Stack<T> 类

定义

表示相同指定类型的实例可变大小的后进先出 (LIFO) 集合。Represents a variable size last-in-first-out (LIFO) collection of instances of the same specified type.

generic <typename T>
public ref class Stack : System::Collections::Generic::IEnumerable<T>, System::Collections::Generic::IReadOnlyCollection<T>, System::Collections::ICollection
generic <typename T>
public ref class Stack : System::Collections::Generic::IEnumerable<T>, System::Collections::ICollection
public class Stack<T> : System.Collections.Generic.IEnumerable<T>, System.Collections.Generic.IReadOnlyCollection<T>, System.Collections.ICollection
[System.Runtime.InteropServices.ComVisible(false)]
[System.Serializable]
public class Stack<T> : System.Collections.Generic.IEnumerable<T>, System.Collections.ICollection
[System.Runtime.InteropServices.ComVisible(false)]
[System.Serializable]
public class Stack<T> : System.Collections.Generic.IEnumerable<T>, System.Collections.Generic.IReadOnlyCollection<T>, System.Collections.ICollection
public class Stack<T> : System.Collections.Generic.IEnumerable<T>, System.Collections.ICollection
type Stack<'T> = class
    interface seq<'T>
    interface IEnumerable
    interface IReadOnlyCollection<'T>
    interface ICollection
[<System.Runtime.InteropServices.ComVisible(false)>]
[<System.Serializable>]
type Stack<'T> = class
    interface seq<'T>
    interface ICollection
    interface IEnumerable
[<System.Runtime.InteropServices.ComVisible(false)>]
[<System.Serializable>]
type Stack<'T> = class
    interface seq<'T>
    interface IEnumerable
    interface ICollection
    interface IReadOnlyCollection<'T>
type Stack<'T> = class
    interface seq<'T>
    interface ICollection
    interface IEnumerable
[<System.Runtime.InteropServices.ComVisible(false)>]
[<System.Serializable>]
type Stack<'T> = class
    interface seq<'T>
    interface ICollection
    interface IReadOnlyCollection<'T>
    interface IEnumerable
Public Class Stack(Of T)
Implements ICollection, IEnumerable(Of T), IReadOnlyCollection(Of T)
Public Class Stack(Of T)
Implements ICollection, IEnumerable(Of T)

类型参数

T

指定堆栈中元素的类型。Specifies the type of elements in the stack.

继承
Stack<T>
属性
实现

示例

下面的代码示例演示了泛型类的几个方法 Stack<T>The following code example demonstrates several methods of the Stack<T> generic class. 此代码示例创建一个具有默认容量的字符串堆栈,并使用 Push 方法将五个字符串推送到堆栈上。The code example creates a stack of strings with default capacity and uses the Push method to push five strings onto the stack. 枚举堆栈的元素,这不会更改堆栈的状态。The elements of the stack are enumerated, which does not change the state of the stack. Pop方法用于弹出堆栈中的第一个字符串。The Pop method is used to pop the first string off the stack. Peek方法用于查看堆栈上的下一项,然后 Pop 使用方法将它弹出。The Peek method is used to look at the next item on the stack, and then the Pop method is used to pop it off.

ToArray方法用于创建数组,并将堆栈元素复制到该数组,然后将该数组传递给 Stack<T> 采用的构造函数,并 IEnumerable<T> 使用反转元素的顺序创建堆栈副本。The ToArray method is used to create an array and copy the stack elements to it, then the array is passed to the Stack<T> constructor that takes IEnumerable<T>, creating a copy of the stack with the order of the elements reversed. 将显示副本的元素。The elements of the copy are displayed.

创建堆栈大小两倍的数组,并 CopyTo 使用方法从数组中间开始复制数组元素。An array twice the size of the stack is created, and the CopyTo method is used to copy the array elements beginning at the middle of the array. Stack<T>再次使用构造函数来创建具有反转的元素顺序的堆栈副本; 因此,这三个 null 元素位于末尾。The Stack<T> constructor is used again to create a copy of the stack with the order of elements reversed; thus, the three null elements are at the end.

Contains方法用于显示字符串 "四" 位于堆栈的第一个副本中,在此之后, Clear 方法会清除副本, Count 属性会显示堆栈为空。The Contains method is used to show that the string "four" is in the first copy of the stack, after which the Clear method clears the copy and the Count property shows that the stack is empty.

using System;
using System.Collections.Generic;

class Example
{
    public static void Main()
    {
        Stack<string> numbers = new Stack<string>();
        numbers.Push("one");
        numbers.Push("two");
        numbers.Push("three");
        numbers.Push("four");
        numbers.Push("five");

        // A stack can be enumerated without disturbing its contents.
        foreach( string number in numbers )
        {
            Console.WriteLine(number);
        }

        Console.WriteLine("\nPopping '{0}'", numbers.Pop());
        Console.WriteLine("Peek at next item to destack: {0}",
            numbers.Peek());
        Console.WriteLine("Popping '{0}'", numbers.Pop());

        // Create a copy of the stack, using the ToArray method and the
        // constructor that accepts an IEnumerable<T>.
        Stack<string> stack2 = new Stack<string>(numbers.ToArray());

        Console.WriteLine("\nContents of the first copy:");
        foreach( string number in stack2 )
        {
            Console.WriteLine(number);
        }

        // Create an array twice the size of the stack and copy the
        // elements of the stack, starting at the middle of the
        // array.
        string[] array2 = new string[numbers.Count * 2];
        numbers.CopyTo(array2, numbers.Count);

        // Create a second stack, using the constructor that accepts an
        // IEnumerable(Of T).
        Stack<string> stack3 = new Stack<string>(array2);

        Console.WriteLine("\nContents of the second copy, with duplicates and nulls:");
        foreach( string number in stack3 )
        {
            Console.WriteLine(number);
        }

        Console.WriteLine("\nstack2.Contains(\"four\") = {0}",
            stack2.Contains("four"));

        Console.WriteLine("\nstack2.Clear()");
        stack2.Clear();
        Console.WriteLine("\nstack2.Count = {0}", stack2.Count);
    }
}

/* This code example produces the following output:

five
four
three
two
one

Popping 'five'
Peek at next item to destack: four
Popping 'four'

Contents of the first copy:
one
two
three

Contents of the second copy, with duplicates and nulls:
one
two
three




stack2.Contains("four") = False

stack2.Clear()

stack2.Count = 0
 */
Imports System.Collections.Generic

Module Example

    Sub Main

        Dim numbers As New Stack(Of String)
        numbers.Push("one")
        numbers.Push("two")
        numbers.Push("three")
        numbers.Push("four")
        numbers.Push("five")

        ' A stack can be enumerated without disturbing its contents.
        For Each number As String In numbers
            Console.WriteLine(number)
        Next

        Console.WriteLine(vbLf & "Popping '{0}'", numbers.Pop())
        Console.WriteLine("Peek at next item to pop: {0}", _
            numbers.Peek())    
        Console.WriteLine("Popping '{0}'", numbers.Pop())

        ' Create another stack, using the ToArray method and the
        ' constructor that accepts an IEnumerable(Of T). Note that
        ' the order of items on the new stack is reversed.
        Dim stack2 As New Stack(Of String)(numbers.ToArray())

