I have been posting this question with no success. I do not know if I
am not being clear of the question is too difficult :-)) or unclear.
It seems to me that the need to wrap a collection is quite common in
real world programs.
I am having problem to understand how I can wrap collections in
System.Collections.Generic.
For example I want to wrap a System.Collections.Generic.Dictionary. I
wish the wrapping class to have a constructor similar to that of the
dictionary (besides some possible other argument).
I think it should be actually simple, but I cannot see the right
syntax to implement this idea. Could anyone suggest how ?
Intuitively I want something "like" (please * excuse me * if I use the
VB notation, which I am familiar with, I will have no problem to
understand any C# solution to my question )
'------------------------------------
Class DictionaryWrapper
Public Whatever As WhateverObject
Public MyDict As System.Collections.Generic.Dictionary(Of
MyObjectType1, MyObjectType2)(MyComparer)
Sub New(ByVal MyObjectType1 as type?, ByVal MyObjectType2 as
type?, ByVal MyComparer as IComparer , ByVal WhateverObj as
WhateverObject )
Me.MyDict = New System.Collections.Generic.Dictionary(Of
MyObjectType1, MyObjectType2)(MyComparer)
Me.Whatever = WhateverObj
End Sub
End Class
'------------------------------------
Thanks
-Pam 5 4650
Hi Pamela,
here's a small sample based on what I could understand from your
requirements:
using System;
using System.Collections.Generic;
using System.Windows.Forms;
namespace WindowsApplication1
{
class DictionaryWrapper<Key, Value>
{
private Dictionary<Key, Valuem_dict = new Dictionary<Key,
Value>();
public Value this[Key key]
{
get
{
return m_dict[key];
}
set
{
m_dict[key] = value;
}
}
// Define whatever other public methods you need that utilize
m_dict.
}
static class Program
{
/// <summary>
/// The main entry point for the application.
/// </summary>
[STAThread]
static void Main()
{
DictionaryWrapper<string, intwrapper = new
DictionaryWrapper<string, int>();
wrapper["key1"] = 10;
wrapper["key2"] = 15;
Console.WriteLine( "Sum of values = " + ( wrapper["key1"] +
wrapper["key2"] ) );
}
}
}
"pamela fluente" <pa***********@libero.itwrote in message
news:11**********************@a75g2000cwd.googlegr oups.com...
>I have been posting this question with no success. I do not know if I
am not being clear of the question is too difficult :-)) or unclear.
It seems to me that the need to wrap a collection is quite common in
real world programs.
I am having problem to understand how I can wrap collections in
System.Collections.Generic.
For example I want to wrap a System.Collections.Generic.Dictionary. I
wish the wrapping class to have a constructor similar to that of the
dictionary (besides some possible other argument).
I think it should be actually simple, but I cannot see the right
syntax to implement this idea. Could anyone suggest how ?
Intuitively I want something "like" (please * excuse me * if I use the
VB notation, which I am familiar with, I will have no problem to
understand any C# solution to my question )
'------------------------------------
Class DictionaryWrapper
Public Whatever As WhateverObject
Public MyDict As System.Collections.Generic.Dictionary(Of
MyObjectType1, MyObjectType2)(MyComparer)
Sub New(ByVal MyObjectType1 as type?, ByVal MyObjectType2 as
type?, ByVal MyComparer as IComparer , ByVal WhateverObj as
WhateverObject )
Me.MyDict = New System.Collections.Generic.Dictionary(Of
MyObjectType1, MyObjectType2)(MyComparer)
Me.Whatever = WhateverObj
End Sub
End Class
'------------------------------------
Thanks
-Pam
On 9 Feb, 20:53, "Ashot Geodakov" <a_geoda...@hotmail.comwrote:
Hi Pamela,
here's a small sample based on what I could understand from your
requirements:
using System;
using System.Collections.Generic;
using System.Windows.Forms;
namespace WindowsApplication1
{
class DictionaryWrapper<Key, Value>
{
private Dictionary<Key, Valuem_dict = new Dictionary<Key,
Value>();
Thanks Ashot .
My problem is I do not know how to pass the types that are declared
externally (as parameters for the wrapper constructor)
for the Key and the Value to the internal typed dictionary
System.Collections.Generic.Dictionary(Of MyObjectType1, MyObjectType2)
(MyComparer)
I do not see any type declaration in your code. I am not sure
whether you have provided
the answer to what I was looking for ...
Perhaps c# and vb are too different here or I do not get it ...
mmm I am having hard time with this one.
Anyone more suggestions ?
-Pam
Pam,
To add to the previous post here is a C# example that shows how to inherit
of the generic dictionary collection as opposed to aggregating the generic
collection
public class MyCustomDictionary<TKey, TValue: Dictionary<TKey, TValue>
{
public MyCustomDictionary() : base()
{
}
public MyCustomDictionary(MyCustomDictionary<TKey, TValue>
myCustomDictionary) : base()
{
if (myCustomDictionary == null)
return;
MyCustomDictionary<TKey, TValue>.Enumerator enumDictionary =
myCustomDictionary.GetEnumerator();
while (enumDictionary.MoveNext())
base.Add(enumDictionary.Current.Key,
enumDictionary.Current.Value);
}
public void DoMyStuff()
{
}
}
HTH
Ollie Riches
"Ashot Geodakov" <a_********@hotmail.comwrote in message
news:e3**************@TK2MSFTNGP02.phx.gbl...
