ArrayList.IndexOf Metoda

Definice

Obor názvů:: System.Collections

Sestavení:: mscorlib.dll, System.Collections.NonGeneric.dll

Sestavení:: netstandard.dll, System.Runtime.dll

Sestavení:: System.Collections.NonGeneric.dll

Sestavení:: System.Runtime.Extensions.dll

Sestavení:: mscorlib.dll

Sestavení:: netstandard.dll

Důležité

Některé informace platí pro předběžně vydaný produkt, který se může zásadně změnit, než ho výrobce nebo autor vydá. Microsoft neposkytuje žádné záruky, výslovné ani předpokládané, týkající se zde uváděných informací.

Vrátí index založený na nule prvního výskytu hodnoty v ArrayList nebo jeho části.

Přetížení

Name	Description
IndexOf(Object)	Vyhledá zadaný Object index a vrátí index založený na nule prvního výskytu v celém ArrayListrozsahu .
IndexOf(Object, Int32)	Vyhledá zadaný Object index a vrátí index založený na nule prvního výskytu v rozsahu prvků v ArrayList objektu, který se rozšiřuje ze zadaného indexu na poslední prvek.
IndexOf(Object, Int32, Int32)	Vyhledá zadaný Object index a vrátí index založený na nule prvního výskytu v rozsahu prvků, ArrayList který začíná na zadaném indexu a obsahuje zadaný počet prvků.

IndexOf(Object)

Zdroj:: ArrayList.cs

Zdroj:: ArrayList.cs

Zdroj:: ArrayList.cs

Zdroj:: ArrayList.cs

Zdroj:: ArrayList.cs

Vyhledá zadaný Object index a vrátí index založený na nule prvního výskytu v celém ArrayListrozsahu .

public:
 virtual int IndexOf(System::Object ^ value);

public virtual int IndexOf(object value);

public virtual int IndexOf(object? value);

abstract member IndexOf : obj -> int
override this.IndexOf : obj -> int

Public Overridable Function IndexOf (value As Object) As Integer

Parametry

value: Object

The Object to locate in the ArrayList. Hodnota může být null.

Návraty

Int32

Index založený na nule prvního výskytu value v celém ArrayListobjektu , pokud je nalezen; v opačném případě -1.

Implementuje

IndexOf(Object)

Příklady

Následující příklad kódu ukazuje, jak určit index prvního výskytu zadaného prvku.

using System;
using System.Collections;
public class SamplesArrayList
{

    public static void Main()
    {

        // Creates and initializes a new ArrayList with three elements of the same value.
        ArrayList myAL = new ArrayList();
        myAL.Add( "the" );
        myAL.Add( "quick" );
        myAL.Add( "brown" );
        myAL.Add( "fox" );
        myAL.Add( "jumps" );
        myAL.Add( "over" );
        myAL.Add( "the" );
        myAL.Add( "lazy" );
        myAL.Add( "dog" );
        myAL.Add( "in" );
        myAL.Add( "the" );
        myAL.Add( "barn" );

        // Displays the values of the ArrayList.
        Console.WriteLine( "The ArrayList contains the following values:" );
        PrintIndexAndValues( myAL );

        // Search for the first occurrence of the duplicated value.
        string myString = "the";
        int myIndex = myAL.IndexOf( myString );
        Console.WriteLine( "The first occurrence of \"{0}\" is at index {1}.", myString, myIndex );

        // Search for the first occurrence of the duplicated value in the last section of the ArrayList.
        myIndex = myAL.IndexOf( myString, 4 );
        Console.WriteLine( "The first occurrence of \"{0}\" between index 4 and the end is at index {1}.", myString, myIndex );

        // Search for the first occurrence of the duplicated value in a section of the ArrayList.
        myIndex = myAL.IndexOf( myString, 6, 6 );
        Console.WriteLine( "The first occurrence of \"{0}\" between index 6 and index 11 is at index {1}.", myString, myIndex );

        // Search for the first occurrence of the duplicated value in a small section at the end of the ArrayList.
        myIndex = myAL.IndexOf( myString, 11 );
        Console.WriteLine( "The first occurrence of \"{0}\" between index 11 and the end is at index {1}.", myString, myIndex );
    }

    public static void PrintIndexAndValues(IEnumerable myList)
    {
        int i = 0;
        foreach (Object obj in myList)
            Console.WriteLine("   [{0}]:    {1}", i++, obj);
        Console.WriteLine();
    }
}
/*
This code produces output similar to the following:

