IIdentifierCreationService 接口

参考

定义

命名空间:: System.Workflow.ComponentModel.Design

程序集:: System.Workflow.ComponentModel.dll

重要

一些信息与预发行产品相关，相应产品在发行之前可能会进行重大修改。对于此处提供的信息，Microsoft 不作任何明示或暗示的担保。

注意

The System.Workflow.* types are deprecated. Instead, please use the new types from System.Activities.*

提供一个用于创建在指定的活动范围内唯一地命名的标识符的机制。

public interface class IIdentifierCreationService

public interface IIdentifierCreationService

[System.Obsolete("The System.Workflow.* types are deprecated.  Instead, please use the new types from System.Activities.*")]
public interface IIdentifierCreationService

type IIdentifierCreationService = interface

[<System.Obsolete("The System.Workflow.* types are deprecated.  Instead, please use the new types from System.Activities.*")>]
type IIdentifierCreationService = interface

Public Interface IIdentifierCreationService

属性: ObsoleteAttribute

示例

下面的示例演示 IIdentifierCreationService 的实现。此服务确保当前工作流中使用的每个标识符都是唯一的。

internal sealed class IdentifierCreationService : IIdentifierCreationService
{
    private IServiceProvider serviceProvider = null;

    internal IdentifierCreationService(IServiceProvider serviceProvider)
    {
        this.serviceProvider = serviceProvider;
    }

    void IIdentifierCreationService.ValidateIdentifier(Activity activity, string identifier)
    {
        if (identifier == null)
            throw new ArgumentNullException("identifier");
        if (activity == null)
            throw new ArgumentNullException("activity");

        if (activity.Name.ToLower().Equals(identifier.ToLower()))
            return;

        ArrayList identifiers = new ArrayList();
        Activity rootActivity = GetRootActivity(activity);
        identifiers.AddRange(GetIdentifiersInCompositeActivity(rootActivity as CompositeActivity));
        identifiers.Sort();
        if (identifiers.BinarySearch(identifier.ToLower(), StringComparer.OrdinalIgnoreCase) >= 0)
            throw new ArgumentException(string.Format("Duplicate Component Identifier {0}", identifier));
    }

    void IIdentifierCreationService.EnsureUniqueIdentifiers(CompositeActivity parentActivity, ICollection childActivities)
    {
        if (parentActivity == null)
            throw new ArgumentNullException("parentActivity");
        if (childActivities == null)
            throw new ArgumentNullException("childActivities");

        List<Activity> allActivities = new List<Activity>();

        Queue activities = new Queue(childActivities);
        while (activities.Count > 0)
        {
            Activity activity = (Activity)activities.Dequeue();
            if (activity is CompositeActivity)
            {
                foreach (Activity child in ((CompositeActivity)activity).Activities)
                    activities.Enqueue(child);
            }

            //If we are moving activities, we need not regenerate their identifiers
            if (((IComponent)activity).Site != null)
                continue;

            allActivities.Add(activity);
        }

        // get the root activity
        CompositeActivity rootActivity = GetRootActivity(parentActivity) as CompositeActivity;
        ArrayList identifiers = new ArrayList(); // all the identifiers in the workflow
        identifiers.AddRange(GetIdentifiersInCompositeActivity(rootActivity));

        foreach (Activity activity in allActivities)
        {
            string finalIdentifier = activity.Name;

            // now loop until we find a identifier that hasn't been used.
            string baseIdentifier = GetBaseIdentifier(activity);
            int index = 0;

            identifiers.Sort();
            while (finalIdentifier == null || finalIdentifier.Length == 0 || identifiers.BinarySearch(finalIdentifier.ToLower(), StringComparer.OrdinalIgnoreCase) >= 0)
            {
                finalIdentifier = string.Format("{0}{1}", baseIdentifier, ++index);
            }

