system.activities.presentation.metadata

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System.Activities.Presentation not supported in .net 5

Recently i migrated my wpf application from .net framework 4.7.2 to .net 5 with the help of upgrade assistant tool, but after upgrading System.Activities.Presentation is not supported in .net 5. Please suggest how can i proceed further.

workflow-foundation-4

.NET 5 is .NET Core 5, and WF was never migrated to .NET Core. WF never really caught on outside Microsoft apps, and the lack of web support was a huge reason. The quirky XML file format was another reason. BTW .NET 5 goes out of support in a couple of months. The current long term support version is .NET. – Panagiotis Kanavos Commented Jan 24, 2022 at 10:03
WF went out of fashion almost 10 years ago. There are some attempts to port it to .NET Core, eg by CoreWF by UiPath , an RPA vendor. The Github repo explains this is an experimental project though. You should seriously consider migrating to a different workflow library. NuGet contains several Workflow engine packages – Panagiotis Kanavos Commented Jan 24, 2022 at 10:12

.NET 5 is .NET Core 5, and WF was never migrated to .NET Core. The What's New page in .NET 5 page mentions this explicitly and suggests using an open source alternative , Elsa Workflow . There are other NuGet packages too, each with its own unique feature set

WF never really caught on outside Microsoft apps, for several reasons, and was essentially in maintenance mode by 2013. Even Microsoft products stopped using WF almost a decade ago - SharePoint replaced WF with Workflow Manager in 2013 and even that was replaced by Power Automate workflows . WF workflows were removed entirely in 2020

There are some attempts to port WF to .NET Core, eg by CoreWF by UiPath , an RPA vendor. The Github repo explains this is an experimental project though.

You should seriously evaluate migrating to a different workflow library sooner or later. The reasons WF was abandoned are still valid today:

WF was a workflow engine construction framework, not an actual workflow engine. You need to put a lot of effort to construct an actual workflow engine on top of it.
Too heavy for web applications
The XML format was too quirky to use - it was an object serialization format, not a workflow description, making it way too verbose to generate or edit with other tools.

The alternatives nowadays are:

Other .NET Workflow engines in NuGet, like WorkflowCore and Elsa Workflow to name just two popular packages.
Open source Workflow services in other languages. With Docker and containers, it's now easy to add a workflow service to your web farm, even on Windows Server
Cloud based workflow services.

What you migrate to will depend on the application type. If you need to embed a workflow engine to your desktop application, a workflow library is necessary. If the workflow needs to run on the server side you could use a workflow service or cloud service.

Great observation about WF XML being an object serialization format. MS called it "XAML", but unlike WPF XAML, you couldn't easily edit it directly. – Jim Foye Commented Jan 24, 2022 at 14:50

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File:
Project: (System.Activities.Core.Presentation)

