String.CompareTo Metod

Definition

Namnområde:
System
Sammansättningar:
netstandard.dll, System.Runtime.dll
Sammansättning:
System.Runtime.dll
Sammansättning:
mscorlib.dll
Sammansättning:
netstandard.dll
Sammansättningar:
mscorlib.dll, System.Runtime.dll

Jämför den här instansen med ett angivet objekt eller String och returnerar ett heltal som anger om den här instansen föregår, följer eller visas i samma position i sorteringsordningen som det angivna objektet eller String.

Överlagringar

Name Description
CompareTo(Object)

Jämför den här instansen med en angiven Object och anger om den här instansen föregår, följer eller visas i samma position i sorteringsordningen som den angivna Object.
CompareTo(String)

Jämför den här instansen med ett angivet String objekt och anger om den här instansen föregår, följer eller visas i samma position i sorteringsordningen som den angivna strängen.

Kommentarer

Båda överlagringarna av CompareTo metoden utför kulturkänsliga och skiftlägeskänsliga jämförelser. Du kan inte använda den här metoden för att utföra kulturokänsliga eller ordningskänsliga jämförelser. För tydlighetens CompareTo kod rekommenderar vi att du undviker metoden och anropar Compare metoden i stället.

CompareTo(Object)

Källa:
String.Comparison.cs
Källa:
String.Comparison.cs
Källa:
String.Comparison.cs
Källa:
String.Comparison.cs
Källa:
String.Comparison.cs

Jämför den här instansen med en angiven Object och anger om den här instansen föregår, följer eller visas i samma position i sorteringsordningen som den angivna Object.

public:
 virtual int CompareTo(System::Object ^ value);
public int CompareTo(object? value);
public int CompareTo(object value);
abstract member CompareTo : obj -> int
override this.CompareTo : obj -> int
Public Function CompareTo (value As Object) As Integer

Parametrar

value
Object

Ett objekt som utvärderas till en String.

Returer

Int32

Ett 32-bitars signerat heltal som anger om den här instansen föregår, följer eller visas i samma position i sorteringsordningen som parametern value .

Värde Tillstånd
Mindre än noll Den här instansen föregår value.
Noll Den här instansen har samma position i sorteringsordningen som value.
Större än noll Den här instansen följer value.

-eller-

value är null.

Implementeringar

CompareTo(Object)

Undantag

ArgumentException

value är inte en String.

Exempel

I följande exempel används CompareTo metoden med en Object. Eftersom den försöker jämföra en String instans med ett TestClass objekt genererar metoden en ArgumentException.

using System;

public class TestClass
{}

public class Example
{
   public static void Main()
   {
      var test = new TestClass();
      Object[] objectsToCompare = { test, test.ToString(), 123,
                                    123.ToString(), "some text",
                                    "Some Text" };
      string s = "some text";
      foreach (var objectToCompare in objectsToCompare) {
         try {
            int i = s.CompareTo(objectToCompare);
            Console.WriteLine("Comparing '{0}' with '{1}': {2}",
                              s, objectToCompare, i);
         }
         catch (ArgumentException) {
            Console.WriteLine("Bad argument: {0} (type {1})",
                              objectToCompare,
                              objectToCompare.GetType().Name);
         }
      }
   }
}
// The example displays the following output:
//    Bad argument: TestClass (type TestClass)
//    Comparing 'some text' with 'TestClass': -1
//    Bad argument: 123 (type Int32)
//    Comparing 'some text' with '123': 1
//    Comparing 'some text' with 'some text': 0
//    Comparing 'some text' with 'Some Text': -1

open System

type TestClass() = class end

let test = TestClass()
let objectsToCompare: obj list =
    [ test; string test; 123
      string 123; "some text"
      "Some Text" ]
let s = "some text"
for objectToCompare in objectsToCompare do
    try
        let i = s.CompareTo objectToCompare
        printfn $"Comparing '{s}' with '{objectToCompare}': {i}"
    with :? ArgumentException ->
        printfn $"Bad argument: {objectToCompare} (type {objectToCompare.GetType().Name})"
// The example displays the following output:
//    Bad argument: TestClass (type TestClass)
//    Comparing 'some text' with 'TestClass': -1
//    Bad argument: 123 (type Int32)
//    Comparing 'some text' with '123': 1
//    Comparing 'some text' with 'some text': 0
//    Comparing 'some text' with 'Some Text': -1

