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CodeActivity Class

An abstract class for creating a custom activity with imperative behavior defined with the Execute(CodeActivityContext) method, which gives access to variable and argument resolution and extensions.

Namespace:  System.Activities
Assembly:  System.Activities (in System.Activities.dll)

public ref class CodeActivity abstract : public Activity

The CodeActivity type exposes the following members.

  NameDescription
Protected methodCodeActivityWhen implemented in a derived class, creates an instance of the derived class.
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  NameDescription
Protected propertyCacheIdGets the identifier of the cache that is unique within the scope of the workflow definition. (Inherited from Activity.)
Protected propertyConstraintsGets a collection of Constraint activities that can be configured to provide validation for the Activity. (Inherited from Activity.)
Public propertyDisplayNameGets or sets an optional friendly name that is used for debugging, validation, exception handling, and tracking. (Inherited from Activity.)
Public propertyIdGets an identifier that is unique in the scope of the workflow definition. (Inherited from Activity.)
Protected propertyImplementationNot supported. (Overrides Activity::Implementation.)
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  NameDescription
Protected methodCacheMetadata(ActivityMetadata)Not implemented. Use CacheMetadata(CodeActivityMetadata) instead. (Overrides Activity::CacheMetadata(ActivityMetadata).)
Protected methodCacheMetadata(CodeActivityMetadata)Creates and validates a description of the activity’s arguments, variables, child activities, and activity delegates.
Public methodEquals(Object)Determines whether the specified Object is equal to the current Object. (Inherited from Object.)
Protected methodExecuteWhen implemented in a derived class, performs the execution of the activity.
Protected methodFinalizeAllows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.)
Public methodGetHashCodeServes as a hash function for a particular type. (Inherited from Object.)
Public methodGetTypeGets the Type of the current instance. (Inherited from Object.)
Protected methodMemberwiseCloneCreates a shallow copy of the current Object. (Inherited from Object.)
Public methodShouldSerializeDisplayNameIndicates whether the DisplayName property should be serialized. (Inherited from Activity.)
Public methodToStringReturns a String that contains the Id and DisplayName of the Activity. (Inherited from Activity.)
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The following example shows how to implement a CodeActivity-derived activity.


public sealed class MessageBox : CodeActivity
{
    public InArgument<string> Text{ get; set; }

    protected override void Execute(CodeActivityContext context)
    {
        System.Windows.Forms.MessageBox.Show(this.Text.Get(context));
    }
}


.NET Framework

Supported in: 4

.NET Framework Client Profile

Supported in: 4

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

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