vb.net 2d barcode generator public class FtpGetFileActivityValidator : ActivityValidator in Visual C#.NET

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public class FtpGetFileActivityValidator : ActivityValidator
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4. To actually perform validation yourself, you must override the Validate method. Here, you ll examine the properties, and if they re lacking, you ll add an error to an errors collection the designer maintains. Here is the completed Validate override you need to add to the FtpGetFileActivityValidator class:
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public override ValidationErrorCollection Validate(ValidationManager manager, object obj) { FtpGetFileActivity fget = obj as FtpGetFileActivity; if (null == fget) throw new InvalidOperationException(); ValidationErrorCollection errors = base.Validate(manager, obj); if (null != fget.Parent) { // Now actually validate the activity... if (String.IsNullOrEmpty(fget.FtpUrl) && fget.GetBinding(FtpGetFileActivity.FtpUrlProperty) == null) { ValidationError err = new ValidationError("Note you must specify a URL " +
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Working with Activities
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"(including filename) for the FTP server.", 100, false); errors.Add(err); } // if Uri tempUri = null; if (Uri.TryCreate(fget.FtpUrl, UriKind.Absolute, out tempUri)) { if (tempUri.Scheme != Uri.UriSchemeFtp) { ValidationError err = new ValidationError("The FTP URL must be set to an" + " FTP endpoint.", 101, false); errors.Add(err); } // if } // if else if (!String.IsNullOrEmpty(fget.FtpUrl)) { ValidationError err = new ValidationError("The FTP URL must be a valid FTP URI.", 102, false); errors.Add(err); } // else if if (String.IsNullOrEmpty(fget.FtpUser) && fget.GetBinding(FtpGetFileActivity.FtpUserProperty) == null) { ValidationError err = new ValidationError("The 'anonymous' user account will " + "be used for logging in to the FTP server.", 200, true); errors.Add(err); } // if if (String.IsNullOrEmpty(fget.FtpPassword) && fget.GetBinding(FtpGetFileActivity.FtpPasswordProperty) == null) { ValidationError err = new ValidationError("The default anonymous password " + "'someone@example.com' will be used for logging " + "in to the FTP server.", 300, true); errors.Add(err); } // if } return errors; }
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5. The FtpGetFileActivityValidator class is now complete, but we ve not actually told WF to perform validation. To do that, return to the FtpGetFileActivity class and add the following attribute prior to the class definition:
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[ActivityValidator(typeof(FtpGetFileActivityValidator))]
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6. Press Shift+F6, or select Build FtpActivity from Visual Studio s Build menu to build the FtpActivity project, correcting any errors that might result. The completed validator is shown in Listing 13-2. Now, when you drop the FtpGetFileActivity into your workflow, if you forget to assign the URL or you don t create a binding that provides the URL, the workflow won t compile. Also, you ll receive warnings if you don t provide a user name or password, or at least bind these properties using the Properties pane in Visual Studio.
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13
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Crafting Custom Activities
Listing 13-2
using using using using
FtpGetFileActivityValidator.cs completed
System; System.Collections.Generic; System.Text; System.Workflow.ComponentModel.Compiler;
namespace FtpActivity { public class FtpGetFileActivityValidator : ActivityValidator { public override ValidationErrorCollection Validate(ValidationManager manager, object obj) { FtpGetFileActivity fget = obj as FtpGetFileActivity; if (null == fget) throw new InvalidOperationException(); ValidationErrorCollection errors = base.Validate(manager, obj); if (null != fget.Parent) { // Now actually validate the activity... if (String.IsNullOrEmpty(fget.FtpUrl) && fget.GetBinding(FtpGetFileActivity.FtpUrlProperty) == null) { ValidationError err = new ValidationError("Note you must specify a " + "URL (including filename) for the FTP server.", 100, false); errors.Add(err); } // if Uri tempUri = null; if (Uri.TryCreate(fget.FtpUrl, UriKind.Absolute, out tempUri)) { if (tempUri.Scheme != Uri.UriSchemeFtp) { ValidationError err = new ValidationError("The FTP URL must be" + " set to an FTP endpoint.", 101, false); errors.Add(err); } // if } // if else if (!String.IsNullOrEmpty(fget.FtpUrl)) { ValidationError err = new ValidationError("The FTP URL must be a valid" + " FTP URI.", 102, false); errors.Add(err); } // else if if (String.IsNullOrEmpty(fget.FtpUser) && fget.GetBinding(FtpGetFileActivity.FtpUserProperty) ==
Part II
Working with Activities
null) { ValidationError err = new ValidationError("The 'anonymous' user " + "account will be used for logging in to the " + "FTP server.", 200, true); errors.Add(err); } // if if (String.IsNullOrEmpty(fget.FtpPassword) && fget.GetBinding(FtpGetFileActivity.FtpPasswordProperty) == null) { ValidationError err = new ValidationError("The default anonymous " + "password 'someone@example.com' will be used " + "for logging in to the FTP server.", 300, true); errors.Add(err); } // if } return errors; } }
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