Public Class TestClass
End Class 


Public Class Example
   Public Shared Sub Main()
      Dim test As New TestClass()
      Dim objectsToCompare() As Object = { test, test.ToString(), 123,
                                           123.ToString(), "some text",
                                           "Some Text" }
      Dim s As String = "some text"
      For Each objectToCompare In objectsToCompare
         Try
            Dim i As Integer = s.CompareTo(objectToCompare)
            Console.WriteLine("Comparing '{0}' with '{1}': {2}",
                              s, objectToCompare, i)
         Catch e As ArgumentException
            Console.WriteLine("Bad argument: {0} (type {1})",
                              objectToCompare,
                              objectToCompare.GetType().Name)
         End Try
      Next
   End Sub 
End Class 
' The example displays the following output:
'       Bad argument: TestClass (type TestClass)
'       Comparing 'some text' with 'TestClass': -1
'       Bad argument: 123 (type Int32)
'       Comparing 'some text' with '123': 1
'       Comparing 'some text' with 'some text': 0
'       Comparing 'some text' with 'Some Text': -1

Kommentarer

value måste vara ett String objekt.

Caution

Metoden CompareTo har främst utformats för sortering eller alfabetisering. Det bör inte användas när det primära syftet med metodanropet är att avgöra om två strängar är likvärdiga. Om du vill avgöra om två strängar är likvärdiga anropar du Equals metoden.

Den här metoden utför en ordjämförelse (skiftlägeskänslig och kulturkänslig) med hjälp av den aktuella kulturen. Mer information om ord, sträng och ordningstal finns i System.Globalization.CompareOptions.

Mer information om beteendet för den här metoden finns i avsnittet Kommentarer i String.Compare(String, String) metoden.

Anteckningar till anropare

Teckenuppsättningar innehåller okunniga tecken. Metoden CompareTo(Object) tar inte hänsyn till sådana tecken när den utför en kulturkänslig jämförelse. Om till exempel följande kod körs på .NET Framework 4 eller senare, anger en jämförelse av "animal" med "ani-mal" (med ett mjukt bindestreck eller U+00AD) att de två strängarna är likvärdiga.

using System;

public class Example
{
   public static void Main()
   {
      string s1 = "ani\u00ADmal";
      object o1 = "animal";
      
      Console.WriteLine("Comparison of '{0}' and '{1}': {2}", 
                        s1, o1, s1.CompareTo(o1));
   }
}
// The example displays the following output:
//       Comparison of 'ani-mal' and 'animal': 0

let s1 = "ani\u00ADmal"
let o1: obj = "animal"
      
printfn $"Comparison of '{s1}' and '{o1}': {s1.CompareTo o1}"
// The example displays the following output:
//       Comparison of 'ani-mal' and 'animal': 0

Module Example
   Public Sub Main()
      Dim s1 As String = "ani" + ChrW(&h00AD) + "mal"
      Dim o1 As Object = "animal"
      
      Console.WriteLine("Comparison of '{0}' and '{1}': {2}", 
                        s1, o1, s1.CompareTo(o1))
  End Sub
End Module
' The example displays the following output:
'       Comparison of 'ani-mal' and 'animal': 0

Om du vill känna igen okunniga tecken i en strängjämförelse anropar du CompareOrdinal(String, String) metoden.

