在C＃中查找指定范围的起始索引

范围结构在C＃8.0中引入。它表示具有开始索引和结束索引的范围。您可以在Range结构提供的Start Property的帮助下找到给定范围的起始索引。

句法：

public property Index Start { Index get(); };

此处，索引表示范围的包含起始索引。

范例1：

// C# program to illustrate the use
// of Start property of Range struct
using System;
  
namespace range_example {
  
class GFG {
  
    // Main Method
    static void Main(string[] args)
    {
  
        // Creating range
        // using Range Constructor
        var r1 = new Range(0, 5);
  
        // Creating range
        // using range operator
        Range r2 = 3..7;
  
        // Finding the Starting 
        // index of r1 and r2 ranges
        // Using Start property
        var res1 = r1.Start;
        Console.WriteLine("Staring index of r1 range: " + res1);
  
        var res2 = r2.Start;
        Console.WriteLine("Starting index of r2 range: " + res2);
    }
}
}

输出：

Staring index of r1 range: 0
Starting index of r2 range: 3

范例2：

// C# program to illustrate how to use
// Start property of Range structure
using System;
  
namespace range_example {
  
class GFG {
  
    // Main Method
    static void Main(string[] args)
    {
        // Creating and initailizing an array
        string[] arr = new string[8] {"Archery", "Badminton", "Cricket", "Bowling",
                                   "Boxing", "Curling", "Tennis", "Skateboarding"};
  
        // Creating ranges
        // Using Range(Index, Index)
        // Constructor
        var r1 = new Range(0, 3);
        var r2 = new Range(4, 7);
  
        // Finding the start index 
        // of the specified range
        // Using Start property
        var res1 = r1.Start;
        var res2 = r2.Start;
        Console.WriteLine("Start Index of Range {0} is {1}"+
               " and the item is {2}", r1, res1, arr[res1]);
  
        Console.WriteLine("Start Index of Range {0} is {1}"+
               " and the item is {2}", r2, res2, arr[res2]);
    }
}
}

输出：

Start Index of Range 0..3 is 0 and the item is Archery
Start Index of Range 4..7 is 4 and the item is Boxing