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How to sort a webcontrols Listbox?
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.
Who is Participating?
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.
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.
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
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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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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;
}