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C# Virtual ListView extremely slow when using listView.View = View.LargeIcon

I am facing a problem when I try to use a ListView in virtual mode with LargeIcon images.
Let say that I want to show all the graphic files contained in a array of 2000 items (the average size of each file is 2MB):
if the ListView is set to Details the display is immediate and the scroll goes up and down very smoothly;
if, instead, the ListView is set to LargeIcon the display of the visible items takes a very long time and the scroll is virtually impossible.
Waiting enough time (tens of seconds) the display is correct and the icons show the right image.
If the array contains e.g. thousands of .PDF files the display and the scroll are very quick (almost the same of the Details view) and the images show are the right PDF icons.
What I would like to get is something similar to what Windows Explorer does, i.e. show a generic icon while scrolling (fast) and then, show the right images only when the scroll stops (takes some time).
Here it is the most relevant (I think) part of the code that I am using and thanks for any help:
// Based on the example given in: https://learn.microsoft.com/en-us/dotnet/api/system.windows.forms.listview.virtualmode?view=netframework-4.8
// Notes:
// The string[] array nameFoFi contains the list of the itens to be shown in ListView1 (drives or folders [and files]).
// When I fill the array nameFoFi I also set listView1.VirtualListSize = allFoFi.Count();
// If bViewDrives = True the array nameFoFi contains only drive names.
// ...
// ...
private ListViewItem[] lwiCache; //array to cache items for the virtual list
private int firstItem; //stores the index of the first item in the cache
// ...
// ...
listView1.VirtualMode = true;
//listView1.View = View.Details;
listView1.View = View.LargeIcon;
listView1.SmallImageList = new ImageList();
listView1.SmallImageList.ColorDepth = ColorDepth.Depth32Bit;
listView1.SmallImageList.ImageSize = new System.Drawing.Size(20, 20);
listView1.LargeImageList = new ImageList();
listView1.LargeImageList.ColorDepth = ColorDepth.Depth16Bit;
listView1.LargeImageList.ImageSize = new System.Drawing.Size(50, 50);
// ...
// ...
void listView1_RetrieveVirtualItem(object sender, RetrieveVirtualItemEventArgs e)
{
//check to see if the requested item is currently in the cache
if (lwiCache != null && e.ItemIndex >= firstItem && e.ItemIndex < firstItem + lwiCache.Length)
{
//A cache hit, so get the ListViewItem from the cache instead of making a new one.
e.Item = lwiCache[e.ItemIndex - firstItem];
}
else
{
//A cache miss, so create a new ListViewItem and pass it back.
string nameFoFi = allFoFi[e.ItemIndex];
e.Item = ListViewNewItem(nameFoFi);
}
}
void listView1_CacheVirtualItems(object sender, CacheVirtualItemsEventArgs e)
{
if (lwiCache != null && e.StartIndex >= firstItem && e.EndIndex <= firstItem + lwiCache.Length)
{
//If the newly requested cache is a subset of the old cache,
//no need to rebuild everything, so do nothing.
return;
}
//Now we need to rebuild the cache.
firstItem = e.StartIndex;
int length = e.EndIndex - e.StartIndex + 1; //indexes are inclusive
lwiCache = new ListViewItem[length];
lblCacheTime.Text = firstItem.ToString() + " " + length.ToString();
//Fill the cache with the appropriate ListViewItems.
for (int i = 0; i < length; i++)
{
string nameFoFi = allFoFi[i + firstItem];
lwiCache[i] = ListViewNewItem(nameFoFi);
}
}
private ListViewItem ListViewNewItem(string itemName)
{
string name;
ListViewItem lwItem;
if (bViewDrives)
{
name = itemName;
}
else
{
name = Path.GetFileName(itemName);
}
lwItem = new ListViewItem(name, 0);
lwItem.Tag = itemName;
{
if (listView1.View == View.Details)
{
lwItem.ImageIndex = GetListViewSmallIcons(itemName);
GetDetails(lwItem, itemName);
}
else
lwItem.ImageIndex = GetListViewUniIcons(itemName);
}
return lwItem;
}
// From: https://stackoverflow.com/questions/670546/determine-if-file-is-an-image
public static readonly List<string> ImageExtensions = new List<string> { ".JPG", ".JPE", ".BMP", ".GIF", ".PNG" };
private int GetListViewUniIcons(string nameFoFi)
{
int iconIndex = 0;
if (bViewDrives)
{
// Get the icon of the drive nameFoFi:
Icon iconFo = GetDriveIcon(nameFoFi, true);
listView1.SmallImageList.Images.Add(nameFoFi, iconFo.ToBitmap());
listView1.LargeImageList.Images.Add(nameFoFi, iconFo.ToBitmap());
iconIndex = listView1.SmallImageList.Images.Count - 1;
}
else if (Directory.Exists(nameFoFi))
{
// Get the icon of the folder nameFoFi:
Icon iconFo = GetFolderIcon(nameFoFi);
listView1.SmallImageList.Images.Add(nameFoFi, iconFo.ToBitmap());
listView1.LargeImageList.Images.Add(nameFoFi, iconFo.ToBitmap());
iconIndex = listView1.SmallImageList.Images.Count - 1;
}
else // IsFile:
{
if (ImageExtensions.Contains(Path.GetExtension(nameFoFi).ToUpperInvariant()) && bEndScroll)
{
// Get the image of the file nameFoFi:
Bitmap image = (Bitmap) Image.FromFile(nameFoFi); // <-- here is where most of the time is lost.
listView1.SmallImageList.Images.Add(nameFoFi, image);
listView1.LargeImageList.Images.Add(nameFoFi, image);
iconIndex = listView1.LargeImageList.Images.Count - 1;
}
else
{
// Get the icon of the file nameFoFi:
Icon iconFi = GetFileIcon(nameFoFi, Win32.IconSize.Large, false);
listView1.SmallImageList.Images.Add(iconFi.ToBitmap());
listView1.LargeImageList.Images.Add(nameFoFi, iconFi.ToBitmap());
iconIndex = listView1.SmallImageList.Images.Count - 1;
}
}
return iconIndex;
}

