How to declare a decimal value in XAML?

Question

I'm able to declare an integer or double value in xaml. However, I can't add a decimal value. It builds ok, but then I get:

System.Windows.Markup.XamlParseException: The type 'Decimal' was not found.

Here's the xaml code:

<UserControl.Resources>
    <system:Int32 x:Key="AnIntValue">1000</system:Int32><!--Works!-->
    <system:Double x:Key="ADoubleValue">1000.0</system:Double><!--Works!-->
    <system:Decimal x:Key="ADecimalValue">1000.0</system:Decimal><!--Fails at runtime-->
</UserControl.Resources>

Here's how I'm declaring the system namespace:

xmlns:system="clr-namespace:System;assembly=mscorlib"

Edit: Workaround: As Steven mentioned, adding the resource through code-behind seems to work fine:

Resources.Add("ADecimalValue", new Decimal(1000.0));

Edit: Answer: Doing exactly the same thing in WPF seems to work fine. So I guess this is a hidden silverlight restriction. Thanks to Steven for this finding.

I use it in a converter parameter for a binding. I'm referencing it as a static resource. — alf, Aug 16 '11 at 15:59

score 2 · Accepted Answer · edited May 23 '17 at 11:52

2

I have confirmed your finding that the Decimal type does not appear to work as a static resource in a UserControl's resources section. I do however see a couple workarounds that have been discussed here on StackOverflow, and that i have just personally verified to work with the Decimal type in Silverlight: Access codebehind variable in XAML

The workarounds include:

adding the resource from the code-behind (see the link above)
Referencing a property in the code behind using an "elementname" type binding
Accessing a public Decimal property on the user controls data context property.

The second workaround can be done like this:

<sdk:Label Name="label1" Content="{Binding ElementName=root, Path=DecimalProperty}" />

...where the root usercontrol tag is defined like this (this idea is from the link above also):

<UserControl x:Class="SilverlightDecimal.MainPage" x:Name="root" .... >

and this is in your user control's code-behind:

public decimal DecimalProperty
{
    get
    {
        ...
    }
    set
    {
         ...
    }
}

edited May 23 '17 at 11:52

Community

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answered Aug 16 '11 at 16:28

Steven Magana-Zook

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Thanks! The first workaround actually worked. Now I'm looking for an explanation on why I can't declare the resource in XAML. – alf Aug 16 '11 at 17:25
1

I'm glad the workaround worked. Google does not seem to have the answer and i am starting to wonder if it is a bug. From the information i have seen, the type Decimal is contained in mscorlib.dll which is automatically referenced by silverlight projects. Doing pre/post build events to manually make sure that dll was in the build output directory also did not help. – Steven Magana-Zook Aug 16 '11 at 18:11
1

I made a bare bones WPF project and it was perfectly happy with Decimal as a static resource, how strange. – Steven Magana-Zook Aug 17 '11 at 20:04
Ahh, so this might be a hidden silverlight restriction, meaning that my xaml was ok. That's good to know! – alf Aug 17 '11 at 20:10

How to declare a decimal value in XAML?

1 Answers1