NameObjectCollectionBase.BaseGet 方法
定义
获取 NameObjectCollectionBase 实例中指定项的值。Gets the value of the specified entry from the NameObjectCollectionBase instance.
重载
BaseGet(Int32) |
获取 NameObjectCollectionBase 实例的指定索引处的项值。Gets the value of the entry at the specified index of the NameObjectCollectionBase instance. |
BaseGet(String) |
获取 NameObjectCollectionBase 实例中第一个具有指定键的项值。Gets the value of the first entry with the specified key from the NameObjectCollectionBase instance. |
BaseGet(Int32)
获取 NameObjectCollectionBase 实例的指定索引处的项值。Gets the value of the entry at the specified index of the NameObjectCollectionBase instance.
protected:
System::Object ^ BaseGet(int index);
protected object BaseGet (int index);
member this.BaseGet : int -> obj
Protected Function BaseGet (index As Integer) As Object
参数
- index
- Int32
要获取的值的从零开始索引。The zero-based index of the value to get.
返回
Object,它表示指定索引处的项值。An Object that represents the value of the entry at the specified index.
例外
index
超出了集合的有效索引范围。index
is outside the valid range of indexes for the collection.
示例
下面的代码示例使用 BaseGetKey 和 BaseGet 获取特定的键和值。The following code example uses BaseGetKey and BaseGet to get specific keys and values.
#using <System.dll>
using namespace System;
using namespace System::Collections;
using namespace System::Collections::Specialized;
public ref class MyCollection : public NameObjectCollectionBase {
private:
DictionaryEntry^ _de;
// Gets a key-and-value pair (DictionaryEntry) using an index.
public:
property DictionaryEntry^ default[ int ] {
DictionaryEntry^ get( int index ) {
_de->Key = this->BaseGetKey( index );
_de->Value = this->BaseGet( index );
return( _de );
}
}
// Gets or sets the value associated with the specified key.
property Object^ default[ String^ ] {
Object^ get(String^ key) {
return( this->BaseGet( key ) );
}
void set( String^ key, Object^ value ) {
this->BaseSet( key, value );
}
}
// Adds elements from an IDictionary into the new collection.
MyCollection( IDictionary^ d ) {
_de = gcnew DictionaryEntry();
for each ( DictionaryEntry^ de in d ) {
this->BaseAdd( (String^) de->Key, de->Value );
}
}
};
public ref class SamplesNameObjectCollectionBase {
public:
static void Main() {
// Creates and initializes a new MyCollection instance.
IDictionary^ d = gcnew ListDictionary();
d->Add( "red", "apple" );
d->Add( "yellow", "banana" );
d->Add( "green", "pear" );
MyCollection^ myCol = gcnew MyCollection( d );
Console::WriteLine( "Initial state of the collection (Count = {0}):", myCol->Count );
PrintKeysAndValues( myCol );
// Gets specific keys and values.
Console::WriteLine( "The key at index 0 is {0}.", myCol[0]->Key );
Console::WriteLine( "The value at index 0 is {0}.", myCol[0]->Value );
Console::WriteLine( "The value associated with the key \"green\" is {0}.", myCol["green"] );
}
static void PrintKeysAndValues( MyCollection^ myCol ) {
for ( int i = 0; i < myCol->Count; i++ ) {
Console::WriteLine( "[{0}] : {1}, {2}", i, myCol[i]->Key, myCol[i]->Value );
}
}
};
int main()
{
SamplesNameObjectCollectionBase::Main();
}
/*
This code produces the following output.
Initial state of the collection (Count = 3):
[0] : red, apple
[1] : yellow, banana
[2] : green, pear
The key at index 0 is red.
The value at index 0 is apple.
The value associated with the key "green" is pear.