Overlapping in listview c#

Good day, I have a list view that looks like this.
My problem is that the name of the items are overlapping, that name is from the database, do i have to set something in the properties for it not to overlap?
form_load code
private void FormAdhocReport_Load(object sender, EventArgs e)
{
LoadReport();
ToolBar(sRights);
}
LoadReport code:
private void LoadReport()
{
dsReports.Clear();
this.listReports.Items.Clear();
adhoc.AccountRowID = CurrentUserNameRowID;
string sRetXMLValue = adhoc.get_sp_Reports_View_Owner();
string XMLDOC = sRetXMLValue;
ReadXMLData(XMLDOC);
ListReportData();
//int count = listReports.Items.Count;
}
ListReportDataCode:
private void ListReportData()
{
try
{
// Get the table from the data set
DataTable dtable = dsReports.Tables[0];
// Clear the ListView control
this.listReports.Items.Clear();
// Display items in the ListView control
for (int i = 0; i < dtable.Rows.Count; i++)
{
DataRow drow = dtable.Rows[i];
if (drow.RowState != DataRowState.Deleted)
{
// Define the list items
ListViewItem lvi = new ListViewItem(drow["ReportName"].ToString());
lvi.ImageIndex = 0;
lvi.SubItems.Add(drow["RowID"].ToString());
listReports.Items.Add(lvi);
}
}
}
catch { }
}
Don't mind this codes: string sRetXMLValue = adhoc.get_sp_Reports_View_Owner();
string XMLDOC = sRetXMLValue;
ReadXMLData(XMLDOC); because they're just for getting the data in the database.
Thanks in advance for your help.

calendar column c# in datagridview

Basically I want to show a calendar when I edit some columns in my Datagridview.
Following How to: Host Controls in Windows Forms DataGridView Cells from MSDN I can add wanted kind of column at building.
But in my case, I have to use a datasource provided by an Excel reader which give headings have to be connected to date type columns.
private DataGridView AddCalendars(DataGridView dtgv)
{
dtgv.DataSource = controller.getEmptyDataTable(); // DataTable provided by excel reader
var l = dtgv.Columns.Count;
string[] dateColumns = {"date_received", "date_of_birth"};
for (var i = 0; i < l; ++i)
{
if ( dateColumns.Any( dtgv.Columns[i].HeaderText.Contains )
{
dtgv.Columns[i] = new CalendarColumn(); // this line does not work cause by readonly
}
}
return dtgv;
}
How can I apply Calendar Column control to selected columns ?
Or, how can I obtain same result by building Datagridview different way ?