The ArrayList contains the following values:
   [0]:    the
   [1]:    quick
   [2]:    brown
   [3]:    fox
   [4]:    jumps
   [5]:    over
   [6]:    the
   [7]:    lazy
   [8]:    dog
   [9]:    in
   [10]:    the
   [11]:    barn

The first occurrence of "the" is at index 0.
The first occurrence of "the" between index 4 and the end is at index 6.
The first occurrence of "the" between index 6 and index 11 is at index 6.
The first occurrence of "the" between index 11 and the end is at index -1.
*/

Imports System.Collections

Public Class SamplesArrayList


    Public Shared Sub Main()

        ' Creates and initializes a new ArrayList with three elements of the same value.
        Dim myAL As New ArrayList()
        myAL.Add("the")
        myAL.Add("quick")
        myAL.Add("brown")
        myAL.Add("fox")
        myAL.Add("jumps")
        myAL.Add("over")
        myAL.Add("the")
        myAL.Add("lazy")
        myAL.Add("dog")
        myAL.Add("in")
        myAL.Add("the")
        myAL.Add("barn")

        ' Displays the values of the ArrayList.
        Console.WriteLine("The ArrayList contains the following values:")
        PrintIndexAndValues(myAL)

        ' Search for the first occurrence of the duplicated value.
        Dim myString As [String] = "the"
        Dim myIndex As Integer = myAL.IndexOf(myString)
        Console.WriteLine("The first occurrence of ""{0}"" is at index {1}.", myString, myIndex)

        ' Search for the first occurrence of the duplicated value in the last section of the ArrayList.
        myIndex = myAL.IndexOf(myString, 4)
        Console.WriteLine("The first occurrence of ""{0}"" between index 4 and the end is at index {1}.", myString, myIndex)

        ' Search for the first occurrence of the duplicated value in a section of the ArrayList.
        myIndex = myAL.IndexOf(myString, 6, 6)
        Console.WriteLine("The first occurrence of ""{0}"" between index 6 and index 11 is at index {1}.", myString, myIndex)

        ' Search for the first occurrence of the duplicated value in a small section at the end of the ArrayList.
        myIndex = myAL.IndexOf(myString, 11)
        Console.WriteLine("The first occurrence of ""{0}"" between index 11 and the end is at index {1}.", myString, myIndex)

    End Sub

    Public Shared Sub PrintIndexAndValues(ByVal myList As IEnumerable)
        Dim i As Integer
        Dim obj As [Object]
        For Each obj In myList
            Console.WriteLine("   [{0}]:    {1}", i, obj)
            i = i + 1
        Next obj
        Console.WriteLine()
    End Sub

End Class

' This code produces the following output.
'
' The ArrayList contains the following values:
' 	[0]:	the
' 	[1]:	quick
' 	[2]:	brown
' 	[3]:	fox
' 	[4]:	jumps
' 	[5]:	over
' 	[6]:	the
' 	[7]:	lazy
' 	[8]:	dog
' 	[9]:	in
' 	[10]:	the
' 	[11]:	barn
' 
' The first occurrence of "the" is at index 0.
' The first occurrence of "the" between index 4 and the end is at index 6.
' The first occurrence of "the" between index 6 and index 11 is at index 6.
' The first occurrence of "the" between index 11 and the end is at index -1.
'

Poznámky

Vyhledá se ArrayList dopředu počínaje prvním prvkem a končí posledním prvkem.

Tato metoda provádí lineární vyhledávání; proto je O(n) tato metoda operace, kde n je Count.

Tato metoda určuje rovnost voláním Object.Equals.

Tato metoda používá objekty Equals a CompareTo metody item kolekce k určení, zda položka existuje.

Viz také

Platí pro

IndexOf(Object, Int32)

Zdroj:: ArrayList.cs

Zdroj:: ArrayList.cs

Zdroj:: ArrayList.cs

Zdroj:: ArrayList.cs

Zdroj:: ArrayList.cs

Vyhledá zadaný Object index a vrátí index založený na nule prvního výskytu v rozsahu prvků v ArrayList objektu, který se rozšiřuje ze zadaného indexu na poslední prvek.

public:
 virtual int IndexOf(System::Object ^ value, int startIndex);

public virtual int IndexOf(object value, int startIndex);

public virtual int IndexOf(object? value, int startIndex);

abstract member IndexOf : obj * int -> int
override this.IndexOf : obj * int -> int

Public Overridable Function IndexOf (value As Object, startIndex As Integer) As Integer

Parametry

value: Object

The Object to locate in the ArrayList. Hodnota může být null.

startIndex: Int32

Počáteční index vyhledávání založený na nule. Hodnota 0 (nula) je platná v prázdném seznamu.

