find index of an int in a list

Is there a way to get the index of an int from a list? Looking for something like list1.FindIndex(5) where I want to find 开发者_运维知识库the position of 5 in the list.

Use the .IndexOf() method of the list. Specs for the method can be found on MSDN.

FindIndex seems to be what you're looking for:

FindIndex(Predicate<T>)

Usage:

list1.FindIndex(x => x==5);

Example:

// given list1 {3, 4, 6, 5, 7, 8}
list1.FindIndex(x => x==5);  // should return 3, as list1[3] == 5;

List<string> accountList = new List<string> {"123872", "987653" , "7625019", "028401"};

int i = accountList.FindIndex(x => x.StartsWith("762"));
//This will give you index of 7625019 in list that is 2. value of i will become 2.
//delegate(string ac)
//{
//    return ac.StartsWith(a.AccountNumber);
//}
//);

Try IndexOf.

It's even easier if you consider that the Generic List in C# is indexed from 0 like an array. This means you can just use something like:

int index = 0; int i = accounts[index];