How to remove duplicates from a list in C#

问题

I want to remove duplicates from this list:

List<Dictionary<string, object>> val = new List<Dictionary<string, object>>();

It does not work if I apply Distinct() in this way:

 List<Dictionary<string, object>> result = val.Distinct().ToList<Dictionary<string, object>>()

Update: Problem is now solved. I used the MySQL union command to read table from the database.

回答1:

Try this:

List<Dictionary<string, object>> result = val.Distinct(new myDictionaryComparer()).ToList();

where myDictionaryComparer is a Comparer Class. You can implement your comparison logic in this class.

回答2:

You can use the following method:

val.Distinct()

来源：https://stackoverflow.com/questions/2756458/how-to-remove-duplicates-from-a-list-in-c-sharp