Jason, I'm not sure about b), but you can do a): just have a look at the System.Delegate.CreateDelegate method.
HTH, Stefan >-----Original Message----- >From: [EMAIL PROTECTED] >[mailto:[EMAIL PROTECTED]] On Behalf >Of Jason Whittington >Sent: Tuesday, December 03, 2002 5:47 AM >To: 'Moderated discussion of advanced .NET topics.' >Subject: System.Delegate needs a new constructor > > >I really wish I could either a) pass an object and a >methodinfo as constructor parameters to a delegate or b) >discover the metadata token for a method from managed code. >If I could do a) then I could say this: > >uint mydelegate(); > >object o = new object(); >mydelegate d = new mydelegate(o, o.GetType().GetMethod("GetHashCode")); > >uint hashcode = d(); > > >Here's an example of why I care. I have a class that >implements a bunch of related methods (all with the same >signature). This class stores delegates to these methods in a >hashtable and has a function like: > >void Call(string label) > >Said class uses the label to key to the desired function. >Now, given the constructor above I could write some really >cool code, namely: > >public HypotheticalClassCtor() >{ > foreach(MethodInfo m in this.GetType().GetMethods()) > { > if(m.Name.IndexOf("Routine_") != -1) > { > //Impossible to do from C#! > MyHashTable[m.Name.Substring(9)] = new >SubroutineDelegate(this,m); > } > } >} > >void Call(string label) >{ >return MyHashTable[label](); >} > >This snazzy bit of code would automatically add any routine in >my class that fit a certain naming convention to the >hashtable. As it is I have to manually put a line in the >constructor for every routine I want added. This is >functional but isn't very sexy :) > >I can get there from here if I can have (b). I can do what I >want if there any way to get the metadata token from a >MethodInfo. Then I could write a little library in IL that >would expose a function that would explicitly create the >delegate with the two parameters that C# is already using. >For future versions of the CLR it would be awesome if >delegates just got a constructor that could take a MethodInfo >like this. Clearly the MethodInfo has the right token buried >in there *somewhere*... > >Any takers? > >Jason > >You can read messages from the Advanced DOTNET archive, >unsubscribe from Advanced DOTNET, or subscribe to other >DevelopMentor lists at http://discuss.develop.com. > You can read messages from the Advanced DOTNET archive, unsubscribe from Advanced DOTNET, or subscribe to other DevelopMentor lists at http://discuss.develop.com.
