indexed-properties

I am trying to bind an indexed property with two indexers. The property looks like this public Item this[int x, int y] { get { return _items[x, y]; } set { _items[x, y] = value; } } According to http://msdn.microsoft.com/en-us/library/ms742451.aspx , it is possible to bind against indexed properties like that <object Path="propertyName[index,index2...]" .../> There is even an example: <Rectangle Fill="{Binding ColorGrid[20,30].SolidColorBrushResult}" .../> However when I try to access that property in XAML like that: <Image Source="{Binding Items[0,0].Image}" /> I get an error in the designer:

I have a simple class that has one of its properties as a String array. As per this document, using @Valid on an array, collection etc. will recursively validate each element of the array/collection. @Valid @Pattern(regexp="^[_ A-Za-z0-9]+$") public String[] defaultAppAdminRoles; the above annotation on the property generates the following exception: Exception in thread "main" javax.validation.UnexpectedTypeException: No validator could be found for type java.lang.String[]. See: @Pattern at public java.lang.String[] com.hm.vigil.platform.ops.model.Application.defaultAppAdminRoles at org.apache

A few languages - like Delphi - has a very convenient way of creating indexers: not only the whole class, but even single properties can be indexed, for instance: type TMyClass = class(TObject) protected function GetMyProp(index : integer) : string; procedure SetMyProp(index : integer; value : string); public property MyProp[index : integer] : string read GetMyProp write SetMyProp; end; This can be used easily: var c : TMyClass; begin c = TMyClass.Create; c.MyProp[5] := 'Ala ma kota'; c.Free; end; Is there a way to achieve the same effect in C# easily? The well-known solution is to create a

In C# I find indexed properties extremely useful. For example: var myObj = new MyClass(); myObj[42] = "hello"; Console.WriteLine(myObj[42]); However as far as I know there is no syntactic sugar to support fields that themselves support indexing (please correct me if I am wrong). For example: var myObj = new MyClass(); myObj.field[42] = "hello"; Console.WriteLine(myObj.field[42]); The reason I need this is that I am already using the index property on my class, but I have GetNumX() , GetX() , and SetX() functions as follows: public int NumTargetSlots { get { return _Maker.NumRefs; } } public

I know, I know... Eric Lippert's answer to this kind of question is usually something like " because it wasn't worth the cost of designing, implementing, testing and documenting it ". But still, I'd like a better explanation... I was reading this blog post about new C# 4 features , and in the section about COM Interop, the following part caught my attention : By the way, this code uses one more new feature: indexed properties (take a closer look at those square brackets after Range.) But this feature is available only for COM interop; you cannot create your own indexed properties in C# 4.0 .