Se även

Gäller för

CompareTo(String)

Källa:
String.Comparison.cs
Källa:
String.Comparison.cs
Källa:
String.Comparison.cs
Källa:
String.Comparison.cs
Källa:
String.Comparison.cs

Jämför den här instansen med ett angivet String objekt och anger om den här instansen föregår, följer eller visas i samma position i sorteringsordningen som den angivna strängen.

public:
 virtual int CompareTo(System::String ^ strB);
public:
 int CompareTo(System::String ^ strB);
public int CompareTo(string strB);
public int CompareTo(string? strB);
abstract member CompareTo : string -> int
override this.CompareTo : string -> int
member this.CompareTo : string -> int
Public Function CompareTo (strB As String) As Integer

Parametrar

strB
String

Strängen som ska jämföras med den här instansen.

Returer

Int32

Ett 32-bitars signerat heltal som anger om den här instansen föregår, följer eller visas i samma position i sorteringsordningen som parametern strB .

Värde Tillstånd
Mindre än noll Den här instansen föregår strB.
Noll Den här instansen har samma position i sorteringsordningen som strB.
Större än noll Den här instansen följer strB.

-eller-

strB är null.

Implementeringar

CompareTo(T)

Exempel

I följande exempel används CompareTo metoden för att jämföra den aktuella stränginstansen med en annan sträng.

using System;

public class Example
{
   public static void Main()
   {
      string strFirst = "Goodbye";
      string strSecond = "Hello";
      string strThird = "a small string";
      string strFourth = "goodbye";

      // Compare a string to itself.
      Console.WriteLine(CompareStrings(strFirst, strFirst));

      Console.WriteLine(CompareStrings(strFirst, strSecond));
      Console.WriteLine(CompareStrings(strFirst, strThird));

      // Compare a string to another string that varies only by case.
      Console.WriteLine(CompareStrings(strFirst, strFourth));
      Console.WriteLine(CompareStrings(strFourth, strFirst));
   }

   private static string CompareStrings( string str1, string str2 )
   {
      // Compare the values, using the CompareTo method on the first string.
      int cmpVal = str1.CompareTo(str2);

       if (cmpVal == 0) // The strings are the same.
         return "The strings occur in the same position in the sort order.";
      else if (cmpVal < 0)
         return "The first string precedes the second in the sort order.";
      else
         return "The first string follows the second in the sort order.";
    }
}
// The example displays the following output:
//       The strings occur in the same position in the sort order.
//       The first string precedes the second in the sort order.
//       The first string follows the second in the sort order.
//       The first string follows the second in the sort order.
//       The first string precedes the second in the sort order.

let strFirst = "Goodbye"
let strSecond = "Hello"
let strThird = "a small string"
let strFourth = "goodbye"

let compareStrings (str1: string) str2 =
    // Compare the values, using the CompareTo method on the first string.
    match str1.CompareTo str2 with
    | 0 -> // The strings are the same.
        "The strings occur in the same position in the sort order."
    | x when x < 0 ->
        "The first string precedes the second in the sort order."
    | _ ->
        "The first string follows the second in the sort order."

// Compare a string to itself.
printfn $"{compareStrings strFirst strFirst}"

printfn $"{compareStrings strFirst strSecond}"
printfn $"{compareStrings strFirst strThird}"

// Compare a string to another string that varies only by case.
printfn $"{compareStrings strFirst strFourth}"
printfn $"{compareStrings strFourth strFirst}"

// The example displays the following output:
//       The strings occur in the same position in the sort order.
//       The first string precedes the second in the sort order.
//       The first string follows the second in the sort order.
//       The first string follows the second in the sort order.
//       The first string precedes the second in the sort order.

