if I have a property something like :
[DefaultValue(0)]
public int Width
{
get {return m_width}
set {m_width = value}
}
As a calling program/routine how can I set m_width back to it's default value 0 without knowing that it is 0
i.e. something like this.Width = Width.DefaultVa lue rather than this.Width = 0
Thanks,
Steve
7  7397 
The DefaultValue attribute is there for the benefit of the PropertyGrid as
used in design time mode. The grid reads the attribute using reflection to
obtain the default value and provides the user with an option to "reset" the
value.
You could use a similar scheme to read the attributes of any given property
and see if it had a default value attribute. Then, if it does, force the
property to the value.
--
Bob Powell [MVP]
Visual C#, System.Drawing
Ramuseco Limited .NET consulting http://www.ramuseco.com
Find great Windows Forms articles in Windows Forms Tips and Tricks http://www.bobpowell.net/tipstricks.htm
Answer those GDI+ questions with the GDI+ FAQ http://www.bobpowell.net/faqmain.htm
All new articles provide code in C# and VB.NET.
Subscribe to the RSS feeds provided and never miss a new article.
"steve bull" <bu****@comcast .net> wrote in message
news:w3******** *************** ***@4ax.com...
if I have a property something like :
[DefaultValue(0)]
public int Width
{
get {return m_width}
set {m_width = value}
}
As a calling program/routine how can I set m_width back to it's default
value 0 without knowing that it is 0
i.e. something like this.Width = Width.DefaultVa lue rather than this.Width
= 0
Thanks,
Steve
DefaultValue does not set the value of your property.
It is used for the property-sheet. So you can click the Reset button Then
the default values are set.
Try to set the DefaultValue other than 0. And you'll see.
"steve bull" wrote:
if I have a property something like :
[DefaultValue(0)]
public int Width
{
get {return m_width}
set {m_width = value}
}
As a calling program/routine how can I set m_width back to it's default value 0 without knowing that it is 0
i.e. something like this.Width = Width.DefaultVa lue rather than this.Width = 0
Thanks,
Steve
I got the following code from MSDN:
// Gets the attributes for the property.
AttributeCollec tion attributes = TypeDescriptor. GetProperties
(this)"MyProper ty"].Attributes;
/* Prints the default value by retrieving the DefaultValueAtt ribute
* from the AttributeCollec tion. */
DefaultValueAtt ribute myAttribute =
(DefaultValueAt tribute)attribu tes[typeof(DefaultV alueAttribute)];
Console.WriteLi ne("The default value is: " + myAttribute.Val ue.ToString());
You can use the myAttribute.Val ue to set the your property to the default
value.
"steve bull" wrote:
if I have a property something like :
[DefaultValue(0)]
public int Width
{
get {return m_width}
set {m_width = value}
}
As a calling program/routine how can I set m_width back to it's default value 0 without knowing that it is 0
i.e. something like this.Width = Width.DefaultVa lue rather than this.Width = 0
Thanks,
Steve
The DefaultValue attribute is there for the benefit of the PropertyGrid as
used in design time mode. The grid reads the attribute using reflection to
obtain the default value and provides the user with an option to "reset" the
value.
You could use a similar scheme to read the attributes of any given property
and see if it had a default value attribute. Then, if it does, force the
property to the value.
--
Bob Powell [MVP]
Visual C#, System.Drawing
Ramuseco Limited .NET consulting http://www.ramuseco.com
Find great Windows Forms articles in Windows Forms Tips and Tricks http://www.bobpowell.net/tipstricks.htm
Answer those GDI+ questions with the GDI+ FAQ http://www.bobpowell.net/faqmain.htm
All new articles provide code in C# and VB.NET.
Subscribe to the RSS feeds provided and never miss a new article.
"steve bull" <bu****@comcast .net> wrote in message
news:w3******** *************** ***@4ax.com...
if I have a property something like :
[DefaultValue(0)]
public int Width
{
get {return m_width}
set {m_width = value}
}
As a calling program/routine how can I set m_width back to it's default
value 0 without knowing that it is 0
i.e. something like this.Width = Width.DefaultVa lue rather than this.Width
= 0
Thanks,
Steve
DefaultValue does not set the value of your property.
It is used for the property-sheet. So you can click the Reset button Then
the default values are set.
Try to set the DefaultValue other than 0. And you'll see.
"steve bull" wrote:
if I have a property something like :
[DefaultValue(0)]
public int Width
{
get {return m_width}
set {m_width = value}
}
As a calling program/routine how can I set m_width back to it's default value 0 without knowing that it is 0
i.e. something like this.Width = Width.DefaultVa lue rather than this.Width = 0
Thanks,
Steve
I got the following code from MSDN:
// Gets the attributes for the property.
AttributeCollec tion attributes = TypeDescriptor. GetProperties
(this)"MyProper ty"].Attributes;
/* Prints the default value by retrieving the DefaultValueAtt ribute
* from the AttributeCollec tion. */
DefaultValueAtt ribute myAttribute =
(DefaultValueAt tribute)attribu tes[typeof(DefaultV alueAttribute)];
Console.WriteLi ne("The default value is: " + myAttribute.Val ue.ToString());
You can use the myAttribute.Val ue to set the your property to the default
value.
"steve bull" wrote:
if I have a property something like :
[DefaultValue(0)]
public int Width
{
get {return m_width}
set {m_width = value}
}
As a calling program/routine how can I set m_width back to it's default value 0 without knowing that it is 0
i.e. something like this.Width = Width.DefaultVa lue rather than this.Width = 0
Thanks,
Steve
thanks, I will give it a try
Steve
On Wed, 29 Jun 2005 23:37:02 -0700, Marinus Holkema <Ma************ @discussions.mi crosoft.com> wrote: I got the following code from MSDN:
// Gets the attributes for the property.
AttributeCollec tion attributes = TypeDescriptor. GetProperties
(this)"MyProper ty"].Attributes;
/* Prints the default value by retrieving the DefaultValueAtt ribute
* from the AttributeCollec tion. */
DefaultValueAtt ribute myAttribute =
(DefaultValueAt tribute)attribu tes[typeof(DefaultV alueAttribute)];
Console.WriteLi ne("The default value is: " + myAttribute.Val ue.ToString());
You can use the myAttribute.Val ue to set the your property to the default
value.
"steve bull" wrote:
if I have a property something like :
[DefaultValue(0)]
public int Width
{
get {return m_width}
set {m_width = value}
}
As a calling program/routine how can I set m_width back to it's default value 0 without knowing that it is 0
i.e. something like this.Width = Width.DefaultVa lue rather than this.Width = 0
Thanks,
Steve
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