There are many questions that ask the opposite of this question, unfortunately none of them have worked for me. I have the following code to achieve my purpose:
foreach (var item in listBox1.Items)
{
checkedListBox1.Items.Add(item);
}
The problem is that when I do this, I don't get the values inside the ListBox, rather the System.Data.DataRowView items. So my CheckedListBox gets populated with exactly this, System.Data.DataRowView strings, which are all the same and don't show the actual string value.
Edit: I bind to the ListView this way: I have a DataTable ds, and:
listBox1.DataSource = ds;
For some unknown reason, DataSource, DisplayMember and ValueMember properties are hidden for CheckedListBox control.
If you want to copy the the list box items text, the correct way is to use ListControl.GetItemText method like this
foreach (var item in listBox1.Items)
checkedListBox1.Items.Add(listBox1.GetItemText(item));
But this way it will be hard to find which source object is checked (for instance when enumerating CheckedItems). A better way would be to define your own class like this
class MyListItem
{
public object Value;
public string Text;
public override string ToString() { return Text; }
}
and use
foreach (var item in listBox1.Items)
checkedListBox1.Items.Add(new MyListItem { Value = item, Text = listBox1.GetItemText(item) });
Try this:
foreach (var dataRowView in listBox1.Items.OfType<DataRowView>())
{
checkedListBox1.Items.Add(dataRowView[0].ToString());
}
The text displayed by derived ListControl classes like a CheckedListBox, when these controls are binded to a datasource, is ruled by the property DisplayMember. This property equals to a string representing the name of a property (or a columnname) in the datasource.
So before adding the new items to your checkedlistbox I suggest to write
checkedListBox1.DataSource = listBox1.DataSource
checkedListBox1.DisplayMember = listBox1.DisplayMember
checkedListBox1.ValueMember = listBox1.ValueMember
And no need to create a loop reading all the items from the source listbox, just use the same datasource and your are ready
You need to do a cast like the following :
foreach (var item in listBox1.Items)
{
checkedListBox1.Items.Add((ListItem)item);
}
or else you can use like this:
foreach (ListItem item in listBox1.Items)
{
checkedListBox1.Items.Add(item);
}
even this also may help you(use like this if you want text and value);
for(int i=0;i<listBox1.Items.Count-1;i++)
{
checkedListBox1.Items.Add(new ListItem() { Text = listBox1.Items[i].Text, Value = listBox1.Items[i].Text });
}
Related
I'm Trying to fetch items from checked listbox when the user checks the listbox item it should be displayed in a label on a button click. I tried using this:
foreach (object item in checkedlistbox1.CheckedItems)
{
labelto.Text += checkedlistbox1.SelectedItem.ToString();
}
But I'm getting this exception:
List that this enumerator is bound to has been found, enumerator can only be used if the list does not change.
How to print the checked items from the checked listbox to a label?
This is not a complicated task, why don't you make try with the following:
string displayText = "";
foreach(object item in checkedListBox1.CheckedItems)
{
DataRowView castedItem = item as DataRowView;
displayText += castedItem["boundPropertyNameHere"];
}
labelto.Text = displayText;
Please note:
Where boundPropertyNameHere be the name of property that used to bind the collection.
I am trying to get the value of the selected item in the listbox using the code below, but it is always returning null string.
DataSet ds = searchforPrice(Convert.ToString(listBox1.SelectedItem));
Here I am trying to pass the value of selected item as string to method searchforPrice to retrive dataset from the database.
How can i retrive the value of selected item as string?
I am adding items to listbox from combo box which in turn loads the items from the database.
listBox1.Items.Add(comboBox2.Text);
Anybody has answer for this..
If you want to retrieve the display text of the item, use the GetItemText method:
string text = listBox1.GetItemText(listBox1.SelectedItem);
If you are using ListBox in your application and you want to return the selected value of ListBox and display it in a Label or any thing else then use this code, it will help you
private void listBox1_SelectedIndexChanged(object sender, EventArgs e)
{
label1.Text = listBox1.SelectedItem.ToString();
}
To retreive the value of all selected item in à listbox you can cast selected item in DataRowView and then select column where your data is:
foreach(object element in listbox.SelectedItems) {
DataRowView row = (DataRowView)element;
MessageBox.Show(row[0]);
}
string textValue = ((ListBoxItem)listBox1.SelectedItem).Content.ToString();
If you want to retrieve your value from an list box
you should try this:
String itemSelected = numberListBox.GetItemText(numberListBox.SelectedItem);
Get FullName in ListBox of files (full path) list (Thomas Levesque answer modificaton, thanks Thomas):
...
string tmpStr = "";
foreach (var item in listBoxFiles.SelectedItems)
{
tmpStr += listBoxFiles.GetItemText(item) + "\n";
}
MessageBox.Show(tmpStr);
...
