Enumerable.ToDictionary Method

Definition

Overloads

ToDictionary<TSource,TKey,TElement>(IEnumerable<TSource>, Func<TSource,TKey>, Func<TSource,TElement>)

지정된 키 선택기와 요소 선택기 함수에 따라 Dictionary<TKey,TValue>을 사용하여 IEnumerable<T>를 만듭니다.Creates a Dictionary<TKey,TValue> from an IEnumerable<T> according to specified key selector and element selector functions.

ToDictionary<TSource,TKey,TElement>(IEnumerable<TSource>, Func<TSource,TKey>, Func<TSource,TElement>, IEqualityComparer<TKey>)

지정된 키 선택기 함수, 비교자 및 요소 선택기 함수에 따라 Dictionary<TKey,TValue>을 사용하여 IEnumerable<T>를 만듭니다.Creates a Dictionary<TKey,TValue> from an IEnumerable<T> according to a specified key selector function, a comparer, and an element selector function.

ToDictionary<TSource,TKey>(IEnumerable<TSource>, Func<TSource,TKey>)

지정된 키 선택기 함수에 따라 Dictionary<TKey,TValue>을 사용하여 IEnumerable<T>를 만듭니다.Creates a Dictionary<TKey,TValue> from an IEnumerable<T> according to a specified key selector function.

ToDictionary<TSource,TKey>(IEnumerable<TSource>, Func<TSource,TKey>, IEqualityComparer<TKey>)

지정된 키 선택기 함수와 키 비교자에 따라 Dictionary<TKey,TValue>을 사용하여 IEnumerable<T>를 만듭니다.Creates a Dictionary<TKey,TValue> from an IEnumerable<T> according to a specified key selector function and key comparer.

ToDictionary<TSource,TKey,TElement>(IEnumerable<TSource>, Func<TSource,TKey>, Func<TSource,TElement>)

지정된 키 선택기와 요소 선택기 함수에 따라 Dictionary<TKey,TValue>을 사용하여 IEnumerable<T>를 만듭니다.Creates a Dictionary<TKey,TValue> from an IEnumerable<T> according to specified key selector and element selector functions.

public:
generic <typename TSource, typename TKey, typename TElement>
[System::Runtime::CompilerServices::Extension]
 static System::Collections::Generic::Dictionary<TKey, TElement> ^ ToDictionary(System::Collections::Generic::IEnumerable<TSource> ^ source, Func<TSource, TKey> ^ keySelector, Func<TSource, TElement> ^ elementSelector);
public static System.Collections.Generic.Dictionary<TKey,TElement> ToDictionary<TSource,TKey,TElement> (this System.Collections.Generic.IEnumerable<TSource> source, Func<TSource,TKey> keySelector, Func<TSource,TElement> elementSelector);
static member ToDictionary : seq<'Source> * Func<'Source, 'Key> * Func<'Source, 'Element> -> System.Collections.Generic.Dictionary<'Key, 'Element>
<Extension()>
Public Function ToDictionary(Of TSource, TKey, TElement) (source As IEnumerable(Of TSource), keySelector As Func(Of TSource, TKey), elementSelector As Func(Of TSource, TElement)) As Dictionary(Of TKey, TElement)

Type Parameters

TSource

source 요소의 형식입니다.The type of the elements of source.

TKey

keySelector에서 반환하는 키의 형식입니다.The type of the key returned by keySelector.

TElement

elementSelector에서 반환하는 값의 형식입니다.The type of the value returned by elementSelector.

Parameters

source
IEnumerable<TSource>

Dictionary<TKey,TValue>을 만들기 위한 IEnumerable<T>입니다.An IEnumerable<T> to create a Dictionary<TKey,TValue> from.

keySelector
Func<TSource,TKey>

각 요소에서 키를 추출하는 함수입니다.A function to extract a key from each element.

elementSelector
Func<TSource,TElement>

각 요소를 사용하여 결과 요소 값을 생성할 변형 함수입니다.A transform function to produce a result element value from each element.

Returns

Dictionary<TKey,TElement>

입력 시퀀스에서 선택한 TElement 형식 값이 포함된 Dictionary<TKey,TValue>입니다.A Dictionary<TKey,TValue> that contains values of type TElement selected from the input sequence.

Exceptions

source, keySelector 또는 elementSelectornull인 경우source or keySelector or elementSelector is null.

