StringCollection.Remove(String) 方法
定义
重要
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从中 StringCollection删除特定字符串的第一个匹配项。
public:
void Remove(System::String ^ value);public void Remove(string value);public void Remove(string? value);member this.Remove : string -> unitPublic Sub Remove (value As String)参数
- value
- String
要从 . 中删除的 StringCollection字符串 该值可以是 null。
示例
下面的代码示例从中 StringCollection删除元素。
using System;
using System.Collections;
using System.Collections.Specialized;
public class SamplesStringCollection {
public static void Main() {
// Creates and initializes a new StringCollection.
StringCollection myCol = new StringCollection();
String[] myArr = new String[] { "RED", "orange", "yellow", "RED", "green", "blue", "RED", "indigo", "violet", "RED" };
myCol.AddRange( myArr );
Console.WriteLine( "Initial contents of the StringCollection:" );
PrintValues( myCol );
// Removes one element from the StringCollection.
myCol.Remove( "yellow" );
Console.WriteLine( "After removing \"yellow\":" );
PrintValues( myCol );
// Removes all occurrences of a value from the StringCollection.
int i = myCol.IndexOf( "RED" );
while ( i > -1 ) {
myCol.RemoveAt( i );
i = myCol.IndexOf( "RED" );
}
Console.WriteLine( "After removing all occurrences of \"RED\":" );
PrintValues( myCol );
// Clears the entire collection.
myCol.Clear();
Console.WriteLine( "After clearing the collection:" );
PrintValues( myCol );
}
public static void PrintValues( IEnumerable myCol ) {
foreach ( Object obj in myCol )
Console.WriteLine( " {0}", obj );
Console.WriteLine();
}
}
/*
This code produces the following output.
Initial contents of the StringCollection:
RED
orange
yellow
RED
green
blue
RED
indigo
violet
RED
After removing "yellow":
RED
orange
RED
green
blue
RED
indigo
violet
RED
After removing all occurrences of "RED":
orange
green
blue
indigo
violet
After clearing the collection:
*/
Imports System.Collections
Imports System.Collections.Specialized
Public Class SamplesStringCollection
Public Shared Sub Main()
' Creates and initializes a new StringCollection.
Dim myCol As New StringCollection()
Dim myArr() As [String] = {"RED", "orange", "yellow", "RED", "green", "blue", "RED", "indigo", "violet", "RED"}
myCol.AddRange(myArr)
Console.WriteLine("Initial contents of the StringCollection:")
PrintValues(myCol)
' Removes one element from the StringCollection.
myCol.Remove("yellow")
Console.WriteLine("After removing ""yellow"":")
PrintValues(myCol)
' Removes all occurrences of a value from the StringCollection.
Dim i As Integer = myCol.IndexOf("RED")
While i > - 1
myCol.RemoveAt(i)
i = myCol.IndexOf("RED")
End While
Console.WriteLine("After removing all occurrences of ""RED"":")
PrintValues(myCol)
' Clears the entire collection.
myCol.Clear()
Console.WriteLine("After clearing the collection:")
PrintValues(myCol)
End Sub
Public Shared Sub PrintValues(myCol As IEnumerable)
Dim obj As [Object]
For Each obj In myCol
Console.WriteLine(" {0}", obj)
Next obj
Console.WriteLine()
End Sub
End Class
'This code produces the following output.
'
'Initial contents of the StringCollection:
' RED
' orange
' yellow
' RED
' green
' blue
' RED
' indigo
' violet
' RED
'
'After removing "yellow":
' RED
' orange
' RED
' green
' blue
' RED
' indigo
' violet
' RED
'
'After removing all occurrences of "RED":
' orange
' green
' blue
' indigo
' violet
'
'After clearing the collection:
'
注解
允许在 . 中 StringCollection重复字符串。 仅删除第一个匹配项。 若要删除指定字符串的所有匹配项，请重复使用 RemoveAt(IndexOf(value)) ，同时 IndexOf 不返回 -1。
StringCollection如果不包含指定的对象，则StringCollection保持不变。 不会引发异常。
在连续元素（如列表）的集合中，已删除元素后面的元素向上移动以占据空置的位置。 如果为集合编制索引，则移动的元素的索引也会更新。 此行为不适用于在概念上将元素分组到存储桶中的集合，例如哈希表。
此方法通过调用 Object.Equals确定相等性。 字符串比较区分大小写。
此方法执行线性搜索;因此，此方法是 O（n） 操作，其中 n 。Count
