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Well, private would be pointless because the only thing that can access private members is the thing that declared it. Since an interface has no functionality what would you declare to be private that could be accessed?
You could use a similar argument for protected. The only thing that would be able to use a protected member would be things derived from the interface only. In that case, what would be the advantage?
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For protected method signatures the advantage would be to not to expose the method to outside.
Check out this link[^] that discusess something similar.
company, work and everything else @ netis
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Zoltan Balazs wrote: Check out this link[^] that discusess something similar.
They are not really private. The are publicly accessible when the object is cast to the appropriate interface. It is a mechanism to allow the disambiguation that may be needed if you inherit two different interfaces that happen to define the same member signature.
Zoltan Balazs wrote: For protected method signatures the advantage would be to not to expose the method to outside
But why would you need this on an interface? I can see this being useful on an abstract class (defining an abstract protected method) because the abstract class can contain some functionality and may wish to call the protected abstract method. The method details will be implemented in the derived class. But an interface contains no functionality, only member signatures. So it can have no advantages.
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Colin Angus Mackay wrote: he method details will be implemented in the derived class. But an interface contains no functionality, only member signatures. So it can have no advantages.
As I see it:
- I would have an interface that defines signatures of required protected methods
- these protected methods will be implemented in all similar classes
- the functionality will be similar to abstract class with the advantage that the designer could work!
That is what pisses me... that when deriving from an abstract class that suits my needs I can't use the designer later on (because it derives from a class that can't be instanciated)!
company, work and everything else @ netis
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Because the purpose of an interface is to specify members that a publically available to any code that uses a class that implements the interface.
There is no reason to force a class to implement anything for an interface that can't be used from the interface anyway.
---
single minded; short sighted; long gone;
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That was much better worded than my explanation - and more succinct too.
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Absolutely and it was a stupid question from me 
Actually what I had in mind was to use abstract class to require implementation of some methods
in a a derived form, but the the designer complains about how an abstract form can't be instantiated.
As a result the derived (non-abstract) form does not show up in the designer.
And that's why I thought of interfaces.
company, work and everything else @ netis
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Hi all,
Greetings.I need to detect the pop up bloker using javascript. if Pop is turned on i've to display a message "POPUP ON", if it is off have to display "POPUP OFF". I've tried out with some coding from net. But it is not working. Can any one of you help me to solve this issue as soon as possible. Its urgent.
Thanks in advance.
Babu
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This is a C# forum, not JavaScript forum.
Try searching it in google...
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hi! i want to create the following textboxes..
please help me..
1.one textbox contains numeric values only.
2.one contains characters only.
3.one contains EmailId.
4.one contains phone no
5.one contains pincode.
6.one contains fax no.
7. one contains mobile no.
8. one contains fax no.
how to validate this?
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use pattern matching for this.if you want to validate your input at the time of keypress then you have to do a little extra work on textBox_KeyPress event
else apply your validation at the time when you control looses its focus
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Check if this helps u,
Following code snippet is an example for validation of textbox. similar way compare values with different ascii numbers i.e. for only characters, numeric values...etc..
//VALIDATION FOR TELEPHONE NUMBER
bool valid5 = false;
char[] name5=new char[20];
name5=textBox27.Text.ToCharArray();
int leng5=textBox27.Text.Length ;
for(int i=0 ; i < leng5 ; i++ )
{
if( ((Convert.ToInt32(name5[i])>='0')&&(Convert.ToInt32(name5[i])<='9'))||(Convert.ToInt32(name21[i])==32))
{
valid5=true;
}
else
{
MessageBox.Show("TELEPHONE NUMBER: Enter the valid Telephone Number");
textBox27.Focus();
return;
}
}
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Use a Validator with regular expression. there are lots of examples on the web.
Grady Booch: I told Google to their face...what you need is some serious adult supervision. (2007 Turing lecture)
http:\\www.frankkerrigan.com
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I would like to check if user has entered ALT+10 or à , ä (UMALUT) or any english alphabets
The code sample in previous thread by 'sharmit' did not work for me.
Can you please point me the websites where I can find code sample for the same.
Sandeep Naik
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I want to basically check if user has entered any control characters
like 1-32 or 127 ASCII value (Ex: ALT + 127) in the edit box. And discard the same.
FYI this edit box should allow any other non english characters like French, German, Chinese, Japanese etc
Sandeep Naik
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Hello
I am trying to DoubleClick a row in a datagridview and open new form
and have textboxes populated from selectedrow.
This opens new form, not sure if its catching data
private void dataGridView1_CellContentDoubleClick(object sender, DataGridViewCellEventArgs e)
{
MasterForm.ActivateTab(2);
string strTemp = "";
strTemp = dataGridView1[dataGridView1.CurrentCell.RowIndex, 0].Value.ToString();
}
How do I bind it on next page/form to populate textboxes for selected columns?
Many thanks in advance
-- modified at 2:00 Friday 2nd March, 2007
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Hi,
A solution is to store the full row in the session object :
Session["selectrow"] = myDataSource.myTable.Rows[dataGridView1.CurrentCell.RowIndex];
Then in the load of the second page your read values from the session object :
mytextBox.Text = ((DataRow) Session["selectedrow"])["mycolumn"].ToString();
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Thanks works nice.
