generate barcode image vb.net Host-to-Workflow Communication in C#.NET

Drawer UPC Symbol in C#.NET Host-to-Workflow Communication

Host-to-Workflow Communication
UPC-A Supplement 5 Creation In C#
Using Barcode generator for Visual Studio .NET Control to generate, create UPC Symbol image in Visual Studio .NET applications.
www.OnBarcode.com
UPCA Scanner In Visual C#
Using Barcode decoder for Visual Studio .NET Control to read, scan read, scan image in Visual Studio .NET applications.
www.OnBarcode.com
Having introduced the activities in WF that deal with events, I can now fulfill my promise to show you the other half of the workflow/host communication scheme. From 8, you might recall that the CallExternalMethod activity is used by the workflow instance to send information to the host process. The external method that s called is actually a method you
Generating Bar Code In C#
Using Barcode creation for .NET Control to generate, create barcode image in .NET framework applications.
www.OnBarcode.com
Bar Code Scanner In Visual C#.NET
Using Barcode scanner for .NET framework Control to read, scan read, scan image in VS .NET applications.
www.OnBarcode.com
Part II
Create UPC-A Supplement 2 In VS .NET
Using Barcode generation for ASP.NET Control to generate, create GTIN - 12 image in ASP.NET applications.
www.OnBarcode.com
Print UPCA In Visual Studio .NET
Using Barcode creator for .NET Control to generate, create UPC-A Supplement 2 image in Visual Studio .NET applications.
www.OnBarcode.com
Working with Activities
UPC-A Creation In Visual Basic .NET
Using Barcode generator for VS .NET Control to generate, create UPC-A Supplement 5 image in .NET framework applications.
www.OnBarcode.com
Print Barcode In Visual C#.NET
Using Barcode generator for .NET Control to generate, create bar code image in .NET applications.
www.OnBarcode.com
provide that is exposed by a local communications service you write. The service then takes the information destined for the host and fires an event. The event signals the availability of data, and the host can take measures to read the data from the service (which cached the data after receiving it from the workflow). The reverse process, where the host sends data to an already-executing workflow, also involves the local communication service as well as events and the handlers responsible for dealing with those events. When you design the interface to be used for communication between host and workflow (as shown in the Creating Service Interfaces section in 8), the methods you add to the interface are for the workflow to use to send data to the host. Adding events to your interface allows the host to send data to the workflow after it has begun executing. The sample application for this chapter will use each of the activities I ve described. An EventHandlingScope activity will handle a stop processing event. While waiting for that event, a Sequence activity will contain a workflow process that simulates updating stock-market values. As quotes are updated, the new values are passed to the host for inclusion in the user interface (shown in Figure 10-1). The application, eBroker, doesn t actually check the current stock value for each stock ticker symbol, which is the three- to four-character nickname representing the company that issued the stock. It calculates new values using a simple Monte Carlo simulation. A Monte Carlo simulation is a simulation using random numbers, similar to rolling dice to decide an outcome. The intention is to see how workflows and hosts communicate. Although it s not a minor detail, actually checking current stock-market values is a detail I ll omit for this sample.
Creating 2D Barcode In C#.NET
Using Barcode encoder for VS .NET Control to generate, create 2D Barcode image in Visual Studio .NET applications.
www.OnBarcode.com
Creating QR Code In Visual C#
Using Barcode creation for Visual Studio .NET Control to generate, create QR-Code image in Visual Studio .NET applications.
www.OnBarcode.com
Figure 10-1 The eBroker primary user interface
Painting UPC Symbol In Visual C#
Using Barcode creation for VS .NET Control to generate, create UPC-A image in VS .NET applications.
www.OnBarcode.com
Draw USD8 In Visual C#
Using Barcode printer for Visual Studio .NET Control to generate, create USD - 8 image in .NET applications.
www.OnBarcode.com
The eBroker application is able to let the workflow know that new stocks are to be checked or that existing stocks should be removed from consideration. In this case, you can add or remove stock values from the simulation using the Add and Remove buttons. Clicking Add pops up the dialog box you see in Figure 10-2. When you complete the dialog box and click OK, the new watched stock is added to the watched stock list.
Paint Bar Code In Java
Using Barcode generator for Android Control to generate, create barcode image in Android applications.
www.OnBarcode.com
Generate GS1 128 In Java
Using Barcode creator for Java Control to generate, create GS1 128 image in Java applications.
www.OnBarcode.com
10
Create USS Code 128 In Visual Studio .NET
Using Barcode printer for Reporting Service Control to generate, create Code 128A image in Reporting Service applications.
www.OnBarcode.com
Making GTIN - 12 In Objective-C
Using Barcode printer for iPad Control to generate, create UPC-A image in iPad applications.
www.OnBarcode.com
Event Activities
Decoding Bar Code In Visual C#
Using Barcode Control SDK for VS .NET Control to generate, create, read, scan barcode image in .NET framework applications.
www.OnBarcode.com
Code128 Drawer In None
Using Barcode creator for Online Control to generate, create Code 128 Code Set A image in Online applications.
www.OnBarcode.com
Figure 10-2 Adding a new watched stock
Barcode Generator In Java
Using Barcode generator for Android Control to generate, create barcode image in Android applications.
www.OnBarcode.com
PDF417 Drawer In None
Using Barcode drawer for Software Control to generate, create PDF-417 2d barcode image in Software applications.
www.OnBarcode.com
Selecting a symbol in the ticker symbol list enables the Remove button. Clicking the Remove button removes the item from the watched stock list. The removal action is shown in Figure 10-3. The stocks you are monitoring are stored in the application s Settings file (in XML form). The next time you execute eBroker, it will remember your stocks and begin checking anew.
Figure 10-3 Removing an existing watched stock
In Figure 10-2, you see that the application needs to know how many shares you currently have so that it can calculate the total value of the shares you own. These figures are used to calculate the current market value. If you later want to adjust the number of shares (by buying and selling stock), select the stock in the market value list and click either Buy! or Sell! The dialog box you see in Figure 10-4 will request the number of shares you want to buy or sell, and the workflow will be notified.
Figure 10-4 Dialog box requesting number of shares to buy or sell
The Add dialog box in Figure 10-2 also requests buy and sell trigger amounts. The workflow contains business logic that uses these values to notify you when not you should buy or sell shares in any of the companies you are currently monitoring. If the stock price exceeds the sell trigger value, a red flag is displayed in the market list. If the stock price drops below the buy trigger value, a green flag appears. You can buy and sell shares at any time...the flags are just visual indicators. You see a couple of flags in Figure 10-5.
Copyright © OnBarcode.com . All rights reserved.