Databinding with Nested Objects

[Victor Jones]

Hi

I was wondering if there was any approach to bind an object that contains a
nested object within. Suppose class A is defined as

class A
{

 

[Thomas Tomiczek \(MVP\)]

You really love asking the same question separatly in two newsgroups

Bear with me when I say I dont like ansering them in two newsgroups. I
answered to your post in the databinding newsgroup.

Thomas Tomiczek
THONA Software & Consulting Ltd.
(Microsoft MVP C#/:NET)

 

[Victor Jones]

Thanks for the suggestion. Doesn't hurt to get different opinions on
different newsgroups

You really love asking the same question separatly in two newsgroups

Bear with me when I say I dont like ansering them in two newsgroups. I
answered to your post in the databinding newsgroup.

Thomas Tomiczek
THONA Software & Consulting Ltd.
(Microsoft MVP C#/:NET)

Hi

I was wondering if there was any approach to bind an object that

contains

a
nested object within. Suppose class A is defined as

class A
{
.
.
.
//Property that exposes nested object
public B prop
{
get{return new B();}
}
}

and class B is defined as

class B
{
//Properties corresponding to B
public int x
{
get{return 1;}
}
.
.
.

}

If I were to bind a strongly typed collection of object A and try to bind
the collection, the property that exposes the nested object, does not show
the values. What would I require to do if I want to bind collection of A
where the properties of B are included as a "joined view" . I tried
implementing TypeConvertor and override GetProperties, but Iam unable to add
to the propertydescriptorcollection since it is not implemented.

I was wondering if there was any other approach to this whole problem. This
seems like a common scenario.

public class NestedPropertyConverter : TypeConverter
{
public override PropertyDescriptorCollection
GetProperties(ITypeDescriptorContext context,object value, Attribute[]
filter)
{
//Obtain the default property descriptors, add nested properties and return
PropertyDescriptorCollection props = TypeDescriptor.GetProperties(value,
filter);

for(int i=0; i<props.Count; ++i)
{
PropertyDescriptor desc = props;
if(desc.PropertyType == Type.GetType("B"))
{

PropertyDescriptorCollection nestedProps =
TypeDescriptor.GetProperties(desc.PropertyType);

for(int j=0; j<nestedProps.Count; ++j)
{
PropertyDescriptor nestedDesc = nestedProps[j];
//Add to the top most PropertyDescriptor Collection
//CANNOT ADD SINCE NOT IMPLEMENTED
props.Add(nestedDesc);


}

}
return props;
}
}

Thanks in advance
Viktor

 

[Thomas Tomiczek \(MVP\)]

Does not get hurt, no.

But it shows you dont care for the work other do and you are not a friendly
person.

Why did you not CROSSPOST as netiquette asks for?

Frankly, dont you know how to use a newsreader?

You multiposted, and this is frowned upon.

Thomas Tomiczek

Thanks for the suggestion. Doesn't hurt to get different opinions on
different newsgroups

You really love asking the same question separatly in two newsgroups

Bear with me when I say I dont like ansering them in two newsgroups. I
answered to your post in the databinding newsgroup.

Thomas Tomiczek
THONA Software & Consulting Ltd.
(Microsoft MVP C#/:NET)

Hi

I was wondering if there was any approach to bind an object that

contains

a
nested object within. Suppose class A is defined as

class A
{
.
.
.
//Property that exposes nested object
public B prop
{
get{return new B();}
}
}

and class B is defined as

class B
{
//Properties corresponding to B
public int x
{
get{return 1;}
}
.
.
.

}

If I were to bind a strongly typed collection of object A and try to bind
the collection, the property that exposes the nested object, does not show
the values. What would I require to do if I want to bind collection of A
where the properties of B are included as a "joined view" . I tried
implementing TypeConvertor and override GetProperties, but Iam unable

to
add

to the propertydescriptorcollection since it is not implemented.

I was wondering if there was any other approach to this whole problem. This
seems like a common scenario.

public class NestedPropertyConverter : TypeConverter
{
public override PropertyDescriptorCollection
GetProperties(ITypeDescriptorContext context,object value, Attribute[]
filter)
{
//Obtain the default property descriptors, add nested properties and return
PropertyDescriptorCollection props = TypeDescriptor.GetProperties(value,
filter);

for(int i=0; i<props.Count; ++i)
{
PropertyDescriptor desc = props;
if(desc.PropertyType == Type.GetType("B"))
{

PropertyDescriptorCollection nestedProps =
TypeDescriptor.GetProperties(desc.PropertyType);

for(int j=0; j<nestedProps.Count; ++j)
{
PropertyDescriptor nestedDesc = nestedProps[j];
//Add to the top most PropertyDescriptor Collection
//CANNOT ADD SINCE NOT IMPLEMENTED
props.Add(nestedDesc);


}

}
return props;
}
}

Thanks in advance
Viktor