        Console.WriteLine(vbLf & "Contents of the first copy:")
        For Each number As String In stack2
            Console.WriteLine(number)
        Next
        
        ' Create an array twice the size of the stack, compensating
        ' for the fact that Visual Basic allocates an extra array 
        ' element. Copy the elements of the stack, starting at the
        ' middle of the array. 
        Dim array2((numbers.Count * 2) - 1) As String
        numbers.CopyTo(array2, numbers.Count)
        
        ' Create a second stack, using the constructor that accepts an
        ' IEnumerable(Of T). The elements are reversed, with the null
        ' elements appearing at the end of the stack when enumerated.
        Dim stack3 As New Stack(Of String)(array2)

        Console.WriteLine(vbLf & _
            "Contents of the second copy, with duplicates and nulls:")
        For Each number As String In stack3
            Console.WriteLine(number)
        Next

        Console.WriteLine(vbLf & "stack2.Contains(""four"") = {0}", _
            stack2.Contains("four"))

        Console.WriteLine(vbLf & "stack2.Clear()")
        stack2.Clear()
        Console.WriteLine(vbLf & "stack2.Count = {0}", _
            stack2.Count)
    End Sub
End Module

' This code example produces the following output:
'
'five
'four
'three
'two
'one
'
'Popping 'five'
'Peek at next item to pop: four
'Popping 'four'
'
'Contents of the first copy:
'one
'two
'three
'
'Contents of the second copy, with duplicates and nulls:
'one
'two
'three
'
'
'
'
'stack2.Contains("four") = False
'
'stack2.Clear()
'
'stack2.Count = 0

注解

Stack<T> 以数组的形式实现。Stack<T> is implemented as an array.

当需要临时存储信息时,堆栈和队列很有用;也就是说,当你可能想要在检索元素值后丢弃该元素时。Stacks and queues are useful when you need temporary storage for information; that is, when you might want to discard an element after retrieving its value. Queue<T>如果需要以存储在集合中的相同顺序访问该信息,请使用。Use Queue<T> if you need to access the information in the same order that it is stored in the collection. System.Collections.Generic.Stack<T>如果需要按相反的顺序访问该信息,请使用。Use System.Collections.Generic.Stack<T> if you need to access the information in reverse order.

System.Collections.Concurrent.ConcurrentStack<T> System.Collections.Concurrent.ConcurrentQueue<T> 当需要同时从多个线程访问集合时,请使用和类型。Use the System.Collections.Concurrent.ConcurrentStack<T> and System.Collections.Concurrent.ConcurrentQueue<T> types when you need to access the collection from multiple threads concurrently.

的常见用途 System.Collections.Generic.Stack<T> 是在调用其他过程的过程中保留变量状态。A common use for System.Collections.Generic.Stack<T> is to preserve variable states during calls to other procedures.

可以对及其元素执行三个主要操作 System.Collections.Generic.Stack<T>Three main operations can be performed on a System.Collections.Generic.Stack<T> and its elements:

的容量 Stack<T> 是可容纳的元素数 Stack<T>The capacity of a Stack<T> is the number of elements the Stack<T> can hold. 当向添加元素时 Stack<T> ,将根据需要通过重新分配内部数组来自动增加容量。As elements are added to a Stack<T>, the capacity is automatically increased as required by reallocating the internal array. 可以通过调用来减少容量 TrimExcessThe capacity can be decreased by calling TrimExcess.

如果 Count 小于堆栈的容量, Push 则是 O (1) 操作。If Count is less than the capacity of the stack, Push is an O(1) operation. 如果需要增加容量以容纳新元素, Push 则会变成 O (n) 操作,其中 nCountIf the capacity needs to be increased to accommodate the new element, Push becomes an O(n) operation, where n is Count. Pop O (1) 操作。Pop is an O(1) operation.

Stack<T> 接受 null 作为引用类型的有效值,并允许重复元素。Stack<T> accepts null as a valid value for reference types and allows duplicate elements.

构造函数

Stack<T>()

初始化 Stack<T> 类的新实例,该实例为空并且具有默认初始容量。Initializes a new instance of the Stack<T> class that is empty and has the default initial capacity.

Stack<T>(IEnumerable<T>)

初始化 Stack<T> 类的新实例,该实例包含从指定集合复制的元素并且具有足够的容量来容纳所复制的元素。Initializes a new instance of the Stack<T> class that contains elements copied from the specified collection and has sufficient capacity to accommodate the number of elements copied.

Stack<T>(Int32)

初始化 Stack<T> 类的新实例,该实例为空并且具有指定的初始容量或默认初始容量(这两个容量中的较大者)。Initializes a new instance of the Stack<T> class that is empty and has the specified initial capacity or the default initial capacity, whichever is greater.

属性

Count

获取 Stack<T> 中包含的元素数。Gets the number of elements contained in the Stack<T>.

方法

Clear()

Stack<T> 中移除所有对象。Removes all objects from the Stack<T>.

Contains(T)

确定某元素是否在 Stack<T> 中。Determines whether an element is in the Stack<T>.

CopyTo(T[], Int32)

从指定的数组索引处开始,将 Stack<T> 复制到现有的一维 Array 中。Copies the Stack<T> to an existing one-dimensional Array, starting at the specified array index.

Equals(Object)

确定指定对象是否等于当前对象。Determines whether the specified object is equal to the current object.

(继承自 Object)
GetEnumerator()

返回 Stack<T> 的一个枚举数。Returns an enumerator for the Stack<T>.

GetHashCode()

作为默认哈希函数。Serves as the default hash function.

(继承自 Object)
GetType()

获取当前实例的 TypeGets the Type of the current instance.

(继承自 Object)
MemberwiseClone()

创建当前 Object 的浅表副本。Creates a shallow copy of the current Object.

(继承自 Object)
Peek()

返回位于 Stack<T> 顶部的对象但不将其移除。Returns the object at the top of the Stack<T> without removing it.

Pop()

删除并返回 Stack<T> 顶部的对象。Removes and returns the object at the top of the Stack<T>.

Push(T)

Stack<T> 的顶部插入一个对象。Inserts an object at the top of the Stack<T>.

ToArray()

Stack<T> 复制到新数组中。Copies the Stack<T> to a new array.

ToString()

返回表示当前对象的字符串。Returns a string that represents the current object.

(继承自 Object)
TrimExcess()

如果元素数小于当前容量的 90%,将容量设置为 Stack<T> 中的实际元素数。Sets the capacity to the actual number of elements in the Stack<T>, if that number is less than 90 percent of current capacity.

TryPeek(T)

返回一个值,该值指示在顶部是否有一个对象, Stack<T> 如果存在,则将它复制到 result 参数中。Returns a value that indicates whether there is an object at the top of the Stack<T>, and if one is present, copies it to the result parameter. 不会从中删除对象 Stack<T>The object is not removed from the Stack<T>.

TryPop(T)

返回一个值,该值指示在顶部是否有一个对象, Stack<T> 如果存在,则将它复制到 result 参数中,并将其从中移除 Stack<T>Returns a value that indicates whether there is an object at the top of the Stack<T>, and if one is present, copies it to the result parameter, and removes it from the Stack<T>.

