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Guid.CompareTo Method (Guid)

Compares this instance to a specified Guid object and returns an indication of their relative values.

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

public int CompareTo(
	Guid value
)

Parameters

value
Type: System.Guid
A Guid object to compare to this instance.

Return Value

Type: System.Int32
A signed number indicating the relative values of this instance and value.

Value

Description

A negative integer

This instance is less than value.

Zero

This instance is equal to value.

A positive integer

This instance is greater than value.

Implements

IComparable<T>.CompareTo(T)

This method implements the System.IComparable<T> interface and performs slightly better than the Guid.CompareTo method because it does not have to convert the value parameter to an object.

The following example demonstrates generic and nongeneric versions of CompareTo for several value and reference types.


// This example demonstrates the generic and non-generic versions of the 
// CompareTo method for several base types.
// The non-generic version takes a parameter of type Object, while the generic
// version takes a type-specific parameter, such as Boolean, Int32, or Double.

using System;

class Example
{
   public static void Demo(System.Windows.Controls.TextBlock outputBlock)
   {
      string nl = "\n";
      string msg = "{0}The following is the result of using the generic and non-generic{0}" +
                      "versions of the CompareTo method for several base types:{0}";

      DateTime now = DateTime.Now;
      // Time span = 11 days, 22 hours, 33 minutes, 44 seconds
      TimeSpan tsX = new TimeSpan(11, 22, 33, 44);
      // Version = 1.2.333.4
      Version versX = new Version("1.2.333.4");
      // Guid = CA761232-ED42-11CE-BACD-00AA0057B223
      Guid guidX = new Guid("{CA761232-ED42-11CE-BACD-00AA0057B223}");

      Boolean a1 = true, a2 = true;
      Byte b1 = 1, b2 = 1;
      Int16 c1 = -2, c2 = 2;
      Int32 d1 = 3, d2 = 3;
      Int64 e1 = 4, e2 = -4;
      Decimal f1 = -5.5m, f2 = 5.5m;
      Single g1 = 6.6f, g2 = 6.6f;
      Double h1 = 7.7d, h2 = -7.7d;
      Char i1 = 'A', i2 = 'A';
      String j1 = "abc", j2 = "abc";
      DateTime k1 = now, k2 = now;
      TimeSpan l1 = tsX, l2 = tsX;
      Version m1 = versX, m2 = new Version("2.0");
      Guid n1 = guidX, n2 = guidX;

      // The following types are not CLS-compliant.
      SByte w1 = 8, w2 = 8;
      UInt16 x1 = 9, x2 = 9;
      UInt32 y1 = 10, y2 = 10;
      UInt64 z1 = 11, z2 = 11;
      //
      outputBlock.Text += String.Format(msg, nl) + "\n";
      try
      {
         // The second and third Show method call parameters are automatically boxed because
         // the second and third Show method declaration arguments expect type Object.

         Show(outputBlock, "Boolean:  ", a1, a2, a1.CompareTo(a2), a1.CompareTo((Object)a2));
         Show(outputBlock, "Byte:     ", b1, b2, b1.CompareTo(b2), b1.CompareTo((Object)b2));
         Show(outputBlock, "Int16:    ", c1, c2, c1.CompareTo(c2), c1.CompareTo((Object)c2));
         Show(outputBlock, "Int32:    ", d1, d2, d1.CompareTo(d2), d1.CompareTo((Object)d2));
         Show(outputBlock, "Int64:    ", e1, e2, e1.CompareTo(e2), e1.CompareTo((Object)e2));
         Show(outputBlock, "Decimal:  ", f1, f2, f1.CompareTo(f2), f1.CompareTo((Object)f2));
         Show(outputBlock, "Single:   ", g1, g2, g1.CompareTo(g2), g1.CompareTo((Object)g2));
         Show(outputBlock, "Double:   ", h1, h2, h1.CompareTo(h2), h1.CompareTo((Object)h2));
         Show(outputBlock, "Char:     ", i1, i2, i1.CompareTo(i2), i1.CompareTo((Object)i2));
         Show(outputBlock, "String:   ", j1, j2, j1.CompareTo(j2), j1.CompareTo((Object)j2));
         Show(outputBlock, "DateTime: ", k1, k2, k1.CompareTo(k2), k1.CompareTo((Object)k2));
         Show(outputBlock, "TimeSpan: ", l1, l2, l1.CompareTo(l2), l1.CompareTo((Object)l2));
         Show(outputBlock, "Version:  ", m1, m2, m1.CompareTo(m2), m1.CompareTo((Object)m2));
         Show(outputBlock, "Guid:     ", n1, n2, n1.CompareTo(n2), n1.CompareTo((Object)n2));
         //
         outputBlock.Text += String.Format("{0}The following types are not CLS-compliant:", nl) + "\n";
         Show(outputBlock, "SByte:    ", w1, w2, w1.CompareTo(w2), w1.CompareTo((Object)w2));
         Show(outputBlock, "UInt16:   ", x1, x2, x1.CompareTo(x2), x1.CompareTo((Object)x2));
         Show(outputBlock, "UInt32:   ", y1, y2, y1.CompareTo(y2), y1.CompareTo((Object)y2));
         Show(outputBlock, "UInt64:   ", z1, z2, z1.CompareTo(z2), z1.CompareTo((Object)z2));
      }
      catch (Exception e)
      {
         outputBlock.Text += e + "\n";
      }
   }

   public static void Show(System.Windows.Controls.TextBlock outputBlock, string caption, Object var1, Object var2,
                           int resultGeneric, int resultNonGeneric)
   {
      string relation;

      outputBlock.Text += caption;
      if (resultGeneric == resultNonGeneric)
      {
         if (resultGeneric < 0) relation = "less than";
         else if (resultGeneric > 0) relation = "greater than";
         else relation = "equal to";
         outputBlock.Text += String.Format("{0} is {1} {2}", var1, relation, var2) + "\n";
      }

  // The following condition will never occur because the generic and non-generic
      // CompareTo methods are equivalent.

      else
      {
         outputBlock.Text += String.Format("Generic CompareTo = {0}; non-generic CompareTo = {1}",
                            resultGeneric, resultNonGeneric) + "\n";
      }
   }
}
/*
This example produces the following results:

The following is the result of using the generic and non-generic versions of the
CompareTo method for several base types:

Boolean:  True is equal to True
Byte:     1 is equal to 1
Int16:    -2 is less than 2
Int32:    3 is equal to 3
Int64:    4 is greater than -4
Decimal:  -5.5 is less than 5.5
Single:   6.6 is equal to 6.6
Double:   7.7 is greater than -7.7
Char:     A is equal to A
String:   abc is equal to abc
DateTime: 12/1/2003 5:37:46 PM is equal to 12/1/2003 5:37:46 PM
TimeSpan: 11.22:33:44 is equal to 11.22:33:44
Version:  1.2.333.4 is less than 2.0
Guid:     ca761232-ed42-11ce-bacd-00aa0057b223 is equal to ca761232-ed42-11ce-bacd-00
aa0057b223

The following types are not CLS-compliant:
SByte:    8 is equal to 8
UInt16:   9 is equal to 9
UInt32:   10 is equal to 10
UInt64:   11 is equal to 11
*/


Silverlight

Supported in: 5, 4, 3

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0

XNA Framework

Supported in: Xbox 360, Windows Phone OS 7.0

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.

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