code to generate barcode in vb.net Crafting Custom Activities in C#

Painting UPC A in C# Crafting Custom Activities

13
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{ // Retrieve the file. GetFile(); // Work complete, so close. return ActivityExecutionStatus.Closed; }
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Crafting Custom Activities
Paint UPC Symbol In .NET
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Painting Universal Product Code Version A In Visual Studio .NET
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private void GetFile() { // Create the URI. We check the validity again // even though we checked it in the property // setter since binding may have taken place. // Binding shoots the new value directly to the // dependency property, skipping our local // getter/setter logic. Note that if the URL // is very malformed, the URI constructor will // throw an exception. Uri requestUri = new Uri(FtpUrl); if (requestUri.Scheme != Uri.UriSchemeFtp) { // Not a valid FTP URI... throw new ArgumentException("The value assigned to the" + "FtpUrl property is not a valid FTP URI."); } // if string fileName = Path.GetFileName(requestUri.AbsolutePath); if (String.IsNullOrEmpty(fileName)) { // No file to retrieve. return; } // if Stream bitStream = null; FileStream fileStream = null; StreamReader reader = null; try { // Open the connection. FtpWebRequest request = (FtpWebRequest)WebRequest.Create(requestUri); // Establish the authentication credentials. if (!String.IsNullOrEmpty(FtpUser)) { request.Credentials = new NetworkCredential(FtpUser, FtpPassword); } // if else { request.Credentials = new NetworkCredential(AnonymousUser, !String.IsNullOrEmpty(FtpPassword)
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Part II
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Working with Activities
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FtpPassword : AnonymousPassword); } // else // Make the request and retrieve response stream. FtpWebResponse response = (FtpWebResponse)request.GetResponse(); bitStream = response.GetResponseStream(); // Create the local file. fileStream = File.Create(fileName); // Read the stream, dumping bits into local file. byte[] buffer = new byte[1024]; Int32 bytesRead = 0; while ((bytesRead = bitStream.Read(buffer, 0, buffer.Length)) > 0) { fileStream.Write(buffer, 0, bytesRead); } // while } // try finally { // Close the response stream. if (reader != null) reader.Close(); else if (bitStream != null) bitStream.Close(); // Close the file. if (fileStream != null) fileStream.Close(); } // finally } }
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One of the more important things that s left to be done is to create a custom validator. Although you could use the FTP activity as it exists now, it's not completely wired into the visual workflow designer at this point. What it's missing is property validation. Let s see what s involved with adding a validator.
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Creating a Custom ActivityValidator
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By now, I m sure you ve seen the small red circle containing an exclamation mark that appears in activities that have unfinished configurations in the visual workflow designer. A Code activity that has nothing established for its ExecuteCode property will display this indicator, for example. What causes this The answer is that an activity validator forces this behavior. A validator examines the properties of its associated activity and inserts errors into an error collection if any properties are missing or invalid. The validator is asked to reevaluate the rules it applies to the activity
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13
Crafting Custom Activities
properties when the state of the designer changes (that is, when new activities are added or properties change) and when the workflow is compiled. The validator can choose to ignore property configurations, or it can mark them as warnings or outright errors. The FTP activity has three properties, one of which is critical (the URL). The other two can be left untouched, which will cause authentication with the default (anonymous) user. As we complete our validator, we ll mark the lack of a URL (or lack of a binding to a URL property in the main workflow activity) as an error. If the user name or password is omitted we ll generate warnings stating that the anonymous login will be used. Creating a validator for the FtpGetFileActivity workflow activity 1. Activity validators in WF are just classes, so we ll begin by adding a new class to the FtpActivity project. Right-click the FtpActivity project in Visual Studio s Solution Explorer window, select Add, and then select Class. When the Add New Item dialog box appears, type FtpGetFileActivityValidator.cs in the Name field and click the dialog box s Add button. 2. Add the following using statement to the list of preexisting using statements:
using System.Workflow.ComponentModel.Compiler;
3. When the new FtpGetFileActivityValidator class is created, it s created as a private class. Moreover, WF activity validators must use ActivityValidator as a base class. Visual Studio opens the source file for editing, so change the class definition to the following by adding the public keyword as well as the ActivityValidator as the base:
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