Reflection

[QQ]

I am trying to use reflection to access the private property of
OpenFileDialog fileNames property. I have the following code :

filedlg.Initial Directory = directory.Text;

filedlg.Filter = "xml files (*.xml)|*.xml" ;
filedlg.FileNam e = "*.xml";
filedlg.Validat eNames = false;

if (filedlg.ShowDi alog() == DialogResult.Ca ncel)
return;

Type t = filedlg.GetType ();

PropertyInfo rowsPropertyInf o = t.GetProperty(" fileNames",
BindingFlags.In stance |
BindingFlags.St atic |
BindingFlags.Ge tProperty |
BindingFlags.Pu blic |
BindingFlags.No nPublic|
BindingFlags.Su ppressChangeTyp e);
object[] o = (object[])rowsPropertyIn fo.GetValue(fil edlg,
BindingFlags.In stance |
BindingFlags.St atic |
BindingFlags.Ge tProperty |
BindingFlags.Pu blic |
BindingFlags.No nPublic|
BindingFlags.Su ppressChangeTyp e,
null, null, null);

I got an error :

An unhandled exception of type 'System.NullRef erenceException ' occurred in
BGReport.exe

Additional information: Object reference not set to an instance of an
object.

Any idea ? Thanks.

[Jon Skeet [C# MVP]]

QQ <an*******@disc ussions.microso ft.com> wrote:

I am trying to use reflection to access the private property of
OpenFileDialog fileNames property. I have the following code :

<snip>

Please see my response to the same question you asked half an hour ago,
and read http://www.pobox.com/~skeet/csharp/faq/posting.html

--
Jon Skeet - <sk***@pobox.co m>
http://www.pobox.com/~skeet
If replying to the group, please do not mail me too

[adnan boz]

Hi,
Wrong text case on property name.
Use "FileNames" , and not "fileNames" .

cu
Adnan
"QQ" <an*******@disc ussions.microso ft.com> wrote in message news:OD******** ******@TK2MSFTN GP11.phx.gbl...
I am trying to use reflection to access the private property of
OpenFileDialog fileNames property. I have the following code :

filedlg.Initial Directory = directory.Text;

filedlg.Filter = "xml files (*.xml)|*.xml" ;
filedlg.FileNam e = "*.xml";
filedlg.Validat eNames = false;

if (filedlg.ShowDi alog() == DialogResult.Ca ncel)
return;

Type t = filedlg.GetType ();

PropertyInfo rowsPropertyInf o = t.GetProperty(" fileNames",
BindingFlags.In stance |
BindingFlags.St atic |
BindingFlags.Ge tProperty |
BindingFlags.Pu blic |
BindingFlags.No nPublic|
BindingFlags.Su ppressChangeTyp e);
object[] o = (object[])rowsPropertyIn fo.GetValue(fil edlg,
BindingFlags.In stance |
BindingFlags.St atic |
BindingFlags.Ge tProperty |
BindingFlags.Pu blic |
BindingFlags.No nPublic|
BindingFlags.Su ppressChangeTyp e,
null, null, null);

I got an error :

An unhandled exception of type 'System.NullRef erenceException ' occurred in
BGReport.exe

Additional information: Object reference not set to an instance of an
object.

Any idea ? Thanks.

[adnan boz]

Hi,
Wrong text case on property name.
Use "FileNames" , and not "fileNames" .

cu
Adnan
"QQ" <an*******@disc ussions.microso ft.com> wrote in message news:OD******** ******@TK2MSFTN GP11.phx.gbl...
I am trying to use reflection to access the private property of
OpenFileDialog fileNames property. I have the following code :

filedlg.Initial Directory = directory.Text;

filedlg.Filter = "xml files (*.xml)|*.xml" ;
filedlg.FileNam e = "*.xml";
filedlg.Validat eNames = false;

if (filedlg.ShowDi alog() == DialogResult.Ca ncel)
return;

Type t = filedlg.GetType ();