find an acceptable solution working around this post http://www.codeproject.com/Questions/175124/placing-datetimepicker-in-datagridview
private DateTimePicker cellDateTimePicker;
private List<int> dateColumnsIndexes;
public MainForm()
{
InitializeComponent();
///
this.cellDateTimePicker = new DateTimePicker();
this.cellDateTimePicker.ValueChanged += new EventHandler(cellDateTimePickerValueChanged);
this.cellDateTimePicker.Visible = false;
this.cellDateTimePicker.CustomFormat = "dd/MM/yyyy";
this.cellDateTimePicker.Format = DateTimePickerFormat.Custom;
this.dataGridView1.Controls.Add(cellDateTimePicker);
(...)
}
private void dataGridView1_CellBeginEdit(object sender, DataGridViewCellCancelEventArgs e)
{
var index = masterDataGridView.CurrentCell.ColumnIndex;
if (this.dateColumnsIndexes.Contains(index))
{
Rectangle tempRect = this.dataGridView1.GetCellDisplayRectangle(e.ColumnIndex, e.RowIndex, false);
cellDateTimePicker.Location = tempRect.Location;
cellDateTimePicker.Width = tempRect.Width;
try
{
cellDateTimePicker.Value = DateTime.Parse(dataGridView1.CurrentCell.Value.ToString());
}
catch
{
cellDateTimePicker.Value = DateTime.Now;
}
cellDateTimePicker.Visible = true;
}
}
void cellDateTimePickerValueChanged(object sender, EventArgs e)
{
masterDataGridView.CurrentCell.Value = cellDateTimePicker.Value.ToString("dd/MM/yyyy");
cellDateTimePicker.Visible = false;
}
private void AddCalendars(DataGridView dtgv)
{
dateColumnsIndexes = new List<int>();
dtgv.DataSource = controller.getEmptyDataTable(); // DataTable provided by excel reader
var l = dtgv.Columns.Count;
string[] dateColumns = {"date_received", "date_of_birth"};
for (var i = 0; i < l; ++i)
{
if ( dateColumns.Any( dtgv.Columns[i].HeaderText.Contains )
{
dateColumnsIndexes.add(i);
}
}
}

Combobox SelectedItem not working propely

I'm trying to retrieve the selected item from a combobox, though i can't get it to work.
Form1 form = new Form1();
string cpuCount = form.comboBox1.SelectedItem.ToString();
Now, this is not returning anything. BUT, if i insert this code in my InitializeComponent(), it selects item with index = 3, and return that proper item.
comboBox1.SelectedIndex = 3;
Why does it behave like this? If I now select for example item with index = 5, it still will think the selected item is the one with index = 3.
---------- I think i should expand to show you how my code looks.
Form1 - adding all items to the comboboxes.
public partial class Form1 : Form
{
Profile profile = new Profile();
public Form1()
{
InitializeComponent();
Profile profile = new Profile();
string[] prof = profile.getProfiles();
foreach (var item in prof)
{
comboBox5.Items.Add(Path.GetFileNameWithoutExtension(item));
}
int ram = 1024;
for (int i = 0; i < 7; i++)
{
comboBox4.Items.Add(ram + " GB");
ram = ram * 2;
}
int vram = 512;
string size;
for (int i = 0; i < 5; i++)
{
if(vram > 1000)
{
size = " GB";
}
else
{
size = " MB";
}
comboBox2.Items.Add(vram + size);
vram = vram * 2;
}
for (int i = 1; i < 5; i++)
{
comboBox1.Items.Add(i * 2);
}
for (int i = 0; i < 5; i++)
{
comboBox3.Items.Add(i * 2);
}
private void button3_Click(object sender, EventArgs e)
{
string current = profile.currentProfile();
profile.saveProfile(current);
}
}
So, button3 is my "save"button.
And here is my "Profile"-class
class Profile
{
public string folder { get; set; }
public Profile()
{
this.folder = "Profiles";
if (!File.Exists(folder))
{
Directory.CreateDirectory(folder);
File.Create(folder + "/default.cfg").Close();
}
}
public string[] getProfiles()
{
string[] files = Directory.GetFiles(folder);
return files;
}
public void saveProfile(string filename)
{
Form1 form = new Form1();
string cpuCount = "cpuCount=" + form.comboBox1.SelectedItem;
string RAM = "maxRAM=" + form.comboBox4.SelectedItem;
string VRAM = "maxVRAM=" + form.comboBox2.SelectedItem;
string threads = "cpuThreads=" + form.comboBox3.SelectedItem;
string path = folder + "/" + filename;
StreamWriter sw = new StreamWriter(path);
string[] lines = { cpuCount, RAM, VRAM, threads };
foreach (var item in lines)
{
sw.WriteLine(item);
}
sw.Close();
}
public string currentProfile()
{
Form1 form = new Form1();
string selected = form.comboBox5.SelectedValue + ".cfg".ToString();
return selected;
}
}
Thank you.

