C#中的StringBuilder.EnsureCapacity()方法
C#中的StringBuilder.EnsureCapacity()方法用于确保StringBuilder实例的容量至少为指定值。
语法
语法如下-
public int EnsureCapacity (int capacity);
以上，参数容量是要确保的最小容量。
示例
现在让我们看一个例子-
using System;
using System.Text;
public class Demo{
public static void Main(){
StringBuilder strBuilder = new StringBuilder("jhbjhb");
Console.WriteLine("String = "+strBuilder);
Console.WriteLine("StringBuilder capacity= "+strBuilder.Capacity);
strBuilder.EnsureCapacity(20);
Console.WriteLine("StringBuilder capacity= "+strBuilder.Capacity);
char[] arr = new char[5] {'a', 'b', 'c', 'd', 'e'};
strBuilder.CopyTo(1, arr, 1, 3);
Console.WriteLine("\nCopied String in char array...");
Console.WriteLine(arr);
}
}输出结果
这将产生以下输出-
String = jhbjhb StringBuilder capacity= 16 StringBuilder capacity= 20 Copied String in char array... ahbje
示例
现在让我们来看另一个示例-
using System;
using System.Text;
public class Demo{
public static void Main(){
StringBuilder strBuilder = new StringBuilder("Katie");
Console.WriteLine("String = "+strBuilder);
Console.WriteLine("\nStringBuilder capacity = "+strBuilder.Capacity);
Console.WriteLine("StringBuilder length = "+strBuilder.Length);
strBuilder.EnsureCapacity(35);
Console.WriteLine("\nStringBuilder capacity= "+strBuilder.Capacity);
Console.WriteLine("StringBuilder length = "+strBuilder.Length);
strBuilder.EnsureCapacity(0);
strBuilder.Length = 0;
Console.WriteLine("\nStringBuilder capacity= "+strBuilder.Capacity);
Console.WriteLine("StringBuilder length = "+strBuilder.Length);
}
}输出结果
这将产生以下输出-
String = Katie StringBuilder capacity = 16 StringBuilder length = 5 StringBuilder capacity= 35 StringBuilder length = 5 StringBuilder capacity= 35 StringBuilder length = 0