在 C# 中找到指定序列的第一个元素的索引
原文:https://www . geeksforgeeks . org/find-c-sharp 中指定序列的第一个元素的索引/
在 C# 8.0 中引入了索引结构。它表示可用于索引集合或序列的类型，并且可以从开始或结束开始。您可以在索引结构提供的开始属性的帮助下找到指向指定集合或序列的第一个元素的索引。
语法:
public static property Index Start { Index get(); };
例 1:
// C# program to illustrate the
// concept of the start index
using System;
namespace example {
class GFG {
// Main Method
static void Main(string[] args)
{
// Creating new indexes
// Using Index() constructor
var in1 = new Index(1, true);
var in2 = new Index(3, false);
// Get the start index
var res1 = Index.Start;
// Displaying the index
Console.WriteLine("Index: {0}", in1);
Console.WriteLine("Index: {0}", in2);
Console.WriteLine("Start Index: {0}", res1);
}
}
}
输出:
Index: ^1
Index: 3
Start Index: 0
例 2:
// C# program to illustrate the
// concept of the start index
using System;
namespace example {
class GFG {
// Main Method
static void Main(string[] args)
{
// Creating and initializing an array
string[] greetings = new string[] {"Hello", "Hola", "Namaste",
"Bonjour", "Ohayo", "Ahnyounghaseyo"};
// Get the end index
var res = Index.Start;
// Checking the given index
// is the start index or not
if (res.Equals(0) == true) {
Console.WriteLine("The given index is start index"+
" and the element is " + greetings[res]);
}
else {
Console.WriteLine("The given index is not the start index ");
}
}
}
}
输出:
The given index is start index and the element is Hello
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