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Metodo UInt16.CompareTo (UInt16)

Confronta questa istanza con un valore integer senza segno a 16 bit specificato e restituisce un'indicazione dei valori relativi.

Questo metodo non è compatibile con CLS.  

Spazio dei nomi: System
Assembly: mscorlib (in mscorlib.dll)

public int CompareTo (
	ushort value
)
public final int CompareTo (
	UInt16 value
)
public final function CompareTo (
	value : ushort
) : int
Non applicabile.

Parametri

value

Valore integer senza segno da confrontare.

Valore restituito

Numero con segno che indica i valori relativi di questa istanza e di value.

Valore restituito

Descrizione

Minore di zero

L'istanza è minore di value.

Zero

L'istanza è uguale a value.

Maggiore di zero

L'istanza è maggiore di value.

In questo metodo viene implementata l'interfaccia System.IComparable e le prestazioni sono leggermente migliori rispetto al metodo UInt16.CompareTo, perché non è necessario convertire il parametro value in un oggetto.

A seconda del linguaggio di programmazione, è possibile codificare un metodo CompareTo in cui il tipo di parametro presenta meno bit del tipo di istanza. Questo è possibile poiché in alcuni linguaggi di programmazione viene eseguita una conversione implicita verso il tipo di dati più grande che rappresenta il parametro come un tipo con lo stesso numero di bit dell'istanza.

Si supponga ad esempio che il tipo di istanza sia Int32 e che il tipo di parametro sia Byte. Il compilatore Microsoft C# genera istruzioni per rappresentare il valore del parametro come oggetto Int32, quindi genera un metodo Int32.CompareTo che consente il confronto dei valori dell'istanza Int32 e la rappresentazione del parametro Int32.

Consultare la documentazione relativa al linguaggio di programmazione utilizzato per determinare se il compilatore esegue conversioni implicite verso un tipo di dati più grande su tipi numerici.

Nell'esempio di codice riportato di seguito vengono illustrate le versioni generica e non generica del metodo CompareTo per vari tipi di valore e di riferimento.

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

    public static void Show(string caption, Object var1, Object var2, 
                            int resultGeneric, int resultNonGeneric)
    {
    string relation;

    Console.Write(caption);
    if (resultGeneric == resultNonGeneric) 
        {
        if      (resultGeneric < 0) relation = "less than";
        else if (resultGeneric > 0) relation = "greater than";
        else                        relation = "equal to";
        Console.WriteLine("{0} is {1} {2}", var1, relation, var2);
        }

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

    else
        {
        Console.WriteLine("Generic CompareTo = {0}; non-generic CompareTo = {1}", 
                           resultGeneric, resultNonGeneric);
        }
   }
}
/*
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
*/

// 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.

import System.*;

class Sample
{
    public static void main(String[] args)
    {
        String nl = Environment.get_NewLine();
        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.get_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}");

        System.Boolean a1 = true,a2 = true;
        System.Byte b1 = (System.Byte)1,b2 =(System.Byte)1;
        Int16 c1 = (System.Int16)(-2),c2 = (System.Int16)2;
        Int32 d1 = (System.Int32)3,d2 = (System.Int32)3;
        Int64 e1 = (System.Int64)4,e2 = (System.Int64)(-4);
        Decimal f1 = new Decimal(-5.5),f2 = new Decimal(5.5);
        Single g1 = (System.Single)6.6,g2 = (System.Single)6.6;
        System.Double h1 = (System.Double)7.7,h2 = (System.Double)(-7.7);
        System.Char i1 = (System.Char)'A',i2 = (System.Char)'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 = (System.SByte)8,w2 = (System.SByte)8;
        UInt16 x1 = (System.UInt16)9,x2 = (System.UInt16)9;
        UInt32 y1 = (System.UInt32)10,y2 = (System.UInt32)10;
        UInt64 z1 = (System.UInt64)11,z2 = (System.UInt64)11;
        //
        Console.WriteLine(msg, nl);
        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("Boolean:  ", a1, a2, a1.CompareTo(a2),
                a1.CompareTo((Object)a2));
            Show("Byte:     ", b1, b2, b1.CompareTo(b2),
                b1.CompareTo((Object)b2));
            Show("Int16:    ", c1, c2, c1.CompareTo(c2), 
                c1.CompareTo((Object)c2));
            Show("Int32:    ", d1, d2, d1.CompareTo(d2),
                d1.CompareTo((Object)d2));
            Show("Int64:    ", e1, e2, e1.CompareTo(e2),
                e1.CompareTo(((Object)e2)));
            Show("Decimal:  ", f1, f2, f1.CompareTo(f2),
                f1.CompareTo((Object)f2));
            Show("Single:   ", g1, g2, g1.CompareTo(g2),
                g1.CompareTo((Object)g2));
            Show("Double:   ", h1, h2, h1.CompareTo(h2),
                h1.CompareTo((Object)h2));
            Show("Char:     ", i1, i2, i1.CompareTo(i2), 
                i1.CompareTo(((Object)i2)));
            Show("String:   ", j1, j2, j1.CompareTo(j2),
                j1.CompareTo((Object)j2));
            Show("DateTime: ", k1, k2, k1.CompareTo(k2),
                k1.CompareTo((Object)(k2)));
            Show("TimeSpan: ", l1, l2, l1.CompareTo(l2),
                l1.CompareTo((Object)l2));
            Show("Version:  ", m1, m2, m1.CompareTo(m2), 
                m1.CompareTo((Object)m2));
            Show("Guid:     ", n1, n2, n1.CompareTo(n2), 
                n1.CompareTo((Object)n2));
            //
            Console.WriteLine(
                "{0}The following types are not CLS-compliant:", nl);
            Show("SByte:    ", w1, w2, w1.CompareTo(w2),
                w1.CompareTo((Object)w2));
            Show("UInt16:   ", x1, x2, x1.CompareTo(x2), 
                x1.CompareTo((Object)x2));
            Show("UInt32:   ", y1, y2, y1.CompareTo(y2),
                y1.CompareTo((Object)y2));
            Show("UInt64:   ", z1, z2, z1.CompareTo(z2),
                z1.CompareTo((Object)z2));
        }
        catch (System.Exception e) {
            Console.WriteLine(e);
        }
    } //main

    public static void Show(String caption, Object var1, Object var2,
        int resultGeneric, int resultNonGeneric)
    {
        String relation;

        Console.Write(caption);
        if (resultGeneric == resultNonGeneric) {
            if (resultGeneric < 0) {
                relation = "less than";
            }
            else {
                if (resultGeneric > 0) {
                    relation = "greater than";
                }
                else {
                    relation = "equal to";
                }
            }
            Console.WriteLine("{0} is {1} {2}", var1, relation, var2);
        }
        // The following condition will never occur because the generic and 
        // non-generic CompareTo methods are equivalent.
        else {
            Console.WriteLine("Generic CompareTo = {0};"
                +" non-generic CompareTo = {1}",
                System.Convert.ToString(resultGeneric),
                System.Convert.ToString(resultNonGeneric));
        }
    } //Show
} //Sample
/*
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-00aa0057b223

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
*/

Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile per Pocket PC, Windows Mobile per Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

Microsoft .NET Framework 3.0 è supportato in Windows Vista, Microsoft Windows XP SP2 e Windows Server 2003 SP1.

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