显式接口实现

ICollection.CopyTo(Array, Int32)

从特定的 ICollection 索引开始,将 Array 的元素复制到一个 Array 中。Copies the elements of the ICollection to an Array, starting at a particular Array index.

ICollection.IsSynchronized

获取一个值,该值指示是否同步对 ICollection 的访问(线程安全)。Gets a value indicating whether access to the ICollection is synchronized (thread safe).

ICollection.SyncRoot

获取可用于同步对 ICollection 的访问的对象。Gets an object that can be used to synchronize access to the ICollection.

IEnumerable.GetEnumerator()

返回循环访问集合的枚举数。Returns an enumerator that iterates through a collection.

IEnumerable<T>.GetEnumerator()

返回一个循环访问集合的枚举器。Returns an enumerator that iterates through the collection.

扩展方法

ToImmutableArray<TSource>(IEnumerable<TSource>)

从指定的集合创建一个不可变数组。Creates an immutable array from the specified collection.

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

通过向源键应用转换函数,从现有元素集合构造一个不可变字典。Constructs an immutable dictionary from an existing collection of elements, applying a transformation function to the source keys.

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

基于对序列进行某种形式的转换来构造一个不可变字典。Constructs an immutable dictionary based on some transformation of a sequence.

ToImmutableDictionary<TSource,TKey,TValue>(IEnumerable<TSource>, Func<TSource,TKey>, Func<TSource,TValue>)

枚举并转换序列,然后生成其内容的不可变字典。Enumerates and transforms a sequence, and produces an immutable dictionary of its contents.

ToImmutableDictionary<TSource,TKey,TValue>(IEnumerable<TSource>, Func<TSource,TKey>, Func<TSource,TValue>, IEqualityComparer<TKey>)

枚举并转换序列,然后使用指定的键比较器生成其内容的不可变字典。Enumerates and transforms a sequence, and produces an immutable dictionary of its contents by using the specified key comparer.

ToImmutableDictionary<TSource,TKey,TValue>(IEnumerable<TSource>, Func<TSource,TKey>, Func<TSource,TValue>, IEqualityComparer<TKey>, IEqualityComparer<TValue>)

枚举并转换序列,然后使用指定的键和值比较器生成其内容的不可变字典。Enumerates and transforms a sequence, and produces an immutable dictionary of its contents by using the specified key and value comparers.

ToImmutableHashSet<TSource>(IEnumerable<TSource>)

枚举序列,并生成其内容的不可变哈希集。Enumerates a sequence and produces an immutable hash set of its contents.

ToImmutableHashSet<TSource>(IEnumerable<TSource>, IEqualityComparer<TSource>)

枚举序列,生成其内容的不可变哈希集,并为集类型使用指定的相等性比较器。Enumerates a sequence, produces an immutable hash set of its contents, and uses the specified equality comparer for the set type.

ToImmutableList<TSource>(IEnumerable<TSource>)

枚举序列,并生成其内容的不可变列表。Enumerates a sequence and produces an immutable list of its contents.

ToImmutableSortedDictionary<TSource,TKey,TValue>(IEnumerable<TSource>, Func<TSource,TKey>, Func<TSource,TValue>)

枚举并转换序列,然后生成其内容的不可变排序字典。Enumerates and transforms a sequence, and produces an immutable sorted dictionary of its contents.

ToImmutableSortedDictionary<TSource,TKey,TValue>(IEnumerable<TSource>, Func<TSource,TKey>, Func<TSource,TValue>, IComparer<TKey>)

枚举并转换序列,然后使用指定的键比较器生成其内容的不可变排序字典。Enumerates and transforms a sequence, and produces an immutable sorted dictionary of its contents by using the specified key comparer.

ToImmutableSortedDictionary<TSource,TKey,TValue>(IEnumerable<TSource>, Func<TSource,TKey>, Func<TSource,TValue>, IComparer<TKey>, IEqualityComparer<TValue>)

枚举并转换序列,然后使用指定的键和值比较器生成其内容的不可变排序字典。Enumerates and transforms a sequence, and produces an immutable sorted dictionary of its contents by using the specified key and value comparers.

ToImmutableSortedSet<TSource>(IEnumerable<TSource>)

枚举序列,并生成其内容的不可变排序集。Enumerates a sequence and produces an immutable sorted set of its contents.

ToImmutableSortedSet<TSource>(IEnumerable<TSource>, IComparer<TSource>)

枚举序列,生成其内容的不可变排序集,并使用指定的比较器。Enumerates a sequence, produces an immutable sorted set of its contents, and uses the specified comparer.

CopyToDataTable<T>(IEnumerable<T>)

在给定其泛型参数 TDataTable 的输入 DataRow 对象的情况下,返回包含 IEnumerable<T> 对象副本的 DataRowReturns a DataTable that contains copies of the DataRow objects, given an input IEnumerable<T> object where the generic parameter T is DataRow.

CopyToDataTable<T>(IEnumerable<T>, DataTable, LoadOption)

在给定其泛型参数 TDataRow 的输入 DataTable 对象的情况下,将 IEnumerable<T> 对象复制到指定的 DataRowCopies DataRow objects to the specified DataTable, given an input IEnumerable<T> object where the generic parameter T is DataRow.

CopyToDataTable<T>(IEnumerable<T>, DataTable, LoadOption, FillErrorEventHandler)

在给定其泛型参数 TDataRow 的输入 DataTable 对象的情况下,将 IEnumerable<T> 对象复制到指定的 DataRowCopies DataRow objects to the specified DataTable, given an input IEnumerable<T> object where the generic parameter T is DataRow.

Aggregate<TSource>(IEnumerable<TSource>, Func<TSource,TSource,TSource>)

对序列应用累加器函数。Applies an accumulator function over a sequence.

Aggregate<TSource,TAccumulate>(IEnumerable<TSource>, TAccumulate, Func<TAccumulate,TSource,TAccumulate>)

对序列应用累加器函数。Applies an accumulator function over a sequence. 将指定的种子值用作累加器初始值。The specified seed value is used as the initial accumulator value.

Aggregate<TSource,TAccumulate,TResult>(IEnumerable<TSource>, TAccumulate, Func<TAccumulate,TSource,TAccumulate>, Func<TAccumulate,TResult>)

对序列应用累加器函数。Applies an accumulator function over a sequence. 将指定的种子值用作累加器的初始值,并使用指定的函数选择结果值。The specified seed value is used as the initial accumulator value, and the specified function is used to select the result value.

All<TSource>(IEnumerable<TSource>, Func<TSource,Boolean>)

确定序列中的所有元素是否都满足条件。Determines whether all elements of a sequence satisfy a condition.

Any<TSource>(IEnumerable<TSource>)

确定序列是否包含任何元素。Determines whether a sequence contains any elements.

Any<TSource>(IEnumerable<TSource>, Func<TSource,Boolean>)

确定序列中是否存在任意一个元素满足条件。Determines whether any element of a sequence satisfies a condition.

Append<TSource>(IEnumerable<TSource>, TSource)

将一个值追加到序列末尾。Appends a value to the end of the sequence.

AsEnumerable<TSource>(IEnumerable<TSource>)

返回类型化为 IEnumerable<T> 的输入。Returns the input typed as IEnumerable<T>.

