Tag Archives: extension

Extension method to create CSV from List collection

Posted by on 2011/09/01 No comments

A quick one to share:

I needed to a method to quickly convert a List<string> to a plain comma delimited string. So I created this little Extension class:

public static class ListEx
{

public static string ToCSVString(this List<string> l)
{

StringBuilder sb = new StringBuilder();
if (l != null)
{

l.ForEach(li => sb.Append(li + “, “));

}
return sb.ToString().Trim(‘ ‘, ‘,’);

}

}

Of course this is still very specific to string collections only. I could have created something that does the same to say a List<T> list that is more generic but that I’ll leave for another day.

[Update]

While I’m at it – here is the opposite method:

public static List<string> ToListFromCSVString(this string s, bool ordered = false)
{

List<string> list = new List<string>();
if (s != null && s.Trim().Length > 0)
{

if (ordered)

list.AddRange((from sitem in s.Split(new char[] { ‘,’ }, StringSplitOptions.RemoveEmptyEntries)
orderby sitem
select sitem.Trim()).ToArray());

else

list.AddRange((from sitem in s.Split(new char[] { ‘,’ }, StringSplitOptions.RemoveEmptyEntries)
select sitem.Trim()).ToArray());

}

return list;

}

Extending the TreeView control

Posted by on 2011/08/22 No comments

Here is a little Extension class to the TreeView control. I created it to add some new functionality that is not available in the base control. It is based on the System.Windows.Forms namespace TreeView but probably can be use relatively easy without too much modification on WPF as well (haven’t tried it yet)

public static class TreeViewEx
    {
        public static int CheckedCount(this TreeView tvw)
        {
            int count = 0;
            count = (from TreeNode n in tvw.Nodes
                     where n.Checked
                     select n).Count();
            foreach (TreeNode childNode in tvw.Nodes)
            {
                count += CheckedCount(childNode);
            }

            return count;
        }
        public static int CheckedCount(this TreeNode parentNode)
        {
            int count = 0;
            count = (from TreeNode n in parentNode.Nodes
                     where n.Checked
                     select n).Count();
            foreach (TreeNode childNode in parentNode.Nodes)
            {
                count += CheckedCount(childNode);
            }
            return count;
        }
        public static List<TreeNode> CheckedNodes(this TreeView tvw)
        {
            List<TreeNode> checkedNodes = new List<TreeNode>();
            foreach(TreeNode node in (from TreeNode n in tvw.Nodes
                         select n))
            {
                if (node.Checked)
                    checkedNodes.Add(node);
                checkedNodes.AddRange(node.CheckedNodes().ToArray());
            }
            return checkedNodes;
        }
        public static List<TreeNode> CheckedNodes(this TreeNode parentNode)
        {
            List<TreeNode> checkedNodes = new List<TreeNode>();
            foreach (TreeNode node in (from TreeNode n in parentNode.Nodes
                                           select n))
            {
                if (node.Checked)
                    checkedNodes.Add(node);
                checkedNodes.AddRange(node.CheckedNodes().ToArray());
            }
            return checkedNodes;
        }
        public static void ExpandAllParents(this TreeNode node)
        {
            TreeNode parent = node.Parent;
            while (parent != null)
            {
                parent.Expand();
                parent = parent.Parent;
            }
        }
    }