C# Discussion Boards - CodeProject

.NET 4 changes to Type.GetProperties

8-Jan-11 0:22

You could easily find the error if you just used the tools that come with Visual Studio - namely, the debugger.

".45 ACP - because shooting twice is just silly" - JSOP, 2010
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You can never have too much ammo - unless you're swimming, or on fire. - JSOP, 2010
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"Why don't you tie a kerosene-soaked rag around your ankles so the ants won't climb up and eat your candy ass." - Dale Earnhardt, 1997

AndyGray7-Jan-11 6:07

AndyGray

7-Jan-11 6:07

Hi
I have discovered an issue using Type.GetProperties on a COM object when running under .NET 3.5 & .NET 4.0.

The following code uses the Microsoft Scripting Runtime COM object as an example - it has the same behaviour with any COM object I have tried. Under .NET 3.5, it correctly returns an array containing one property (the Drives property). Under .NET 4.0, it returns no properties.

Scripting.FileSystemObject fs = new Scripting.FileSystemObject();
Type t = fs.GetType();
PropertyInfo[] props = t.GetProperties();

Type.GetProperties seems to work correctly on .NET objects and only seems a problem with COM objects.

I have some generic code that sets property values by using a string variable as the name that works in .NET 3.5 and now fails in .NET 4.0.

I know that I can upgrade the code to use the dynamic type in .NET 4.0 to do this BUT why is this not backwards compatible or at least documented in some way that is easy to find?

Kind regards
Andy

Richard MacCutchan7-Jan-11 8:21

Richard MacCutchan

7-Jan-11 8:21

Sorry to state the obvious, but since Microsoft are the providers of this software, I believe they are best qualified to answer your question.

I must get a clever new signature for 2011.

AndyGray8-Jan-11 6:37

AndyGray

8-Jan-11 6:37

Sorry but that part of the posting with a question mark was really a rhetorical question and I could not report it to MS as the forums appeared to be down when I tried. I was hoping that someone may have experienced the same issue and had some constructive advice.

My comment that I could always use the new dynamic type seems wide of the mark and it doesn't help me at all. For the purposes of the project I'm working on, I need to be able to call a property by its name since I am mapping some data between two applications and the mapping details are stored in XML configuration files.

I need to use .NET 4.0 since I am developing an application to be certified for Dynamics CRM 5 and this looks like it will only allow .NET 4.0. The other application is a legacy application that only has a COM interface so I'm a little stuck at the moment.

Regards
Andy

#realJSOP8-Jan-11 0:26

8-Jan-11 0:26

This is the example they give on the MSDN site:

PropertyInfo[] myPropertyInfo;
// Get the properties of 'Type' class object.
myPropertyInfo = Type.GetType("System.Type").GetProperties();

Slightly different from yous, but I'd give it a try.

AndyGray8-Jan-11 6:39

AndyGray

8-Jan-11 6:39

Hi John,

I think you will find that

string x = "";<br />
x.GetType().GetProperties()

is exactly the same as

Type.GetType("System.String").GetProperties()

Thanks for taking the time to answer though
Regards
Andy

#realJSOP8-Jan-11 6:48

enums in a class display in Class View alongside classes

8-Jan-11 6:48

Yeah, I know, but stranger things have happened in .Net.

bob169727-Jan-11 4:53

bob16972

7-Jan-11 4:53

Is there a way to still sort the Class View by type (without grouping by type) and have the enums that are defined within a class only display within that class like members do?

clipboard pastes two times

Erdinc276-Jan-11 22:52

6-Jan-11 22:52

i want to copy a tex from texbox and paste it another one in my form
i copy it with that code

Clipboard.SetText(textBox1.SelectedText);

and paste it with that

private void Form1_KeyDown(object sender, KeyEventArgs e)
{
   if ((e.Modifiers == Keys.Control)&&(e.KeyCode == Keys.V))
      textBox2.Text = Clipboard.GetText();
}

but the problem is it pastes selceted text two times but when i try like that

(e.Modifiers == Keys.Control)

it pastes one time
what should i do now ?

vemedya.com

JF20156-Jan-11 22:58

JF2015

6-Jan-11 22:58

I've tested your code and it is working fine for me. I think that the problem must be somewhere else. What is the content of the Clipboard when pasting?

Erdinc276-Jan-11 23:18

6-Jan-11 23:18

its content is te selected text from the textbox..for example if i write 'w' in my textbox and paste it to my another box it appears 'ww'

vemedya.com

Erdinc276-Jan-11 23:23

6-Jan-11 23:23

hey friend thanks for reply..i solved my problem ..i set my form's KeyPreview false and it works now..

vemedya.com

JF20156-Jan-11 23:34

JF2015

6-Jan-11 23:34

Glad to help - at least your code is correct. All I could do is tell you that the problem must be somewhere else Big Grin | :-D

Luc Pattyn7-Jan-11 0:21

Luc Pattyn

7-Jan-11 0:21

CTRL/V is handled automatically by some Controls.
You make the Form react to it, but didn't tell the system that is all you want to happen, so if a suitable Control has focus, it will still oblige the CTRL/V.

Clearing KeyPreview is unlikely the solution; it was set for a reason. Look for KeyEventArgs.Handled and SuppressKeyPress.

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles] [My CP bug tracking] Nil Volentibus Arduum

Season's Greetings to all CPians.

#realJSOP7-Jan-11 1:45

7-Jan-11 1:45

I believe you want to handle an event for the control you're pasting into as opposed to handling it in the form.

Erdinc277-Jan-11 22:01