Average<TSource>(IEnumerable<TSource>, Func<TSource,Decimal>)

计算 Decimal 值序列的平均值,这些值可通过对输入序列的每个元素调用转换函数获得。Computes the average of a sequence of Decimal values that are obtained by invoking a transform function on each element of the input sequence.

Average<TSource>(IEnumerable<TSource>, Func<TSource,Double>)

计算 Double 值序列的平均值,这些值可通过对输入序列的每个元素调用转换函数获得。Computes the average of a sequence of Double values that are obtained by invoking a transform function on each element of the input sequence.

Average<TSource>(IEnumerable<TSource>, Func<TSource,Int32>)

计算 Int32 值序列的平均值,这些值可通过对输入序列的每个元素调用转换函数获得。Computes the average of a sequence of Int32 values that are obtained by invoking a transform function on each element of the input sequence.

Average<TSource>(IEnumerable<TSource>, Func<TSource,Int64>)

计算 Int64 值序列的平均值,这些值可通过对输入序列的每个元素调用转换函数获得。Computes the average of a sequence of Int64 values that are obtained by invoking a transform function on each element of the input sequence.

Average<TSource>(IEnumerable<TSource>, Func<TSource,Nullable<Decimal>>)

计算可以为 null 的 Decimal 值序列的平均值,这些值可通过对输入序列的每个元素调用转换函数获得。Computes the average of a sequence of nullable Decimal values that are obtained by invoking a transform function on each element of the input sequence.

Average<TSource>(IEnumerable<TSource>, Func<TSource,Nullable<Double>>)

计算可以为 null 的 Double 值序列的平均值,这些值可通过对输入序列的每个元素调用转换函数获得。Computes the average of a sequence of nullable Double values that are obtained by invoking a transform function on each element of the input sequence.

Average<TSource>(IEnumerable<TSource>, Func<TSource,Nullable<Int32>>)

计算可以为 null 的 Int32 值序列的平均值,这些值可通过对输入序列的每个元素调用转换函数获得。Computes the average of a sequence of nullable Int32 values that are obtained by invoking a transform function on each element of the input sequence.

Average<TSource>(IEnumerable<TSource>, Func<TSource,Nullable<Int64>>)

计算可以为 null 的 Int64 值序列的平均值,这些值可通过对输入序列的每个元素调用转换函数获得。Computes the average of a sequence of nullable Int64 values that are obtained by invoking a transform function on each element of the input sequence.

Average<TSource>(IEnumerable<TSource>, Func<TSource,Nullable<Single>>)

计算可以为 null 的 Single 值序列的平均值,这些值可通过对输入序列的每个元素调用转换函数获得。Computes the average of a sequence of nullable Single values that are obtained by invoking a transform function on each element of the input sequence.

Average<TSource>(IEnumerable<TSource>, Func<TSource,Single>)

计算 Single 值序列的平均值,这些值可通过对输入序列的每个元素调用转换函数获得。Computes the average of a sequence of Single values that are obtained by invoking a transform function on each element of the input sequence.

Cast<TResult>(IEnumerable)

IEnumerable 的元素强制转换为指定的类型。Casts the elements of an IEnumerable to the specified type.

Concat<TSource>(IEnumerable<TSource>, IEnumerable<TSource>)

连接两个序列。Concatenates two sequences.

Contains<TSource>(IEnumerable<TSource>, TSource)

通过使用默认的相等比较器确定序列是否包含指定的元素。Determines whether a sequence contains a specified element by using the default equality comparer.

Contains<TSource>(IEnumerable<TSource>, TSource, IEqualityComparer<TSource>)

通过使用指定的 IEqualityComparer<T> 确定序列是否包含指定的元素。Determines whether a sequence contains a specified element by using a specified IEqualityComparer<T>.

Count<TSource>(IEnumerable<TSource>)

返回序列中的元素数量。Returns the number of elements in a sequence.

Count<TSource>(IEnumerable<TSource>, Func<TSource,Boolean>)

返回表示在指定的序列中满足条件的元素数量的数字。Returns a number that represents how many elements in the specified sequence satisfy a condition.

DefaultIfEmpty<TSource>(IEnumerable<TSource>)

返回指定序列中的元素;如果序列为空,则返回单一实例集合中的类型参数的默认值。Returns the elements of the specified sequence or the type parameter's default value in a singleton collection if the sequence is empty.

DefaultIfEmpty<TSource>(IEnumerable<TSource>, TSource)

返回指定序列中的元素;如果序列为空,则返回单一实例集合中的指定值。Returns the elements of the specified sequence or the specified value in a singleton collection if the sequence is empty.

Distinct<TSource>(IEnumerable<TSource>)

通过使用默认的相等比较器对值进行比较,返回序列中的非重复元素。Returns distinct elements from a sequence by using the default equality comparer to compare values.

Distinct<TSource>(IEnumerable<TSource>, IEqualityComparer<TSource>)

通过使用指定的 IEqualityComparer<T> 对值进行比较,返回序列中的非重复元素。Returns distinct elements from a sequence by using a specified IEqualityComparer<T> to compare values.

ElementAt<TSource>(IEnumerable<TSource>, Int32)

返回序列中指定索引处的元素。Returns the element at a specified index in a sequence.

ElementAtOrDefault<TSource>(IEnumerable<TSource>, Int32)

返回序列中指定索引处的元素;如果索引超出范围,则返回默认值。Returns the element at a specified index in a sequence or a default value if the index is out of range.

Except<TSource>(IEnumerable<TSource>, IEnumerable<TSource>)

通过使用默认的相等比较器对值进行比较,生成两个序列的差集。Produces the set difference of two sequences by using the default equality comparer to compare values.

Except<TSource>(IEnumerable<TSource>, IEnumerable<TSource>, IEqualityComparer<TSource>)

通过使用指定的 IEqualityComparer<T> 对值进行比较,生成两个序列的差集。Produces the set difference of two sequences by using the specified IEqualityComparer<T> to compare values.

First<TSource>(IEnumerable<TSource>)

返回序列中的第一个元素。Returns the first element of a sequence.

First<TSource>(IEnumerable<TSource>, Func<TSource,Boolean>)

返回序列中满足指定条件的第一个元素。Returns the first element in a sequence that satisfies a specified condition.

FirstOrDefault<TSource>(IEnumerable<TSource>)

返回序列中的第一个元素;如果序列中不包含任何元素,则返回默认值。Returns the first element of a sequence, or a default value if the sequence contains no elements.

FirstOrDefault<TSource>(IEnumerable<TSource>, Func<TSource,Boolean>)

返回序列中满足条件的第一个元素;如果未找到这样的元素,则返回默认值。Returns the first element of the sequence that satisfies a condition or a default value if no such element is found.

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

根据指定的键选择器函数对序列中的元素进行分组。Groups the elements of a sequence according to a specified key selector function.

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

根据指定的键选择器函数对序列中的元素进行分组,并使用指定的比较器对键进行比较。Groups the elements of a sequence according to a specified key selector function and compares the keys by using a specified comparer.

