I have an application that displays several types of widgets. I pass the view the base abstract class, GraphWidget. The goal is to loop through those, and create the appropriate display for each type of graph.
How would I go about looping through that collection and obtaining the appropriate information from the derived class so my view knows how to render each widget?
EDIT This is a .NET MVC5 application
Sample code:
public abstract class GraphWidget {
public abstract string Display();
public string Title {get; set;}
public GraphWidget(string title){
this.Title = title;
}
}
public class BarGraph : GraphWidget{
public override string Display(){
return stuff...
}
}
So for example, if I have a mix of bar graphs and pie graphs, their Display() function will be different. I want to make sure, in my razor view, which is accepting an IEnumerable, that I can properly display each item.
You can use the "is" operator to test if your GraphWidgets are of a certain derived class:
var graphs = new List<GraphWidget>{new BarGraph("Bar"), new PieGraph("Pie")};
foreach(var graph in graphs)
{
if (graph is BarGraph)
{ // it's a BarGraph
}
else if (graph is PieGraph)
{ // it's a PieGraph
}
}
If you need use them as the derived class, then you can use the "as" operator:
/* Note: if graph is actually of type PieGraph,
then barGraph would be null */
var barGraph = graph as BarGraph;
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