PropertyInfo rowsPropertyInf o = t.GetProperty(" fileNames",
BindingFlags.In stance |
BindingFlags.St atic |
BindingFlags.Ge tProperty |
BindingFlags.Pu blic |
BindingFlags.No nPublic|
BindingFlags.Su ppressChangeTyp e);
object[] o = (object[])rowsPropertyIn fo.GetValue(fil edlg,
BindingFlags.In stance |
BindingFlags.St atic |
BindingFlags.Ge tProperty |
BindingFlags.Pu blic |
BindingFlags.No nPublic|
BindingFlags.Su ppressChangeTyp e,
null, null, null);

I got an error :

An unhandled exception of type 'System.NullRef erenceException ' occurred in
BGReport.exe

Additional information: Object reference not set to an instance of an
object.

Any idea ? Thanks.

hi,

"fileNames" is actually a private field not
property. if you are referring to property, it should
be "FileNames" . if you are trying to get the value of
private field, this sample by theory should work:

using System;
using System.Collecti ons;
using System.Windows. Forms;
using System.Reflecti on;

public class MyClass : System.Windows. Forms.Form
{
private Button btn;

public static void Main()
{
Application.Run (new MyClass());
}

public MyClass()
{
btn = new Button();
btn.Click += new EventHandler(On Click);
btn.Text = "Click";
this.Controls.A dd(btn);
}

private static void OnClick(object sender,
EventArgs e)
{
MyClass2 c2 = new MyClass2();
FieldInfo field = c2.GetType().Ge tField
("field1", BindingFlags.In stance |
BindingFlags.No nPublic );
if (field!=null)
MessageBox.Show (field.GetValue
(c2).ToString() );
else
MessageBox.Show ("null");
}
}

public class MyClass2
{
private string field1 = "gani";
}

but unfortunately, i can't get the "fileNames" private
field of OpenFileDialog.

HTH,

gani
http://thedeveloperscorner.com.ph

-----Original Message-----
QQ <an*******@disc ussions.microso ft.com> wrote:

I am trying to use reflection to access the private property of OpenFileDialog fileNames property. I have the

following code :
<snip>

Please see my response to the same question you asked half an hour ago,and read http://www.pobox.com/~skeet/csharp/faq/posting.html
--
Jon Skeet - <sk***@pobox.co m>
http://www.pobox.com/~skeet
If replying to the group, please do not mail me too
.

[QQ]

I tried it but failed.

<an*******@disc ussions.microso ft.com> wrote in message
news:18******** *************** ******@phx.gbl. ..

hi,

"fileNames" is actually a private field not
property. if you are referring to property, it should
be "FileNames" . if you are trying to get the value of
private field, this sample by theory should work:

using System;
using System.Collecti ons;
using System.Windows. Forms;
using System.Reflecti on;

public class MyClass : System.Windows. Forms.Form
{
private Button btn;

public static void Main()
{
Application.Run (new MyClass());
}

public MyClass()
{
btn = new Button();
btn.Click += new EventHandler(On Click);
btn.Text = "Click";
this.Controls.A dd(btn);
}

private static void OnClick(object sender,
EventArgs e)
{
MyClass2 c2 = new MyClass2();
FieldInfo field = c2.GetType().Ge tField
("field1", BindingFlags.In stance |
BindingFlags.No nPublic );
if (field!=null)
MessageBox.Show (field.GetValue
(c2).ToString() );
else
MessageBox.Show ("null");
}
}

public class MyClass2
{
private string field1 = "gani";
}

but unfortunately, i can't get the "fileNames" private
field of OpenFileDialog.

HTH,

gani
http://thedeveloperscorner.com.ph

-----Original Message-----
QQ <an*******@disc ussions.microso ft.com> wrote:

I am trying to use reflection to access the private property of OpenFileDialog fileNames property. I have the

following code :

<snip>

Please see my response to the same question you asked

half an hour ago,

and read

http://www.pobox.com/~skeet/csharp/faq/posting.html

--
Jon Skeet - <sk***@pobox.co m>
http://www.pobox.com/~skeet
If replying to the group, please do not mail me too
.