Návraty

Int32

Index založený na nule prvního výskytu value v rozsahu prvků v ArrayList prvku, který se vztahuje od startIndex posledního prvku, pokud je nalezen; jinak -1.

Výjimky

ArgumentOutOfRangeException

startIndex je mimo rozsah platných indexů pro ArrayList.

Příklady

Následující příklad kódu ukazuje, jak určit index prvního výskytu zadaného prvku.

using System;
using System.Collections;
public class SamplesArrayList
{

    public static void Main()
    {

        // Creates and initializes a new ArrayList with three elements of the same value.
        ArrayList myAL = new ArrayList();
        myAL.Add( "the" );
        myAL.Add( "quick" );
        myAL.Add( "brown" );
        myAL.Add( "fox" );
        myAL.Add( "jumps" );
        myAL.Add( "over" );
        myAL.Add( "the" );
        myAL.Add( "lazy" );
        myAL.Add( "dog" );
        myAL.Add( "in" );
        myAL.Add( "the" );
        myAL.Add( "barn" );

        // Displays the values of the ArrayList.
        Console.WriteLine( "The ArrayList contains the following values:" );
        PrintIndexAndValues( myAL );

        // Search for the first occurrence of the duplicated value.
        string myString = "the";
        int myIndex = myAL.IndexOf( myString );
        Console.WriteLine( "The first occurrence of \"{0}\" is at index {1}.", myString, myIndex );

        // Search for the first occurrence of the duplicated value in the last section of the ArrayList.
        myIndex = myAL.IndexOf( myString, 4 );
        Console.WriteLine( "The first occurrence of \"{0}\" between index 4 and the end is at index {1}.", myString, myIndex );

        // Search for the first occurrence of the duplicated value in a section of the ArrayList.
        myIndex = myAL.IndexOf( myString, 6, 6 );
        Console.WriteLine( "The first occurrence of \"{0}\" between index 6 and index 11 is at index {1}.", myString, myIndex );

        // Search for the first occurrence of the duplicated value in a small section at the end of the ArrayList.
        myIndex = myAL.IndexOf( myString, 11 );
        Console.WriteLine( "The first occurrence of \"{0}\" between index 11 and the end is at index {1}.", myString, myIndex );
    }

    public static void PrintIndexAndValues(IEnumerable myList)
    {
        int i = 0;
        foreach (Object obj in myList)
            Console.WriteLine("   [{0}]:    {1}", i++, obj);
        Console.WriteLine();
    }
}
/*
This code produces output similar to the following:

The ArrayList contains the following values:
   [0]:    the
   [1]:    quick
   [2]:    brown
   [3]:    fox
   [4]:    jumps
   [5]:    over
   [6]:    the
   [7]:    lazy
   [8]:    dog
   [9]:    in
   [10]:    the
   [11]:    barn

The first occurrence of "the" is at index 0.
The first occurrence of "the" between index 4 and the end is at index 6.
The first occurrence of "the" between index 6 and index 11 is at index 6.
The first occurrence of "the" between index 11 and the end is at index -1.
*/

Imports System.Collections

Public Class SamplesArrayList


    Public Shared Sub Main()

        ' Creates and initializes a new ArrayList with three elements of the same value.
        Dim myAL As New ArrayList()
        myAL.Add("the")
        myAL.Add("quick")
        myAL.Add("brown")
        myAL.Add("fox")
        myAL.Add("jumps")
        myAL.Add("over")
        myAL.Add("the")
        myAL.Add("lazy")
        myAL.Add("dog")
        myAL.Add("in")
        myAL.Add("the")
        myAL.Add("barn")

        ' Displays the values of the ArrayList.
        Console.WriteLine("The ArrayList contains the following values:")
        PrintIndexAndValues(myAL)

        ' Search for the first occurrence of the duplicated value.
        Dim myString As [String] = "the"
        Dim myIndex As Integer = myAL.IndexOf(myString)
        Console.WriteLine("The first occurrence of ""{0}"" is at index {1}.", myString, myIndex)

        ' Search for the first occurrence of the duplicated value in the last section of the ArrayList.
        myIndex = myAL.IndexOf(myString, 4)
        Console.WriteLine("The first occurrence of ""{0}"" between index 4 and the end is at index {1}.", myString, myIndex)

        ' Search for the first occurrence of the duplicated value in a section of the ArrayList.
        myIndex = myAL.IndexOf(myString, 6, 6)
        Console.WriteLine("The first occurrence of ""{0}"" between index 6 and index 11 is at index {1}.", myString, myIndex)