Public Module Example
   Public Sub Main()
      Dim strFirst As String = "Goodbye"
      Dim strSecond As String = "Hello"
      Dim strThird As String = "a small string"
      Dim strFourth As String = "goodbye"

      ' Compare a string to itself.
      Console.WriteLine(CompareStrings(strFirst, strFirst))
        
      Console.WriteLine(CompareStrings(strFirst, strSecond))
      Console.WriteLine(CompareStrings(strFirst, strThird))
        
      ' Compare a string to another string that varies only by case.
      Console.WriteLine(CompareStrings(strFirst, strFourth))
      Console.WriteLine(CompareStrings(strFourth, strFirst))
   End Sub
    
   Private Function CompareStrings(str1 As String, str2 As String) As String
      Dim cmpVal As Integer = str1.CompareTo(str2)
      If cmpVal = 0 Then
         ' The values are the same.
         Return "The strings occur in the same position in the sort order."
      ElseIf cmpVal < 0 Then
         Return "The first string precedes the second in the sort order."
      Else
         Return "The first string follows the second in the sort order."
      End If
   End Function
End Module
' This example displays the following output:
'       The strings occur in the same position in the sort order.
'       The strings occur in the same position in the sort order.
'       The first string precedes the second in the sort order.
'       The first string follows the second in the sort order.
'       The first string follows the second in the sort order.
'       The first string precedes the second in the sort order.

I följande exempel visas generiska och icke-generiska versioner av metoden CompareTo för flera värde- och referenstyper.

// 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.
open System

let show caption (var1: obj) (var2: obj) resultGeneric resultNonGeneric =
    printf "%s" caption
    if resultGeneric = resultNonGeneric then
        let relation =
            if resultGeneric < 0 then "less than"
            elif resultGeneric > 0 then "greater than"
            else "equal to"
        printfn $"{var1} is {relation} {var2}"

    // The following condition will never occur because the generic and non-generic
    // CompareTo methods are equivalent.
    else
        printfn $"Generic CompareTo = {resultGeneric} non-generic CompareTo = {resultNonGeneric}"

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

let a1, a2 = true, true
let b1, b2 = 1uy, 1uy
let c1, c2 = -2s, 2s
let d1, d2 = 3, 3
let e1, e2 = 4L, -4L
let f1, f2 = -5.5m, 5.5m
let g1, g2 = 6.6f, 6.6f
let h1, h2 = 7.7, -7.7
let i1, i2 = 'A', 'A'
let j1, j2 = "abc", "abc"
let k1, k2 = now, now
let l1, l2 = tsX, tsX
let m1, m2 = versX, Version "2.0"
let n1, n2 = guidX, guidX

// The following types are not CLS-compliant.
let w1, w2 = 8y, 8y
let x1, x2 = 9us, 9us
let y1, y2 = 10u, 10u
let z1, z2 = 11uL, 11uL

printfn "\nThe following is the result of using the generic and non-generic\nversions of the CompareTo method for several base types:\n"
try
    // The second and third show function call parameters are automatically boxed because
    // the second and third show function declaration arguments expect type Object.
    show "Boolean:  " a1 a2 (a1.CompareTo a2) (a1.CompareTo (a2 :> obj))

    show "Byte:     " b1 b2 (b1.CompareTo b2) (b1.CompareTo (b2 :> obj))
    show "Int16:    " c1 c2 (c1.CompareTo c2) (c1.CompareTo (c2 :> obj))
    show "Int32:    " d1 d2 (d1.CompareTo d2) (d1.CompareTo (d2 :> obj))
    show "Int64:    " e1 e2 (e1.CompareTo e2) (e1.CompareTo (e2 :> obj))
    show "Decimal:  " f1 f2 (f1.CompareTo f2) (f1.CompareTo (f2 :> obj))
    show "Single:   " g1 g2 (g1.CompareTo g2) (g1.CompareTo (g2 :> obj))
    show "Double:   " h1 h2 (h1.CompareTo h2) (h1.CompareTo (h2 :> obj))
    show "Char:     " i1 i2 (i1.CompareTo i2) (i1.CompareTo (i2 :> obj))
    show "String:   " j1 j2 (j1.CompareTo j2) (j1.CompareTo (j2 :> obj))
    show "DateTime: " k1 k2 (k1.CompareTo k2) (k1.CompareTo (k2 :> obj))
    show "TimeSpan: " l1 l2 (l1.CompareTo l2) (l1.CompareTo (l2 :> obj))
    show "Version:  " m1 m2 (m1.CompareTo m2) (m1.CompareTo (m2 :> obj))
    show "Guid:     " n1 n2 (n1.CompareTo n2) (n1.CompareTo (n2 :> obj))

