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How to sort a webcontrols Listbox?
Posted on 2002-07-08
Hello,
I would like to know the simplest way to alphabetically sort the Listitems in a Webcontrols listbox? I am using C#.
Thanks for your help.
I would like to know the simplest way to alphabetically sort the Listitems in a Webcontrols listbox? I am using C#.
Thanks for your help.
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9 Comments
simplest solution will be to store the list item values in an array. Sort that array alphabatecally and then bind your list to that array.
Here is a proto type code.. You should be able to extend it to your needs..
private void Page_Load(object sender, System.EventArgs e)
{
wndListBox.Attributes.Add(
if (!IsPostBack)
{
wndListBox.DataSource = this.CreateTestStringArray
wndListBox.DataBind();
}
}
private ArrayList CreateTestStringArray()
{
ArrayList myValues = new ArrayList();
myValues.Add("Naveen");
myValues.Add("Foo");
myValues.Add("Bar");
myValues.Add("Quax");
myValues.Sort();
return myValues;
}
private void Page_Load(object sender, System.EventArgs e)
{
wndListBox.Attributes.Add(
if (!IsPostBack)
{
wndListBox.DataSource = this.CreateTestStringArray
wndListBox.DataBind();
}
}
private ArrayList CreateTestStringArray()
{
ArrayList myValues = new ArrayList();
myValues.Add("Naveen");
myValues.Add("Foo");
myValues.Add("Bar");
myValues.Add("Quax");
myValues.Sort();
return myValues;
}
thanks for your response. I did that for my Dropdownlist but was looking for another solution if possible.
If my data type is a ListItem in the Array, can i use the sort() method? It threw an exception for me.
It works fine if i store strings in the array and sort them. The reason i need ListItem is i have a text and a value for each.
If my data type is a ListItem in the Array, can i use the sort() method? It threw an exception for me.
It works fine if i store strings in the array and sort them. The reason i need ListItem is i have a text and a value for each.
thanks for your response. I did that for my Dropdownlist but was looking for another solution if possible.
If my data type is a ListItem in the Array, can i use the sort() method? It threw an exception for me.
It works fine if i store strings in the array and sort them. The reason i need ListItem is i have a text and a value for each.
If my data type is a ListItem in the Array, can i use the sort() method? It threw an exception for me.
It works fine if i store strings in the array and sort them. The reason i need ListItem is i have a text and a value for each.
In that case, you should construct your dropdown list dynamically. Meaning that on the page, you only have <asp:Dropdownlist> control and on Page_Load construct every ListItem object (pre-sorted) and then add each ListItem to it.
Naveen
Naveen
If it's coming straight from the DB, you can just use ORDER BY clause.
or manually do it:
Listbox.MoverBars = true
Listbox.Sorted = true
or manually do it:
Listbox.MoverBars = true
Listbox.Sorted = true
what do you mean by Listbox.Sorted?
I am using a webform listbox, i did not see anything about sorting.
I can sort easily for my dropdownlist since i can use an ArrayList to do the work and import the data later.
In the case for my listbox, it is more tricky because i have both a text and a value for each ListItem in the listbox.
I am using a webform listbox, i did not see anything about sorting.
I can sort easily for my dropdownlist since i can use an ArrayList to do the work and import the data later.
In the case for my listbox, it is more tricky because i have both a text and a value for each ListItem in the listbox.
You can compare the entries in an array for the listbox by calling the sort method on the array with a custom comparer object, like this:
myValues.Sort(new MyTextComparer())
If the class in your array is defined as:
class MyType
{
public string Text;
public string Value;
}
Then, the comparer class would look something like this:
class MyTextComparer: IComparer
{
public int Compare (object x, object y)
{
string tempObj1 = ((MyType)x).Text;
string tempObj2 = ((MyType)y).Text;
return tempObj1.CompareTo (tempObj2);
}
}
If you need more information on array sorting and this method in particular, check out http://samples.gotdotnet.com/QuickStart/howto/default.aspx?url=/quickstart/howto/doc/sort.aspx.
myValues.Sort(new MyTextComparer())
If the class in your array is defined as:
class MyType
{
public string Text;
public string Value;
}
Then, the comparer class would look something like this:
class MyTextComparer: IComparer
{
public int Compare (object x, object y)
{
string tempObj1 = ((MyType)x).Text;
string tempObj2 = ((MyType)y).Text;
return tempObj1.CompareTo (tempObj2);
}
}
If you need more information on array sorting and this method in particular, check out http://samples.gotdotnet.com/QuickStart/howto/default.aspx?url=/quickstart/howto/doc/sort.aspx.
Active 1 day ago
No comment has been added lately, so it's time to clean up this TA.
I will leave a recommendation in the Cleanup topic area that this question is:
Answered by naveenkohli
Please leave any comments here within the next seven days.
PLEASE DO NOT ACCEPT THIS COMMENT AS AN ANSWER!
TheLearnedOne
EE Cleanup Volunteer
I will leave a recommendation in the Cleanup topic area that this question is:
Answered by naveenkohli
Please leave any comments here within the next seven days.
PLEASE DO NOT ACCEPT THIS COMMENT AS AN ANSWER!
TheLearnedOne
EE Cleanup Volunteer
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