        ' Search for the first occurrence of the duplicated value in a small section at the end of the ArrayList.
        myIndex = myAL.IndexOf(myString, 11)
        Console.WriteLine("The first occurrence of ""{0}"" between index 11 and the end is at index {1}.", myString, myIndex)

    End Sub

    Public Shared Sub PrintIndexAndValues(ByVal myList As IEnumerable)
        Dim i As Integer
        Dim obj As [Object]
        For Each obj In myList
            Console.WriteLine("   [{0}]:    {1}", i, obj)
            i = i + 1
        Next obj
        Console.WriteLine()
    End Sub

End Class

' This code produces the following output.
'
' The ArrayList contains the following values:
' 	[0]:	the
' 	[1]:	quick
' 	[2]:	brown
' 	[3]:	fox
' 	[4]:	jumps
' 	[5]:	over
' 	[6]:	the
' 	[7]:	lazy
' 	[8]:	dog
' 	[9]:	in
' 	[10]:	the
' 	[11]:	barn
' 
' The first occurrence of "the" is at index 0.
' The first occurrence of "the" between index 4 and the end is at index 6.
' The first occurrence of "the" between index 6 and index 11 is at index 6.
' The first occurrence of "the" between index 11 and the end is at index -1.
'

Poznámky

Vyhledá se ArrayList dopředu počínaje startIndex a končí posledním prvkem.

Tato metoda provádí lineární vyhledávání; proto je O(n) tato metoda operace, kde n je počet prvků od startIndex do konce ArrayList.

Tato metoda určuje rovnost voláním Object.Equals.

Tato metoda používá objekty Equals a CompareTo metody item kolekce k určení, zda položka existuje.

Viz také

Platí pro

IndexOf(Object, Int32, Int32)

Zdroj:: ArrayList.cs

Zdroj:: ArrayList.cs

Zdroj:: ArrayList.cs

Zdroj:: ArrayList.cs

Zdroj:: ArrayList.cs

Vyhledá zadaný Object index a vrátí index založený na nule prvního výskytu v rozsahu prvků, ArrayList který začíná na zadaném indexu a obsahuje zadaný počet prvků.

public:
 virtual int IndexOf(System::Object ^ value, int startIndex, int count);

public virtual int IndexOf(object value, int startIndex, int count);

public virtual int IndexOf(object? value, int startIndex, int count);

abstract member IndexOf : obj * int * int -> int
override this.IndexOf : obj * int * int -> int

Public Overridable Function IndexOf (value As Object, startIndex As Integer, count As Integer) As Integer

Parametry

value: Object

The Object to locate in the ArrayList. Hodnota může být null.

startIndex: Int32

Počáteční index vyhledávání založený na nule. Hodnota 0 (nula) je platná v prázdném seznamu.

count: Int32

Počet prvků v oddílu, které se mají prohledávat.

Návraty

Int32

Index založený na nule prvního výskytu value v rozsahu prvků v ArrayList objektu, který začíná startIndex a obsahuje count počet prvků, pokud je nalezen; jinak -1.

Výjimky

ArgumentOutOfRangeException

startIndex je mimo rozsah platných indexů pro ArrayList.

nebo

Hodnota count je menší než nula.

nebo

startIndex a count nezadávejte platný oddíl v sekci ArrayList.

Příklady

Následující příklad kódu ukazuje, jak určit index prvního výskytu zadaného prvku.

using System;
using System.Collections;
public class SamplesArrayList
{

    public static void Main()
    {

        // Creates and initializes a new ArrayList with three elements of the same value.
        ArrayList myAL = new ArrayList();
        myAL.Add( "the" );
        myAL.Add( "quick" );
        myAL.Add( "brown" );
        myAL.Add( "fox" );
        myAL.Add( "jumps" );
        myAL.Add( "over" );
        myAL.Add( "the" );
        myAL.Add( "lazy" );
        myAL.Add( "dog" );
        myAL.Add( "in" );
        myAL.Add( "the" );
        myAL.Add( "barn" );

        // Displays the values of the ArrayList.
        Console.WriteLine( "The ArrayList contains the following values:" );
        PrintIndexAndValues( myAL );

        // Search for the first occurrence of the duplicated value.
        string myString = "the";
        int myIndex = myAL.IndexOf( myString );
        Console.WriteLine( "The first occurrence of \"{0}\" is at index {1}.", myString, myIndex );

        // Search for the first occurrence of the duplicated value in the last section of the ArrayList.
        myIndex = myAL.IndexOf( myString, 4 );
        Console.WriteLine( "The first occurrence of \"{0}\" between index 4 and the end is at index {1}.", myString, myIndex );