*/
using System;
using System.Collections;
using System.Collections.Specialized;
public class MyCollection : NameObjectCollectionBase {
private DictionaryEntry _de = new DictionaryEntry();
// Gets a key-and-value pair (DictionaryEntry) using an index.
public DictionaryEntry this[ int index ] {
get {
_de.Key = this.BaseGetKey( index );
_de.Value = this.BaseGet( index );
return( _de );
}
}
// Gets or sets the value associated with the specified key.
public Object this[ String key ] {
get {
return( this.BaseGet( key ) );
}
set {
this.BaseSet( key, value );
}
}
// Adds elements from an IDictionary into the new collection.
public MyCollection( IDictionary d ) {
foreach ( DictionaryEntry de in d ) {
this.BaseAdd( (String) de.Key, de.Value );
}
}
}
public class SamplesNameObjectCollectionBase {
public static void Main() {
// Creates and initializes a new MyCollection instance.
IDictionary d = new ListDictionary();
d.Add( "red", "apple" );
d.Add( "yellow", "banana" );
d.Add( "green", "pear" );
MyCollection myCol = new MyCollection( d );
Console.WriteLine( "Initial state of the collection (Count = {0}):", myCol.Count );
PrintKeysAndValues( myCol );
// Gets specific keys and values.
Console.WriteLine( "The key at index 0 is {0}.", myCol[0].Key );
Console.WriteLine( "The value at index 0 is {0}.", myCol[0].Value );
Console.WriteLine( "The value associated with the key \"green\" is {0}.", myCol["green"] );
}
public static void PrintKeysAndValues( MyCollection myCol ) {
for ( int i = 0; i < myCol.Count; i++ ) {
Console.WriteLine( "[{0}] : {1}, {2}", i, myCol[i].Key, myCol[i].Value );
}
}
}
/*
This code produces the following output.
Initial state of the collection (Count = 3):
[0] : red, apple
[1] : yellow, banana
[2] : green, pear
The key at index 0 is red.
The value at index 0 is apple.
The value associated with the key "green" is pear.
*/
Imports System.Collections
Imports System.Collections.Specialized
Public Class MyCollection
Inherits NameObjectCollectionBase
Private _de As New DictionaryEntry()
' Gets a key-and-value pair (DictionaryEntry) using an index.
Default Public ReadOnly Property Item(index As Integer) As DictionaryEntry
Get
_de.Key = Me.BaseGetKey(index)
_de.Value = Me.BaseGet(index)
Return _de
End Get
End Property
' Gets or sets the value associated with the specified key.
Default Public Property Item(key As [String]) As [Object]
Get
Return Me.BaseGet(key)
End Get
Set
Me.BaseSet(key, value)
End Set
End Property
' Adds elements from an IDictionary into the new collection.
Public Sub New(d As IDictionary)
Dim de As DictionaryEntry
For Each de In d
Me.BaseAdd(CType(de.Key, [String]), de.Value)
Next de
End Sub
End Class
Public Class SamplesNameObjectCollectionBase
Public Shared Sub Main()
' Creates and initializes a new MyCollection instance.
Dim d = New ListDictionary()
d.Add("red", "apple")
d.Add("yellow", "banana")
d.Add("green", "pear")
Dim myCol As New MyCollection(d)
Console.WriteLine("Initial state of the collection (Count = {0}):", myCol.Count)
PrintKeysAndValues(myCol)
' Gets specific keys and values.
Console.WriteLine("The key at index 0 is {0}.", myCol(0).Key)
Console.WriteLine("The value at index 0 is {0}.", myCol(0).Value)
Console.WriteLine("The value associated with the key ""green"" is {0}.", myCol("green"))
End Sub
Public Shared Sub PrintKeysAndValues(myCol As MyCollection)
Dim i As Integer
For i = 0 To myCol.Count - 1
Console.WriteLine("[{0}] : {1}, {2}", i, myCol(i).Key, myCol(i).Value)
Next i
End Sub
End Class
'This code produces the following output.
'
'Initial state of the collection (Count = 3):
'[0] : red, apple
'[1] : yellow, banana
'[2] : green, pear
'The key at index 0 is red.
'The value at index 0 is apple.
'The value associated with the key "green" is pear.
注解
此方法是 O (1) 操作。This method is an O(1) operation.
