColumnText[key])
{
DGVPointCtrl.Columns[colCount].HeaderText = s;
DGVColumnTable.Add(DGVPointCtrl.Columns[colCount]);
colCount++;
}
}
Edit2:
public class MatchComparer : IComparer
{
private static IComparer defaultComparer = new CaseInsensitiveComparer();
int IComparer.Compare(object x, object y)
{
DataGridViewRow xr = (DataGridViewRow)x;
DataGridViewRow yr = (DataGridViewRow)y;
string xs = "";
string ys = "";
try
{
xs = xr.Cells[0].Value.ToString();
}
catch
{
}
try
{
ys = yr.Cells[0].Value.ToString();
}
catch
{
}
if (HasMatch(xs) && !HasMatch(ys)) return -1;
else if (!HasMatch(xs) && HasMatch(ys)) return 1;
else return defaultComparer.Compare(xs, ys);
}

This is possible only if you are populating the grid yourself as opposed to binding it to the database.
Set DataGridViewColumn.SortMode to Programmatic.
Use DataGridView.Sort to impose a comparer like this:
public class MatchComparer : IComparer {
int IComparer.Compare(object x, object y) {
if (HasMatch(x) && !HasMatch(y)) return -1;
else if (!HasMatch(x) && HasMatch(y)) return 1;
else return defaultComparer.Compare(x, y);
}
private bool HasMatch(object x) {
return x is string && ((string)x).StartsWith("comp");
}
private static IComparer defaultComparer = new CaseInsensitiveComparer();
}

How do I change the text of a ComboBox item?

I have a combobox filed with the name of dataGridView columns, can I change the text of displayed items in the comboBox to any text I want ?
for (int i = 0; i < dataGridView1.Columns.Count; i++)
{
if (dataGridView1.Columns[i].ValueType == typeof(string) &&
i != 6 &&
i != 7 &&
i != 8 &&
i != 9)
comboBox1.Items.Add(dataGridView1.Columns[i].Name);
}
comboBox1.SelectedIndex = 0;

I hope this helps you:
combobox.Items[combobox.FindStringExact("string value")] = "new string value";
The FindStringExact method returns the index of an specific item text, so this can be a better way to change the text of a Combobox item.
Note: This works fine on C#.

If the value you want to use is not suitable as the text in a combobox, I usually do something like this:
public class ComboBoxItem<T> {
public string FriendlyName { get; set; }
public T Value { get; set; }
public ComboBoxItem(string friendlyName, T value) {
FriendlyName = friendlyName;
Value = value;
}
public override string ToString() {
return FriendlyName;
}
};
// ...
List<ComboBoxItem<int>> comboBoxItems = new List<ComboBoxItem<int>>();
for (int i = 0; i < 10; i++) {
comboBoxItems.Add(new ComboBoxItem<int>("Item " + i.ToString(), i));
}
_comboBox.DisplayMember = "FriendlyName";
_comboBox.ValueMember = "Value";
_comboBox.DataSource = comboBoxItems;
_comboBox.SelectionChangeCommitted += (object sender, EventArgs e) => {
Console.WriteLine("Selected Text:" + _comboBox.SelectedText);
Console.WriteLine("Selected Value:" + _comboBox.SelectedValue.ToString());
};

Try this:
ListItem item = comboBox1.Items.FindByText("<Text>");
if (item != null)
{
item.Text = "<New Text>";
}

May be instead of changing the text it would be simple to remove the item from a particular index and insert new item at same index with new text

You can simply change combo box items text by :
my_combo.Items [i_index] = "some string";

The best way you can do that is in this way:
ui->myComboBox->setItemText(index,"your text");

How do I edit the name of an item in a CheckedListBox?

