I love C#, but miss the simplicity of PHP sometimes. Specifically when dealing with collections. Recently I ran into a situation where PHP’s implode would have been perfect, but I wasn’t able to find any quick and easy built in solution.
I would like to be able to do this
string id_list = implode( ",", mySortedList.Keys );
I’m not aware of any built in ways to do this, so I wrote the following helper function.
///
/// Pass in a SortedList and this will return a string containing a delimited
/// list of keys separated by delim
///
///
///
/// key1{DELIM}key2{DELIM}keyN
public static string SortedListKeysToDelimList(SortedList sl, string delim)
{
StringBuilder sb_keys = new StringBuilder();
foreach (DictionaryEntry dl in sl)
{
sb_keys.Append( dl.Key.ToString() );
// append DELIM only if we're NOT on the last entry
if (dl.Key != sl.GetKey(sl.Keys.Count - 1))
{
sb_keys.Append( delim );
}
}
return sb_keys.ToString();
}
If there is any better way to do this, please leave me a comment.
How’s about different?
SortedList sl = new SortedList();
sl.Add(1, “hi”);
sl.Add(2, “there”);
sl.Add(3, “everyone”);
IList il = sl.GetKeyList();
string str = string.Empty;
for (int i = 0; i < il.Count; i++)
{
str += i == 0 ? il[i].ToString() : string.Format(“,{0}”, il[i].ToString());
}
Not a bad idea, but I’d still say use a StringBuilder since you might not know the size of your incoming SortedList.
Last one, promise!
How about this in SortedListKeysToDelimList?
string[] sa = new string[sl.Keys.Count];
sl.Keys.CopyTo(sa, 0);
return string.Join(delim, sa);
That one is great for a SortedList with keys that are strings. You’d have to manage casting if you have a SortedList with anything but string keys.
Thanks Pete!