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StringBuilder.Clear Method

Removes all characters from the current StringBuilder instance.

Namespace:  System.Text
Assembly:  mscorlib (in mscorlib.dll)

public StringBuilder Clear()

Return Value

Type: System.Text.StringBuilder
An object whose Length is 0 (zero).

Clear is a convenience method that is equivalent to setting the Length property of the current instance to 0 (zero).

Calling the Clear method does not modify the current instance's Capacity or MaxCapacity property.

The following example instantiates a StringBuilder object with a string, calls the Clear method, and then appends a new string.

using System;
using System.Text;

public class Class1
{
   public static void Main()
   {
      StringBuilder sb = new StringBuilder("This is a string.");
      Console.WriteLine("{0} ({1} characters)", sb.ToString(), sb.Length);

      sb.Clear();
      Console.WriteLine("{0} ({1} characters)", sb.ToString(), sb.Length);

      sb.Append("This is a second string.");
      Console.WriteLine("{0} ({1} characters)", sb.ToString(), sb.Length);
   }
}
// The example displays the following output: 
//       This is a string. (17 characters) 
//        (0 characters) 
//       This is a second string. (24 characters)

.NET Framework

Supported in: 4.6, 4.5, 4

.NET Framework Client Profile

Supported in: 4

Portable Class Library

Supported in: Portable Class Library

Supported in: Windows Phone 8.1

Supported in: Windows Phone Silverlight 8.1

Supported in: Windows Phone Silverlight 8
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