C# | CharEnumerator.Dispose() 方法

此方法用于释放 CharEnumerator 类的当前实例使用的所有资源。 Dispose()方法使CharEnumerator处于不可用状态。因此，当用户完成对CharEnumerator的工作时，应该调用此方法。

句法：

public void Dispose ();

返回值：此方法不返回任何内容。

下面是说明CharEnumerator.Dispose()方法使用的程序：

示例 1：

// C# program to illustrate the
// use of CharEnumerator.Dispose()
// Method
using System;
  
class GFG {
  
    // Driver code
    public static void Main()
    {
        // Initialize a string object
        string str = "GeeksforGeeks is Awesome!";
  
        // Instantiate a CharEnumerator object
        CharEnumerator chEnum = str.GetEnumerator();
  
        // Print the string using CharEnumerator
        while (chEnum.MoveNext())
            Console.Write(chEnum.Current);
  
        // CharEnumerator object is disposed
        chEnum.Dispose();
  
        // Try printing current character
        // using CharEnumerator
        try
        {
  
            Console.Write(chEnum.Current);
        }
  
        catch (Exception e) 
        {
            Console.Write("\nShows " + e.GetType() + " as"+
                 " the CharEnumerator object is disposed.");
        }
    }
}

输出：

GeeksforGeeks is Awesome!
Shows System.NullReferenceException as the CharEnumerator object is disposed.

示例 2：

// C# program to illustrate the
// use of CharEnumerator.Dispose()
// Method
using System;
  
class GFG {
  
    // Driver code
    public static void Main()
    {
        // Initialize a string object
        string str = "GeeksforGeeks is Awesome";
  
        // Instantiate a CharEnumerator object
        CharEnumerator chEnum = str.GetEnumerator();
  
        while (chEnum.MoveNext()) 
        {
            // Print current character
            Console.Write(chEnum.Current);
  
            // Dispose the CharEnumerator object
            // when space is encountered
            if (chEnum.Current == ' ')
            {
                Console.WriteLine(".\nDispose CharEnumerator object and "+
                                        "try to print current character.");
                chEnum.Dispose();
                break;
            }
        }
   
        // Try printing current character
        // using CharEnumerator
        try
        {
            Console.Write(chEnum.Current);
        }
          
        catch (Exception e) 
        {
            Console.Write("Shows " + e.GetType() + " as the"+
                      " CharEnumerator object is disposed.");
        }
    }
}

输出：

GeeksforGeeks .
Dispose CharEnumerator object and try to print current character.
Shows System.NullReferenceException as the CharEnumerator object is disposed.

参考：

• https://docs.microsoft.com/en-us/dotnet/api/system.charenumerator.dispose?view=netframework-4.7.2