如何在C#中查找StringBuilder的容量？示例

StringBuilder.Capacity属性用于获取或设置当前实例分配的内存中可以包含的最大字符数。

语法：public int Capacity {get;set; }
返回值：该属性将返回当前实例分配的内存中可以包含的最大字符数。其值的范围可以从”长度”到”最大容量”。
异常：如果为set操作指定的值小于此实例的当前长度, 或者为set操作指定的值大于最大容量, 则此属性将提供ArgumentOutOfRangeException。

下面的程序将说明上述属性的用法：

示例1：

//C# program to demonstrate
//the Capacity() Property
using System;
using System.Text;
  
class GFG {
  
     //Main Method
     public static void Main(String[] args)
     {
  
         //create a StringBuilder object, //default capacity will be 16
         StringBuilder str = new StringBuilder();
  
         //get default capacity
         int cap = str.Capacity;
  
         Console.WriteLine( "Deafult Capacity of StringBuilder = "
                                                          + cap);
  
         //add the String to StringBuilder Object
         str.Append( "Geek" );
  
         //get capacity
         cap = str.Capacity;
  
         //print the result
         Console.WriteLine( "StringBuilder = " + str);
         Console.WriteLine( "Current Capacity of StringBuilder = "
                                                          + cap);
     }
}

输出如下：

Deafult Capacity of StringBuilder = 16
StringBuilder = Geek
Current Capacity of StringBuilder = 16

示例2：

//C# program to demonstrate
//the Capacity() Property
using System;
using System.Text;
  
class GFG {
     public static void Main(String[] args)
     {
  
         //create a StringBuilder object
         //with a String passed as parameter
         StringBuilder str = 
            new StringBuilder( "WelcomeGeeks" );
  
         //get capacity
         int capacity = str.Capacity;
  
         //print the result
         Console.WriteLine( "StringBuilder = " + str);
         Console.WriteLine( "Capacity of StringBuilder = "
                                             + capacity);
     }
}

输出如下：

StringBuilder = WelcomeGeeks
Capacity of StringBuilder = 16

参考：

• https://docs.microsoft.com/en-us/dotnet/api/system.text.stringbuilder.capacity?view=netframework-4.7.2