[QQ]

I m accessing the private property of OpenFileDialog. So it is the correct
field (fileNames).

"adnan boz" <ab*********@ho tmail.com> wrote in message
news:#c******** ******@TK2MSFTN GP09.phx.gbl...
Hi,
Wrong text case on property name.
Use "FileNames" , and not "fileNames" .

cu
Adnan
"QQ" <an*******@disc ussions.microso ft.com> wrote in message
news:OD******** ******@TK2MSFTN GP11.phx.gbl...
I am trying to use reflection to access the private property of
OpenFileDialog fileNames property. I have the following code :

filedlg.Initial Directory = directory.Text;

filedlg.Filter = "xml files (*.xml)|*.xml" ;
filedlg.FileNam e = "*.xml";
filedlg.Validat eNames = false;

if (filedlg.ShowDi alog() == DialogResult.Ca ncel)
return;

Type t = filedlg.GetType ();

PropertyInfo rowsPropertyInf o = t.GetProperty(" fileNames",
BindingFlags.In stance |
BindingFlags.St atic |
BindingFlags.Ge tProperty |
BindingFlags.Pu blic |
BindingFlags.No nPublic|
BindingFlags.Su ppressChangeTyp e);
object[] o = (object[])rowsPropertyIn fo.GetValue(fil edlg,
BindingFlags.In stance |
BindingFlags.St atic |
BindingFlags.Ge tProperty |
BindingFlags.Pu blic |
BindingFlags.No nPublic|
BindingFlags.Su ppressChangeTyp e,
null, null, null);

I got an error :

An unhandled exception of type 'System.NullRef erenceException ' occurred in
BGReport.exe

Additional information: Object reference not set to an instance of an
object.

Any idea ? Thanks.

[Jon Skeet [C# MVP]]

QQ <an*******@disc ussions.microso ft.com> wrote:

I m accessing the private property of OpenFileDialog. So it is the correct
field (fileNames).

Hang on - is it a field or a property? The two are very different.

--
Jon Skeet - <sk***@pobox.co m>
http://www.pobox.com/~skeet
If replying to the group, please do not mail me too

[adnan boz]

Hi,
Right, it is inaccessable.
So, you don't have the ReflectionPermi ssion. As described on
msdn(Type.GetPr operty Method (String, BindingFlags): If the requested type
is non-public and the caller does not have ReflectionPermi ssion to reflect
non-public objects outside the current assembly, this method returns a null
reference (Nothing in Visual Basic).)

But, why do you need the private fileNames?
So far I could examine, public FileNames returns the same thing,
except it uses FileIOPermissio n on every fileName clone.

Adnan
"QQ" <an*******@disc ussions.microso ft.com> wrote in message
news:uo******** ******@TK2MSFTN GP09.phx.gbl...
I m accessing the private property of OpenFileDialog. So it is the correct
field (fileNames).

"adnan boz" <ab*********@ho tmail.com> wrote in message
news:#c******** ******@TK2MSFTN GP09.phx.gbl...
Hi,
Wrong text case on property name.
Use "FileNames" , and not "fileNames" .

cu
Adnan
"QQ" <an*******@disc ussions.microso ft.com> wrote in message
news:OD******** ******@TK2MSFTN GP11.phx.gbl...
I am trying to use reflection to access the private property of
OpenFileDialog fileNames property. I have the following code :

filedlg.Initial Directory = directory.Text;

filedlg.Filter = "xml files (*.xml)|*.xml" ;
filedlg.FileNam e = "*.xml";
filedlg.Validat eNames = false;

if (filedlg.ShowDi alog() == DialogResult.Ca ncel)
return;

Type t = filedlg.GetType ();

PropertyInfo rowsPropertyInf o = t.GetProperty(" fileNames",
BindingFlags.In stance |
BindingFlags.St atic |
BindingFlags.Ge tProperty |
BindingFlags.Pu blic |
BindingFlags.No nPublic|
BindingFlags.Su ppressChangeTyp e);
object[] o = (object[])rowsPropertyIn fo.GetValue(fil edlg,
BindingFlags.In stance |
BindingFlags.St atic |
BindingFlags.Ge tProperty |
BindingFlags.Pu blic |
BindingFlags.No nPublic|
BindingFlags.Su ppressChangeTyp e,
null, null, null);

I got an error :

An unhandled exception of type 'System.NullRef erenceException ' occurred in
BGReport.exe

Additional information: Object reference not set to an instance of an
object.