I have a CheckedListBox that has X number of items. These items are placed there at runtime. These items are supposed to represent reports that can be displayed in the DataGridView. What I need to do now is display the record count for each report in parenthesis right next to the report name. I tried, not for too long, to edit the actual name of the item but couldn't find out how to do it. So then, I brute forced it. Saved the items to an array, cleared the items, appended the record counts to each item in the array, created new items. Well, this has caused issues because now it's not retaining my checks and the reason why is because whenever I generate the reports, I clear the items and recreate them. Well, rather than doing another foreach loop to save the checked status, does anyone know of a way to change the text of existing items in a CheckedListBox?
Here is the code I currently have:
In the MainForm.Designer.cs:
this.clbReports.Items.AddRange(new object[] {
"Report 1",
"Report 2",
"Report 3",
"Report 4",
"Report 5",
"Report 6",
"Report 7",
"Report 8",
"Report 9",
"Report 10",
"Report 11"});
And it looks like:
And I want it to look like (but there won't all be 0's):
Here is the SelectedIndexChanged function:
private void clbReports_SelectedIndexChanged(object sender, EventArgs e)
{
string strCheckBox = clbReports.SelectedItem.ToString();
bool bShowAllIsChecked = clbReports.GetItemChecked(clbReports.FindString("Show All Error Reports"));
bool bSelected = clbReports.GetItemChecked(clbReports.FindString(strCheckBox));
int nIndex = -1;
if (strCheckBox.Contains("Show All Error Reports"))
{
foreach (string str in _strReports)
{
if (!str.Contains("Show All Error Reports") && !str.Contains("Show Tagged Records"))
{
nIndex = clbReports.FindString(str);
if (nIndex > -1)
{
clbReports.SetItemChecked(nIndex, bSelected);
}
}
}
}
else
{
if (strCheckBox.Contains("Show All Error Reports") || bShowAllIsChecked)
{
foreach (string str in _strReports)
{
nIndex = clbReports.FindString(str);
if (nIndex > -1)
{
clbReports.SetItemChecked(nIndex, false);
}
}
}
nIndex = clbReports.FindString(strCheckBox);
if (nIndex > -1)
{
clbReports.SetItemChecked(nIndex, bShowAllIsChecked ? true : bSelected);
}
}
string[] strCheckedItems = new string[clbReports.CheckedItems.Count];
clbReports.CheckedItems.CopyTo(strCheckedItems, 0);
List<string> checkBoxReportFilter = new List<string>();
foreach (ReportRecord obj in this._lstReportRecords)
{
foreach (string str in strCheckedItems)
{
if (str.Contains(obj.Description))
{
checkBoxReportFilter.Add(obj.PartID.ToString());
}
}
}
try
{
if (checkBoxReportFilter.Count == 0 && clbReports.CheckedItems.Count > 0)
{
throw new NullReferenceException();
}
_strReportFilter = String.Join(",", checkBoxReportFilter.ToArray());
}
catch (NullReferenceException)
{
_strReportFilter = "-1";
}
generateReport();
}
And here is the code where I am clearing the items, getting the report counts and creating the new items.
_lstReportRecords = _dataController.ReportList;
bool[] bChecked = new bool[clbReports.Items.Count];
int nCounter = 0;
foreach (string str in _strReports)
{
foreach (string str2 in clbReports.SelectedItems)
{
bChecked[nCounter] = str2.Contains(str);
}
nCounter++;
}
clbReports.Items.Clear();
nCounter = 0;
foreach (string str in _strReports)
{
int nCount = _lstReportRecords.Where<ReportRecord>(delegate(ReportRecord rr) {
return rr.Description == str;
}).Count();
string newReport = str + " (" + nCount + ")";
clbReports.Items.Add(newReport);
clbReports.SetItemChecked(nCounter, bChecked[nCounter]);
nCounter++;
}
Please tell me there is an easier way to do this. I tried doing foreach loops through the clbReports.Items but it wants me to cast it to a string (errored on me when trying to cast to a CheckBox) so I couldn't change the value. And even if I could cast it to a CheckBox, I have a feeling it will give me the error that Enumeration has failed because the list has been changed (or however they word it). Any and all help is welcome. Thanks.
Edit: Please know that the Report X are just so that the actual report names aren't displayed to keep it generic. However, in the code, I just copied and pasted so the Show All Error Reports and Show All Tagged Records are reports I need to check.

The right ( == most simple and most direct) answer and solution is:
this.clbReports.Items[nIndex] = "new text of the item"
yes, those items are of type "object". No, nobody minds that, string is an object too ;)

If I were you, I'd try to give the INotifyPropertyChanged Interface a go.
You Shouldn't mess with events unless necessary. this will mean you can't use the designer to create the items, but as far as I've understood, it's a runtime-modified list anyway...
In detail:
• Create A Class (e.g.'Foo') that Implements INotifyPropertyChanged (Basically this will tell any listener that the text property has changed). This class will hold the names of all entries.
• create an ObservableCollection and bind your CheckedListBox to that Collection. In WinForms you will have to create a DataBindingSource and plug your Collection to one end and the ComboBox to the other end.
• Any change made to the collection will be visible in the control.
HTH
Sebi

In order to change the items in a ListBox (or a CheckedListBox), you should change these items' ToString() result.
The easiest solution would be to create a "Holder" class, which has a reference to the report it represents. Then the Holder class' ToString() method should be something like this:
public override string ToString()
{
return String.Format("{0} ({1})", BaseStr, MyReport.RecordCount);
}
If you change MyReport.RecordCount somehow (because a report's record count changes), you can just call clbReports.Refresh(), and it'll automatically show the new value.
I think this way you don't even need the temporary array solution in the second code block; however, I'd like to suggest an alternative way of getting the item's checked state.
You can iterate through the clbReports.CheckedIndices, and fill your bChecked array with true values only for indices in that array.

