# HashSet<T>.IsSupersetOf(IEnumerable<T>) メソッド

## 定義

HashSet<T> オブジェクトが、指定されたコレクションのスーパーセットであるかどうかを判断します。

``````public:
virtual bool IsSupersetOf(System::Collections::Generic::IEnumerable<T> ^ other);``````
``````public:
bool IsSupersetOf(System::Collections::Generic::IEnumerable<T> ^ other);``````
``public bool IsSupersetOf (System.Collections.Generic.IEnumerable<T> other);``
``````abstract member IsSupersetOf : seq<'T> -> bool
override this.IsSupersetOf : seq<'T> -> bool``````
``member this.IsSupersetOf : seq<'T> -> bool``
``Public Function IsSupersetOf (other As IEnumerable(Of T)) As Boolean``

other
IEnumerable<T>

#### 戻り値

Boolean

HashSet<T> オブジェクトが `other` のスーパーセットである場合は `true`。それ以外の場合は `false`

#### 例外

`other``null`です。

## 例

``````HashSet<int> lowNumbers = new HashSet<int>();
HashSet<int> allNumbers = new HashSet<int>();

for (int i = 1; i < 5; i++)
{
}

for (int i = 0; i < 10; i++)
{
}

Console.Write("lowNumbers contains {0} elements: ", lowNumbers.Count);
DisplaySet(lowNumbers);

Console.Write("allNumbers contains {0} elements: ", allNumbers.Count);
DisplaySet(allNumbers);

Console.WriteLine("lowNumbers overlaps allNumbers: {0}",
lowNumbers.Overlaps(allNumbers));

Console.WriteLine("allNumbers and lowNumbers are equal sets: {0}",
allNumbers.SetEquals(lowNumbers));

// Show the results of sub/superset testing
Console.WriteLine("lowNumbers is a subset of allNumbers: {0}",
lowNumbers.IsSubsetOf(allNumbers));
Console.WriteLine("allNumbers is a superset of lowNumbers: {0}",
allNumbers.IsSupersetOf(lowNumbers));
Console.WriteLine("lowNumbers is a proper subset of allNumbers: {0}",
lowNumbers.IsProperSubsetOf(allNumbers));
Console.WriteLine("allNumbers is a proper superset of lowNumbers: {0}",
allNumbers.IsProperSupersetOf(lowNumbers));

// Modify allNumbers to remove numbers that are not in lowNumbers.
allNumbers.IntersectWith(lowNumbers);
Console.Write("allNumbers contains {0} elements: ", allNumbers.Count);
DisplaySet(allNumbers);

Console.WriteLine("allNumbers and lowNumbers are equal sets: {0}",
allNumbers.SetEquals(lowNumbers));

// Show the results of sub/superset testing with the modified set.
Console.WriteLine("lowNumbers is a subset of allNumbers: {0}",
lowNumbers.IsSubsetOf(allNumbers));
Console.WriteLine("allNumbers is a superset of lowNumbers: {0}",
allNumbers.IsSupersetOf(lowNumbers));
Console.WriteLine("lowNumbers is a proper subset of allNumbers: {0}",
lowNumbers.IsProperSubsetOf(allNumbers));
Console.WriteLine("allNumbers is a proper superset of lowNumbers: {0}",
allNumbers.IsProperSupersetOf(lowNumbers));

void DisplaySet(HashSet<int> set)
{
Console.Write("{");
foreach (int i in set)
{
Console.Write(" {0}", i);
}
Console.WriteLine(" }");
}

/* This code example produces output similar to the following:
* lowNumbers contains 4 elements: { 1 2 3 4 }
* allNumbers contains 10 elements: { 0 1 2 3 4 5 6 7 8 9 }
* lowNumbers overlaps allNumbers: True
* allNumbers and lowNumbers are equal sets: False
* lowNumbers is a subset of allNumbers: True
* allNumbers is a superset of lowNumbers: True
* lowNumbers is a proper subset of allNumbers: True
* allNumbers is a proper superset of lowNumbers: True
* allNumbers contains 4 elements: { 1 2 3 4 }
* allNumbers and lowNumbers are equal sets: True
* lowNumbers is a subset of allNumbers: True
* allNumbers is a superset of lowNumbers: True
* lowNumbers is a proper subset of allNumbers: False
* allNumbers is a proper superset of lowNumbers: False
*/
``````
``````Shared Sub Main()

