c# - Lambda expression to return one result for each distinct value in list -

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i have large list of class object , using following lambda function return elements meet condition. 

var call = calllist.where(i => i.applicationid == 001).tolist();

this return list of objects have id of 001.

i curious different applicationids there are. lambda function list , return list element have different applicationid fetches 1 of those.

if understand question can try:

var list = calllist.groupby(x => x.applicationid).select(x => x.first()).tolist();

so if have list like:

appid:1, appid:1, appid:2, appid:2, appid:3, appid:3

will return:

appid:1 appid:2 appid:3

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