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

根据指定的键选择器函数对序列中的元素进行分组,并且通过使用指定的函数对每个组中的元素进行投影。Groups the elements of a sequence according to a specified key selector function and projects the elements for each group by using a specified function.

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

根据键选择器函数对序列中的元素进行分组。Groups the elements of a sequence according to a key selector function. 通过使用比较器对键进行比较,并且通过使用指定的函数对每个组的元素进行投影。The keys are compared by using a comparer and each group's elements are projected by using a specified function.

GroupBy<TSource,TKey,TResult>(IEnumerable<TSource>, Func<TSource,TKey>, Func<TKey,IEnumerable<TSource>,TResult>)

根据指定的键选择器函数对序列中的元素进行分组,并且从每个组及其键中创建结果值。Groups the elements of a sequence according to a specified key selector function and creates a result value from each group and its key.

GroupBy<TSource,TKey,TResult>(IEnumerable<TSource>, Func<TSource,TKey>, Func<TKey,IEnumerable<TSource>,TResult>, IEqualityComparer<TKey>)

根据指定的键选择器函数对序列中的元素进行分组,并且从每个组及其键中创建结果值。Groups the elements of a sequence according to a specified key selector function and creates a result value from each group and its key. 通过使用指定的比较器对键进行比较。The keys are compared by using a specified comparer.

GroupBy<TSource,TKey,TElement,TResult>(IEnumerable<TSource>, Func<TSource,TKey>, Func<TSource,TElement>, Func<TKey,IEnumerable<TElement>,TResult>)

根据指定的键选择器函数对序列中的元素进行分组,并且从每个组及其键中创建结果值。Groups the elements of a sequence according to a specified key selector function and creates a result value from each group and its key. 通过使用指定的函数对每个组的元素进行投影。The elements of each group are projected by using a specified function.

GroupBy<TSource,TKey,TElement,TResult>(IEnumerable<TSource>, Func<TSource,TKey>, Func<TSource,TElement>, Func<TKey,IEnumerable<TElement>,TResult>, IEqualityComparer<TKey>)

根据指定的键选择器函数对序列中的元素进行分组,并且从每个组及其键中创建结果值。Groups the elements of a sequence according to a specified key selector function and creates a result value from each group and its key. 通过使用指定的比较器对键值进行比较,并且通过使用指定的函数对每个组的元素进行投影。Key values are compared by using a specified comparer, and the elements of each group are projected by using a specified function.

GroupJoin<TOuter,TInner,TKey,TResult>(IEnumerable<TOuter>, IEnumerable<TInner>, Func<TOuter,TKey>, Func<TInner,TKey>, Func<TOuter,IEnumerable<TInner>,TResult>)

基于键值等同性对两个序列的元素进行关联,并对结果进行分组。Correlates the elements of two sequences based on equality of keys and groups the results. 使用默认的相等比较器对键进行比较。The default equality comparer is used to compare keys.

GroupJoin<TOuter,TInner,TKey,TResult>(IEnumerable<TOuter>, IEnumerable<TInner>, Func<TOuter,TKey>, Func<TInner,TKey>, Func<TOuter,IEnumerable<TInner>,TResult>, IEqualityComparer<TKey>)

基于键值等同性对两个序列的元素进行关联,并对结果进行分组。Correlates the elements of two sequences based on key equality and groups the results. 使用指定的 IEqualityComparer<T> 对键进行比较。A specified IEqualityComparer<T> is used to compare keys.

Intersect<TSource>(IEnumerable<TSource>, IEnumerable<TSource>)

通过使用默认的相等比较器对值进行比较,生成两个序列的交集。Produces the set intersection of two sequences by using the default equality comparer to compare values.

Intersect<TSource>(IEnumerable<TSource>, IEnumerable<TSource>, IEqualityComparer<TSource>)

通过使用指定的 IEqualityComparer<T> 对值进行比较,生成两个序列的交集。Produces the set intersection of two sequences by using the specified IEqualityComparer<T> to compare values.

Join<TOuter,TInner,TKey,TResult>(IEnumerable<TOuter>, IEnumerable<TInner>, Func<TOuter,TKey>, Func<TInner,TKey>, Func<TOuter,TInner,TResult>)

基于匹配键对两个序列的元素进行关联。Correlates the elements of two sequences based on matching keys. 使用默认的相等比较器对键进行比较。The default equality comparer is used to compare keys.

Join<TOuter,TInner,TKey,TResult>(IEnumerable<TOuter>, IEnumerable<TInner>, Func<TOuter,TKey>, Func<TInner,TKey>, Func<TOuter,TInner,TResult>, IEqualityComparer<TKey>)

基于匹配键对两个序列的元素进行关联。Correlates the elements of two sequences based on matching keys. 使用指定的 IEqualityComparer<T> 对键进行比较。A specified IEqualityComparer<T> is used to compare keys.

Last<TSource>(IEnumerable<TSource>)

返回序列的最后一个元素。Returns the last element of a sequence.

Last<TSource>(IEnumerable<TSource>, Func<TSource,Boolean>)

返回序列中满足指定条件的最后一个元素。Returns the last element of a sequence that satisfies a specified condition.

LastOrDefault<TSource>(IEnumerable<TSource>)

返回序列中的最后一个元素;如果序列中不包含任何元素,则返回默认值。Returns the last element of a sequence, or a default value if the sequence contains no elements.

LastOrDefault<TSource>(IEnumerable<TSource>, Func<TSource,Boolean>)

返回序列中满足条件的最后一个元素;如果未找到这样的元素,则返回默认值。Returns the last element of a sequence that satisfies a condition or a default value if no such element is found.

LongCount<TSource>(IEnumerable<TSource>)

返回表示序列中元素总数的 Int64Returns an Int64 that represents the total number of elements in a sequence.

LongCount<TSource>(IEnumerable<TSource>, Func<TSource,Boolean>)

返回表示序列中满足条件的元素的数量的 Int64Returns an Int64 that represents how many elements in a sequence satisfy a condition.

Max<TSource>(IEnumerable<TSource>)

返回泛型序列中的最大值。Returns the maximum value in a generic sequence.

Max<TSource>(IEnumerable<TSource>, Func<TSource,Decimal>)

对序列中的每个元素调用转换函数,并返回最大的 Decimal 值。Invokes a transform function on each element of a sequence and returns the maximum Decimal value.

Max<TSource>(IEnumerable<TSource>, Func<TSource,Double>)

对序列中的每个元素调用转换函数,并返回最大的 Double 值。Invokes a transform function on each element of a sequence and returns the maximum Double value.

Max<TSource>(IEnumerable<TSource>, Func<TSource,Int32>)

对序列中的每个元素调用转换函数,并返回最大的 Int32 值。Invokes a transform function on each element of a sequence and returns the maximum Int32 value.

Max<TSource>(IEnumerable<TSource>, Func<TSource,Int64>)

对序列中的每个元素调用转换函数,并返回最大的 Int64 值。Invokes a transform function on each element of a sequence and returns the maximum Int64 value.

Max<TSource>(IEnumerable<TSource>, Func<TSource,Nullable<Decimal>>)

对序列中的每个元素调用转换函数,并返回可以为 null 的最大的 Decimal 值。Invokes a transform function on each element of a sequence and returns the maximum nullable Decimal value.

