Property reflection

[Guest]

Hello!

I was wondering if there is a some way to mark a class property,
without modifiers use. By using reflection, I know how to get all properties
that returns int, but how to get only specific int properties?

See example below:

public class Test
{
private int _A;
private int _B;

public int A
{
get { return (_A); }
set { _A = value; }
}

(for example, I want to mark this property)
public int B
{
get { return (_B); }
set { _B = value; }
}
}

Object o = new Test();
PropertInfo[] properties = o.GetType().GetProperties();

I want to show only marked int properties? All these properties must be
accessible, so the way with modifiers public/protected is not useful.
I've done this with string array, so I have a condition inside loop that
checks if array contains a property. But I don't like doing it this way,
because I have a lot of classes and I think this is not the clearest way.

I will appreciate any suggestion.

Regards
Saso

 

[Guest]

It sounds like you need attributes. This link describes them.
http://msdn2.microsoft.com/en-us/library/z0w1kczw(VS.80).aspx

Another possibility is to write a function in each class that returns an
array PropertyInfo. This will allow each class to do the filtering. I think
the attributes thing will be cleaner though.

 

[Guest]

Some sample code that creates a checkbox for each property and checks the
ones we've flaged using a custom attribute.:

// AutomatedPropety attribute will identify the
// properties we want to look for.
[AttributeUsage(AttributeTargets.Property)]
class AutomatedPropertyAttribute
: Attribute
{ }

// Create a checkbox for each property and check the ones that
// have AutomatedPropertyAttribute.
private void Form1_Load(object sender, EventArgs e)
{
int top = 0;
foreach (PropertyInfo property in typeof(ClassA).GetProperties())
{
CheckBox checkbox = new CheckBox();
checkbox.Top = top;
top = checkbox.Bottom;
checkbox.Text = property.Name;
checkbox.Checked = (property.GetCustomAttributes(
typeof(AutomatedPropertyAttribute), true).Length > 0);
checkbox.Parent = this;
}
}

// This class has some properties that have been flagged
// with AtutomatedPropertyAttribute.
class ClassA
{
[AutomatedProperty]
public int PropertyA
{
get{return mPropertyA;}
set{mPropertyA = value;}
}

public int PropertyB
{
get { return mPropertyA; }
set { mPropertyA = value; }
}

public int PropertyC
{
get { return mPropertyA; }
set { mPropertyA = value; }
}

[AutomatedProperty]
public int PropertyD
{
get { return mPropertyA; }
set { mPropertyA = value; }
}

private int mPropertyA;
}

It sounds like you need attributes. This link describes them.
http://msdn2.microsoft.com/en-us/library/z0w1kczw(VS.80).aspx

Another possibility is to write a function in each class that returns an
array PropertyInfo. This will allow each class to do the filtering. I think
the attributes thing will be cleaner though.

Hello!

I was wondering if there is a some way to mark a class property,
without modifiers use. By using reflection, I know how to get all properties
that returns int, but how to get only specific int properties?

See example below:

public class Test
{
private int _A;
private int _B;

public int A
{
get { return (_A); }
set { _A = value; }
}

(for example, I want to mark this property)
public int B
{
get { return (_B); }
set { _B = value; }
}
}

Object o = new Test();
PropertInfo[] properties = o.GetType().GetProperties();

I want to show only marked int properties? All these properties must be
accessible, so the way with modifiers public/protected is not useful.
I've done this with string array, so I have a condition inside loop that
checks if array contains a property. But I don't like doing it this way,
because I have a lot of classes and I think this is not the clearest way.

I will appreciate any suggestion.

Regards
Saso