-또는--or- keySelector가 생성하는 키가 null인 경우keySelector produces a key that is null.

keySelector가 두 요소에 대해 중복된 키를 생성하는 경우keySelector produces duplicate keys for two elements.

Remarks

ToDictionary<TSource,TKey,TElement>(IEnumerable<TSource>, Func<TSource,TKey>, Func<TSource,TElement>) 메서드는 기본 같음 비교자 Default를 사용 하 여 키를 비교 합니다.The ToDictionary<TSource,TKey,TElement>(IEnumerable<TSource>, Func<TSource,TKey>, Func<TSource,TElement>) method uses the default equality comparer Default to compare keys.

ToDictionary<TSource,TKey,TElement>(IEnumerable<TSource>, Func<TSource,TKey>, Func<TSource,TElement>, IEqualityComparer<TKey>)

지정된 키 선택기 함수, 비교자 및 요소 선택기 함수에 따라 Dictionary<TKey,TValue>을 사용하여 IEnumerable<T>를 만듭니다.Creates a Dictionary<TKey,TValue> from an IEnumerable<T> according to a specified key selector function, a comparer, and an element selector function.

public:
generic <typename TSource, typename TKey, typename TElement>
[System::Runtime::CompilerServices::Extension]
 static System::Collections::Generic::Dictionary<TKey, TElement> ^ ToDictionary(System::Collections::Generic::IEnumerable<TSource> ^ source, Func<TSource, TKey> ^ keySelector, Func<TSource, TElement> ^ elementSelector, System::Collections::Generic::IEqualityComparer<TKey> ^ comparer);
public static System.Collections.Generic.Dictionary<TKey,TElement> ToDictionary<TSource,TKey,TElement> (this System.Collections.Generic.IEnumerable<TSource> source, Func<TSource,TKey> keySelector, Func<TSource,TElement> elementSelector, System.Collections.Generic.IEqualityComparer<TKey> comparer);
static member ToDictionary : seq<'Source> * Func<'Source, 'Key> * Func<'Source, 'Element> * System.Collections.Generic.IEqualityComparer<'Key> -> System.Collections.Generic.Dictionary<'Key, 'Element>
<Extension()>
Public Function ToDictionary(Of TSource, TKey, TElement) (source As IEnumerable(Of TSource), keySelector As Func(Of TSource, TKey), elementSelector As Func(Of TSource, TElement), comparer As IEqualityComparer(Of TKey)) As Dictionary(Of TKey, TElement)

Type Parameters

TSource

source 요소의 형식입니다.The type of the elements of source.

TKey

keySelector에서 반환하는 키의 형식입니다.The type of the key returned by keySelector.

TElement

elementSelector에서 반환하는 값의 형식입니다.The type of the value returned by elementSelector.

Parameters

source
IEnumerable<TSource>

Dictionary<TKey,TValue>을 만들기 위한 IEnumerable<T>입니다.An IEnumerable<T> to create a Dictionary<TKey,TValue> from.

keySelector
Func<TSource,TKey>

각 요소에서 키를 추출하는 함수입니다.A function to extract a key from each element.

elementSelector
Func<TSource,TElement>

각 요소를 사용하여 결과 요소 값을 생성할 변형 함수입니다.A transform function to produce a result element value from each element.

comparer
IEqualityComparer<TKey>

키를 비교할 IEqualityComparer<T>입니다.An IEqualityComparer<T> to compare keys.

Returns

Dictionary<TKey,TElement>

입력 시퀀스에서 선택한 TElement 형식 값이 포함된 Dictionary<TKey,TValue>입니다.A Dictionary<TKey,TValue> that contains values of type TElement selected from the input sequence.

Exceptions

source, keySelector 또는 elementSelectornull인 경우source or keySelector or elementSelector is null.

-또는--or- keySelector가 생성하는 키가 null인 경우keySelector produces a key that is null.

keySelector가 두 요소에 대해 중복된 키를 생성하는 경우keySelector produces duplicate keys for two elements.

Remarks

comparer null되는 경우 기본 같음 비교자 Default를 사용 하 여 키를 비교 합니다.If comparer is null, the default equality comparer Default is used to compare keys.