Max<TSource>(IEnumerable<TSource>, Func<TSource,Nullable<Double>>)

对序列中的每个元素调用转换函数,并返回可以为 null 的最大的 Double 值。Invokes a transform function on each element of a sequence and returns the maximum nullable Double value.

Max<TSource>(IEnumerable<TSource>, Func<TSource,Nullable<Int32>>)

对序列中的每个元素调用转换函数,并返回可以为 null 的最大的 Int32 值。Invokes a transform function on each element of a sequence and returns the maximum nullable Int32 value.

Max<TSource>(IEnumerable<TSource>, Func<TSource,Nullable<Int64>>)

对序列中的每个元素调用转换函数,并返回可以为 null 的最大的 Int64 值。Invokes a transform function on each element of a sequence and returns the maximum nullable Int64 value.

Max<TSource>(IEnumerable<TSource>, Func<TSource,Nullable<Single>>)

对序列中的每个元素调用转换函数,并返回可以为 null 的最大的 Single 值。Invokes a transform function on each element of a sequence and returns the maximum nullable Single value.

Max<TSource>(IEnumerable<TSource>, Func<TSource,Single>)

对序列中的每个元素调用转换函数,并返回最大的 Single 值。Invokes a transform function on each element of a sequence and returns the maximum Single value.

Max<TSource,TResult>(IEnumerable<TSource>, Func<TSource,TResult>)

对序列中的每个元素调用转换函数,并返回最大结果值。Invokes a transform function on each element of a generic sequence and returns the maximum resulting value.

Min<TSource>(IEnumerable<TSource>)

返回泛型序列中的最小值。Returns the minimum value in a generic sequence.

Min<TSource>(IEnumerable<TSource>, Func<TSource,Decimal>)

对序列中的每个元素调用转换函数,并返回最小的 Decimal 值。Invokes a transform function on each element of a sequence and returns the minimum Decimal value.

Min<TSource>(IEnumerable<TSource>, Func<TSource,Double>)

对序列中的每个元素调用转换函数,并返回最小的 Double 值。Invokes a transform function on each element of a sequence and returns the minimum Double value.

Min<TSource>(IEnumerable<TSource>, Func<TSource,Int32>)

对序列中的每个元素调用转换函数,并返回最小的 Int32 值。Invokes a transform function on each element of a sequence and returns the minimum Int32 value.

Min<TSource>(IEnumerable<TSource>, Func<TSource,Int64>)

对序列中的每个元素调用转换函数,并返回最小的 Int64 值。Invokes a transform function on each element of a sequence and returns the minimum Int64 value.

Min<TSource>(IEnumerable<TSource>, Func<TSource,Nullable<Decimal>>)

对序列中的每个元素调用转换函数,并返回可以为 null 的最小的 Decimal 值。Invokes a transform function on each element of a sequence and returns the minimum nullable Decimal value.

Min<TSource>(IEnumerable<TSource>, Func<TSource,Nullable<Double>>)

对序列中的每个元素调用转换函数,并返回可以为 null 的最小的 Double 值。Invokes a transform function on each element of a sequence and returns the minimum nullable Double value.

Min<TSource>(IEnumerable<TSource>, Func<TSource,Nullable<Int32>>)

对序列中的每个元素调用转换函数,并返回可以为 null 的最小的 Int32 值。Invokes a transform function on each element of a sequence and returns the minimum nullable Int32 value.

Min<TSource>(IEnumerable<TSource>, Func<TSource,Nullable<Int64>>)

对序列中的每个元素调用转换函数,并返回可以为 null 的最小的 Int64 值。Invokes a transform function on each element of a sequence and returns the minimum nullable Int64 value.

Min<TSource>(IEnumerable<TSource>, Func<TSource,Nullable<Single>>)

对序列中的每个元素调用转换函数,并返回可以为 null 的最小的 Single 值。Invokes a transform function on each element of a sequence and returns the minimum nullable Single value.

Min<TSource>(IEnumerable<TSource>, Func<TSource,Single>)

对序列中的每个元素调用转换函数,并返回最小的 Single 值。Invokes a transform function on each element of a sequence and returns the minimum Single value.

Min<TSource,TResult>(IEnumerable<TSource>, Func<TSource,TResult>)

对序列中的每个元素调用转换函数,并返回最小结果值。Invokes a transform function on each element of a generic sequence and returns the minimum resulting value.

OfType<TResult>(IEnumerable)

根据指定类型筛选 IEnumerable 的元素。Filters the elements of an IEnumerable based on a specified type.

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

根据键按升序对序列的元素进行排序。Sorts the elements of a sequence in ascending order according to a key.

OrderBy<TSource,TKey>(IEnumerable<TSource>, Func<TSource,TKey>, IComparer<TKey>)

使用指定的比较器按升序对序列的元素进行排序。Sorts the elements of a sequence in ascending order by using a specified comparer.

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

根据键按降序对序列的元素进行排序。Sorts the elements of a sequence in descending order according to a key.

OrderByDescending<TSource,TKey>(IEnumerable<TSource>, Func<TSource,TKey>, IComparer<TKey>)

使用指定的比较器按降序对序列的元素排序。Sorts the elements of a sequence in descending order by using a specified comparer.

Prepend<TSource>(IEnumerable<TSource>, TSource)

向序列的开头添加值。Adds a value to the beginning of the sequence.

Reverse<TSource>(IEnumerable<TSource>)

反转序列中元素的顺序。Inverts the order of the elements in a sequence.

Select<TSource,TResult>(IEnumerable<TSource>, Func<TSource,TResult>)

将序列中的每个元素投影到新表单。Projects each element of a sequence into a new form.

Select<TSource,TResult>(IEnumerable<TSource>, Func<TSource,Int32,TResult>)

通过合并元素的索引,将序列的每个元素投影到新窗体中。Projects each element of a sequence into a new form by incorporating the element's index.

SelectMany<TSource,TResult>(IEnumerable<TSource>, Func<TSource,IEnumerable<TResult>>)

将序列的每个元素投影到 IEnumerable<T> 并将结果序列合并为一个序列。Projects each element of a sequence to an IEnumerable<T> and flattens the resulting sequences into one sequence.

SelectMany<TSource,TResult>(IEnumerable<TSource>, Func<TSource,Int32,IEnumerable<TResult>>)

将序列的每个元素投影到 IEnumerable<T> 并将结果序列合并为一个序列。Projects each element of a sequence to an IEnumerable<T>, and flattens the resulting sequences into one sequence. 每个源元素的索引用于该元素的投影表。The index of each source element is used in the projected form of that element.

SelectMany<TSource,TCollection,TResult>(IEnumerable<TSource>, Func<TSource,IEnumerable<TCollection>>, Func<TSource,TCollection,TResult>)

将序列的每个元素投影到 IEnumerable<T>,并将结果序列合并为一个序列,并对其中每个元素调用结果选择器函数。Projects each element of a sequence to an IEnumerable<T>, flattens the resulting sequences into one sequence, and invokes a result selector function on each element therein.

