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Using a SymbolResolver to access host environment information

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To access environment information from within an activity, you'll need to use the System.Activities.Hosting.SymbolResolver class.

Here's the code to add the symbol resolver to the workflow application:

class Program{    static void Main(string[] args)    {        WorkflowApplication WFApp = new WorkflowApplication(new Workflow1());        SymbolResolver symbolResolver = new SymbolResolver();        WFApp.Extensions.Add(symbolResolver);        symbolResolver.Add("CustomObject", new SymbolUserActivity.MyObject() { MyValue = 1, MyString = "TestString" });        WFApp.Run();        Console.ReadLine();    }}

Here's the code to access the symbol resolver from within an activity:

public sealed class SymbolUser : CodeActivity{    protected override void Execute(CodeActivityContext context)    {        SymbolResolver symbolResolver = context.GetExtension<SymbolResolver>();        MyObject obj = symbolResolver["CustomObject"] as MyObject;        Console.WriteLine(obj.MyString);    }}public class MyObject{    public int MyValue { get; set; }    public string MyString { get; set; }}