如何在 C# 中检查索引是从开始还是结束？
原文:https://www . geeksforgeeks . org/如何检查索引是从 c-sharp 中的开始还是结束/
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索引属性的帮助下，检查给定的索引是从给定集合或序列的开始还是结束。如果 IsFramend 属性返回 false，则表示索引从开始，或者如果 IsFramend 属性返回 true，则表示索引从结束。]
语法:
public property bool IsFromEnd { bool get(); };
例 1:
// C# program to illustrate the
// concept of the IsFromEnd property
using System;
namespace example {
class GFG {
// Main Method
static void Main(string[] args)
{
// Creating new indexes
// Using Index() constructor
var val1 = new Index(1, true);
var val2 = new Index(2, true);
var val3 = new Index(1, false);
var val4 = new Index(2, false);
// Checking if the specified
// index start from the end
// or not
var res1 = val1.IsFromEnd;
var res2 = val2.IsFromEnd;
var res3 = val3.IsFromEnd;
var res4 = val4.IsFromEnd;
// Display indexes and their values
Console.WriteLine("Index:{0} Start from end?: {1}", val1, res1);
Console.WriteLine("Index:{0} Start from end?: {1}", val2, res2);
Console.WriteLine("Index:{0} Start from end?: {1}", val3, res3);
Console.WriteLine("Index:{0} Start from end?: {1}", val4, res4);
}
}
}
输出:
Index:^1 Start from end?: True
Index:^2 Start from end?: True
Index:1 Start from end?: False
Index:2 Start from end?: False
例 2:
// C# program to illustrate the
// concept of the IsFromEnd property
using System;
namespace example {
class GFG {
// Main Method
static void Main(string[] args)
{
string[] greetings = new string[] {"Hello", "Hola", "Namaste",
"Bonjour", "Ohayo", "Ahnyounghaseyo"};
var val1 = new Index(1, true);
// Checking the given index
// is the end index or not
if (val1.IsFromEnd == true) {
Console.WriteLine("The given index is from end "+
"and the value is: " + greetings[val1]);
}
else {
Console.WriteLine("The given index is from start and"+
" the value is: " + greetings[val1]);
}
}
}
}
输出:
The given index is from end and the value is: Ahnyounghaseyo
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