    printfn "\nThe following types are not CLS-compliant:"
    show "SByte:    " w1 w2 (w1.CompareTo w2) (w1.CompareTo (w2 :> obj))
    show "UInt16:   " x1 x2 (x1.CompareTo x2) (x1.CompareTo (x2 :> obj))
    show "UInt32:   " y1 y2 (y1.CompareTo y2) (y1.CompareTo (y2 :> obj))
    show "UInt64:   " z1 z2 (z1.CompareTo z2) (z1.CompareTo (z2 :> obj))
with e -> printfn $"{e}"


// 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.

Class Sample
   Public Shared Sub Main()
      Dim nl As String = Environment.NewLine
      Dim msg As String = _
          "{0}The following is the result of using the generic and non-generic{0}" & _
          "versions of the CompareTo method for several base types:{0}"
      
      Dim now As DateTime = DateTime.Now
      ' Time span = 11 days, 22 hours, 33 minutes, 44 seconds
      Dim tsX As New TimeSpan(11, 22, 33, 44)
      ' Version = 1.2.333.4
      Dim versX As New Version("1.2.333.4")
      ' Guid = CA761232-ED42-11CE-BACD-00AA0057B223
      Dim guidX As New Guid("{CA761232-ED42-11CE-BACD-00AA0057B223}")
      
      Dim a1 As [Boolean] = True,    a2 As [Boolean] = True
      Dim b1 As [Byte] = 1,          b2 As [Byte] = 1
      Dim c1 As Int16 = -2,          c2 As Int16 = 2
      Dim d1 As Int32 = 3,           d2 As Int32 = 3
      Dim e1 As Int64 = 4,           e2 As Int64 = -4
      Dim f1 As [Decimal] = -5.5D,   f2 As [Decimal] = 5.5D
      Dim g1 As [Single] = 6.6F,     g2 As [Single] = 6.6F
      Dim h1 As [Double] = 7.7,      h2 As [Double] = -7.7
      Dim i1 As [Char] = "A"c,       i2 As [Char] = "A"c
      Dim j1 As String = "abc",      j2 As String = "abc"
      Dim k1 As DateTime = now,      k2 As DateTime = now
      Dim l1 As TimeSpan = tsX,      l2 As TimeSpan = tsX
      Dim m1 As Version = versX,     m2 As New Version("2.0")
      Dim n1 As Guid = guidX,        n2 As Guid = guidX
      
      ' The following types are not CLS-compliant.
      ' SByte, UInt16, UInt32, UInt64

      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(CObj(a2)))
         Show("Byte:     ", b1, b2, b1.CompareTo(b2), b1.CompareTo(CObj(b2)))
         Show("Int16:    ", c1, c2, c1.CompareTo(c2), c1.CompareTo(CObj(c2)))
         Show("Int32:    ", d1, d2, d1.CompareTo(d2), d1.CompareTo(CObj(d2)))
         Show("Int64:    ", e1, e2, e1.CompareTo(e2), e1.CompareTo(CObj(e2)))
         Show("Decimal:  ", f1, f2, f1.CompareTo(f2), f1.CompareTo(CObj(f2)))
         Show("Single:   ", g1, g2, g1.CompareTo(g2), g1.CompareTo(CObj(g2)))
         Show("Double:   ", h1, h2, h1.CompareTo(h2), h1.CompareTo(CObj(h2)))
         Show("Char:     ", i1, i2, i1.CompareTo(i2), i1.CompareTo(CObj(i2)))
         Show("String:   ", j1, j2, j1.CompareTo(j2), j1.CompareTo(CObj(j2)))
         Show("DateTime: ", k1, k2, k1.CompareTo(k2), k1.CompareTo(CObj(k2)))
         Show("TimeSpan: ", l1, l2, l1.CompareTo(l2), l1.CompareTo(CObj(l2)))
         Show("Version:  ", m1, m2, m1.CompareTo(m2), m1.CompareTo(CObj(m2)))
         Show("Guid:     ", n1, n2, n1.CompareTo(n2), n1.CompareTo(CObj(n2)))
         '
         Console.WriteLine("{0}The following types are not CLS-compliant:", nl)
         Console.WriteLine("SByte, UInt16, UInt32, UInt64")