You can Use This One To get the selected ListItme Name ::
String selectedItem = ((ListBoxItem)ListBox.SelectedItem).Name.ToString();
Make sure that Your each ListBoxItem have a Name property
Elaborating on previous answer by Pir Fahim, he's right but i'm using selectedItem.Text (only way to make it work to me)
Use the SelectedIndexChanged() event to store the data somewhere.
In my case, i usually fill a custom class, something like:
class myItem {
string name {get; set;}
string price {get; set;}
string desc {get; set;}
}
private void listBox1_SelectedIndexChanged(object sender, EventArgs e)
{
myItem selected_item = new myItem();
selected_item.name = listBox1.SelectedItem.Text;
Retrieve (selected_item.name);
}
And then you can retrieve the rest of data from a List of "myItems"..
myItem Retrieve (string wanted_item) {
foreach (myItem item in my_items_list) {
if (item.name == wanted_item) {
// This is the selected item
return item;
}
}
return null;
}
set properties listbox1 DisplayMember = "Text";
set properties listbox1 ValueMember = "Value";
Event
private void listbox1_SelectedIndexChanged(object sender, EventArgs e)
{
string selectedValue = listbox1.SelectedValue.ToString();
}
The correct solution seems to be:
string text = ((ListBoxItem)ListBox1.SelectedItem).Content.ToString();
Please be sure to use .Content and not .Name.
If you want to retrieve the item selected from listbox, here is the code...
String SelectedItem = listBox1.SelectedItem.Value;
I have a listbox on a form set to allow multiple selections. I want to loop through each selected item, store the selected value in a variable and do some work. I've tried many different variations of code to do this, but so far nothing has worked. Any help would be greatly appreciated! My code is below:
foreach (var item in systemList.Items)
{
string systemName = systemList.SelectedItems.ToString();
//do some work//
}
You can get all SelectedItems using below code:
var items = systemList.Items.Cast<ListItem>().Where(item => item.Selected);
You can then loop through the items
foreach (var item in items)
{
//Access value of each item by calling item.Value
}
foreach (var item in systemList.SelectedItems)
{
string systemName = item.ToString();
//do some work//
}
make sure listbox Selection mode is set to other than single!
I am trying to get the value of the selected item in the listbox using the code below, but it is always returning null string.
DataSet ds = searchforPrice(Convert.ToString(listBox1.SelectedItem));
Here I am trying to pass the value of selected item as string to method searchforPrice to retrive dataset from the database.
How can i retrive the value of selected item as string?
I am adding items to listbox from combo box which in turn loads the items from the database.
listBox1.Items.Add(comboBox2.Text);
Anybody has answer for this..
If you want to retrieve the display text of the item, use the GetItemText method:
string text = listBox1.GetItemText(listBox1.SelectedItem);
If you are using ListBox in your application and you want to return the selected value of ListBox and display it in a Label or any thing else then use this code, it will help you
private void listBox1_SelectedIndexChanged(object sender, EventArgs e)
{
label1.Text = listBox1.SelectedItem.ToString();
}
To retreive the value of all selected item in à listbox you can cast selected item in DataRowView and then select column where your data is:
foreach(object element in listbox.SelectedItems) {
DataRowView row = (DataRowView)element;
MessageBox.Show(row[0]);
}
string textValue = ((ListBoxItem)listBox1.SelectedItem).Content.ToString();
If you want to retrieve your value from an list box
you should try this:
String itemSelected = numberListBox.GetItemText(numberListBox.SelectedItem);
Get FullName in ListBox of files (full path) list (Thomas Levesque answer modificaton, thanks Thomas):
...
string tmpStr = "";
foreach (var item in listBoxFiles.SelectedItems)
{
tmpStr += listBoxFiles.GetItemText(item) + "\n";
}
MessageBox.Show(tmpStr);
...
