List<T>.InsertRange(Int32, IEnumerable<T>) 方法
定义
public:
void InsertRange(int index, System::Collections::Generic::IEnumerable<T> ^ collection);
public void InsertRange (int index, System.Collections.Generic.IEnumerable<T> collection);
member this.InsertRange : int * seq<'T> -> unit
Public Sub InsertRange (index As Integer, collection As IEnumerable(Of T))
参数
- index
- Int32
应在此处插入新元素的从零开始的索引。The zero-based index at which the new elements should be inserted.
- collection
- IEnumerable<T>
应将其元素插入到 List<T> 中的集合。The collection whose elements should be inserted into the List<T>. 集合自身不能为 null
,但它可以包含为 null
的元素(如果类型 T
为引用类型)。The collection itself cannot be null
, but it can contain elements that are null
, if type T
is a reference type.
例外
collection
为 null
。collection
is null
.
index
小于 0。index
is less than 0.
示例
下面的示例演示了 InsertRange 对范围执行操作的类的方法和各种其他方法 List<T> 。The following example demonstrates InsertRange method and various other methods of the List<T> class that act on ranges. 创建列表并使用多个平静植物恐龙的名称填充后,该 InsertRange 方法用于将三个 ferocious 肉恐龙的数组插入到列表中,从索引位置3开始。After the list has been created and populated with the names of several peaceful plant-eating dinosaurs, the InsertRange method is used to insert an array of three ferocious meat-eating dinosaurs into the list, beginning at index location 3.
using namespace System;
using namespace System::Collections::Generic;
void main()
{
array<String^>^ input = { "Brachiosaurus",
"Amargasaurus",
"Mamenchisaurus" };
List<String^>^ dinosaurs =
gcnew List<String^>((IEnumerable<String^>^) input);
Console::WriteLine("\nCapacity: {0}", dinosaurs->Capacity);
Console::WriteLine();
for each(String^ dinosaur in dinosaurs )
{
Console::WriteLine(dinosaur);
}
Console::WriteLine("\nAddRange(dinosaurs)");
dinosaurs->AddRange(dinosaurs);
Console::WriteLine();
for each(String^ dinosaur in dinosaurs )
{
Console::WriteLine(dinosaur);
}
Console::WriteLine("\nRemoveRange(2, 2)");
dinosaurs->RemoveRange(2, 2);
Console::WriteLine();
for each(String^ dinosaur in dinosaurs )
{
Console::WriteLine(dinosaur);
}
input = gcnew array<String^> { "Tyrannosaurus",
"Deinonychus",
"Velociraptor"};
Console::WriteLine("\nInsertRange(3, (IEnumerable<String^>^) input)");
dinosaurs->InsertRange(3, (IEnumerable<String^>^) input);
Console::WriteLine();
for each(String^ dinosaur in dinosaurs )
{
Console::WriteLine(dinosaur);
}
Console::WriteLine("\noutput = dinosaurs->GetRange(2, 3)->ToArray()");
array<String^>^ output = dinosaurs->GetRange(2, 3)->ToArray();
Console::WriteLine();
for each(String^ dinosaur in output )
{
Console::WriteLine(dinosaur);
}
}
/* This code example produces the following output:
Capacity: 3
Brachiosaurus
Amargasaurus
Mamenchisaurus
AddRange(dinosaurs)
Brachiosaurus
Amargasaurus
Mamenchisaurus
Brachiosaurus
Amargasaurus
Mamenchisaurus
RemoveRange(2, 2)
Brachiosaurus
Amargasaurus
Amargasaurus
Mamenchisaurus
InsertRange(3, (IEnumerable<String^>^) input)
Brachiosaurus
Amargasaurus
Amargasaurus
Tyrannosaurus
Deinonychus
Velociraptor
Mamenchisaurus
output = dinosaurs->GetRange(2, 3)->ToArray()
Amargasaurus
Tyrannosaurus
Deinonychus
*/
using System;
using System.Collections.Generic;
public class Example
{
public static void Main()
{
string[] input = { "Brachiosaurus",
"Amargasaurus",
"Mamenchisaurus" };
List<string> dinosaurs = new List<string>(input);
Console.WriteLine("\nCapacity: {0}", dinosaurs.Capacity);
Console.WriteLine();
foreach( string dinosaur in dinosaurs )
{
Console.WriteLine(dinosaur);
}
Console.WriteLine("\nAddRange(dinosaurs)");
dinosaurs.AddRange(dinosaurs);
Console.WriteLine();
foreach( string dinosaur in dinosaurs )
{
Console.WriteLine(dinosaur);
}
Console.WriteLine("\nRemoveRange(2, 2)");