Any idea ? Thanks.

[Tank]

Reason is :

I have the following code :

OpenFileDialog filedlg = new OpenFileDialog( );

filedlg.Initial Directory = directory.Text;

filedlg.Filter = "lvl files (*.lvl)|*.lvl" ;
filedlg.FileNam e = "*.lvl";
filedlg.Validat eNames = false;

if (filedlg.ShowDi alog() == DialogResult.Ca ncel)
return;

string dirname = Path.GetDirecto ryName(filedlg. FileName);

I set the property ValidateNames to false. I didn't select any file when
the dialog box pop-ups. When I click the "Open" button, the dialog box was
closed. The problem is filedlg.FileNam e doesn't not contain anything. I
expect it to have something like this c:\Test\*.lvl (with Win32
OpenFileDialog, it will). The protected member of OpenFileDialog namely
fileNames and FileNameInterna l do have the value but as it is a protected
member, the value is inaccessible. ). With GetOpenFileName , i will be able
to get the result (C:\test\*.lvl) .
"adnan boz" <ab*********@ho tmail.com> wrote in message
news:uV******** ******@tk2msftn gp13.phx.gbl...

Hi,
Right, it is inaccessable.
So, you don't have the ReflectionPermi ssion. As described on
msdn(Type.GetPr operty Method (String, BindingFlags): If the requested type
is non-public and the caller does not have ReflectionPermi ssion to reflect
non-public objects outside the current assembly, this method returns a null reference (Nothing in Visual Basic).)

But, why do you need the private fileNames?
So far I could examine, public FileNames returns the same thing,
except it uses FileIOPermissio n on every fileName clone.

Adnan
"QQ" <an*******@disc ussions.microso ft.com> wrote in message
news:uo******** ******@TK2MSFTN GP09.phx.gbl...
I m accessing the private property of OpenFileDialog. So it is the correct
field (fileNames).

"adnan boz" <ab*********@ho tmail.com> wrote in message
news:#c******** ******@TK2MSFTN GP09.phx.gbl...
Hi,
Wrong text case on property name.
Use "FileNames" , and not "fileNames" .

cu
Adnan
"QQ" <an*******@disc ussions.microso ft.com> wrote in message
news:OD******** ******@TK2MSFTN GP11.phx.gbl...
I am trying to use reflection to access the private property of
OpenFileDialog fileNames property. I have the following code :

filedlg.Initial Directory = directory.Text;

filedlg.Filter = "xml files (*.xml)|*.xml" ;
filedlg.FileNam e = "*.xml";
filedlg.Validat eNames = false;

if (filedlg.ShowDi alog() == DialogResult.Ca ncel)
return;

Type t = filedlg.GetType ();

PropertyInfo rowsPropertyInf o = t.GetProperty(" fileNames",
BindingFlags.In stance |
BindingFlags.St atic |
BindingFlags.Ge tProperty |
BindingFlags.Pu blic |
BindingFlags.No nPublic|
BindingFlags.Su ppressChangeTyp e);
object[] o = (object[])rowsPropertyIn fo.GetValue(fil edlg,
BindingFlags.In stance |
BindingFlags.St atic |
BindingFlags.Ge tProperty |
BindingFlags.Pu blic |
BindingFlags.No nPublic|
BindingFlags.Su ppressChangeTyp e,
null, null, null);

I got an error :

An unhandled exception of type 'System.NullRef erenceException ' occurred in BGReport.exe

Additional information: Object reference not set to an instance of an
object.

Any idea ? Thanks.