      Catch e As Exception
         Console.WriteLine(e)
      End Try
   End Sub
   
   Public Shared Sub Show(caption As String, var1 As [Object], var2 As [Object], _
                          resultGeneric As Integer, resultNonGeneric As Integer)
      Dim relation As String
      
      Console.Write(caption)
      If resultGeneric = resultNonGeneric Then
         If resultGeneric < 0 Then
            relation = "less than"
         ElseIf resultGeneric > 0 Then
            relation = "greater than"
         Else
            relation = "equal to"
         End If
         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)
      End If
   End Sub
End Class
'
'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, UInt16, UInt32, UInt64
'

Kommentarer

Den här metoden utför en ordjämförelse (skiftlägeskänslig och kulturkänslig) med hjälp av den aktuella kulturen. Mer information om ord, sträng och ordningstal finns i System.Globalization.CompareOptions.

Caution

Metoden CompareTo har främst utformats för sortering eller alfabetisering. Det bör inte användas när det primära syftet med metodanropet är att avgöra om två strängar är likvärdiga. Om du vill avgöra om två strängar är likvärdiga anropar du Equals metoden.

Mer information om beteendet för den här metoden finns i avsnittet Kommentarer i Compare(String, String) metoden.

Den här metoden implementerar System.IComparable<T> gränssnittet och presterar något bättre än String.CompareTo(Object) metoden eftersom den inte behöver avgöra om strB argumentet är en föränderlig värdetyp som måste boxas, och den behöver inte omvandla parametern från en Object till en String.

Anteckningar till anropare

Teckenuppsättningar innehåller okunniga tecken. Metoden CompareTo(String) tar inte hänsyn till sådana tecken när den utför en kulturkänslig jämförelse. Om till exempel följande kod körs på .NET Framework 4 eller senare, anger en jämförelse av "animal" med "ani-mal" (med ett mjukt bindestreck eller U+00AD) att de två strängarna är likvärdiga.

using System;

public class Example
{
   public static void Main()
   {
      string s1 = "ani\u00ADmal";
      string s2 = "animal";
      
      Console.WriteLine("Comparison of '{0}' and '{1}': {2}", 
                        s1, s2, s1.CompareTo(s2));
   }
}
// The example displays the following output:
//       Comparison of 'ani-mal' and 'animal': 0

let s1 = "ani\u00ADmal"
let s2 = "animal"

printfn $"Comparison of '{s1}' and '{s2}': {s1.CompareTo s2}"
// The example displays the following output:
//       Comparison of 'ani-mal' and 'animal': 0

Module Example
   Public Sub Main()
      Dim s1 As String = "ani" + ChrW(&h00AD) + "mal"
      Dim s2 As String = "animal"
      
      Console.WriteLine("Comparison of '{0}' and '{1}': {2}", 
                        s1, s2, s1.CompareTo(s2))
  End Sub
End Module
' The example displays the following output:
'       Comparison of 'ani-mal' and 'animal': 0

Om du vill känna igen okunniga tecken i en strängjämförelse anropar du CompareOrdinal(String, String) metoden.

Se även

Gäller för