What if I want to go from Datagridview to Datagridview?
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Hi,
What do you mean by "from Datagridview to Datagridview" ?? It's not very clear for me.
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how to delete a commandbarbutton in ms-word that is already created..
and also how to check whether the button is already created..
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Hi guys,
I went through and played with the Example given in .net 2.0 It is working
perfectly fine in 32 bit Os that is XP... and i am getting the error
AccessViolation in Vista...Please help me how to solve it....My Vista is aslo
32 bit..
Unhandled Exception : System.AccessViolationException: Attempted to read or
write protected memory. This is often an indication that other memory is
corrupt.
at NetSDKSamples.LibWrap.DsBrowseForContainerW(DSBrowseInfo & info)
at NetSDKSamples.App.Main()
I have also tried running the exe as an Administrator..still the same result.
I have also tried runnint it from CMD promprt where cmd is also run as
administrator...still same result..
I am running out of ideas now... please help...me..
Path of Sample on My machine...
C:\Program Files\Microsoft Visual Studio
8\SDK\v2.0\LateBreaking\PlatformInvoke\WinAPIs\ActiveDir
Code:
//-----------------------------------------------------------------------
// This file is part of the Microsoft .NET Framework SDK Code Samples.
//
// Copyright (C) Microsoft Corporation. All rights reserved.
//
//This source code is intended only as a supplement to Microsoft
//Development Tools and/or on-line documentation. See these other
//materials for detailed information regarding Microsoft code samples.
//
//THIS CODE AND INFORMATION ARE PROVIDED AS IS WITHOUT WARRANTY OF ANY
//KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
//IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A
//PARTICULAR PURPOSE.
//-----------------------------------------------------------------------
// ActiveDir.cs
using System;
using System.Text;
using System.Runtime.InteropServices;
using System.Threading;
/*
typedef struct
{
DWORD cbStruct;
HWND hwndOwner;
LPCWSTR pszCaption;
LPCWSTR pszTitle;
LPCWSTR pszRoot;
LPWStr pszPath;
ULONG cchPath;
DWORD dwFlags;
BFFCALLBACK pfnCallback;
LPARAM lParam;
DWORD dwReturnFormat;
LPCWSTR pUserName;
LPCWSTR pPassword;
LPWStr pszObjectClass;
ULONG cchObjectClass;
} DSBROWSEINFOW, *PDSBROWSEINFOW;
*/
// all strings in structure will be marshaled as LPWStr
[ StructLayout( LayoutKind.Sequential, CharSet=CharSet.Unicode )]
public struct DSBrowseInfo
{
public int structSize;
private IntPtr dlgOwner;
public string dlgCaption;
public string treeViewTitle;
public string rootPath;
// in/out string must be declared as String in struct/class,
// not as StringBuilder
public string path;
public int pathSize;
public int flags;
private IntPtr callback;
private IntPtr lParam;
public int returnFormat;
public string userName;
public string password;
public string objectClass;
public int objectClassSize;
};
public class LibWrap
{
//int DsBrowseForContainer(PDSBROWSEINFO pInfo);
[ DllImport( "dsuiext.dll", CharSet=CharSet.Unicode )]
public static extern int DsBrowseForContainerW( ref DSBrowseInfo info );
public const int DSBI_ENTIREDIRECTORY = 0x00090000;
}
class App
{
public const int MAX_PATH = 256;
// Must be marked as STA since default is MTA. DsBrowseForContainerW calls
// CoInitialize, which initializes the COM library as STA.
[ STAThread ]
public static void Main()
{
// initialize all members
DSBrowseInfo dsbi = new DSBrowseInfo();
dsbi.structSize = Marshal.SizeOf( dsbi );
dsbi.dlgCaption = "The container picker";
dsbi.treeViewTitle = "Pick a container for this example.";
dsbi.path = new string( new char[ MAX_PATH ]);
dsbi.pathSize = dsbi.path.Length;
dsbi.flags = LibWrap.DSBI_ENTIREDIRECTORY;
dsbi.objectClass = new string( new char[ MAX_PATH ]);
dsbi.objectClassSize = dsbi.objectClass.Length;
Console.WriteLine( "Call DSBrowseForContainer..." );
int status = LibWrap.DsBrowseForContainerW( ref dsbi );
Console.WriteLine( "The status is " + status );
if( status == 1 )
{
Console.WriteLine( "The path is " + dsbi.path );
}
else
{
Console.WriteLine( "Call failed!" );
}
}
}
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Hi,
Is there any one who has encountered this issue. Basically my goal is to open the Active Diectory Container Browser using c#. I tried the above example in Vista. it does open it but when i try to close it i am getting the AccessViolation Exception. Please help me. As far as i know there is problem in above structure.
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i am biggner in c#.
i want to how to get multiple value from listbox or dropdownlistbox.
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Take a look at the SelectedItems property.
"Programming today is a race between software engineers striving to build bigger and better idiot-proof programs, and the Universe trying to produce bigger and better idiots. So far, the Universe is winning." - Rick Cook www.troschuetz.de
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sir,
i try with selecteditem property,but i dont get success.
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