如何在C#中从StringBuilder删除所有字符

StringBuilder.Clear方法用于从当前StringBuilder实例中删除所有字符。

语法如下：

public System.Text.StringBuilder Clear ();

它返回一个StringBuilder对象, 其长度将为零。

注意：

• 清除是一种便捷方法, 等效于将当前实例的Length属性设置为0(零)。
• 调用Clear方法不会修改当前实例的Capacity或MaxCapacity属性。

例子：

//C# program to demonstrate
//the Clear() Method
using System;
using System.Text;
  
class GFG {
  
     //Main Method
     public static void Main(String[] args)
     {
         //Creating a StringBuilder object
         StringBuilder sb1 = new StringBuilder( "srcmini" );
  
         //printing the length of "srcmini"
         Console.WriteLine( "The String is: {0} \nTotal characters -- {1}" , sb1.ToString(), sb1.Length);
  
         //using the method
         sb1.Clear();
  
         //printing the length of "srcmini"
         Console.WriteLine( "The String is: {0} \nTotal characters -- {1}" , sb1.ToString(), sb1.Length);
  
         sb1.Append( "This  is C# Tutorials." );
  
         //printing the length of "srcmini"
         Console.WriteLine( "The String is: {0} \nTotal characters -- {1}" , sb1.ToString(), sb1.Length);
     }
}

输出如下：

The String is: srcmini 
Total characters -- 13
The String is:  
Total characters -- 0
The String is: This  is C# Tutorials. 
Total characters -- 22

参考：

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