http://geekdaxue.co/read/poetdp@kf/yzezl9 Webvar index = List.FindIndex(s => s.Number == box.Text); List[index] = new String; 但是，如何将其应用于 列表，例如？ var tuple=List.Find（s=>s.Item1==box.Text）； var tuple = List.Find(s => s.Item1 == box.Text); //assuming you're searching for the first string, but you can change the predicate anyway.

Check if an Array Contains a Value in C# Delft Stack

WebThe startIndex parameter can range from 0 to the length of the string instance. This method performs a word (case-sensitive and culture-sensitive) search using the current culture. The search begins at startIndex and continues to startIndex + count -1. The character at startIndex + count is not included in the search. WebArray - FindIndex. A T[] extension method that searches for the first index. solution architect tasks

List .FindIndex Method (System.Collections.Generic)

WebReturn value of FindIndex: FindIndex returns the index of the element if it is found. Else it returns -1. Exception by FindIndex: It throws ArgumentNullException if any of the argument is null. If the array is null … WebJun 8, 2024 · Code4IT - a blog for dotnet developers. As you can see, actually using LINQ is slower than using a simple index.While in .NET Core 3 the results were quite similar, with .NET 5 there was a huge improvement both cases, but now using a simple index is two times faster than using LINQ. WebMar 22, 2011 · ONE THING (READ in forum rules): if you got an answer on your question, you mark the wanted post as answered (like you apparently did). Case closed! solution architect skills set