HashSet<T> 類別
定義
重要
部分資訊涉及發行前產品，在發行之前可能會有大幅修改。 Microsoft 對此處提供的資訊，不做任何明確或隱含的瑕疵擔保。
表示一組值。
generic <typename T>
public ref class HashSet : System::Collections::Generic::ICollection<T>, System::Collections::Generic::IEnumerable<T>, System::Collections::Generic::IReadOnlyCollection<T>, System::Collections::Generic::ISet<T>generic <typename T>
public ref class HashSet : System::Collections::Generic::ICollection<T>, System::Collections::Generic::IEnumerable<T>, System::Collections::Generic::IReadOnlyCollection<T>, System::Collections::Generic::IReadOnlySet<T>, System::Collections::Generic::ISet<T>, System::Runtime::Serialization::IDeserializationCallback, System::Runtime::Serialization::ISerializablegeneric <typename T>
public ref class HashSet : System::Collections::Generic::ICollection<T>, System::Collections::Generic::IEnumerable<T>, System::Collections::Generic::IReadOnlyCollection<T>, System::Collections::Generic::ISet<T>, System::Runtime::Serialization::IDeserializationCallback, System::Runtime::Serialization::ISerializablegeneric <typename T>
public ref class HashSet : System::Collections::Generic::ICollection<T>, System::Collections::Generic::IEnumerable<T>, System::Runtime::Serialization::IDeserializationCallback, System::Runtime::Serialization::ISerializablegeneric <typename T>
public ref class HashSet : System::Collections::Generic::ICollection<T>, System::Collections::Generic::IEnumerable<T>, System::Collections::Generic::ISet<T>, System::Runtime::Serialization::IDeserializationCallback, System::Runtime::Serialization::ISerializablegeneric <typename T>
public ref class HashSet : System::Collections::Generic::ICollection<T>, System::Collections::Generic::IEnumerable<T>, System::Collections::Generic::ISet<T>public class HashSet<T> : System.Collections.Generic.ICollection<T>, System.Collections.Generic.IEnumerable<T>, System.Collections.Generic.IReadOnlyCollection<T>, System.Collections.Generic.ISet<T>public class HashSet<T> : System.Collections.Generic.ICollection<T>, System.Collections.Generic.IEnumerable<T>, System.Collections.Generic.IReadOnlyCollection<T>, System.Collections.Generic.IReadOnlySet<T>, System.Collections.Generic.ISet<T>, System.Runtime.Serialization.IDeserializationCallback, System.Runtime.Serialization.ISerializablepublic class HashSet<T> : System.Collections.Generic.ICollection<T>, System.Collections.Generic.IEnumerable<T>, System.Collections.Generic.IReadOnlyCollection<T>, System.Collections.Generic.ISet<T>, System.Runtime.Serialization.IDeserializationCallback, System.Runtime.Serialization.ISerializable[System.Serializable]
public class HashSet<T> : System.Collections.Generic.ICollection<T>, System.Collections.Generic.IEnumerable<T>, System.Runtime.Serialization.IDeserializationCallback, System.Runtime.Serialization.ISerializable[System.Serializable]
public class HashSet<T> : System.Collections.Generic.ICollection<T>, System.Collections.Generic.IEnumerable<T>, System.Collections.Generic.ISet<T>, System.Runtime.Serialization.IDeserializationCallback, System.Runtime.Serialization.ISerializable[System.Serializable]
public class HashSet<T> : System.Collections.Generic.ICollection<T>, System.Collections.Generic.IEnumerable<T>, System.Collections.Generic.IReadOnlyCollection<T>, System.Collections.Generic.ISet<T>, System.Runtime.Serialization.IDeserializationCallback, System.Runtime.Serialization.ISerializablepublic class HashSet<T> : System.Collections.Generic.ICollection<T>, System.Collections.Generic.IEnumerable<T>, System.Collections.Generic.ISet<T>type HashSet<'T> = class
interface ICollection<'T>
interface seq<'T>
interface IEnumerable
interface IReadOnlyCollection<'T>
interface ISet<'T>type HashSet<'T> = class
interface ICollection<'T>
interface seq<'T>
interface IEnumerable
interface IReadOnlyCollection<'T>
interface ISet<'T>
interface IReadOnlySet<'T>
interface IDeserializationCallback
interface ISerializabletype HashSet<'T> = class
