I m confused about How can i Find a Specified Text In a A List using Lambda Expressions For Example i have a List
List<string> MyList = new List<string> {"TEXT","NOTEXT","test","notest"};
as you can see The List is Filtred By "ToUpper" and "ToLower" Properties i want for example to shearch on ToLower elemtes in this list using Lambda Expression
var SList = MyList.FindAll(item => item.ToLower);
foreach(var s in SList)
{
Console.WriteLine(s);
}
Just check if the lowercase value matches against the current value, same for upper
var lower = MyList.Where(a=>a == a.ToLowerInvariant());
var upper = MyList.Where(a=>a == a.ToUpperInvariant());
If you want to use the culture specific version to check then just use the culture-specific methods
var lower = MyList.Where(a=>a == a.ToLower());
var upper = MyList.Where(a=>a == a.ToUpper());
ToLower is not a property but a method and it does not make a test (i.e it does not return a bool) but returns a converted string.
This means, that since it is a method, you must place parentheses after it (.ToLower()).
In order to make a test you must compare the result with something. In this case with the original string, in order to see whether it is equal to the lower case string.
var SList = MyList.FindAll(item => item == item.ToLower());
The exact working of ToLower depends on the current UI-culture. Some languages have special rules for conversion to lower or upper case. If you prefer to have a culture independent behavior, use ToLowerInvariant or ToUpperInvariant instead.
