NameObjectCollectionBase.BaseSet 方法

定义

命名空间:

System.Collections.Specialized

程序集:

System.Collections.Specialized.dll

设置 NameObjectCollectionBase 实例中的项值。

重载

BaseSet(Int32, Object)	设置 NameObjectCollectionBase 实例的指定索引处的项值。
BaseSet(String, Object)	为 NameObjectCollectionBase 实例中第一个具有指定键的项设置值（如果有这样的项）；否则将具有指定键和值的项添加到 NameObjectCollectionBase 实例中。

示例

下面的代码示例使用 BaseSet 设置特定元素的值。

#using <System.dll>
using namespace System;
using namespace System::Collections;
using namespace System::Collections::Specialized;

public ref class MyCollection : public NameObjectCollectionBase  {

   // Gets or sets the value at the specified index.
public:
   property Object^ default[ int ]  {
      Object^ get(int index)  {
         return( this->BaseGet( index ) );
      }
      void set( int index, Object^ value )  {
         this->BaseSet( index, value );
      }
   }

   // 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 );
      }
   }

   // Gets a String array that contains all the keys in the collection.
   property array<String^>^ AllKeys  {
      array<String^>^ get()  {
         return( this->BaseGetAllKeys() );
      }
   }

   // Adds elements from an IDictionary into the new collection.
   MyCollection( IDictionary^ d )  {
      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:" );
      PrintKeysAndValues2( myCol );
      Console::WriteLine();

      // Sets the value at index 1.
      myCol[1] = "sunflower";
      Console::WriteLine( "After setting the value at index 1:" );
      PrintKeysAndValues2( myCol );
      Console::WriteLine();

      // Sets the value associated with the key "red".
      myCol["red"] = "tulip";
      Console::WriteLine( "After setting the value associated with the key \"red\":" );
      PrintKeysAndValues2( myCol );

   }

   static void PrintKeysAndValues2( MyCollection^ myCol )  {
      for each ( String^ s in myCol->AllKeys )  {
         Console::WriteLine( "{0}, {1}", s, myCol[s] );
      }
   }
};

int main()
{
    SamplesNameObjectCollectionBase::Main();
}

/*
This code produces the following output.

Initial state of the collection:
red, apple
yellow, banana
green, pear

After setting the value at index 1:
red, apple
yellow, sunflower
green, pear

After setting the value associated with the key "red":
red, tulip
yellow, sunflower
green, pear

*/

using System;
using System.Collections;
using System.Collections.Specialized;

public class MyCollection : NameObjectCollectionBase  {

   // Gets or sets the value at the specified index.
   public Object this[ int index ]  {
      get  {
         return( this.BaseGet( index ) );
      }
      set  {
         this.BaseSet( index, value );
      }
   }

   // 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 );
      }
   }

   // Gets a String array that contains all the keys in the collection.
   public String[] AllKeys  {
      get  {
         return( this.BaseGetAllKeys() );
      }
   }

   // 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:" );
      PrintKeysAndValues2( myCol );
      Console.WriteLine();

      // Sets the value at index 1.
      myCol[1] = "sunflower";
      Console.WriteLine( "After setting the value at index 1:" );
      PrintKeysAndValues2( myCol );
      Console.WriteLine();

      // Sets the value associated with the key "red".
      myCol["red"] = "tulip";
      Console.WriteLine( "After setting the value associated with the key \"red\":" );
      PrintKeysAndValues2( myCol );
   }

   public static void PrintKeysAndValues2( MyCollection myCol )  {
      foreach ( String s in myCol.AllKeys )  {
         Console.WriteLine( "{0}, {1}", s, myCol[s] );
      }
   }
}


/*
This code produces the following output.

Initial state of the collection:
red, apple
yellow, banana
green, pear

After setting the value at index 1:
red, apple
yellow, sunflower
green, pear

After setting the value associated with the key "red":
red, tulip
yellow, sunflower
green, pear

*/

Imports System.Collections
Imports System.Collections.Specialized

Public Class MyCollection
   Inherits NameObjectCollectionBase

   ' Gets or sets the value at the specified index.
   Default Public Property Item(index As Integer) As [Object]
      Get
         Return Me.BaseGet(index)
      End Get
      Set
         Me.BaseSet(index, value)
      End Set
   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

   ' Gets a String array that contains all the keys in the collection.
   Public ReadOnly Property AllKeys() As [String]()
      Get
         Return Me.BaseGetAllKeys()
      End Get
   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:")
      PrintKeysAndValues2(myCol)
      Console.WriteLine()

      ' Sets the value at index 1.
      myCol(1) = "sunflower"
      Console.WriteLine("After setting the value at index 1:")
      PrintKeysAndValues2(myCol)
      Console.WriteLine()

      ' Sets the value associated with the key "red".
      myCol("red") = "tulip"
      Console.WriteLine("After setting the value associated with the key ""red"":")
      PrintKeysAndValues2(myCol)

   End Sub

   Public Shared Sub PrintKeysAndValues2(myCol As MyCollection)
      Dim s As [String]
      For Each s In  myCol.AllKeys
         Console.WriteLine("{0}, {1}", s, myCol(s))
      Next s
   End Sub

End Class


'This code produces the following output.
'
'Initial state of the collection:
'red, apple
'yellow, banana
'green, pear
'
'After setting the value at index 1:
'red, apple
'yellow, sunflower
'green, pear
'
'After setting the value associated with the key "red":
'red, tulip
'yellow, sunflower
'green, pear

BaseSet(Int32, Object)

Source:

NameObjectCollectionBase.cs

设置 NameObjectCollectionBase 实例的指定索引处的项值。

protected:
 void BaseSet(int index, System::Object ^ value);

protected void BaseSet (int index, object? value);

member this.BaseSet : int * obj -> unit

Protected Sub BaseSet (index As Integer, value As Object)

参数

index

Int32

要设置的条目的从零开始的索引。

value

Object

表示要设置的项的新值的 Object。 该值可以为 null。

例外

NotSupportedException

该集合是只读的。

ArgumentOutOfRangeException

index 超出了集合的有效索引范围。

注解

此方法是 O (1) 操作。

另请参阅

• 执行不区分区域性的字符串操作

BaseSet(String, Object)

Source:

NameObjectCollectionBase.cs

为 NameObjectCollectionBase 实例中第一个具有指定键的项设置值（如果有这样的项）；否则将具有指定键和值的项添加到 NameObjectCollectionBase 实例中。

protected:
 void BaseSet(System::String ^ name, System::Object ^ value);

protected void BaseSet (string? name, object? value);

member this.BaseSet : string * obj -> unit

Protected Sub BaseSet (name As String, value As Object)

参数

name

String

要设置的项的 String 键。 键可以是 null。

value

Object

表示要设置的项的新值的 Object。 该值可以为 null。

例外

NotSupportedException

该集合是只读的。

注解

如果集合包含具有指定键的多个条目，则此方法仅设置第一个条目。 若要设置具有相同键的后续条目的值，请使用 枚举器循环访问集合并比较键。

此方法是 O (1) 操作。

另请参阅

• GetEnumerator()
• 执行不区分区域性的字符串操作