interface ICollection<'T>
interface seq<'T>
interface IEnumerable
interface IReadOnlyCollection<'T>
interface ISet<'T>
interface IDeserializationCallback
interface ISerializable[<System.Serializable>]
type HashSet<'T> = class
interface ICollection<'T>
interface seq<'T>
interface IEnumerable
interface ISerializable
interface IDeserializationCallback[<System.Serializable>]
type HashSet<'T> = class
interface ISerializable
interface IDeserializationCallback
interface ISet<'T>
interface ICollection<'T>
interface seq<'T>
interface IEnumerable[<System.Serializable>]
type HashSet<'T> = class
interface ICollection<'T>
interface seq<'T>
interface IEnumerable
interface ISerializable
interface IDeserializationCallback
interface ISet<'T>
interface IReadOnlyCollection<'T>type HashSet<'T> = class
interface ISet<'T>
interface ICollection<'T>
interface seq<'T>
interface IEnumerablePublic Class HashSet(Of T)
Implements ICollection(Of T), IEnumerable(Of T), IReadOnlyCollection(Of T), ISet(Of T)Public Class HashSet(Of T)
Implements ICollection(Of T), IDeserializationCallback, IEnumerable(Of T), IReadOnlyCollection(Of T), IReadOnlySet(Of T), ISerializable, ISet(Of T)Public Class HashSet(Of T)
Implements ICollection(Of T), IDeserializationCallback, IEnumerable(Of T), IReadOnlyCollection(Of T), ISerializable, ISet(Of T)Public Class HashSet(Of T)
Implements ICollection(Of T), IDeserializationCallback, IEnumerable(Of T), ISerializablePublic Class HashSet(Of T)
Implements ICollection(Of T), IDeserializationCallback, IEnumerable(Of T), ISerializable, ISet(Of T)Public Class HashSet(Of T)
Implements ICollection(Of T), IEnumerable(Of T), ISet(Of T)類型參數
- T
哈希集中的項目類型。
- 繼承
-
HashSet<T>
- 屬性
- 實作
範例
下列範例示範如何合併兩個不同的集合。 此範例會建立兩個 HashSet<T> 物件，並分別填入偶數和奇數。 第三個 HashSet<T> 對像是從包含偶數的集合建立。 然後，此範例會呼叫 UnionWith 方法，此方法會將奇數集合新增至第三個集合。
HashSet<int> evenNumbers = new HashSet<int>();
HashSet<int> oddNumbers = new HashSet<int>();
for (int i = 0; i < 5; i++)
{
// Populate numbers with just even numbers.
evenNumbers.Add(i * 2);
// Populate oddNumbers with just odd numbers.
oddNumbers.Add((i * 2) + 1);
}
Console.Write("evenNumbers contains {0} elements: ", evenNumbers.Count);
DisplaySet(evenNumbers);
Console.Write("oddNumbers contains {0} elements: ", oddNumbers.Count);
DisplaySet(oddNumbers);
// Create a new HashSet populated with even numbers.
HashSet<int> numbers = new HashSet<int>(evenNumbers);
Console.WriteLine("numbers UnionWith oddNumbers...");
numbers.UnionWith(oddNumbers);
Console.Write("numbers contains {0} elements: ", numbers.Count);
DisplaySet(numbers);
void DisplaySet(HashSet<int> collection)
{
Console.Write("{");
foreach (int i in collection)
{
Console.Write(" {0}", i);
}
Console.WriteLine(" }");
}
/* This example produces output similar to the following:
* evenNumbers contains 5 elements: { 0 2 4 6 8 }
* oddNumbers contains 5 elements: { 1 3 5 7 9 }
* numbers UnionWith oddNumbers...
* numbers contains 10 elements: { 0 2 4 6 8 1 3 5 7 9 }
*/
let displaySet (collection: HashSet<int>) =
printf "{"
for i in collection do
printf $" {i}"
printfn " }"
let evenNumbers = HashSet<int>()
let oddNumbers = HashSet<int>()
for i = 0 to 4 do
// Populate numbers with just even numbers.
evenNumbers.Add(i * 2) |> ignore
// Populate oddNumbers with just odd numbers.
oddNumbers.Add(i * 2 + 1) |> ignore
printf $"evenNumbers contains {evenNumbers.Count} elements: "
displaySet evenNumbers
printf $"oddNumbers contains {oddNumbers.Count} elements: "
displaySet oddNumbers
// Create a new HashSet populated with even numbers.
let numbers = HashSet<int> evenNumbers
printfn "numbers UnionWith oddNumbers..."
numbers.UnionWith oddNumbers
printf $"numbers contains {numbers.Count} elements: "
displaySet numbers
// This example produces output similar to the following:
// evenNumbers contains 5 elements: { 0 2 4 6 8 }
// oddNumbers contains 5 elements: { 1 3 5 7 9 }
// numbers UnionWith oddNumbers...