// Copyright (c) Microsoft Corporation. All rights reserved. //---------------------------------------------------------------- System.Activities.Core.Presentation { System.Activities.Presentation; System.Activities.Presentation.Converters; System.Activities.Presentation.Metadata; System.Activities.Presentation.Model; System.Activities.Presentation.PropertyEditing; System.Activities.Presentation.View; System.Activities.Statements; System.Activities.Validation; System.Collections.ObjectModel; System.ComponentModel; System.ServiceModel; System.ServiceModel.Activities; System.ServiceModel.Activities.Presentation; System.ServiceModel.Activities.Presentation.Converters; System.ServiceModel.Presentation; System.Xml.Linq; : IRegisterMetadata { // Called by the designer to register any design-time metadata. // // Be aware of the accidential performance impact when adding things into this method. // In particular, pay attention to calls that will lead to loading extra assemblies. // () { AttributeTableBuilder builder = AttributeTableBuilder(); //shared component builder.AddCustomAttributes( ( < >), ( )); builder.AddCustomAttributes( ( ), EditorReuseAttribute( )); builder.AddCustomAttributes( ( ), EditorReuseAttribute( )); builder.AddCustomAttributes( ( ), EditorReuseAttribute( )); //Flowchart activities . (builder); . (builder); . (builder); // Messaging activities . (builder); // Registering inline for designers for InitializeCorrelation, Send, Receive, SendReply, ReceiveReply activities to avoid calling // their static constructors. This will avoid instantiating the ResourceDictionary for their PropertyValueEditors during designer load. builder.AddCustomAttributes( ( ), ( ( ))); builder.AddCustomAttributes( ( ), ActivityDesignerOptionsAttribute { AllowDrillIn = }); builder.AddCustomAttributes( ( ), ( ( ))); builder.AddCustomAttributes( ( ), ActivityDesignerOptionsAttribute { AllowDrillIn = }); builder.AddCustomAttributes( ( ), FeatureAttribute( ( ))); builder.AddCustomAttributes( ( ), ( ( ))); builder.AddCustomAttributes( ( ), ActivityDesignerOptionsAttribute { AllowDrillIn = }); CutCopyPasteHelper.AddDisallowedTypeForCopy( ( )); builder.AddCustomAttributes( ( ), FeatureAttribute( ( ))); builder.AddCustomAttributes( ( ), ( ( ))); builder.AddCustomAttributes( ( ), ActivityDesignerOptionsAttribute { AllowDrillIn = }); CutCopyPasteHelper.AddDisallowedTypeForCopy( ( )); builder.AddCustomAttributes( ( ), ( ( ))); builder.AddCustomAttributes( ( ), ActivityDesignerOptionsAttribute { AllowDrillIn = }); . (builder); . (builder); //Procedural activities . (builder); . (builder); . (builder); . (builder); . (builder); . (builder); . (builder); . (builder); . (builder); . (builder); . (builder); . (builder); //Compensation/Transaction . (builder); . (builder); . (builder); //Misc activities . (builder); . (builder); . (builder); . (builder); . (builder); // StateMachine . (builder); . (builder); . (builder); builder.AddCustomAttributes( ( <>), FeatureAttribute( (UpdatableGenericArgumentsFeature))); builder.AddCustomAttributes( ( <>), FeatureAttribute( (UpdatableGenericArgumentsFeature))); builder.AddCustomAttributes( ( <>), FeatureAttribute( (UpdatableGenericArgumentsFeature))); builder.AddCustomAttributes( ( <>), FeatureAttribute( (UpdatableGenericArgumentsFeature))); builder.AddCustomAttributes( ( <>), DefaultTypeArgumentAttribute( ( ))); builder.AddCustomAttributes( ( <>), DefaultTypeArgumentAttribute( ( ))); builder.AddCustomAttributes( ( <>), DefaultTypeArgumentAttribute( ( ))); builder.AddCustomAttributes( ( <>), DefaultTypeArgumentAttribute( ( ))); MetadataStore.AddAttributeTable(builder.CreateTable()); MorphHelper.AddPropertyValueMorphHelper( ( <>), .ArgumentMorphHelper); MorphHelper.AddPropertyValueMorphHelper( ( <>), .ArgumentMorphHelper); MorphHelper.AddPropertyValueMorphHelper( ( <>), .ArgumentMorphHelper); MorphHelper.AddPropertyValueMorphHelper( ( <>), .ActivityActionMorphHelper); MorphHelper.AddPropertyValueMorphHelper( ( <,>), .ActivityFuncMorphHelper); // There is no need to keep an reference to this delayed worker since the AppDomain event handler will do it. delayedWorker = (); delayedWorker. ("System.Workflow.Runtime", . ); delayedWorker. ("System.ServiceModel", ); delayedWorker. ("System.ServiceModel", ); delayedWorker. (); } (AttributeTableBuilder builder) { . (builder); builder.AddCustomAttributes( ( < >), EditorReuseAttribute( )); builder.AddCustomAttributes( ( < >), EditorReuseAttribute( )); builder.AddCustomAttributes( ( ), PropertyValueEditor.CreateEditorAttribute( ( ))); } (AttributeTableBuilder builder) { builder.AddCustomAttributes( ( ), SearchableStringConverterAttribute( ( ))); builder.AddCustomAttributes( ( ), SearchableStringConverterAttribute( ( ))); builder.AddCustomAttributes( ( ), SearchableStringConverterAttribute( ( ))); builder.AddCustomAttributes( ( ), SearchableStringConverterAttribute( ( ))); builder.AddCustomAttributes( ( ), SearchableStringConverterAttribute( ( ))); } } }

