StackOverflow2013

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1670817
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0
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2009-11-03T23:25:48.867
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2009-11-03T23:25:48.867
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199245
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1665267
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7
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text
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In my Emerald Data Foundation (EDF) tool I solved this by creating a more powerful MarkupExtension than x:Type that could specify generic types too. That way I could write: <pre><code> <DataTemplate TargetType="{edf:Type generic:ICollection{local:Entity}}" /> </code></pre> Here's what I used: <pre><code> [MarkupExtensionReturnType(typeof(Type))] public class TypeExtension : MarkupExtension { public TypeExtension() { } public TypeExtension(string typeName) { TypeName = typeName; } public TypeExtension(Type type) { Type = type; } public string TypeName { get; set; } public Type Type { get; set; } public override object ProvideValue(IServiceProvider serviceProvider) { if(Type==null) { IXamlTypeResolver typeResolver = serviceProvider.GetService(typeof(IXamlTypeResolver)) as IXamlTypeResolver; if(typeResolver==null) throw new InvalidOperationException("EDF Type markup extension used without XAML context"); if(TypeName==null) throw new InvalidOperationException("EDF Type markup extension used without Type or TypeName"); Type = ResolveGenericTypeName(TypeName, (name) => { Type result = typeResolver.Resolve(name); if(result==null) throw new Exception("EDF Type markup extension could not resolve type " + name); return result; }); } return Type; } public static Type ResolveGenericTypeName(string name, Func<string, Type> resolveSimpleName) { if(name.Contains('{')) name = name.Replace('{', '<').Replace('}', '>'); // Note: For convenience working with XAML, we allow {} instead of <> for generic type parameters if(name.Contains('<')) { var match = _genericTypeRegex.Match(name); if(match.Success) { Type[] typeArgs = ( from arg in match.Groups["typeArgs"].Value.SplitOutsideParenthesis(',') select ResolveGenericTypeName(arg, resolveSimpleName) ).ToArray(); string genericTypeName = match.Groups["genericTypeName"].Value + "`" + typeArgs.Length; Type genericType = resolveSimpleName(genericTypeName); if(genericType!=null && !typeArgs.Contains(null)) return genericType.MakeGenericType(typeArgs); } } return resolveSimpleName(name); } static Regex _genericTypeRegex = new Regex(@"^(?<genericTypeName>\w+)<(?<typeArgs>\w+(,\w+)*)>$"); } </code></pre> The generic type name parsing code is in a separate method because it is also used by some other code in EDF. You could combine it all into one method.
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1. PODataTemplate.DataType = Collection<Entity>?
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1. USRay Burns
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