c# - Group IEnumerable into a string -

i wonder if spare me few minutes give me advice please?

i've created ienumerable list:

public class emailblock {     public int alertcategory { get; set; }     public string alertname { get; set; }     public string alerturl { get; set; }     public string alertsnippet { get; set; } //need work out snippet }  list<emailblock> myemaildata = new list<emailblock>(); 

which loop through data (umbraco content - not that's relevant!) , add items list.

 myemaildata.add(new emailblock { alertcategory = category.id, alertname = alert.getpropertyvalue("pagetitle"), alerturl = alert.niceurl }); 

what i'd group list alertcategory , load each 'group' (another loop occurs later check members have subscribed alert category) variable can use email's content.

linq has nice group statement:

var emailgroup = emaillist.groupby(e => e.alertcategory); 

then can loop through each grouping , whatever want:

foreach(var grouping in emailgroup) {   //do whatever want here.    //note grouping access list of grouped items, grouping.key show grouped field } 

edit:

to retrieve group after have grouped them, use where more 1 or first one:

var group = emailgroup.first(g => g.key == "name looking for"); 

or

var groups = emailgroup.where(g => listofwantedkeys.contains(g.key)); 

this lot more efficient looping through every time need find something.