适用于
BaseGet(String)
获取 NameObjectCollectionBase 实例中第一个具有指定键的项值。Gets the value of the first entry with the specified key from the NameObjectCollectionBase instance.
protected:
System::Object ^ BaseGet(System::String ^ name);
protected object BaseGet (string name);
member this.BaseGet : string -> obj
Protected Function BaseGet (name As String) As Object
参数
返回
如果找到了表示第一个具有指定键的项值的 Object,则为该对象;否则为 null
。An Object that represents the value of the first entry with the specified key, if found; otherwise, null
.
示例
下面的代码示例使用 BaseGetKey 和 BaseGet 获取特定的键和值。The following code example uses BaseGetKey and BaseGet to get specific keys and values.
#using <System.dll>
using namespace System;
using namespace System::Collections;
using namespace System::Collections::Specialized;
public ref class MyCollection : public NameObjectCollectionBase {
private:
DictionaryEntry^ _de;
// Gets a key-and-value pair (DictionaryEntry) using an index.
public:
property DictionaryEntry^ default[ int ] {
DictionaryEntry^ get( int index ) {
_de->Key = this->BaseGetKey( index );
_de->Value = this->BaseGet( index );
return( _de );
}
}
// Gets or sets the value associated with the specified key.
property Object^ default[ String^ ] {
Object^ get(String^ key) {
return( this->BaseGet( key ) );
}
void set( String^ key, Object^ value ) {
this->BaseSet( key, value );
}
}
// Adds elements from an IDictionary into the new collection.
MyCollection( IDictionary^ d ) {
_de = gcnew DictionaryEntry();
for each ( DictionaryEntry^ de in d ) {
this->BaseAdd( (String^) de->Key, de->Value );
}
}
};
public ref class SamplesNameObjectCollectionBase {
public:
static void Main() {
// Creates and initializes a new MyCollection instance.
IDictionary^ d = gcnew ListDictionary();
d->Add( "red", "apple" );
d->Add( "yellow", "banana" );
d->Add( "green", "pear" );
MyCollection^ myCol = gcnew MyCollection( d );
Console::WriteLine( "Initial state of the collection (Count = {0}):", myCol->Count );
PrintKeysAndValues( myCol );
// Gets specific keys and values.
Console::WriteLine( "The key at index 0 is {0}.", myCol[0]->Key );
Console::WriteLine( "The value at index 0 is {0}.", myCol[0]->Value );
Console::WriteLine( "The value associated with the key \"green\" is {0}.", myCol["green"] );
}
static void PrintKeysAndValues( MyCollection^ myCol ) {
for ( int i = 0; i < myCol->Count; i++ ) {
Console::WriteLine( "[{0}] : {1}, {2}", i, myCol[i]->Key, myCol[i]->Value );
}
}
};
int main()
{
SamplesNameObjectCollectionBase::Main();
}
/*
This code produces the following output.
Initial state of the collection (Count = 3):
[0] : red, apple
[1] : yellow, banana
[2] : green, pear
The key at index 0 is red.
The value at index 0 is apple.
The value associated with the key "green" is pear.
*/
using System;
using System.Collections;
using System.Collections.Specialized;
public class MyCollection : NameObjectCollectionBase {
private DictionaryEntry _de = new DictionaryEntry();
// Gets a key-and-value pair (DictionaryEntry) using an index.
public DictionaryEntry this[ int index ] {
get {
_de.Key = this.BaseGetKey( index );
_de.Value = this.BaseGet( index );
return( _de );
}
}
// Gets or sets the value associated with the specified key.
public Object this[ String key ] {
get {
return( this.BaseGet( key ) );
}
set {
this.BaseSet( key, value );
}
}
// Adds elements from an IDictionary into the new collection.
public MyCollection( IDictionary d ) {
foreach ( DictionaryEntry de in d ) {
this.BaseAdd( (String) de.Key, de.Value );
}
}
}
public class SamplesNameObjectCollectionBase {
public static void Main() {
// Creates and initializes a new MyCollection instance.
