StringBuilder.Equals Method (StringBuilder)

July 28, 2014

Returns a value indicating whether this instance is equal to a specified object.

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

public bool Equals(
	StringBuilder sb
)

Parameters

sb
Type: System.Text.StringBuilder
An object to compare with this instance or null.

Return Value

Type: System.Boolean
true if this instance and sb have equal string, maximum capacity, and Capacity values; otherwise, false.

The following code uses the Equals method to check whether two StringBuilder objects are equal. The method is called repeatedly after small changes are made to each object, and the results are displayed to the console.


using System;
using System.Text;

class Example
{
   public static void Demo(System.Windows.Controls.TextBlock outputBlock)
   {
      StringBuilder sb1 = new StringBuilder("abc");
      StringBuilder sb2 = new StringBuilder("abc", 16);

      outputBlock.Text += "\n";
      outputBlock.Text += String.Format("a1) sb1.Length = {0}, sb1.Capacity = {1}", sb1.Length, sb1.Capacity) + "\n";
      outputBlock.Text += String.Format("a2) sb2.Length = {0}, sb2.Capacity = {1}", sb2.Length, sb2.Capacity) + "\n";
      outputBlock.Text += String.Format("a3) sb1.ToString() = \"{0}\", sb2.ToString() = \"{1}\"",
                             sb1.ToString(), sb2.ToString()) + "\n";
      outputBlock.Text += String.Format("a4) sb1 equals sb2: {0}", sb1.Equals(sb2)) + "\n";

      outputBlock.Text += "\n";
      outputBlock.Text += "Ensure sb1 has a capacity of at least 50 characters." + "\n";
      sb1.EnsureCapacity(50);

      outputBlock.Text += "\n";
      outputBlock.Text += String.Format("b1) sb1.Length = {0}, sb1.Capacity = {1}", sb1.Length, sb1.Capacity) + "\n";
      outputBlock.Text += String.Format("b2) sb2.Length = {0}, sb2.Capacity = {1}", sb2.Length, sb2.Capacity) + "\n";
      outputBlock.Text += String.Format("b3) sb1.ToString() = \"{0}\", sb2.ToString() = \"{1}\"",
                             sb1.ToString(), sb2.ToString()) + "\n";
      outputBlock.Text += String.Format("b4) sb1 equals sb2: {0}", sb1.Equals(sb2)) + "\n";

      outputBlock.Text += "\n";
      outputBlock.Text += "Set the length of sb1 to zero." + "\n";
      outputBlock.Text += "Set the capacity of sb2 to 51 characters." + "\n";
      sb1.Length = 0;
      sb2.Capacity = 51;

      outputBlock.Text += "\n";
      outputBlock.Text += String.Format("c1) sb1.Length = {0}, sb1.Capacity = {1}", sb1.Length, sb1.Capacity) + "\n";
      outputBlock.Text += String.Format("c2) sb2.Length = {0}, sb2.Capacity = {1}", sb2.Length, sb2.Capacity) + "\n";
      outputBlock.Text += String.Format("c3) sb1.ToString() = \"{0}\", sb2.ToString() = \"{1}\"",
                             sb1.ToString(), sb2.ToString()) + "\n";
      outputBlock.Text += String.Format("c4) sb1 equals sb2: {0}", sb1.Equals(sb2)) + "\n";
   }
}
/*
The example displays the following output:

a1) sb1.Length = 3, sb1.Capacity = 16
a2) sb2.Length = 3, sb2.Capacity = 16
a3) sb1.ToString() = "abc", sb2.ToString() = "abc"
a4) sb1 equals sb2: True

Ensure sb1 has a capacity of at least 50 characters.

b1) sb1.Length = 3, sb1.Capacity = 50
b2) sb2.Length = 3, sb2.Capacity = 16
b3) sb1.ToString() = "abc", sb2.ToString() = "abc"
b4) sb1 equals sb2: False

Set the length of sb1 to zero.
Set the capacity of sb2 to 51 characters.

c1) sb1.Length = 0, sb1.Capacity = 50
c2) sb2.Length = 3, sb2.Capacity = 51
c3) sb1.ToString() = "", sb2.ToString() = "abc"
c4) sb1 equals sb2: False
*/


Windows Phone OS

Supported in: 8.1, 8.0, 7.1, 7.0

Windows Phone

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