从列表中选择特定项目 <generic> 通过其变量之一

Question

I have a List<> Generic .The generic class has variables inside such as variable1 , variable2 , variable3 ....

I want to create a new instance of a generic class with values coming from a specific item in this list where generic's variable3 = some value

Thanks :)

Answer 1

GenericClass item = yourList.FirstOrDefault(r=> r.variable3 == "somevalues");

If you only need to select a single item which met the criteria, then you can use,

• First() Returns the first item in the list, or throw an exception if none found
• FirstOrDefault() Returns the first item in the list or default value
• Single() Returns the only item in the list, if more than a single item met the criteria or none met the criteria then an exception would be thrown
• SingleOrDefault() Returns the only item in the list, if more than a single item met the criteria then an exception would be thrown, if none is found, default value is returned
• Last() Returns the last item in the list, or throw an exception of none found
• LastOrDefault() Returns the last item in the list or default value