IDictionary d = new ListDictionary();
d.Add( "red", "apple" );
d.Add( "yellow", "banana" );
d.Add( "green", "pear" );
MyCollection myCol = new MyCollection( d );
Console.WriteLine( "Initial state of the collection (Count = {0}):", myCol.Count );
PrintKeysAndValues( myCol );
// Gets specific keys and values.
Console.WriteLine( "The key at index 0 is {0}.", myCol[0].Key );
Console.WriteLine( "The value at index 0 is {0}.", myCol[0].Value );
Console.WriteLine( "The value associated with the key \"green\" is {0}.", myCol["green"] );
}
public static void PrintKeysAndValues( MyCollection myCol ) {
for ( int i = 0; i < myCol.Count; i++ ) {
Console.WriteLine( "[{0}] : {1}, {2}", i, myCol[i].Key, myCol[i].Value );
}
}
}
/*
This code produces the following output.
Initial state of the collection (Count = 3):
[0] : red, apple
[1] : yellow, banana
[2] : green, pear
The key at index 0 is red.
The value at index 0 is apple.
The value associated with the key "green" is pear.
*/
Imports System.Collections
Imports System.Collections.Specialized
Public Class MyCollection
Inherits NameObjectCollectionBase
Private _de As New DictionaryEntry()
' Gets a key-and-value pair (DictionaryEntry) using an index.
Default Public ReadOnly Property Item(index As Integer) As DictionaryEntry
Get
_de.Key = Me.BaseGetKey(index)
_de.Value = Me.BaseGet(index)
Return _de
End Get
End Property
' Gets or sets the value associated with the specified key.
Default Public Property Item(key As [String]) As [Object]
Get
Return Me.BaseGet(key)
End Get
Set
Me.BaseSet(key, value)
End Set
End Property
' Adds elements from an IDictionary into the new collection.
Public Sub New(d As IDictionary)
Dim de As DictionaryEntry
For Each de In d
Me.BaseAdd(CType(de.Key, [String]), de.Value)
Next de
End Sub
End Class
Public Class SamplesNameObjectCollectionBase
Public Shared Sub Main()
' Creates and initializes a new MyCollection instance.
Dim d = New ListDictionary()
d.Add("red", "apple")
d.Add("yellow", "banana")
d.Add("green", "pear")
Dim myCol As New MyCollection(d)
Console.WriteLine("Initial state of the collection (Count = {0}):", myCol.Count)
PrintKeysAndValues(myCol)
' Gets specific keys and values.
Console.WriteLine("The key at index 0 is {0}.", myCol(0).Key)
Console.WriteLine("The value at index 0 is {0}.", myCol(0).Value)
Console.WriteLine("The value associated with the key ""green"" is {0}.", myCol("green"))
End Sub
Public Shared Sub PrintKeysAndValues(myCol As MyCollection)
Dim i As Integer
For i = 0 To myCol.Count - 1
Console.WriteLine("[{0}] : {1}, {2}", i, myCol(i).Key, myCol(i).Value)
Next i
End Sub
End Class
'This code produces the following output.
'
'Initial state of the collection (Count = 3):
'[0] : red, apple
'[1] : yellow, banana
'[2] : green, pear
'The key at index 0 is red.
'The value at index 0 is apple.
'The value associated with the key "green" is pear.
注解
如果集合包含多个具有指定键的项,则此方法只返回第一个项。If the collection contains multiple entries with the specified key, this method returns only the first entry. 若要获取具有相同键的后续项的值,请使用枚举器循环访问集合并比较键。To get the values of subsequent entries with the same key, use the enumerator to iterate through the collection and compare the keys.
注意
如果找不到指定的键,则此方法 null
在以下情况下返回: 1) ; 如果找到指定的键,则为 2) ; 如果找到指定的值,则为 2 null
。This method returns null
in the following cases: 1) if the specified key is not found; and 2) if the specified key is found and its associated value is null
. 此方法不区分这两种情况。This method does not distinguish between the two cases.
此方法是 O (1) 操作。This method is an O(1) operation.