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I get error when am creating project or when am open the project

hello, UiPath

I get this error

21.4.2+Branch.master.Sha.3b603a5ec0f1b6af959e38d84177ff1d548b3ea2

The project ‘C:\Users\STSK PropTech\Documents\UiPath\AppDataEntryProject\project.json’ could not be opened: The type initializer for ‘System.Activities.Presentation.WorkflowDesigner’ threw an exception…

Cannot open item: UiPath.Studio.Contracts.RecoverableException: The project ‘C:\Users\STSK PropTech\Documents\UiPath\AppDataEntryProject\project.json’ could not be opened: The type initializer for ‘System.Activities.Presentation.WorkflowDesigner’ threw an exception… —> RemoteException wrapping System.TypeInitializationException: The type initializer for ‘System.Activities.Presentation.WorkflowDesigner’ threw an exception. —> RemoteException wrapping System.InvalidOperationException: Collection was modified; enumeration operation may not execute. at System.ThrowHelper.ThrowInvalidOperationException(ExceptionResource resource) at System.Collections.Generic.Dictionary 2.KeyCollection.Enumerator.MoveNext() at System.Activities.Presentation.Metadata.MetadataStore.MetadataStoreProvider.AddTable(AttributeTable table, Boolean isSystemAttributeTable) at System.Activities.Presentation.Metadata.MetadataStore.AddAttributeTableCore(AttributeTable table, Boolean isSystemAttributeTable) at System.Activities.Presentation.Internal.PropertyEditing.Metadata.PropertyInspectorMetadata.Initialize() at System.Activities.Presentation.WorkflowDesigner..cctor() --- End of inner exception stack trace --- at System.Runtime.CompilerServices.RuntimeHelpers._RunClassConstructor(RuntimeType type) at UiPath.Studio.Plugin.Workflow.Services.ProjectLoaderProjectEndpoint.<>c.<LoadFromContainerAsync>b__10_0() at UiPath.Studio.Plugin.Workflow.WorkflowHandling.MetadataStoreGlobalLock.ExecuteWithLock(Action code) at UiPath.Studio.Plugin.Workflow.Services.ProjectLoaderProjectEndpoint.<LoadFromContainerAsync>d__10.MoveNext() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at UiPath.CoreIpc.Server.<InvokeMethod>d__22.MoveNext() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at UiPath.CoreIpc.Server.<HandleRequest>d__21.MoveNext() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at UiPath.CoreIpc.Server.<>c__DisplayClass4_2.<<-ctor>b__6>d.MoveNext() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at UiPath.CoreIpc.IOHelpers.<WithResult>d__13.MoveNext() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at UiPath.CoreIpc.IOHelpers.<WithTimeout>d__19 1.MoveNext() — End of inner exception stack trace — at UiPath.Studio.Core.Services.PersistableServiceBase 3.OnOpenAsync(String path, IFactory 2 resolvedFactory, IOpenOptions options) at UiPath.Studio.Core.CommonServices.ProjectServiceBase.OnOpenAsync(String path, IFactory 2 resolvedFactory, IOpenOptions options) at UiPath.Studio.Core.CommonServices.ProjectServiceBase.OnOpenAsync(String path, IFactory 2 resolvedFactory, IOpenOptions options) at UiPath.Studio.Core.Services.PersistableServiceBase 3.OpenAsync(OpenInformation openInfo) at UiPath.Studio.Core.CommonServices.OpenCloseCommandsService.OpenProjectAsync(OpenInformation openInfo, IProject newProject) at UiPath.Studio.Core.CommonServices.OpenCloseCommandsService.OpenNewProjectAsync(IProject newProjectItem) at UiPath.Studio.Core.CommonServices.OpenCloseCommandsService.CreateNewProjectAsync(IProjectTemplate template) at UiPath.Studio.Shell.ViewModels.StartPageViewModel.<>c__DisplayClass51_0.<<OnNewProjectCommand>b__0>d.MoveNext() --- End of stack trace from previous location --- at UiPath.Studio.Shell.ViewModels.StartPageViewModel.ExecuteCommand(Func 1 commandExecute) at UiPath.Studio.Shell.ViewModels.StartPageViewModel.OnNewProjectCommand(String project) at UiPath.Studio.App.Desktop.MVVM.Commands.TaskCommand`3.Execute(TExecuteParameter parameter, Boolean ignoreCanExecuteCheck) at System.Threading.Tasks.Task.<>c.b__140_0(Object state) at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs) at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler), HResult -2146233088