The problem is that there is nothing selected in your ComboBox. You create your form and then, without previous user interaction, you want to get the SelectedItem which is null at that moment.
When you create ComboBox control and fill it with items, SelectedItem property is null until you either programratically set it (by using for example comboBox1.SelectedIndex = 3) or by user interaction with the control. In this case you are not doing anything of the above and that is why you are geting the mentioned error.
EDIT Based on the edited question
Change your code like this:
first change the saveProfile method so you could pass the four strings which you write into the text file. Note that you could alternatively pass the reference of the form but I wouldn't suggest you that. So change the method like this:
public void saveProfile(string filename, string cpuCount, string RAM , string VRAM , string threads)
{
string path = folder + "/" + filename;
using(StreamWriter sw = new StreamWriter(path))
{
sw.WriteLine("cpuCount=" + cpuCount);
sw.WriteLine("maxRAM=" + RAM );
sw.WriteLine("maxVRAM=" + VRAM );
sw.WriteLine("cpuThreads=" + threads);
}
}
And then call it from button3 Click event handler like this:
private void button3_Click(object sender, EventArgs e)
{
string current = profile.currentProfile();
string cpuCount = this.comboBox1.SelectedItem.ToString();
string RAM = this.comboBox4.SelectedItem.ToString();
string VRAM = this.comboBox2.SelectedItem.ToString();
string threads = this.comboBox3.SelectedItem().ToString();
profile.saveProfile(current, cpuCount, RAM, VRAM, threads);
}
Or alternatively
private void button3_Click(object sender, EventArgs e)
{
string current = profile.currentProfile();
profile.saveProfile(current, this.comboBox1.SelectedItem.ToString(), this.comboBox4.SelectedItem.ToString(), this.comboBox2.SelectedItem.ToString(), this.comboBox3.SelectedItem().ToString());
}

From what I can see, you are calling form.comboBox1.SelectedItem.ToString() right after the creation of Form1. This means that the cpuCount variable is initialized right after the form is created, thus far before you have the chance to change the selected item with your mouse.
If you want to retrieve the value of the combobox after it is changed, you can use the SelectedIndexChanged event.

First of all, add a Form_Load Event and put your code in the handler. (use constructor for property initialization and other variable initialization)
private void Form1_Load(object sender, EventArgs e)
{
this.comboBox1.SelectedItem= 5; // This will set the combo box to index 5
string cpuCount = this.comboBox1.SelectedText; // This will get the text of the selected item
}
so you get the value of item at index 5 in cpuCount variable.
The selected clause gives you the values AFTER you have selected something, by default(when you run your app) there is nothing selected in the comoboBox, hence, it displays the value as null, after selecting the item you can use the combobox's selectedItem, selectedIndex, selectedText and selectedValue properties.
You can also use databinding to display items in the combobox, which in my view is a better way then adding the items manually.
to databind your combobox you can use,
// Bind your combobox to a datasource, datasource can be a from a database table, List, Dataset, etc..
IDictionary<int, string> comboDictionary = new Dictionary<int, string>();
comboDictionary.Add(1, "first");
comboDictionary.Add(2, "second");
comboDictionary.Add(3, "third");
comboBox1.DataSource = comboDictionary;
comboBox1.DisplayMember = "Key";
comboBox1.ValueMember = "Value";
//
And here now you can use combobox1.SelectedIndex to go through the item collection in the datasource :) and it will give you the value against your keys when you use combobox1.SelectedValue. Hope this helps.

Your ComoboBox doesn't have items in it. So it will not return properly. You are accessing combobox selected value rights after making form object.
And if it comboBox has items then nothing is being selected. By default nothing is selected in comboBox. You need to set it. Use this. What it returns? Set comboBox.SelectedIndex and then get selectedItem.
int selectedIndex = form.comboBox1.SelectedIndex;
Try this. Add some items in ComboBox and then get selectedItem.
Form1 form = new Form1();
form.comboBox1.Add("Item 1");
form.comboBox1.Add("Item 2");
form.comboBox1.Add("Item 3");
form.comboBox1.SelectedIndex = 1;
string cpuCount = form.comboBox1.SelectedItem.ToString();

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.