ASP.NET string resource to lower case?

Question

I'm including a string resource in an ASPX:

<asp:Literal runat="server" Text="<%$ Resources:Global, MyString %>"/>

Let's say the value of MyString is "Home". How can I convert that to lower case ("home") in the resource tag? E.g., I don't want to have to store both upper/title and lower case variants of the string in the resource file.

I realize I could do this normally (outside a control) like this:

<%= Resources.Global.MyString.ToLower() %>

But that doesn't help when I have to use a resource for some property of a control. I was hoping to be able to do something simple such as:

<asp:Literal runat="server" Text="<%$ (Resources:Global, MyString).ToLower() %>"/>

Answer 1

I ended up building my own ExpressionBuilder which uses the built-in ResourceExpressionBuilder to get the underlying resource value and then convert it to lower case:

Convert the Base Expression to a Lower-case String

public class ResourceLowerCase : ResourceExpressionBuilder
{
    public override CodeExpression GetCodeExpression(BoundPropertyEntry entry, object parsedData, ExpressionBuilderContext context)
    {
        CodeExpression getResourceExpression = base.GetCodeExpression(entry, parsedData, context);
        CodeMethodInvokeExpression toStringExpression = new CodeMethodInvokeExpression(getResourceExpression, "ToString");
        CodeMethodInvokeExpression toLowerExpression = new CodeMethodInvokeExpression(toStringExpression, "ToLower");

        return toLowerExpression;
    }
}

Register the Expression Builder

<system.web>
    <expressionBuilders>
        <add expressionPrefix="ResourceLowerCase" type="My.Project.Compilation.ResourceLowerCase"/>
    </expressionBuilders>
</compilation>

Invoke the Expression Builder

<asp:Literal runat="server" Text="<%$ ResourceLowerCase:Global, MyString %>" />