Hi @copy_writes try to update to latest stable version of UiPath.

Hi, @copy_writes , Try go to Home → Setting → Reset Settings. After that restrat UiPath. You can also try restarting your machine if the previous step does not work.

thanks for the quick response I will check

Best, Robin

@copy_writes

We will investigate the issue further.

Thank you for providing the details. Our team was able to look into the issue and is working on a fix that will be released with the next version.

And I have a question We can use this in another system if we provide a URL to them?

thanks Chethan P

Topic		Replies	Views	Activity
Studio , , , , , , ,	2	1188	July 11, 2022
Studio , ,	1	1607	January 25, 2023
Studio	1	842	October 31, 2021
Studio , ,	1	1896	November 13, 2021
Studio	5	1556	October 22, 2020

Migrating Activities to .NET 6

This page offers an overview of how to migrate your custom .NET Framework activities to .NET 6 for use in projects with the Windows compatibility available starting with Studio 2021.10.6.

We will use the sample MathSquareOfSum .NET Framework activity documented on the Creating Activities With Code (Legacy) page as an example for a migration to .NET 6 that targets Windows while also maintaining compatibility with .NET Framework for Windows - Legacy projects.

Step 1: Migrate the project to the new SDK-style format and add the net6.0-windows target

A project that is using the .NET Framework project format must be migrated to the new SDK-style format. For more information, see the Microsoft documentation . Package references must be declared in the .csproj file as opposed to packages.config .

In Solution Explorer, right click the project and select Unload Project .
Copy references and clear everything from the .csproj file.
Manually update the .csproj file to the new format.
Add the target framework net6.0-windows .
Mark the original references as net461 only by adding a condition.
Add a new reference section with conditions for net6.0-windows . You must declare the following WWF dependencies for .NET: UiPath.Workflow.Runtime, UiPath.Workflow, System.Activities.Core.Presentation, System.Activities.Metadata. Make sure all your dependencies support .NET. You might need to find newer package versions or replacement packages.
In Solution Explorer, right click the project and select Reload Project .

The file should look as follows.

Step 2: Build the solution

Make sure you test the project for errors before attempting to build it.

Step 3: Create a NuGet package

Create a NuGet package using NuGet Package Explorer, as described in Creating Activities With Code (Legacy) .

Launch NuGet Package Explorer and click Create a new package (Ctrl + N) . A split-window is displayed which shows Package metadata and Package contents . We need to add all dependencies in the latter section.
Right-click inside the Package contents section. A context menu is displayed.
Click Add lib folder . Notice a new lib item is created in the Package contents section.
Add .NET Framework folder > v4.6.1
Add .NET folder > v6.0-windows
net461 - MathSquareOfSum.dll
net6.0-windows - MathSquareOfSum.dll
Rename the folder net6.0-windows to net6.0-windows7.0 .
With the file selected, access the Edit menu and select Edit Metadata . The left panel is now fitted with editable metadata fields.
Edit the metadata fields as needed.

Click the green check mark button in the top-left corner save all changes.
Select File > Save As to save the new file.

Was this page helpful?

