.net - Creating a List of Lists in C# - Stack Overflow
2015年2月25日 · I seem to be having some trouble wrapping my head around the idea of a Generic List of Generic Lists in C#. I think the problem stems form the use of the <T> …
Most efficient way to find if a value exists within a C# List
2013年4月17日 · To call the LINQ Contains, either use list.AsEnumerable().Contains(true) (where the AsEnumerable ensures that the instance methods of List<> itself do not apply) or use …
c# - ToList() - does it create a new list? - Stack Overflow
2010年5月5日 · Yes, ToList will create a new list, but because in this case MyObject is a reference type then the new list will contain references to the same objects as the original list. …
Where clause in Linq in List c# - Stack Overflow
var list=testList.Where(f=>f.Family=="").Select(n=>n.Name); In Linq you need to apply the filter before projecting (unless the filter applies to the results of the projection rather than the …
How can I loop through a List<T> and grab each item?
2013年9月18日 · Another word of warning, if you have a big list, (by big I mean over 100,000 items) myMoney.Count start to take a while as it has to traverse the list to perform the Count, …
c# - Difference between list.First(), list.ElementAt(0) and list[0 ...
2011年5月29日 · .ElementAt(0) will throw an exception if the index is greater than or equal to the number of elements in the list. To avoid this, use ElementAtOrDefault(0) . If you're using LINQ …
c# - How can I find the last element in a List<>? - Stack Overflow
@chillitom after reading the source of System.Linq.Enumerable.Last, I agree with 0b101010 - the Last() code ain't "optimized for List<>s" - Last() is just an ugly wrapper, which defaults to return …
c# - Getting a list item by index - Stack Overflow
2014年10月3日 · Visual Basic, C#, and C++ all have syntax for accessing the Item property without using its name. Instead, the variable containing the List is used as if it were an array: …
c# - Creating a comma separated list from IList<string> or …
What is the cleanest way to create a comma-separated list of string values from an IList<string> or IEnumerable<string>?
c# - How to tell whether a Type is a list or array or IEnumerable or ...
C# get if a property is any sort of list. 0. Determine with reflection if a class property is an object ...