SelectMany<TSource,TCollection,TResult>(IEnumerable<TSource>, Func<TSource,Int32,IEnumerable<TCollection>>, Func<TSource,TCollection,TResult>)

将序列的每个元素投影到 IEnumerable<T>,并将结果序列合并为一个序列,并对其中每个元素调用结果选择器函数。Projects each element of a sequence to an IEnumerable<T>, flattens the resulting sequences into one sequence, and invokes a result selector function on each element therein. 每个源元素的索引用于该元素的中间投影表。The index of each source element is used in the intermediate projected form of that element.

SequenceEqual<TSource>(IEnumerable<TSource>, IEnumerable<TSource>)

通过使用相应类型的默认相等比较器对序列的元素进行比较,以确定两个序列是否相等。Determines whether two sequences are equal by comparing the elements by using the default equality comparer for their type.

SequenceEqual<TSource>(IEnumerable<TSource>, IEnumerable<TSource>, IEqualityComparer<TSource>)

通过使用指定的 IEqualityComparer<T> 来比较两个序列的元素,以确定这两个序列是否相等。Determines whether two sequences are equal by comparing their elements by using a specified IEqualityComparer<T>.

Single<TSource>(IEnumerable<TSource>)

返回序列的唯一元素;如果该序列并非恰好包含一个元素,则会引发异常。Returns the only element of a sequence, and throws an exception if there is not exactly one element in the sequence.

Single<TSource>(IEnumerable<TSource>, Func<TSource,Boolean>)

返回序列中满足指定条件的唯一元素;如果有多个这样的元素存在,则会引发异常。Returns the only element of a sequence that satisfies a specified condition, and throws an exception if more than one such element exists.

SingleOrDefault<TSource>(IEnumerable<TSource>)

返回序列中的唯一元素;如果该序列为空,则返回默认值;如果该序列包含多个元素,此方法将引发异常。Returns the only element of a sequence, or a default value if the sequence is empty; this method throws an exception if there is more than one element in the sequence.

SingleOrDefault<TSource>(IEnumerable<TSource>, Func<TSource,Boolean>)

返回序列中满足指定条件的唯一元素;如果这类元素不存在,则返回默认值;如果有多个元素满足该条件,此方法将引发异常。Returns the only element of a sequence that satisfies a specified condition or a default value if no such element exists; this method throws an exception if more than one element satisfies the condition.

Skip<TSource>(IEnumerable<TSource>, Int32)

跳过序列中指定数量的元素,然后返回剩余的元素。Bypasses a specified number of elements in a sequence and then returns the remaining elements.

SkipLast<TSource>(IEnumerable<TSource>, Int32)

返回一个新的可枚举集合,它包含 source 中的元素,但省略了源集合中的 count 个元素。Returns a new enumerable collection that contains the elements from source with the last count elements of the source collection omitted.

SkipWhile<TSource>(IEnumerable<TSource>, Func<TSource,Boolean>)

如果指定的条件为 true,则跳过序列中的元素,然后返回剩余的元素。Bypasses elements in a sequence as long as a specified condition is true and then returns the remaining elements.

SkipWhile<TSource>(IEnumerable<TSource>, Func<TSource,Int32,Boolean>)

如果指定的条件为 true,则跳过序列中的元素,然后返回剩余的元素。Bypasses elements in a sequence as long as a specified condition is true and then returns the remaining elements. 将在谓词函数的逻辑中使用元素的索引。The element's index is used in the logic of the predicate function.

Sum<TSource>(IEnumerable<TSource>, Func<TSource,Decimal>)

计算 Decimal 值序列的总和,这些值可通过对输入序列中的每个元素调用转换函数获得。Computes the sum of the sequence of Decimal values that are obtained by invoking a transform function on each element of the input sequence.

Sum<TSource>(IEnumerable<TSource>, Func<TSource,Double>)

计算 Double 值序列的总和,这些值可通过对输入序列中的每个元素调用转换函数获得。Computes the sum of the sequence of Double values that are obtained by invoking a transform function on each element of the input sequence.

Sum<TSource>(IEnumerable<TSource>, Func<TSource,Int32>)

计算 Int32 值序列的总和,这些值可通过对输入序列中的每个元素调用转换函数获得。Computes the sum of the sequence of Int32 values that are obtained by invoking a transform function on each element of the input sequence.

Sum<TSource>(IEnumerable<TSource>, Func<TSource,Int64>)

计算 Int64 值序列的总和,这些值可通过对输入序列中的每个元素调用转换函数获得。Computes the sum of the sequence of Int64 values that are obtained by invoking a transform function on each element of the input sequence.

Sum<TSource>(IEnumerable<TSource>, Func<TSource,Nullable<Decimal>>)

计算可以为 null 的 Decimal 值序列的总和,这些值可通过对输入序列的每个元素调用转换函数获得。Computes the sum of the sequence of nullable Decimal values that are obtained by invoking a transform function on each element of the input sequence.

Sum<TSource>(IEnumerable<TSource>, Func<TSource,Nullable<Double>>)

计算可以为 null 的 Double 值序列的总和,这些值可通过对输入序列的每个元素调用转换函数获得。Computes the sum of the sequence of nullable Double values that are obtained by invoking a transform function on each element of the input sequence.

Sum<TSource>(IEnumerable<TSource>, Func<TSource,Nullable<Int32>>)

计算可以为 null 的 Int32 值序列的总和,这些值可通过对输入序列的每个元素调用转换函数获得。Computes the sum of the sequence of nullable Int32 values that are obtained by invoking a transform function on each element of the input sequence.

Sum<TSource>(IEnumerable<TSource>, Func<TSource,Nullable<Int64>>)

计算可以为 null 的 Int64 值序列的总和,这些值可通过对输入序列的每个元素调用转换函数获得。Computes the sum of the sequence of nullable Int64 values that are obtained by invoking a transform function on each element of the input sequence.

Sum<TSource>(IEnumerable<TSource>, Func<TSource,Nullable<Single>>)

计算可以为 null 的 Single 值序列的总和,这些值可通过对输入序列的每个元素调用转换函数获得。Computes the sum of the sequence of nullable Single values that are obtained by invoking a transform function on each element of the input sequence.

Sum<TSource>(IEnumerable<TSource>, Func<TSource,Single>)

计算 Single 值序列的总和,这些值可通过对输入序列中的每个元素调用转换函数获得。Computes the sum of the sequence of Single values that are obtained by invoking a transform function on each element of the input sequence.

Take<TSource>(IEnumerable<TSource>, Int32)

从序列的开头返回指定数量的相邻元素。Returns a specified number of contiguous elements from the start of a sequence.

TakeLast<TSource>(IEnumerable<TSource>, Int32)

返回一个新的可枚举集合,它包含 count 中的最后 source 个元素。Returns a new enumerable collection that contains the last count elements from source.

TakeWhile<TSource>(IEnumerable<TSource>, Func<TSource,Boolean>)

只要指定的条件为 true,就会返回序列的元素。Returns elements from a sequence as long as a specified condition is true.

TakeWhile<TSource>(IEnumerable<TSource>, Func<TSource,Int32,Boolean>)

只要指定的条件为 true,就会返回序列的元素。Returns elements from a sequence as long as a specified condition is true. 将在谓词函数的逻辑中使用元素的索引。The element's index is used in the logic of the predicate function.