Dim lowNumbers As HashSet(Of Integer) = New HashSet(Of Integer)()
Dim allNumbers As HashSet(Of Integer) = New HashSet(Of Integer)()

For i As Integer = 1 To 4
Next i

For i As Integer = 0 To 9
Next i

Console.Write("lowNumbers contains {0} elements: ", lowNumbers.Count)
DisplaySet(lowNumbers)

Console.Write("allNumbers contains {0} elements: ", allNumbers.Count)
DisplaySet(allNumbers)

Console.WriteLine("lowNumbers overlaps allNumbers: {0}", _
lowNumbers.Overlaps(allNumbers))

Console.WriteLine("allNumbers and lowNumbers are equal sets: {0}", _
allNumbers.SetEquals(lowNumbers))

' Show the results of sub/superset testing
Console.WriteLine("lowNumbers is a subset of allNumbers: {0}", _
lowNumbers.IsSubsetOf(allNumbers))
Console.WriteLine("allNumbers is a superset of lowNumbers: {0}", _
allNumbers.IsSupersetOf(lowNumbers))
Console.WriteLine("lowNumbers is a proper subset of allNumbers: {0}", _
lowNumbers.IsProperSubsetOf(allNumbers))
Console.WriteLine("allNumbers is a proper superset of lowNumbers: {0}", _
allNumbers.IsProperSupersetOf(lowNumbers))

' Modify allNumbers to remove numbers that are not in lowNumbers.
allNumbers.IntersectWith(lowNumbers)
Console.Write("allNumbers contains {0} elements: ", allNumbers.Count)
DisplaySet(allNumbers)

Console.WriteLine("allNumbers and lowNumbers are equal sets: {0}", _
allNumbers.SetEquals(lowNumbers))

' Show the results of sub/superset testing with the modified set.
Console.WriteLine("lowNumbers is a subset of allNumbers: {0}", _
lowNumbers.IsSubsetOf(allNumbers))
Console.WriteLine("allNumbers is a superset of lowNumbers: {0}", _
allNumbers.IsSupersetOf(lowNumbers))
Console.WriteLine("lowNumbers is a proper subset of allNumbers: {0}", _
lowNumbers.IsProperSubsetOf(allNumbers))
Console.WriteLine("allNumbers is a proper superset of lowNumbers: {0}", _
allNumbers.IsProperSupersetOf(lowNumbers))
End Sub
' This code example produces output similar to the following:
' lowNumbers contains 4 elements: { 1 2 3 4 }
' allNumbers contains 10 elements: { 0 1 2 3 4 5 6 7 8 9 }
' lowNumbers overlaps allNumbers: True
' allNumbers and lowNumbers are equal sets: False
' lowNumbers is a subset of allNumbers: True
' allNumbers is a superset of lowNumbers: True
' lowNumbers is a proper subset of allNumbers: True
' allNumbers is a proper superset of lowNumbers: True
' allNumbers contains 4 elements: { 1 2 3 4 }
' allNumbers and lowNumbers are equal sets: True
' lowNumbers is a subset of allNumbers: True
' allNumbers is a superset of lowNumbers: True
' lowNumbers is a proper subset of allNumbers: False
' allNumbers is a proper superset of lowNumbers: False
``````

## 注釈

が 内の `false` 要素の数より少ない場合 Count 、このメソッドは常に `other`を返します。

`other` 表されるコレクションが HashSet<T> 、現在 HashSet<T> のオブジェクトと同じ等値比較子を持つコレクションである場合、このメソッドは O(`n`) 操作です。 それ以外の場合、このメソッドは O(`n` + `m`) 操作です。ここで`n`、 は 内`other`の要素の数であり`m`、 は です。Count