problem with IExtenderProvider

  • Thread starter Thread starter Martin
  • Start date Start date
M

Martin

I'm implemented a class called MyProvider which inherited from Component and
IExtenderProvider. i have the problem, that when I typed anything in the
visual studio designer in my MyItem-object which is provided by MyProvider,
the data is lost, after I clicked in another textbox. i added the following
methods in my provider:

[ProviderProperty("MyProvider", typeof(Control)]
public class MyProvider : Component, IExtenderProvider {

[ExtenderProvidedProperty]
[TypeConverter(typeof(MyItemConverter))]
public MyItem GetMyProvider(Control control) { }

[ExtenderProvidedProperty]
public void SetMyProvider(Control extendee, MyItem value) { }

public bool ShouldSerializeMyProvider(Control extendee) {}

}

my MyItem class has 4 properties. 2 of them are hidden for the designer
serialization.the last 2 properties are of type string.

any ideas why he deletes the entered data?
 
Martin said:
I'm implemented a class called MyProvider which inherited from Component
and IExtenderProvider. i have the problem, that when I typed anything in
the visual studio designer in my MyItem-object which is provided by
MyProvider, the data is lost, after I clicked in another textbox. i added
the following methods in my provider:

[ProviderProperty("MyProvider", typeof(Control)]
public class MyProvider : Component, IExtenderProvider {

[ExtenderProvidedProperty]
[TypeConverter(typeof(MyItemConverter))]
public MyItem GetMyProvider(Control control) { }

[ExtenderProvidedProperty]
public void SetMyProvider(Control extendee, MyItem value) { }

public bool ShouldSerializeMyProvider(Control extendee) {}

}

my MyItem class has 4 properties. 2 of them are hidden for the designer
serialization.the last 2 properties are of type string.

any ideas why he deletes the entered data?
Click to expand...

Because you are not saving it anywhere.
Let's see the actual method code.
 
Ok i found the bug... it was an oversight

in my Get method I created a new instance of my object and returned it. the
problem was that i didn't add the new instance to my internal collection.

but i have an onther problem too. when I'm trying to save the project with
my provider. I got an error "An error occurred while code generation for the
MyProvider-Property. the object rereference hasn't got a object instance."

maybe its a problem with my converter?

Nick Hounsome said:
Martin said:
I'm implemented a class called MyProvider which inherited from Component
and IExtenderProvider. i have the problem, that when I typed anything in
the visual studio designer in my MyItem-object which is provided by
MyProvider, the data is lost, after I clicked in another textbox. i added
the following methods in my provider:

[ProviderProperty("MyProvider", typeof(Control)]
public class MyProvider : Component, IExtenderProvider {

[ExtenderProvidedProperty]
[TypeConverter(typeof(MyItemConverter))]
public MyItem GetMyProvider(Control control) { }

[ExtenderProvidedProperty]
public void SetMyProvider(Control extendee, MyItem value) { }

public bool ShouldSerializeMyProvider(Control extendee) {}

}

my MyItem class has 4 properties. 2 of them are hidden for the designer
serialization.the last 2 properties are of type string.

any ideas why he deletes the entered data?
Click to expand...

Because you are not saving it anywhere.
Let's see the actual method code.
Click to expand...
 
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