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。

句法：

public System.Text.StringBuilder Clear ();

它返回一个StringBuilder对象，其长度将为零。

笔记：

• 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("GeeksforGeeks");
  
        // printing the length of "GeeksforGeeks"
        Console.WriteLine("The String is: {0} \nTotal characters -- {1}",
                                             sb1.ToString(), sb1.Length);
  
        // using the method
        sb1.Clear();
  
        // printing the length of "GeeksforGeeks"
        Console.WriteLine("The String is: {0} \nTotal characters -- {1}",
                                             sb1.ToString(), sb1.Length);
  
        sb1.Append("This  is C# Tutorials.");
  
        // printing the length of "GeeksforGeeks"
        Console.WriteLine("The String is: {0} \nTotal characters -- {1}",
                                             sb1.ToString(), sb1.Length);
    }
}

输出：

The String is: GeeksforGeeks 
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/zh-cn/dotnet/api/system.text.stringbuilder.clear?view=netframework-4.7.2