ToArray<TSource>(IEnumerable<TSource>)

IEnumerable<T> 中创建数组。Creates an array from a IEnumerable<T>.

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

根据指定的键选择器函数,从 IEnumerable<T> 创建一个 Dictionary<TKey,TValue>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>)

根据指定的键选择器函数和键比较器,从 IEnumerable<T> 创建一个 Dictionary<TKey,TValue>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>)

根据指定的键选择器和元素选择器函数,从 IEnumerable<T> 创建一个 Dictionary<TKey,TValue>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>)

根据指定的键选择器函数、比较器和元素选择器函数,从 IEnumerable<T> 创建一个 Dictionary<TKey,TValue>Creates a Dictionary<TKey,TValue> from an IEnumerable<T> according to a specified key selector function, a comparer, and an element selector function.

ToHashSet<TSource>(IEnumerable<TSource>)

IEnumerable<T> 创建一个 HashSet<T>Creates a HashSet<T> from an IEnumerable<T>.

ToHashSet<TSource>(IEnumerable<TSource>, IEqualityComparer<TSource>)

使用 comparer 通过 IEnumerable<T> 创建 HashSet<T>,以用于比较键。Creates a HashSet<T> from an IEnumerable<T> using the comparer to compare keys.

ToList<TSource>(IEnumerable<TSource>)

IEnumerable<T> 创建一个 List<T>Creates a List<T> from an IEnumerable<T>.

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

根据指定的键选择器函数,从 IEnumerable<T> 创建一个 Lookup<TKey,TElement>Creates a Lookup<TKey,TElement> from an IEnumerable<T> according to a specified key selector function.

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

根据指定的键选择器函数和键比较器,从 IEnumerable<T> 创建一个 Lookup<TKey,TElement>Creates a Lookup<TKey,TElement> from an IEnumerable<T> according to a specified key selector function and key comparer.

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

根据指定的键选择器和元素选择器函数,从 IEnumerable<T> 创建一个 Lookup<TKey,TElement>Creates a Lookup<TKey,TElement> from an IEnumerable<T> according to specified key selector and element selector functions.

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

根据指定的键选择器函数、比较器和元素选择器函数,从 IEnumerable<T> 创建一个 Lookup<TKey,TElement>Creates a Lookup<TKey,TElement> from an IEnumerable<T> according to a specified key selector function, a comparer and an element selector function.

Union<TSource>(IEnumerable<TSource>, IEnumerable<TSource>)

通过使用默认的相等比较器,生成两个序列的并集。Produces the set union of two sequences by using the default equality comparer.

Union<TSource>(IEnumerable<TSource>, IEnumerable<TSource>, IEqualityComparer<TSource>)

通过使用指定的 IEqualityComparer<T> 生成两个序列的并集。Produces the set union of two sequences by using a specified IEqualityComparer<T>.

Where<TSource>(IEnumerable<TSource>, Func<TSource,Boolean>)

基于谓词筛选值序列。Filters a sequence of values based on a predicate.

Where<TSource>(IEnumerable<TSource>, Func<TSource,Int32,Boolean>)

基于谓词筛选值序列。Filters a sequence of values based on a predicate. 将在谓词函数的逻辑中使用每个元素的索引。Each element's index is used in the logic of the predicate function.

Zip<TFirst,TSecond>(IEnumerable<TFirst>, IEnumerable<TSecond>)

使用两个指定序列中的元素生成元组序列。Produces a sequence of tuples with elements from the two specified sequences.

Zip<TFirst,TSecond,TResult>(IEnumerable<TFirst>, IEnumerable<TSecond>, Func<TFirst,TSecond,TResult>)

将指定函数应用于两个序列的对应元素,以生成结果序列。Applies a specified function to the corresponding elements of two sequences, producing a sequence of the results.

AsParallel(IEnumerable)

启用查询的并行化。Enables parallelization of a query.

AsParallel<TSource>(IEnumerable<TSource>)

启用查询的并行化。Enables parallelization of a query.

AsQueryable(IEnumerable)

IEnumerable 转换为 IQueryableConverts an IEnumerable to an IQueryable.

AsQueryable<TElement>(IEnumerable<TElement>)

将泛型 IEnumerable<T> 转换为泛型 IQueryable<T>Converts a generic IEnumerable<T> to a generic IQueryable<T>.

Ancestors<T>(IEnumerable<T>)

返回元素集合,其中包含源集合中每个节点的上级。Returns a collection of elements that contains the ancestors of every node in the source collection.

Ancestors<T>(IEnumerable<T>, XName)

返回经过筛选的元素集合,其中包含源集合中每个节点的上级。Returns a filtered collection of elements that contains the ancestors of every node in the source collection. 集合中仅包括具有匹配 XName 的元素。Only elements that have a matching XName are included in the collection.

DescendantNodes<T>(IEnumerable<T>)

返回源集合中每个文档和元素的子代节点的集合。Returns a collection of the descendant nodes of every document and element in the source collection.

Descendants<T>(IEnumerable<T>)

返回元素集合,其中包含源集合中每个元素和文档的子代元素。Returns a collection of elements that contains the descendant elements of every element and document in the source collection.

Descendants<T>(IEnumerable<T>, XName)

返回经过筛选的元素集合,其中包含源集合中每个元素和文档的子代元素。Returns a filtered collection of elements that contains the descendant elements of every element and document in the source collection. 集合中仅包括具有匹配 XName 的元素。Only elements that have a matching XName are included in the collection.

Elements<T>(IEnumerable<T>)

返回源集合中每个元素和文档的子元素的集合。Returns a collection of the child elements of every element and document in the source collection.

Elements<T>(IEnumerable<T>, XName)

返回源集合中经过筛选的每个元素和文档的子元素集合。Returns a filtered collection of the child elements of every element and document in the source collection. 集合中仅包括具有匹配 XName 的元素。Only elements that have a matching XName are included in the collection.

InDocumentOrder<T>(IEnumerable<T>)

返回节点集合(其中包含源集合中的所有节点),并按文档顺序排列。Returns a collection of nodes that contains all nodes in the source collection, sorted in document order.

Nodes<T>(IEnumerable<T>)

返回源集合中每个文档和元素的子节点集合。Returns a collection of the child nodes of every document and element in the source collection.

Remove<T>(IEnumerable<T>)

将源集合中的每个节点从其父节点中移除。Removes every node in the source collection from its parent node.

适用于

线程安全性

Shared此类型) 成员 Visual Basic 的公共静态 (是线程安全的。Public static (Shared in Visual Basic) members of this type are thread safe. 但不保证所有实例成员都是线程安全的。Any instance members are not guaranteed to be thread safe.

Stack<T>只要不修改集合,就可以同时支持多个读取器。A Stack<T> can support multiple readers concurrently, as long as the collection is not modified. 尽管如此,枚举集合本身并不是一个线程安全的过程。Even so, enumerating through a collection is intrinsically not a thread-safe procedure. 若要确保枚举过程中的线程安全性,可以在整个枚举过程中锁定集合。To guarantee thread safety during enumeration, you can lock the collection during the entire enumeration. 若要允许多个线程访问集合以进行读写操作,则必须实现自己的同步。To allow the collection to be accessed by multiple threads for reading and writing, you must implement your own synchronization.

另请参阅