ToDictionary<TSource,TKey>(IEnumerable<TSource>, Func<TSource,TKey>)

지정된 키 선택기 함수에 따라 Dictionary<TKey,TValue>을 사용하여 IEnumerable<T>를 만듭니다.Creates a Dictionary<TKey,TValue> from an IEnumerable<T> according to a specified key selector function.

public:
generic <typename TSource, typename TKey>
[System::Runtime::CompilerServices::Extension]
 static System::Collections::Generic::Dictionary<TKey, TSource> ^ ToDictionary(System::Collections::Generic::IEnumerable<TSource> ^ source, Func<TSource, TKey> ^ keySelector);
public static System.Collections.Generic.Dictionary<TKey,TSource> ToDictionary<TSource,TKey> (this System.Collections.Generic.IEnumerable<TSource> source, Func<TSource,TKey> keySelector);
static member ToDictionary : seq<'Source> * Func<'Source, 'Key> -> System.Collections.Generic.Dictionary<'Key, 'Source>
<Extension()>
Public Function ToDictionary(Of TSource, TKey) (source As IEnumerable(Of TSource), keySelector As Func(Of TSource, TKey)) As Dictionary(Of TKey, TSource)

Type Parameters

TSource

source 요소의 형식입니다.The type of the elements of source.

TKey

keySelector에서 반환하는 키의 형식입니다.The type of the key returned by keySelector.

Parameters

source
IEnumerable<TSource>

Dictionary<TKey,TValue>을 만들기 위한 IEnumerable<T>입니다.An IEnumerable<T> to create a Dictionary<TKey,TValue> from.

keySelector
Func<TSource,TKey>

각 요소에서 키를 추출하는 함수입니다.A function to extract a key from each element.

Returns

Dictionary<TKey,TSource>

키와 값이 들어 있는 Dictionary<TKey,TValue>입니다.A Dictionary<TKey,TValue> that contains keys and values. 각 그룹의 값은 source의 순서와 동일합니다.The values within each group are in the same order as in source.

Exceptions

source 또는 keySelectornull인 경우source or keySelector is null.

-또는--or- keySelector가 생성하는 키가 null인 경우keySelector produces a key that is null.

keySelector가 두 요소에 대해 중복된 키를 생성하는 경우keySelector produces duplicate keys for two elements.

Examples

다음 코드 예제에서는 키 선택기를 사용 하 여 Dictionary<TKey,TValue>을 만드는 ToDictionary<TSource,TKey>(IEnumerable<TSource>, Func<TSource,TKey>)를 사용 하는 방법을 보여 줍니다.The following code example demonstrates how to use ToDictionary<TSource,TKey>(IEnumerable<TSource>, Func<TSource,TKey>) to create a Dictionary<TKey,TValue> by using a key selector.

class Package
{
    public string Company { get; set; }
    public double Weight { get; set; }
    public long TrackingNumber { get; set; }
}

public static void ToDictionaryEx1()
{
    List<Package> packages =
        new List<Package>
            { new Package { Company = "Coho Vineyard", Weight = 25.2, TrackingNumber = 89453312L },
              new Package { Company = "Lucerne Publishing", Weight = 18.7, TrackingNumber = 89112755L },
              new Package { Company = "Wingtip Toys", Weight = 6.0, TrackingNumber = 299456122L },
              new Package { Company = "Adventure Works", Weight = 33.8, TrackingNumber = 4665518773L } };

    // Create a Dictionary of Package objects,
    // using TrackingNumber as the key.
    Dictionary<long, Package> dictionary =
        packages.ToDictionary(p => p.TrackingNumber);

    foreach (KeyValuePair<long, Package> kvp in dictionary)
    {
        Console.WriteLine(
            "Key {0}: {1}, {2} pounds",
            kvp.Key,
            kvp.Value.Company,
            kvp.Value.Weight);
    }
}

/*
 This code produces the following output:

 Key 89453312: Coho Vineyard, 25.2 pounds
 Key 89112755: Lucerne Publishing, 18.7 pounds
 Key 299456122: Wingtip Toys, 6 pounds
 Key 4665518773: Adventure Works, 33.8 pounds
*/
Structure Package
    Public Company As String
    Public Weight As Double
    Public TrackingNumber As Long
End Structure

Sub ToDictionaryEx1()
    ' Create a list of Package values.
    Dim packages As New List(Of Package)(New Package() _
     {New Package With
      {.Company = "Coho Vineyard", .Weight = 25.2, .TrackingNumber = 89453312L},
      New Package With
      {.Company = "Lucerne Publishing", .Weight = 18.7, .TrackingNumber = 89112755L},
      New Package With
      {.Company = "Wingtip Toys", .Weight = 6.0, .TrackingNumber = 299456122L},
      New Package With
      {.Company = "Adventure Works", .Weight = 33.8, .TrackingNumber = 4665518773L}})

