An example convention for nancy

ExampleConvention.cs

		public string ResolveViewPath(string appviewpath, string viewname,string modulename,string[] allowedextensions)
		{
			// find all possible extensions for this viewname
			var possibleExtensions = new List<string>();
			var ext = Path.GetExtension(viewname);
			if (string.IsNullOrEmpty(ext))
				possibleExtensions.AddRange(allowedextensions);
			else
				possibleExtensions.Add(ext);
			// get the filename without an extension
			var fn = Path.GetFileNameWithoutExtension(viewname);
			// get the relevant folder
			var folder =Path.GetDirectoryName(viewname);
			// if the modulename ends with "Module", remove that from the modulename
			if (modulename.EndsWith("Module",StringComparison.InvariantCultureIgnoreCase))
				modulename = modulename.Substring(0,modulename.Length-6);
				
			
			foreach(var e in possibleExtensions)
			{
				var newfn = fn+"."+e;
				
				var res = 
					CombinePathsAndVerify(appviewpath,folder,newfn)
					?? CombinePathsAndVerify(appviewpath,folder,modulename,newfn)
					?? CombinePathsAndVerify(appviewpath,modulename,folder,newfn);
				if (res!=null)
					return res;
			}
			throw new Exception();
		}
		
		public static string CombinePathsAndVerify(string fn,params string[] parts)
		{
			string p = null;
			foreach(var prt in parts)
				p = p==null?prt:Path.Combine(p,prt);
			if (File.Exists(p))
				return p;
			else
				return null;
		}