            // add new identifier to collection
            identifiers.Add(finalIdentifier);
            activity.Name = finalIdentifier;
        }
    }

    private static IList GetIdentifiersInCompositeActivity(CompositeActivity compositeActivity)
    {
        ArrayList identifiers = new ArrayList();
        if (compositeActivity != null)
        {
            identifiers.Add(compositeActivity.Name);
            IList<Activity> allChildren = GetAllNestedActivities(compositeActivity);
            foreach (Activity activity in allChildren)
                identifiers.Add(activity.Name);
        }
        return ArrayList.ReadOnly(identifiers);
    }

    private static string GetBaseIdentifier(Activity activity)
    {
        string baseIdentifier = activity.GetType().Name;
        StringBuilder b = new StringBuilder(baseIdentifier.Length);
        for (int i = 0; i < baseIdentifier.Length; i++)
        {
            if (char.IsUpper(baseIdentifier[i]) && (i == 0 || i == baseIdentifier.Length - 1 || char.IsUpper(baseIdentifier[i + 1])))
            {
                b.Append(char.ToLower(baseIdentifier[i]));
            }
            else
            {
                b.Append(baseIdentifier.Substring(i));
                break;
            }
        }
        return b.ToString();
    }

    private static Activity GetRootActivity(Activity activity)
    {
        if (activity == null)
            throw new ArgumentException("activity");

        while (activity.Parent != null)
            activity = activity.Parent;

        return activity;
    }

    private static Activity[] GetAllNestedActivities(CompositeActivity compositeActivity)
    {
        if (compositeActivity == null)
            throw new ArgumentNullException("compositeActivity");

        ArrayList nestedActivities = new ArrayList();
        Queue compositeActivities = new Queue();
        compositeActivities.Enqueue(compositeActivity);
        while (compositeActivities.Count > 0)
        {
            CompositeActivity compositeActivity2 = (CompositeActivity)compositeActivities.Dequeue();

            foreach (Activity activity in compositeActivity2.Activities)
            {
                nestedActivities.Add(activity);
                if (activity is CompositeActivity)
                    compositeActivities.Enqueue(activity);
            }

            foreach (Activity activity in compositeActivity2.EnabledActivities)
            {
                if (!nestedActivities.Contains(activity))
                {
                    nestedActivities.Add(activity);
                    if (activity is CompositeActivity)
                        compositeActivities.Enqueue(activity);
                }
            }
        }
        return (Activity[])nestedActivities.ToArray(typeof(Activity));
    }
}

Friend NotInheritable Class IdentifierCreationService
    Implements IIdentifierCreationService
    Private serviceProvider As IServiceProvider = Nothing

    Friend Sub New(ByVal serviceProvider As IServiceProvider)
        Me.serviceProvider = serviceProvider
    End Sub

    Sub ValidateIdentifier(ByVal activity As Activity, ByVal identifier As String) Implements IIdentifierCreationService.ValidateIdentifier
        If identifier Is Nothing Then
            Throw New ArgumentNullException("identifier")
        End If
        If activity Is Nothing Then
            Throw New ArgumentNullException("activity")
        End If
        If activity.Name.ToLower().Equals(identifier.ToLower()) Then
            Return
        End If
        Dim identifiers As New ArrayList()
        Dim rootActivity As Activity = GetRootActivity(activity)
        identifiers.AddRange(GetIdentifiersInCompositeActivity(CType(rootActivity, CompositeActivity)))
        identifiers.Sort()
        If identifiers.BinarySearch(identifier.ToLower(), StringComparer.OrdinalIgnoreCase) >= 0 Then
            Throw New ArgumentException(String.Format("Duplicate Component Identifier 0}", identifier))
        End If
    End Sub

    Sub EnsureUniqueIdentifiers(ByVal parentActivity As CompositeActivity, ByVal childActivities As ICollection) Implements IIdentifierCreationService.EnsureUniqueIdentifiers

        If parentActivity Is Nothing Then
            Throw New ArgumentNullException("parentActivity")
        End If
        If childActivities Is Nothing Then
            Throw New ArgumentNullException("childActivities")
        End If
        Dim allActivities As New List(Of Activity)()

        Dim activities As New Queue(childActivities)
        While activities.Count > 0

            Dim activity As Activity = CType(activities.Dequeue(), Activity)
            If TypeOf activity Is CompositeActivity Then
                For Each child As Activity In CType(activity, CompositeActivity).Activities
                    activities.Enqueue(child)
                Next
            End If

