Question

I would like to know, if it is possible, to use simple C# CLR Objects as a Command Parameter in XAML, like I do it with MarkupExtensions.

For example, I use my own Markup Extension, which looks like this:

public class FormOpenExtension : MarkupExtension
    {
        public eForm e { get; set; }

        public override object ProvideValue(IServiceProvider serviceProvider)
        {
            return this;
        }
    }

The use of the MarkupExtension in XAML looks like this:

CommandParameter="{gui:FormOpen e=Login}

In XAML, I have full intellisense support for the FormOpenExtension Object , compiling is no problem. So this works like a charm.

—————————————

Now I have a simple CLR Object, that for example looks like this:

namespace DB
{
    [DataContract(IsReference = true)]
    public partial class User
    {
        #region Primitive Properties

        [Key][DataMember]
        public virtual int ID
        {
            get;
            set;
        }

        [DataMember]
        public virtual string Name
        {
            get;
            set;
        }
}
}

I can import the namespace into XAML and use the object, including intellisense like this:

CommandParameter="{db:User ID=1, Name=Foo}

Visual Studio says, I am using the User object like a MarkupExtension, but it is none.

I fully understand the problem. The plain User Object is no Extension.

What I don’t get, is how to use the User Object as a Command Parameter, without writing my own Extension.

So here are my 2 concrete questions:

1.) Is it possible to use my own objects in XAML, without wrapping them into a Extension?

2.) If yes, what would be the correct syntax for a Command Parameter?

Thank you.

———————————-

Ok, thank you Dimitri. Here is the solution, as it worked for me now:

Step 1) Import the namespace

xmlns:db="clr-namespace:DB"

Step 2) Using the CLR object as a static resource.

<UserControl.Resources>
   <db:User x:Key="User"/>
</UserControl.Resources>

Step 3) Pass the Object Key, in this case User, to the CommandParameter

CommandParameter="{StaticResource User}

Step 4) Bind the User Object to the desired controls in your UserConrol

Text="{Binding Source={StaticResource User}, Path=EMail, Mode=TwoWay}"

That’s it.

Answer 1

If i understand question, ObjectDataProvider can help to find solution.

p.s. what about simple declaring object as resource and then use it via StaticResource extension.

<Resources>
     <DB:User Id="1" Name="Name" x:Key="User"/>
</Resources>