Hi Pamela,
here's a small sample based on what I could understand from your
requirements:
using System;
using System.Collections.Generic;
using System.Windows.Forms;
namespace WindowsApplication1
{
class DictionaryWrapper<Key, Value>
{
private Dictionary<Key, Valuem_dict = new Dictionary<Key,
Value>();
public Value this[Key key]
{
get
{
return m_dict[key];
}
set
{
m_dict[key] = value;
}
}
// Define whatever other public methods you need that utilize
m_dict.
}
static class Program
{
/// <summary>
/// The main entry point for the application.
/// </summary>
[STAThread]
static void Main()
{
DictionaryWrapper<string, intwrapper = new
DictionaryWrapper<string, int>();
wrapper["key1"] = 10;
wrapper["key2"] = 15;
Console.WriteLine( "Sum of values = " + ( wrapper["key1"] +
wrapper["key2"] ) );
}
}
}
"pamela fluente" <pa***********@libero.itwrote in message
news:11**********************@a75g2000cwd.googlegr oups.com...
>>I have been posting this question with no success. I do not know if I am not being clear of the question is too difficult :-)) or unclear. It seems to me that the need to wrap a collection is quite common in real world programs.
I am having problem to understand how I can wrap collections in System.Collections.Generic. For example I want to wrap a System.Collections.Generic.Dictionary. I wish the wrapping class to have a constructor similar to that of the dictionary (besides some possible other argument).
I think it should be actually simple, but I cannot see the right syntax to implement this idea. Could anyone suggest how ?
Intuitively I want something "like" (please * excuse me * if I use the VB notation, which I am familiar with, I will have no problem to understand any C# solution to my question )
'------------------------------------ Class DictionaryWrapper
Public Whatever As WhateverObject
Public MyDict As System.Collections.Generic.Dictionary(Of MyObjectType1, MyObjectType2)(MyComparer)
Sub New(ByVal MyObjectType1 as type?, ByVal MyObjectType2 as type?, ByVal MyComparer as IComparer , ByVal WhateverObj as WhateverObject )
Me.MyDict = New System.Collections.Generic.Dictionary(Of MyObjectType1, MyObjectType2)(MyComparer)
Me.Whatever = WhateverObj
End Sub
End Class '------------------------------------
Thanks
-Pam
On 9 Feb, 21:43, "Ollie Riches" <ollie_ric...@hotmail.comwrote:
Pam,
Thank you Ollie , Thanks Ashot
finally I got it. Ashot code is what I was looking for. I was missing
the possibility to indicate the type after the class keyword. Here it
is in vb:
Imports System.Collections.Generic
Public Class Form1
Private Class DictionaryWrapper(Of Key, Value)
Private m_dict As New Dictionary(Of Key, Value)()
Default Public Property Item(ByVal key As Key) As Value
Get
Return m_dict(key)
End Get
Set(ByVal value As Value)
m_dict(key) = value
End Set
End Property
' Define whatever other public methods you need that utilize
m_dict.
End Class
Private Sub Button1_Click_1(ByVal sender As System.Object, ByVal e
As System.EventArgs) Handles Button1.Click
Dim wrapper As New DictionaryWrapper(Of String, Integer)()
wrapper("key1") = 10
wrapper("key2") = 15
Me.Text = "Sum of values = " + (wrapper("key1") +
wrapper("key2")).ToString
End Sub
End Class
thank you very much
Hi Pamela,
In the following lines:
class DictionaryWrapper<Key, Value>
{
private Dictionary<Key, Valuem_dict = new Dictionary<Key, Value>();
That's where the wrapper passes the types that it accepts straight to the
internal Dictionary object (note <Key, Valuepairs). Key is a type, Value
is a type.
Then when you create the wrapper object, you specify the exact types that
you want it to handle:
DictionaryWrapper<string, intwrapper = new DictionaryWrapper<string,
int>();
Note <string, intpairs: string is the type for keys, int is the type for
values. Of course you can do with other types of your choice.
<string, string>, <int, string>, <int, long>, etc...
"pamela fluente" <pa***********@libero.itwrote in message
news:11**********************@v45g2000cwv.googlegr oups.com...
On 9 Feb, 20:53, "Ashot Geodakov" <a_geoda...@hotmail.comwrote:
>Hi Pamela,
here's a small sample based on what I could understand from your requirements:
using System; using System.Collections.Generic; using System.Windows.Forms;
namespace WindowsApplication1 { class DictionaryWrapper<Key, Value> { private Dictionary<Key, Valuem_dict = new Dictionary<Key, Value>();
Thanks Ashot .
My problem is I do not know how to pass the types that are declared
externally (as parameters for the wrapper constructor)
for the Key and the Value to the internal typed dictionary
System.Collections.Generic.Dictionary(Of MyObjectType1, MyObjectType2)
(MyComparer)
I do not see any type declaration in your code. I am not sure
whether you have provided
the answer to what I was looking for ...
Perhaps c# and vb are too different here or I do not get it ...
mmm I am having hard time with this one.
Anyone more suggestions ?
-Pam This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics
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