Interitance and PropertyInfo Question

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lucius - 23 Feb 2007 22:15 GMT

.NET 2.0.

In the below code, when GrandChildThing is instanced, the
GrandChildProperty is never set in line 9 of ChildThing. Visual Studio
2005 IntelliSense says that the instance is GrandChildThing, but there
are no properties in the propInfos count and the property is never
set. Why?

public class BaseThing
{
public string ThingOutput;
}

public class ChldThing : BaseThing
{
internal void DoSomething()
{
string yes="yes";
PropertyInfo[] propInfos = this.GetType().GetProperties(); // count is
zero
foreach (PropertyInfo propertyInfo in this.GetType().GetProperties())
{
    if ( propertyInfo.Name == "GrandChildProperty")
    {
        XmlDocument grandchildXml = new XmlDocument();
        propertyInfo.SetValue( this , grandchildXml , null );
    }
}
}
}

public class GrandChildThing : ChildThing
{
public XmlDocument GrandChildProperty;

public Work()
{
base.DoSomething();
}
}

Reply to this Message

Ashot Geodakov - 23 Feb 2007 22:35 GMT

That's because GrandChildProperty in your GrandChildThing is not a property
but a member variable.

Redefine your class like this:

class GrandChildThing : ChildThing
{
private XmlDocument prop;

public XmlDocument GrandChildProperty // Now it's a property.
{
get
{
return prop;
}
set
{
prop = value;
}
}

public void Work()
{
base.DoSomething();
}
}

> .NET 2.0.
>
[quoted text clipped - 36 lines]
> }
> }

Reply to this Message

lucius - 24 Feb 2007 23:46 GMT

Then I guess I need to look for member variables and not properties.
Classes must serialize to Java, and member variables do that cleanly
but properties don't. So how can I query a class for member vars with
Reflection?

Thanks.

>That's because GrandChildProperty in your GrandChildThing is not a property
>but a member variable.
>
>Redefine your class like th

Reply to this Message

Ashot Geodakov - 25 Feb 2007 07:10 GMT

Not sure about Reflection, but System.Type can query for members.

Look in MSDN for System.Type.InvokeMember doc, it's got samples.

> Then I guess I need to look for member variables and not properties.
> Classes must serialize to Java, and member variables do that cleanly
[quoted text clipped - 8 lines]
>>
>>Redefine your class like th

Reply to this Message

Walter Wang [MSFT] - 26 Feb 2007 02:45 GMT

Hi lucius,

To get the member variables, you need to use Type.GetFields() instead of
Type.GetProperties().

By default Type.GetFields() will return all public fields (including static
public fields). To return private fields and non-static, use another
overload of the Type.GetFields by passing BindingFlags enumeration values:

FieldInfo[] fldInfos = this.GetType().GetFields(BindingFlags.NonPublic |
BindingFlags.Instance);

Hope this helps.

Sincerely,
Walter Wang (wawang@online.microsoft.com, remove 'online.')
Microsoft Online Community Support

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Reply to this Message

Walter Wang [MSFT] - 01 Mar 2007 02:21 GMT

Hi lucius,

I am interested in this issue. Would you mind letting me know the result of
the suggestions? If you need further assistance, feel free to let me know.
I will be more than happy to be of assistance.

Have a great day!

Regards,
Walter Wang (wawang@online.microsoft.com, remove 'online.')
Microsoft Online Community Support

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Reply to this Message

lucius - 02 Mar 2007 18:10 GMT

Please consider the matter closed, and thanks to you and the MVPs for
help. I was trying to stay with members to make things eaiser to
serialize with Java SOAP interop, but I have now moved to just using
Properties instead.

Thanks again.

>Hi lucius,
>
[quoted text clipped - 14 lines]
>
>This posting is provided "AS IS" with no warranties, and confers no rights.

Reply to this Message

Interitance and PropertyInfo Question

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