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Attribute Table 类

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。

特性表是元数据特性的只读集合，其中的特性与特定的类型、成员和依赖项关联。

此表是使用 AttributeTableBuilder 创建的，并且它由 MetadataStore 使用。

AttributeTable 是使用 AttributeTableBuilder 创建的，并且它由 MetadataStore 使用。

返回在属性、成员或类型本身上具有特性重写的所有类型的枚举。

	确定此表是否包含给定类型的元数据。
	确定指定对象是否等于当前对象。 (继承自 )
	返回为指定类型提供的所有类级别特性的枚举。
	返回为具有指定类型的指定依赖项提供的所有特性的枚举。
	返回为具有指定类型的指定成员提供的所有特性的枚举。
	返回为具有指定类型的指定成员提供的所有特性的枚举。
	返回为具有指定类型的指定成员提供的所有特性的枚举。
	作为默认哈希函数。 (继承自 )
	获取当前实例的。 (继承自 )
	创建当前的浅表副本。 (继承自 )
	返回表示当前对象的字符串。 (继承自 )

IMAGES

PPT
PPT
Metadata System PowerPoint Presentation and Slides
PPT
PPT
PPT

VIDEO

File Metadata
Leveraging Automatically Applied Metadata in SharePoint
powerpoint presentation ((OPERATING SYSTEM))⏰|| VandanaBisht||
SA: Using Metadata with Microsoft Access and SQL Server, by Kim Young
Your Online Privacy? ISP Tracking? Online History?
METHODS OF PRESENTATION OF DATA