    ' Create a Dictionary that contains Package values, 
    ' using TrackingNumber as the key.
    Dim dict As Dictionary(Of Long, Package) =
    packages.ToDictionary(Function(p) p.TrackingNumber)

    ' Display the results.
    Dim output As New System.Text.StringBuilder
    For Each kvp As KeyValuePair(Of Long, Package) In dict
        output.AppendLine("Key " & kvp.Key & ": " &
                      kvp.Value.Company & ", " &
                      kvp.Value.Weight & " pounds")
    Next
    Console.WriteLine(output.ToString())
End Sub

' This code produces the following output:
'
' Key 89453312: Coho Vineyard, 25.2 pounds
' Key 89112755: Lucerne Publishing, 18.7 pounds
' Key 299456122: Wingtip Toys, 6 pounds
' Key 4665518773: Adventure Works, 33.8 pounds

Remarks

ToDictionary<TSource,TKey>(IEnumerable<TSource>, Func<TSource,TKey>) 메서드는 기본 같음 비교자 Default를 사용 하 여 키를 비교 합니다.The ToDictionary<TSource,TKey>(IEnumerable<TSource>, Func<TSource,TKey>) method uses the default equality comparer Default to compare keys.

ToDictionary<TSource,TKey>(IEnumerable<TSource>, Func<TSource,TKey>, IEqualityComparer<TKey>)

지정된 키 선택기 함수와 키 비교자에 따라 Dictionary<TKey,TValue>을 사용하여 IEnumerable<T>를 만듭니다.Creates a Dictionary<TKey,TValue> from an IEnumerable<T> according to a specified key selector function and key comparer.

public:
generic <typename TSource, typename TKey>
[System::Runtime::CompilerServices::Extension]
 static System::Collections::Generic::Dictionary<TKey, TSource> ^ ToDictionary(System::Collections::Generic::IEnumerable<TSource> ^ source, Func<TSource, TKey> ^ keySelector, System::Collections::Generic::IEqualityComparer<TKey> ^ comparer);
public static System.Collections.Generic.Dictionary<TKey,TSource> ToDictionary<TSource,TKey> (this System.Collections.Generic.IEnumerable<TSource> source, Func<TSource,TKey> keySelector, System.Collections.Generic.IEqualityComparer<TKey> comparer);
static member ToDictionary : seq<'Source> * Func<'Source, 'Key> * System.Collections.Generic.IEqualityComparer<'Key> -> System.Collections.Generic.Dictionary<'Key, 'Source>
<Extension()>
Public Function ToDictionary(Of TSource, TKey) (source As IEnumerable(Of TSource), keySelector As Func(Of TSource, TKey), comparer As IEqualityComparer(Of TKey)) As Dictionary(Of TKey, TSource)

Type Parameters

TSource

source 요소의 형식입니다.The type of the elements of source.

TKey

keySelector에서 반환하는 키의 형식입니다.The type of the keys returned by keySelector.

Parameters

source
IEnumerable<TSource>

Dictionary<TKey,TValue>을 만들기 위한 IEnumerable<T>입니다.An IEnumerable<T> to create a Dictionary<TKey,TValue> from.

keySelector
Func<TSource,TKey>

각 요소에서 키를 추출하는 함수입니다.A function to extract a key from each element.

comparer
IEqualityComparer<TKey>

키를 비교할 IEqualityComparer<T>입니다.An IEqualityComparer<T> to compare keys.

Returns

Dictionary<TKey,TSource>

키와 값이 들어 있는 Dictionary<TKey,TValue>입니다.A Dictionary<TKey,TValue> that contains keys and values. 각 그룹의 값은 source의 순서와 동일합니다.The values within each group are in the same order as in source.

Exceptions

source 또는 keySelectornull인 경우source or keySelector is null.

-또는--or- keySelector가 생성하는 키가 null인 경우keySelector produces a key that is null.

keySelector가 두 요소에 대해 중복된 키를 생성하는 경우keySelector produces duplicate keys for two elements.

Remarks

comparer null되는 경우 기본 같음 비교자 Default를 사용 하 여 키를 비교 합니다.If comparer is null, the default equality comparer Default is used to compare keys.

Applies to