dinosaurs.RemoveRange(2, 2);
Console.WriteLine();
foreach( string dinosaur in dinosaurs )
{
Console.WriteLine(dinosaur);
}
input = new string[] { "Tyrannosaurus",
"Deinonychus",
"Velociraptor"};
Console.WriteLine("\nInsertRange(3, input)");
dinosaurs.InsertRange(3, input);
Console.WriteLine();
foreach( string dinosaur in dinosaurs )
{
Console.WriteLine(dinosaur);
}
Console.WriteLine("\noutput = dinosaurs.GetRange(2, 3).ToArray()");
string[] output = dinosaurs.GetRange(2, 3).ToArray();
Console.WriteLine();
foreach( string dinosaur in output )
{
Console.WriteLine(dinosaur);
}
}
}
/* This code example produces the following output:
Capacity: 3
Brachiosaurus
Amargasaurus
Mamenchisaurus
AddRange(dinosaurs)
Brachiosaurus
Amargasaurus
Mamenchisaurus
Brachiosaurus
Amargasaurus
Mamenchisaurus
RemoveRange(2, 2)
Brachiosaurus
Amargasaurus
Amargasaurus
Mamenchisaurus
InsertRange(3, input)
Brachiosaurus
Amargasaurus
Amargasaurus
Tyrannosaurus
Deinonychus
Velociraptor
Mamenchisaurus
output = dinosaurs.GetRange(2, 3).ToArray()
Amargasaurus
Tyrannosaurus
Deinonychus
*/
Imports System.Collections.Generic
Public Class Example
Public Shared Sub Main()
Dim input() As String = { "Brachiosaurus", _
"Amargasaurus", _
"Mamenchisaurus" }
Dim dinosaurs As New List(Of String)(input)
Console.WriteLine(vbLf & "Capacity: {0}", dinosaurs.Capacity)
Console.WriteLine()
For Each dinosaur As String In dinosaurs
Console.WriteLine(dinosaur)
Next
Console.WriteLine(vbLf & "AddRange(dinosaurs)")
dinosaurs.AddRange(dinosaurs)
Console.WriteLine()
For Each dinosaur As String In dinosaurs
Console.WriteLine(dinosaur)
Next
Console.WriteLine(vbLf & "RemoveRange(2, 2)")
dinosaurs.RemoveRange(2, 2)
Console.WriteLine()
For Each dinosaur As String In dinosaurs
Console.WriteLine(dinosaur)
Next
input = New String() { "Tyrannosaurus", _
"Deinonychus", _
"Velociraptor" }
Console.WriteLine(vbLf & "InsertRange(3, input)")
dinosaurs.InsertRange(3, input)
Console.WriteLine()
For Each dinosaur As String In dinosaurs
Console.WriteLine(dinosaur)
Next
Console.WriteLine(vbLf & "output = dinosaurs.GetRange(2, 3).ToArray")
Dim output() As String = dinosaurs.GetRange(2, 3).ToArray()
Console.WriteLine()
For Each dinosaur As String In output
Console.WriteLine(dinosaur)
Next
End Sub
End Class
' This code example produces the following output:
'
'Capacity: 3
'
'Brachiosaurus
'Amargasaurus
'Mamenchisaurus
'
'AddRange(dinosaurs)
'
'Brachiosaurus
'Amargasaurus
'Mamenchisaurus
'Brachiosaurus
'Amargasaurus
'Mamenchisaurus
'
'RemoveRange(2, 2)
'
'Brachiosaurus
'Amargasaurus
'Amargasaurus
'Mamenchisaurus
'
'InsertRange(3, input)
'
'Brachiosaurus
'Amargasaurus
'Amargasaurus
'Tyrannosaurus
'Deinonychus
'Velociraptor
'Mamenchisaurus
'
'output = dinosaurs.GetRange(2, 3).ToArray
'
'Amargasaurus
'Tyrannosaurus
'Deinonychus
注解
List<T> 接受 null
作为引用类型的有效值,并允许重复元素。List<T> accepts null
as a valid value for reference types and allows duplicate elements.
如果新 Count (当前 Count 加上集合的大小) 将大于 Capacity ,则 List<T> 通过自动重新分配内部数组以容纳新元素,并将现有元素复制到新数组中,然后再添加新元素。If the new Count (the current Count plus the size of the collection) will be greater than Capacity, the capacity of the List<T> is increased by automatically reallocating the internal array to accommodate the new elements, and the existing elements are copied to the new array before the new elements are added.
如果 index
等于 Count ,则将元素添加到的末尾 List<T> 。If index
is equal to Count, the elements are added to the end of List<T>.
集合中元素的顺序保留在中 List<T> 。The order of the elements in the collection is preserved in the List<T>.
此方法是一个 O (n * m) 操作,其中 n 是要添加的元素的数目, m 为 Count 。This method is an O(n * m) operation, where n is the number of elements to be added and m is Count.