You can Use This One To get the selected ListItme Name ::
String selectedItem = ((ListBoxItem)ListBox.SelectedItem).Name.ToString();
Make sure that Your each ListBoxItem have a Name property
Elaborating on previous answer by Pir Fahim, he's right but i'm using selectedItem.Text (only way to make it work to me)
Use the SelectedIndexChanged() event to store the data somewhere.
In my case, i usually fill a custom class, something like:
class myItem {
string name {get; set;}
string price {get; set;}
string desc {get; set;}
}
private void listBox1_SelectedIndexChanged(object sender, EventArgs e)
{
myItem selected_item = new myItem();
selected_item.name = listBox1.SelectedItem.Text;
Retrieve (selected_item.name);
}
And then you can retrieve the rest of data from a List of "myItems"..
myItem Retrieve (string wanted_item) {
foreach (myItem item in my_items_list) {
if (item.name == wanted_item) {
// This is the selected item
return item;
}
}
return null;
}
set properties listbox1 DisplayMember = "Text";
set properties listbox1 ValueMember = "Value";
Event
private void listbox1_SelectedIndexChanged(object sender, EventArgs e)
{
string selectedValue = listbox1.SelectedValue.ToString();
}
The correct solution seems to be:
string text = ((ListBoxItem)ListBox1.SelectedItem).Content.ToString();
Please be sure to use .Content and not .Name.
If you want to retrieve the item selected from listbox, here is the code...
String SelectedItem = listBox1.SelectedItem.Value;
Hi i'm trying to use the tag item of a listbox.
heres my code.
int number = 0;
foreach (ListViewItem item in listBox1.Items)
{
Tag tag = (Tag) item.Tag;
saveSlide(showid, tag.photoid, enumber);
number++;
}
problem im havin is when i run the program i get an error message sayin cannot convert type string to system.ListView but i haven't declared item as a string anywher in my program
This is where i add the items to the listbox. Please help. Im on a dead line and have sooo much more to do
private void buttonAdd_Click(object sender, EventArgs e)
{
//add selected item into listBox
DataRowView drv = (DataRowView)listBox1.SelectedItem;
Tag tag = new Tag();
string title = drv["title"].ToString();
ListViewItem item = new ListViewItem(title);
item.Tag = tag;
tag.photoid = (int)drv["photoid"];
listBox1.Items.Add(title);
}
Poppy you are adding title to listBox1.Items.
title is of type string.
So when you access it use string type like this foreach (string item in listBox1.Items).
Try. Does it help?
int number = 0;
foreach (string item in listBox1.Items)
{
Tag tag = (Tag) item.Tag;
saveSlide(showid, tag.photoid, enumber);
number++;
}
This works, you need to show the code where you add items to the list:
private class Tag
{
public override string ToString()
{
return "Tag";
}
}
ListBox listBox = new ListBox();
listBox.Items.Add(new ListViewItem { Tag = new Tag() });
foreach (ListViewItem item in listBox.Items)
{
Tag tag = (Tag)item.Tag;
Console.WriteLine(tag);
}
Edit following more code:
You are adding strings to your ListBox instead of the ListViewItem:
listBox1.Items.Add(title); should be listBox1.Items.Add(item);
ListBox.Items is an ObjectCollection. That means you can choose the kind of object to put in it.
When you're doing this:
string title = drv["title"].ToString();
listBox1.Items.Add(title);
you are putting string objects into it, so you would need to get them out like this:
foreach (string item in listBox1.Items)
Instead, you probably want your code to be more like this:
ListViewItem item = new ListViewItem(title);
item.Tag = tag;
tag.photoid = (int)drv["photoid"];
listBox1.Items.Add(item); // The difference is here - add *item* not *title*
then you'll be able to use this the way you initially wrote it:
foreach (ListViewItem item in listBox1.Items)
Does Tag has a member named photoid? Maybe you need a cast in there to convert your 'tag' to whatever it's supposed to be?
//Tag tag = (Tag) item.Tag;
MyObject tag = (MyObject)item.Tag;
saveSlide(showid, tag.photoid, enumber);
number++;
Unless you named things weird I'd say the error is that you're trying to get a ListViewItem from a ListBox.
Just change the last line of code of the second code-snippet and everything will be ok, which is as follows.
listBox1.Items.Add(item);
About the Error
You added strings to the listBox as items and in the foreach an item(which is a string) is tried to convert(caste) to ListViewItem implicitly to hich doesn't work and the compiler gives the error.
Hope it will work.