COMMENTS

System.Activities.Presentation.Metadata Namespace
The attribute table is a read-only collection of metadata attributes that are associated with specific types, members, and dependencies. Creates and populates an AttributeTable that is used by the MetadataStore to provide attribute lookup and registration. Provides the functionality to throw an exception from the ValidateTable () method if the ...
IRegisterMetadata Interface (System.Activities.Presentation.Metadata
Remarks. IRegisterMetadata types provide a way to encapsulate the association of design-time attributes to run-time types in a loosely coupled fashion. An application hosting the Windows Workflow Designer can use the IRegisterMetadata interface to register the attributes for the activity. For instance, Visual Studio 2010 searches for types that ...
IRegisterMetadata.Register Method (System.Activities.Presentation.Metadata)
Definition. System. Activities. Presentation. Metadata. Some information relates to prerelease product that may be substantially modified before it's released. Microsoft makes no warranties, express or implied, with respect to the information provided here. Adds additional metadata to the metadata store upon initialization of the designer.
System.Activities.Presentation not supported in .net 5
1. Recently i migrated my wpf application from .net framework 4.7.2 to .net 5 with the help of upgrade assistant tool, but after upgrading System.Activities.Presentation is not supported in .net 5. Please suggest how can i proceed further. c#. wpf. .net-core. .net-5. workflow-foundation-4. edited Jan 24, 2022 at 11:00.
Reference error trying to build sample custom activities library
Trying to figure out using custom external assemblies etc. One of the example files stipulates that the Visual Studio project have: using System.Activities.Presentation.Metadata; This is necessary to implement the following class: // Declare dummy register metadata class to force UiPath to load this assembly public class RegisterMetadata : IRegisterMetadata { public void Register() { } } Angry ...
referencesource/System.Activities.Presentation/System.Activities
Source from the Microsoft .NET Reference Source that represent a subset of the .NET Framework - microsoft/referencesource
DesignerMetadata.cs
RegisterMetadata(builder); // Registering inline for designers for InitializeCorrelation, Send, Receive, SendReply, ReceiveReply activities to avoid calling// their static constructors. This will avoid instantiating the ResourceDictionary for their PropertyValueEditors during designer load.builder.AddCustomAttributes(typeof(Send ...
dotnet-api-docs/xml/System.Activities.Presentation.Metadata ...
.NET API reference documentation (.NET 5+, .NET Core, .NET Framework) - dotnet/dotnet-api-docs
Creating custom activity for .net 6
I have created class library project for .net 6 and installed packages UiPath.Workflow and UiPath.Workflow.Runtime but i can not see System.Activities.Core.Presentation and System.Activities.Metadata packages. I didn't understand why. these packages should be downloaded automatically when you open/create new activity creator project.
Activities
About the System activity package. The System activity package contains all the basic tools used for creating automation projects. These tools enable the robots to: Manipulate data tables by adding or extracting information. Directly interact with directories and files on your machine, performing any action a human user would.
System.Activity for dotNET 6
As we are a few days away from releasing the Stable & Enterprise for 2022.4 Release that brings .NET 6.0 runtime support please find the list of dependencies if you want to create a .NET 6.0 activity package: UiPath.Workflow.Runtime <= 6..-20220401-03. UiPath.Workflow <= 6..-20220401-03.
SDK
Step 1: Migrate the project to the new SDK-style format and add the net6.0-windows target. A project that is using the .NET Framework project format must be migrated to the new SDK-style format. For more information, see the Microsoft documentation. Package references must be declared in the .csproj file as opposed to packages.config.
MetadataStore Class (System.Activities.Presentation.Metadata)
Examples. The following code example shows how to associate the ActivityDesigner1 custom activity designer with a custom activity. For more information about how to create custom activity designers, see How to: Create a Custom Activity Designer.. internal class Metadata : IRegisterMetadata { private AttributeTable attributes; // Called by the designer to register any design-time metadata.
SDK
Creating a new project in Visual Studio. In Visual Studio, select File > New > Project. Select the template UiPath Activities Template, and then click Next. Configure the details of the project and solution, and then click Create.
System.Activities.Presentation Namespace
Used to configure how a Windows Workflow Designer initializes type-resolver and type-browser dialogs to enable a user to select a type for arguments, variables, and generic type activities. Undo Engine. Provides undo and redo operation implementations for designers. Undo Unit. Represents a single unit of undoable work.
System.Activities 6.0.3 not found
include in my .net project the UiPath.Workflow.Runtime package (v6.0.3) and also the System.Activities dll and System.ComponentModel.Composition dll copied from the UiPath Studio folder. Same result as 2) same as above but replacing the System.Activities dll of the UiPath Studio by System.Activities 6.0.3 dll. Result: UiPath Studio is broken.
SDK
Click Create to go to the code designer and start writing the activity code. In the Solution Explorer panel, right-click the References branch and select Add Reference.... The Reference Manager window is displayed. Search for the System.Activities and System.ComponentModel.Composition references and add them.
UiPath Activity Creator for VS2022 Not Working?
Unable to find package System.Activities.Metadata. No packages exist with this id in source(s) Unable to find package System.Activities.Core.Presentation. No packages exist with this id in source(s) Any idea on how to resolve this?
Method Not Found: System.Activities.ViewModels.Interfaces
@FilipeChiou. Please try renaming the project.json and then reopen the project again. Or go to c:\users\<username>\.nuget\packages and delete the system packages folder …and reopen the project …that way they would be redownloded fresh. Cheers
System.Activities.Presentation.Metadata 命名空间
提供一项功能，用于向一个特定的 AttributeTable 中添加特定类型的特性。. 特性表是元数据特性的只读集合，其中的特性与特定的类型、成员和依赖项关联。. 创建并填充一个 AttributeTable，它由 MetadataStore 用来提供特性查找和注册功能。. 提供一项功能，用于在表中 ...
I get error when am creating project or when am open the project
—> RemoteException wrapping System.TypeInitializationException: The type initializer for 'System.Activities.Presentation.WorkflowDesigner' threw an exception. —> RemoteException wrapping System.InvalidOperationException: Collection was modified; enumeration operation may not execute.
Sdk
.NET の場合、UiPath.Workflow.Runtime、UiPath.Workflow、System.Activities.Core.Presentation、System.Activities.Metadata の依存関係を宣言する必要があります。すべての依存関係が .NET をサポートしていることを確認してください。新しいパッケージバージョンまたは置換 ...
AttributeTable 类 (System.Activities.Presentation.Metadata)
System.Activities.Presentation.Metadata 程序集: System.Activities.Presentation.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。

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