Well, due to time constraints I tried something else. I went with a ListView where CheckBoxes = true and View = List. I also removed Show All Error Reports and Show Tagged Records to checkboxes outside of the list. This made it a lot easier to do the functions I wanted. Here is the new code.
MainForm.Designer.cs
//
// cbTaggedRecords
//
this.cbTaggedRecords.AutoSize = true;
this.cbTaggedRecords.Location = new System.Drawing.Point(151, 9);
this.cbTaggedRecords.Name = "cbTaggedRecords";
this.cbTaggedRecords.Size = new System.Drawing.Size(106, 17);
this.cbTaggedRecords.TabIndex = 3;
this.cbTaggedRecords.Text = "Tagged Records";
this.cbTaggedRecords.UseVisualStyleBackColor = true;
this.cbTaggedRecords.CheckedChanged += new System.EventHandler(this.ShowTaggedRecords_CheckChanged);
//
// cbAllErrorReports
//
this.cbAllErrorReports.AutoSize = true;
this.cbAllErrorReports.Location = new System.Drawing.Point(6, 9);
this.cbAllErrorReports.Name = "cbAllErrorReports";
this.cbAllErrorReports.Size = new System.Drawing.Size(102, 17);
this.cbAllErrorReports.TabIndex = 2;
this.cbAllErrorReports.Text = "All Error Reports";
this.cbAllErrorReports.UseVisualStyleBackColor = true;
this.cbAllErrorReports.CheckedChanged += new System.EventHandler(this.ShowAllErrorReports_CheckChanged);
//
// listView1
//
this.listView1.CheckBoxes = true;
listViewItem1.StateImageIndex = 0;
listViewItem2.StateImageIndex = 0;
listViewItem3.StateImageIndex = 0;
listViewItem4.StateImageIndex = 0;
listViewItem5.StateImageIndex = 0;
listViewItem6.StateImageIndex = 0;
listViewItem7.StateImageIndex = 0;
listViewItem8.StateImageIndex = 0;
listViewItem9.StateImageIndex = 0;
this.listView1.Items.AddRange(new System.Windows.Forms.ListViewItem[] {
listViewItem1,
listViewItem2,
listViewItem3,
listViewItem4,
listViewItem5,
listViewItem6,
listViewItem7,
listViewItem8,
listViewItem9});
this.listView1.Location = new System.Drawing.Point(6, 29);
this.listView1.Name = "listView1";
this.listView1.Size = new System.Drawing.Size(281, 295);
this.listView1.TabIndex = 1;
this.listView1.UseCompatibleStateImageBehavior = false;
this.listView1.View = System.Windows.Forms.View.List;
this.listView1.ItemChecked += new System.Windows.Forms.ItemCheckedEventHandler(this.listView_ItemChecked);
MainForm.cs
private void listView_ItemChecked(object sender, ItemCheckedEventArgs e)
{
if (e != null)
{
int nLength = e.Item.Text.IndexOf("(") - 1;
string strReport = nLength <= 0 ? e.Item.Text : e.Item.Text.Substring(0, nLength);
if (e.Item.Checked)
{
_lstReportFilter.Add(strReport);
}
else
{
_lstReportFilter.Remove(strReport);
}
}
List<string> checkBoxReportFilter = new List<string>();
foreach (ReportRecord obj in this._lstReportRecords)
{
foreach (string str in _lstReportFilter)
{
if (str.ToLower().Contains(obj.Description.ToLower()))
{
checkBoxReportFilter.Add(obj.PartID.ToString());
}
}
}
try
{
if (checkBoxReportFilter.Count == 0 && listView1.CheckedItems.Count > 0)
{
throw new NullReferenceException();
}
_strReportFilter = String.Join(",", checkBoxReportFilter.ToArray());
}
catch (NullReferenceException)
{
_strReportFilter = "-1";
}
if (!bShowAll)
{
generateReport();
}
}
private void ShowAllErrorReports_CheckChanged(object sender, EventArgs e)
{
bShowAll = true;
foreach (ListViewItem lvi in listView1.Items)
{
lvi.Checked = ((CheckBox)sender).Checked;
}
_lstReportFilter.Clear();
bShowAll = false;
generateReport();
}
private void ShowTaggedRecords_CheckChanged(object sender, EventArgs e)
{
bool bChecked = ((CheckBox)sender).Checked;
if (bChecked)
{
if (!_lstReportFilter.Contains("Show Tagged Records"))
{
_lstReportFilter.Add("Show Tagged Records");
}
}
else
{
_lstReportFilter.Remove("Show Tagged Records");
}
listView_ItemChecked(null, null);
}
Code to add counts to CheckBoxes
_lstReportRecords = _dataController.ReportList;
int nTotalCount = 0;
foreach (ListViewItem lvi in listView1.Items)
{
int nCount = _lstReportRecords.Where(rr => lvi.Text.Contains(rr.Description)).Count();
nTotalCount += nCount;
lvi.Text = (lvi.Text.Contains("(") ? lvi.Text.Substring(0, lvi.Text.IndexOf("(") + 1) : lvi.Text + " (") + nCount.ToString() + ")";
}
cbAllErrorReports.Text = (cbAllErrorReports.Text.Contains("(") ? cbAllErrorReports.Text.Substring(0, cbAllErrorReports.Text.IndexOf("(") + 1) : cbAllErrorReports.Text + " (") + nTotalCount.ToString() + ")";
int nTaggedCount = _lstReportRecords.Where(rr => rr.Description.Contains("Tagged")).Count();
cbTaggedRecords.Text = (cbTaggedRecords.Text.Contains("(") ? cbTaggedRecords.Text.Substring(0, cbTaggedRecords.Text.IndexOf("(") + 1) : cbTaggedRecords.Text + " (") + nTaggedCount.ToString() + ")";
Thank you all for your help and ideas.