StringBuilder。C# 中的保证能力()方法
原文:https://www . geeksforgeeks . org/stringbuilder-ensurecapacity-method-in-c-sharp/
StringBuilder 类的 EnsureCapacity(Int32)方法帮助我们确保容量至少等于作为参数传递给该方法的指定值。如果当前容量小于容量参数，则重新分配此实例的内存，以至少容纳容量数量的字符；否则，不会改变内存。
语法:public int EnsureCapacity(int capacity)； 在这里，容量是保证的最小容量。
返回值:返回当前实例的新容量。
异常:如果容量小于零或扩大该实例的值会超过最大容量，该方法将给出argumentout of range Exception。
例 1:
// C# program to demonstrate
// the EnsureCapacity Method
using System;
using System.Text;
class GFG {
// Main Method
public static void Main(String[] args)
{
// create a StringBuilder object
StringBuilder str = new StringBuilder();
// print string capacity
Console.WriteLine("Before EnsureCapacity "
+ "method capacity = "
+ str.Capacity);
// apply ensureCapacity()
str.EnsureCapacity(18);
// print string capacity
Console.WriteLine("After EnsureCapacity"
+ " method capacity = "
+ str.Capacity);
}
}
Output:
Before EnsureCapacity method capacity = 16
After EnsureCapacity method capacity = 18
例 2:
// C# program to demonstrate
// the EnsureCapacity Method
using System;
using System.Text;
class GFG {
// Main Method
public static void Main(String[] args)
{
// create a StringBuilder object
StringBuilder str = new StringBuilder();
// print string capacity
Console.WriteLine("Before EnsureCapacity "
+ "method capacity = "
+ str.Capacity);
// apply ensureCapacity()
str.EnsureCapacity(44);
// print string capacity
Console.WriteLine("After EnsureCapacity"
+ " method capacity = "
+ str.Capacity);
}
}
Output:
Before EnsureCapacity method capacity = 16
After EnsureCapacity method capacity = 44
参考:
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