.net – Sort TreeView Automatically Upon Adding Nodes

netsortingtreeviewwinforms

Is there an easy way to add nodes to a WinForms .NET TreeView control where the new nodes being added are inserted at the correct index so the entire list of nodes is sorted alphabetically? Pretty much having the same result as TreeView.Sort().

I have a TreeView that continually grows to a couple hundred nodes. The user can view this TreeView in real time as it grows. I'd prefer to just insert the nodes at the correct index, rather than calling TreeView.Sort() each time after a node is added.

Can this be done?

Best Answer

In winforms, you can simply set the TreeView's .Sorted property to True.

When Sorted is set to true, the TreeNode objects are sorted in alphabetical order by their Text property values. You should always use BeginUpdate and EndUpdate to maintain performance when adding a large quantity of items to a sorted TreeView. When the text of an existing node is changed, you must call Sort to resort the items.

Ref MSDN

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C# – How to sort a dictionary by value

Use LINQ:

Dictionary<string, int> myDict = new Dictionary<string, int>();
myDict.Add("one", 1);
myDict.Add("four", 4);
myDict.Add("two", 2);
myDict.Add("three", 3);

var sortedDict = from entry in myDict orderby entry.Value ascending select entry;

This would also allow for great flexibility in that you can select the top 10, 20 10%, etc. Or if you are using your word frequency index for type-ahead, you could also include StartsWith clause as well.

Python – How to sort a list of dictionaries by a value of the dictionary

The sorted() function takes a key= parameter

newlist = sorted(list_to_be_sorted, key=lambda d: d['name'])

Alternatively, you can use operator.itemgetter instead of defining the function yourself

from operator import itemgetter
newlist = sorted(list_to_be_sorted, key=itemgetter('name'))

For completeness, add reverse=True to sort in descending order

newlist = sorted(list_to_be_sorted, key=itemgetter('name'), reverse=True)

Best Answer

Related Solutions

C# – How to sort a dictionary by value

Python – How to sort a list of dictionaries by a value of the dictionary

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