            'If we are moving activities, we need not regenerate their identifiers
            If CType(activity, IComponent).Site IsNot Nothing Then
                Continue While
            End If

            allActivities.Add(activity)
        End While

        ' get the root activity
        Dim rootActivity As CompositeActivity = CType(GetRootActivity(parentActivity), CompositeActivity)
        Dim identifiers As New ArrayList() ' all the identifiers in the workflow
        identifiers.AddRange(GetIdentifiersInCompositeActivity(rootActivity))

        For Each activity As Activity In allActivities

            Dim finalIdentifier As String = activity.Name

            ' now loop until we find a identifier that hasn't been used.
            Dim baseIdentifier As String = GetBaseIdentifier(activity)
            Dim index As Integer = 0

            identifiers.Sort()
            While finalIdentifier Is Nothing Or _
            finalIdentifier.Length = 0 Or _
            identifiers.BinarySearch(finalIdentifier.ToLower(), StringComparer.OrdinalIgnoreCase) >= 0
                finalIdentifier = String.Format("0}1}", baseIdentifier, ++index)
            End While

            ' add new identifier to collection 
            identifiers.Add(finalIdentifier)
            activity.Name = finalIdentifier
        Next
    End Sub

    Private Shared Function GetIdentifiersInCompositeActivity(ByVal CompositeActivity As CompositeActivity) As IList
        Dim identifiers As New ArrayList()
        If CompositeActivity IsNot Nothing Then
            identifiers.Add(CompositeActivity.Name)
            Dim allChildren As IList(Of Activity) = GetAllNestedActivities(CompositeActivity)
            For Each activity As Activity In allChildren
                identifiers.Add(activity.Name)
            Next
        End If

        Return ArrayList.ReadOnly(identifiers)
    End Function

    Private Shared Function GetBaseIdentifier(ByVal activity As Activity)
        Dim baseIdentifier As String = activity.GetType().Name
        Dim b As New StringBuilder(baseIdentifier.Length)
        For i As Integer = 0 To baseIdentifier.Length
            If Char.IsUpper(baseIdentifier(i)) And (i = 0 Or i = baseIdentifier.Length - 1 Or Char.IsUpper(baseIdentifier(i + 1))) Then
                b.Append(Char.ToLower(baseIdentifier(i)))
            Else
                b.Append(baseIdentifier.Substring(i))
                Exit For
            End If
        Next
        Return b.ToString()
    End Function

    Private Shared Function GetRootActivity(ByVal activity As Activity) As Activity
        If activity Is Nothing Then
            Throw New ArgumentException("activity")
        End If

        While activity.Parent IsNot Nothing
            activity = activity.Parent
        End While

        Return activity
    End Function

    Private Shared Function GetAllNestedActivities(ByVal compositeActivity As CompositeActivity) As Activity()

        If compositeActivity Is Nothing Then
            Throw New ArgumentNullException("compositeActivity")
        End If

        Dim nestedActivities As New ArrayList()
        Dim compositeActivities As New Queue()
        compositeActivities.Enqueue(compositeActivity)
        While compositeActivities.Count > 0

            Dim compositeActivity2 As CompositeActivity = CType(compositeActivities.Dequeue(), CompositeActivity)

            For Each activity As Activity In compositeActivity2.Activities
                nestedActivities.Add(activity)
                If activity Is compositeActivity Then
                    compositeActivities.Enqueue(activity)
                End If
            Next

            For Each activity As Activity In compositeActivity2.EnabledActivities
                If Not nestedActivities.Contains(activity) Then
                    nestedActivities.Add(activity)
                    If (activity Is compositeActivity) Then
                        compositeActivities.Enqueue(activity)
                    End If
                End If
            Next
        End While
        Return CType(nestedActivities.ToArray(GetType(Activity)), Activity())
    End Function

注解

备注

本材料讨论的类型和命名空间已废弃不用。有关详细信息，请参阅 Windows Workflow Foundation 4.5 中弃用的类型。

IIdentifierCreationService 提供一个用于创建在某个活动范围内唯一地命名的标识符的机制。

方法

EnsureUniqueIdentifiers(CompositeActivity, ICollection)	提供一个用于确保添加到 CompositeActivity 中的活动都是唯一命名的活动的机制。
ValidateIdentifier(Activity, String)	提供一个用于测试标识符在 Activity 中是否唯一的机制。

适用于

通过

IIdentifierCreationService 接口

定义

示例

注解

方法

适用于

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