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We will discuss references in greater detail in 5, because they are particularly helpful when passing parameters to functions. A properly formatted string can be converted to an XML document: PS C:\> $doc = [xml] "<root><item>1</item></root>" PS C:\> $doc.root.item 1 Script blocks can be converted to .NET delegates. Delegates are a special type of object that point to a method or a block of code. They are typically involved in associating event handler code with the event and are used by objects to fire an event. We usually need to convert a script block to a delegate when working with a .NET type that can fire an event that we want to consume. A number of objects can be created or obtained by converting from a string that contains a name, path, or a query. Here they are: Strings can be converted to character arrays: PS C:\> [char[]]"chars" c h a r s Strings can be turned to regular expressions. The string is treated as the match pattern: PS C:\> ([regex] "a.* b").GetType().FullName System.Text.RegularExpressions.Regex Strings can also create WMI objects (I will demonstrate the power of those conversions in 20, where we will work with WMI): PS C:\> [wmisearcher]'Select * from Win32_Process'

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When developing a custom activity, you have the option of providing design-time validation. The most common type of validation checks for missing properties, but you can perform any validation logic that you need. For instance, if your activity is a composite, you can verify that a child activity of a specified type has been added. The goal of validation is to assist the developer at design time by identifying error and warning conditions. A custom activity that provides this type of validation enhances the design experience by providing cues to the proper use of the activity. The developer doesn t have to wait until the workflow is executed to find out that a property was not set. They are notified of missing properties and other errors at design time via visual cues in the designer along with compiler warnings and errors. Adding validation to a custom activity consists of two steps: 1. Implementing a custom validator class 2. Assigning the validator class to the custom activity class The custom validator class must derive directly or indirectly from the Validator class (found in the System.Workflow.ComponentModel.Compiler namespace). There are several classes supplied with WF that derive from Validator, but these two are most commonly used as a base class for a custom validator: ActivityValidator: A base validator class used for simple activities CompositeActivityValidator: A base validator class used for composite activities

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24 Sep 2015 ... The article will illustrate how to create a Code39 barcode in VB. NET and C#.

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Figure 5-5. SQL Server 2008 Express Web Installation Page 3. If prompted to install the Microsoft Web Platform Installer, follow the steps given.

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To illustrate adding validation to an activity, this example develops a simple custom activity, implements a validation class, and then assigns the validation class to the activity. To start the example, create a new workflow project using the Empty Workflow Project template. This creates a DLL assembly that can be referenced by other projects. A DLL assembly is more appropriate when you want to add custom activities to the Toolbox. Assign the project the name CustomActivityComponents. Select Add Activity from the Project menu to create a new custom activity, and name the new activity MyCustomActivity. After changing to the code view for MyCustomActivity.cs, change the base class for the activity from SequenceActivity to Activity. This changes the activity from a composite to a simple activity. Next, the activity needs properties to validate, so add these dependency properties to the activity: MyString: A String property MyInt: An Int32 property Listing 3-10 shows the code for MyCustomActivity.cs after the dependency properties have been added. Listing 3-10. MyCustomActivity.cs with Dependency Properties using using using using using System; System.ComponentModel; System.Workflow.ComponentModel; System.Workflow.ComponentModel.Compiler; System.Workflow.Activities;

: System.Management.ManagementScope : System.Management.ObjectQuery : System.Management.EnumerationOptions : :

namespace CustomActivityComponents { /// <summary> /// A custom activity that demonstrates activity components /// </summary> public partial class MyCustomActivity : Activity { public MyCustomActivity() { InitializeComponent(); } public static DependencyProperty MyStringProperty = System.Workflow.ComponentModel.DependencyProperty.Register( "MyString", typeof(string), typeof(MyCustomActivity)); [Description("A String property")] [Category("Custom Activity Components")] [Browsable(true)] [DesignerSerializationVisibility(DesignerSerializationVisibility.Visible)] public string MyString { get { return ((string)(base.GetValue( MyCustomActivity.MyStringProperty))); } set { base.SetValue(MyCustomActivity.MyStringProperty, value); } } public static DependencyProperty MyIntProperty = System.Workflow.ComponentModel.DependencyProperty.Register( "MyInt", typeof(Int32), typeof(MyCustomActivity)); [Description("An Int32 property")] [Category("Custom Activity Components")] [Browsable(true)] [DesignerSerializationVisibility(DesignerSerializationVisibility.Visible)] public Int32 MyInt { get { return ((Int32)(base.GetValue(MyCustomActivity.MyIntProperty))); } set { base.SetValue(MyCustomActivity.MyIntProperty, value); } } } }

PS C:\> [WMI]'\\.\root\cimv2:Win32_Process.Handle=0' ProcessName : System Idle Process PS C:\> ([wmiclass] "Win32_Share").GetType().FullName System.Management.ManagementClass

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Code39 Barcodes in VB. NET and C# - CodeProject
24 Sep 2015 ... Introduction. The purpose of this article is to create a simple class that will generate the image of a Code 39 barcode from a string as input.

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