StringBuilder.Clear Méthode

Définition

Espace de noms:

System.Text

Assemblys:

netstandard.dll, System.Runtime.dll

Source:

StringBuilder.cs

Supprime tous les caractères de l’instance actuelle StringBuilder .

public:
 System::Text::StringBuilder ^ Clear();

public System.Text.StringBuilder Clear();

member this.Clear : unit -> System.Text.StringBuilder

Public Function Clear () As StringBuilder

Retours

StringBuilder

Objet dont Length la valeur est 0 (zéro).

Exemples

L’exemple suivant instancie un StringBuilder objet avec une chaîne, appelle la Clear méthode, puis ajoute une nouvelle chaîne.

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)

open System.Text

let sb = StringBuilder "This is a string."
printfn $"{sb} ({sb.Length} characters)"

sb.Clear() |> ignore
printfn $"{sb} ({sb.Length} characters)"

sb.Append "This is a second string." |> ignore
printfn $"{sb} ({sb.Length} characters)"

// The example displays the following output:
//       This is a string. (17 characters)
//        (0 characters)
//       This is a second string. (24 characters)

Imports System.Text

Module Example
   Public Sub Main()
      Dim sb As 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)
   End Sub            
End Module
' The example displays the following output:
'       This is a string. (17 characters)
'        (0 characters)
'       This is a second string. (24 characters)

Remarques

Clear est une méthode pratique qui équivaut à définir la Length propriété de l’instance actuelle sur 0 (zéro).