        // Search for the first occurrence of the duplicated value in a section of the ArrayList.
        myIndex = myAL.IndexOf( myString, 6, 6 );
        Console.WriteLine( "The first occurrence of \"{0}\" between index 6 and index 11 is at index {1}.", myString, myIndex );

        // Search for the first occurrence of the duplicated value in a small section at the end of the ArrayList.
        myIndex = myAL.IndexOf( myString, 11 );
        Console.WriteLine( "The first occurrence of \"{0}\" between index 11 and the end is at index {1}.", myString, myIndex );
    }

    public static void PrintIndexAndValues(IEnumerable myList)
    {
        int i = 0;
        foreach (Object obj in myList)
            Console.WriteLine("   [{0}]:    {1}", i++, obj);
        Console.WriteLine();
    }
}
/*
This code produces output similar to the following:

The ArrayList contains the following values:
   [0]:    the
   [1]:    quick
   [2]:    brown
   [3]:    fox
   [4]:    jumps
   [5]:    over
   [6]:    the
   [7]:    lazy
   [8]:    dog
   [9]:    in
   [10]:    the
   [11]:    barn

The first occurrence of "the" is at index 0.
The first occurrence of "the" between index 4 and the end is at index 6.
The first occurrence of "the" between index 6 and index 11 is at index 6.
The first occurrence of "the" between index 11 and the end is at index -1.
*/

Imports System.Collections

Public Class SamplesArrayList


    Public Shared Sub Main()

        ' Creates and initializes a new ArrayList with three elements of the same value.
        Dim myAL As New ArrayList()
        myAL.Add("the")
        myAL.Add("quick")
        myAL.Add("brown")
        myAL.Add("fox")
        myAL.Add("jumps")
        myAL.Add("over")
        myAL.Add("the")
        myAL.Add("lazy")
        myAL.Add("dog")
        myAL.Add("in")
        myAL.Add("the")
        myAL.Add("barn")

        ' Displays the values of the ArrayList.
        Console.WriteLine("The ArrayList contains the following values:")
        PrintIndexAndValues(myAL)

        ' Search for the first occurrence of the duplicated value.
        Dim myString As [String] = "the"
        Dim myIndex As Integer = myAL.IndexOf(myString)
        Console.WriteLine("The first occurrence of ""{0}"" is at index {1}.", myString, myIndex)

        ' Search for the first occurrence of the duplicated value in the last section of the ArrayList.
        myIndex = myAL.IndexOf(myString, 4)
        Console.WriteLine("The first occurrence of ""{0}"" between index 4 and the end is at index {1}.", myString, myIndex)

        ' Search for the first occurrence of the duplicated value in a section of the ArrayList.
        myIndex = myAL.IndexOf(myString, 6, 6)
        Console.WriteLine("The first occurrence of ""{0}"" between index 6 and index 11 is at index {1}.", myString, myIndex)

        ' Search for the first occurrence of the duplicated value in a small section at the end of the ArrayList.
        myIndex = myAL.IndexOf(myString, 11)
        Console.WriteLine("The first occurrence of ""{0}"" between index 11 and the end is at index {1}.", myString, myIndex)

    End Sub

    Public Shared Sub PrintIndexAndValues(ByVal myList As IEnumerable)
        Dim i As Integer
        Dim obj As [Object]
        For Each obj In myList
            Console.WriteLine("   [{0}]:    {1}", i, obj)
            i = i + 1
        Next obj
        Console.WriteLine()
    End Sub

End Class

' This code produces the following output.
'
' The ArrayList contains the following values:
' 	[0]:	the
' 	[1]:	quick
' 	[2]:	brown
' 	[3]:	fox
' 	[4]:	jumps
' 	[5]:	over
' 	[6]:	the
' 	[7]:	lazy
' 	[8]:	dog
' 	[9]:	in
' 	[10]:	the
' 	[11]:	barn
' 
' The first occurrence of "the" is at index 0.
' The first occurrence of "the" between index 4 and the end is at index 6.
' The first occurrence of "the" between index 6 and index 11 is at index 6.
' The first occurrence of "the" between index 11 and the end is at index -1.
'

Poznámky

Vyhledá se ArrayList dopředu počínaje startIndex a končí na startIndex plus count mínus 1, pokud count je větší než 0.

Tato metoda provádí lineární vyhledávání; proto je O(n) tato metoda operace, kde n je count.

Tato metoda určuje rovnost voláním Object.Equals.

Tato metoda používá objekty Equals a CompareTo metody item kolekce k určení, zda položka existuje.

Viz také

Platí pro

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