CODEWITHSUNDEEP
c#.netwpfxaml
Radinator
Radinator

Reputation: 1088

Instantiating XAML Object with non-primitive property

What do I have to code to initialize a object with a non-primitive property.

Like when having the following Model and ViewModel:

public class ListEntry
{
    public int ID { get; set; }
    public string IP { get; set; }
}

public class ViewModel
{
    public ObservableCollection<ListEntry> ListEntries { get; set; }
}

then I can code this XAML DesignData:

<nc:ViewModel
    xmlns:nc="clr-namespace:NetWorkItOut.NetworkClasses">
    <nc:ViewModel.ListEntries>
        <nc:ListEntry ID="1" IP="192.168.178.1" />
        <nc:ListEntry ID="2" IP="192.168.178.255" />
    </nc:ViewModel.ListEntries>
</nc:ViewModel>

and everything works. But when replacing

public string IP { get; set; }

with 

public IPAddress IP { get; set; }

this does not work (since IPaddress has no constructor that takes a string.

So how can I solve this? (Displaying the IP Value with the design data)

Upvotes: 0

Views: 71

Answers (2)

Clemens
Clemens

Reputation: 128147

Create a TypeConverter that converts from string to IPAddress:

using System.ComponentModel;
...

public class IPAddressConverter : TypeConverter
{
    public override bool CanConvertFrom(
        ITypeDescriptorContext context, Type sourceType)
    {
        return sourceType == typeof(string);
    }

    public override object ConvertFrom(
        ITypeDescriptorContext context, CultureInfo culture, object value)
    {
        return IPAddress.Parse((string)value);
    }
}

Register the TypeConverter for the IP property like this:

public class ListEntry
{
    public int ID { get; set; }

    [TypeConverter(typeof(IPAddressConverter))]
    public IPAddress IP { get; set; }
}

Upvotes: 1

Fruchtzwerg
Fruchtzwerg

Reputation: 11399

A simple way is to wrap the IPAddress with an additional string property:

public IPAddress IP { get; set; }
public string StringIP
{
    get
    {
        return IP.ToString();
    }
    set
    {
        IP = IPAddress.Parse(value);
    }
}

Now you can use the wrapped property to set the IP:

<nc:ListEntry ID="2" StringIP="192.168.178.255" />

Upvotes: 1

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