// numbers contains 10 elements: { 0 2 4 6 8 1 3 5 7 9 }
Imports System.Collections.Generic
Class Program
Shared Sub Main()
Dim evenNumbers As HashSet(Of Integer) = New HashSet(Of Integer)()
Dim oddNumbers As HashSet(Of Integer) = New HashSet(Of Integer)()
For i As Integer = 0 To 4
' Populate evenNumbers with only even numbers.
evenNumbers.Add(i * 2)
' Populate oddNumbers with only odd numbers.
oddNumbers.Add((i * 2) + 1)
Next i
Console.Write("evenNumbers contains {0} elements: ", evenNumbers.Count)
DisplaySet(evenNumbers)
Console.Write("oddNumbers contains {0} elements: ", oddNumbers.Count)
DisplaySet(oddNumbers)
' Create a new HashSet populated with even numbers.
Dim numbers As HashSet(Of Integer) = New HashSet(Of Integer)(evenNumbers)
Console.WriteLine("numbers UnionWith oddNumbers...")
numbers.UnionWith(oddNumbers)
Console.Write("numbers contains {0} elements: ", numbers.Count)
DisplaySet(numbers)
End Sub
Private Shared Sub DisplaySet(ByVal collection As HashSet(Of Integer))
Console.Write("{")
For Each i As Integer In collection
Console.Write(" {0}", i)
Next i
Console.WriteLine(" }")
End Sub
End Class
' This example produces output similar to the following:
' evenNumbers contains 5 elements: { 0 2 4 6 8 }
' oddNumbers contains 5 elements: { 1 3 5 7 9 }
' numbers UnionWith oddNumbers...
' numbers contains 10 elements: { 0 2 4 6 8 1 3 5 7 9 }
備註
如需此 API 的詳細資訊，請參閱 HashSet<T>的補充 API 備註。
建構函式
| HashSet<T>() |
初始化空的 HashSet<T> 類別的新實例，並使用集合型別的預設相等比較子。 |
| HashSet<T>(IEnumerable<T>) |
初始化 HashSet<T> 類別的新實例，這個實例會使用集合型別的預設相等比較子、包含從指定集合複製的元素，而且有足夠的容量來容納複製的項目數目。 |
| HashSet<T>(IEnumerable<T>, IEqualityComparer<T>) |
初始化 HashSet<T> 類別的新實例，這個實例會使用集合類型的指定相等比較子、包含從指定集合複製的元素，而且有足夠的容量容納複製的項目數目。 |
| HashSet<T>(IEqualityComparer<T>) |
初始化空的 HashSet<T> 類別的新實例，並使用集合型別的指定相等比較子。 |
| HashSet<T>(Int32) |
初始化空 HashSet<T> 類別的新實例，但已保留 |
| HashSet<T>(Int32, IEqualityComparer<T>) |
初始化 HashSet<T> 類別的新實例，這個實例會使用集合型別的指定相等比較子，而且有足夠的容量來容納 |
| HashSet<T>(SerializationInfo, StreamingContext) |
已淘汰.
使用串行化數據，初始化 HashSet<T> 類別的新實例。 |
屬性
| Capacity |
取得內部數據結構可以保留而不重設大小的元素總數。 |
| Comparer |
取得用來判斷集合中值相等的 IEqualityComparer<T> 物件。 |
| Count |
取得集合中包含的項目數目。 |
方法
明確介面實作
| ICollection<T>.Add(T) |
將專案加入至 ICollection<T> 物件。 |
| ICollection<T>.IsReadOnly |
取得值，指出集合是否為唯讀。 |
| IEnumerable.GetEnumerator() |
傳回逐一查看集合的列舉值。 |
| IEnumerable<T>.GetEnumerator() |
傳回逐一查看集合的列舉值。 |
