WF4.0中如何實現XAML工作流的動態加載
我接下來還是用一個例子講解一下如何在WF 4中動態加載xaml工作流的做法吧。
1. 創建自定義的Activity
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Activities;
namespace WorkflowConsoleApplication1
{
public sealed class MyActivity : CodeActivity
{
// Define an activity input argument of type string
public InArgument<string> Text { get; set; }
// If your activity returns a value, derive from CodeActivity<TResult>
// and return the value from the Execute method.
protected override void Execute(CodeActivityContext context)
{
// Obtain the runtime value of the Text input argument
string text = context.GetValue(this.Text);
Console.WriteLine(text);
}
}
}
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Activities;
namespace WorkflowConsoleApplication1
{
public sealed class MyActivity : CodeActivity
{
// Define an activity input argument of type string
public InArgument<string> Text { get; set; }
// If your activity returns a value, derive from CodeActivity<TResult>
// and return the value from the Execute method.
protected override void Execute(CodeActivityContext context)
{
// Obtain the runtime value of the Text input argument
string text = context.GetValue(this.Text);
Console.WriteLine(text);
}
}
}
2.將這個自定義的Activity添加到流程中
設置它的Text屬性：
3.將工作流的屬性進行一些修改
注意，將BuildAction設置為Content，同時Copy to Output Directory 設置為Copy always，并且將Custom Tool設置為空白，完成操作之后，得到的xaml文件如下：
<Activity mc:Ignorable="sap" x:Class="WorkflowConsoleApplication1.Workflow1" sap:VirtualizedContainerService.HintSize="240,240" mva:VisualBasic.Settings="Assembly references and imported namespaces for internal implementation" xmlns="http://schemas.microsoft.com/netfx/2009/xaml/activities" xmlns:local="clr-namespace:WorkflowConsoleApplication1" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:mv="clr-namespace:Microsoft.VisualBasic;assembly=System" xmlns:mva="clr-namespace:Microsoft.VisualBasic.Activities;assembly=System.Activities" xmlns:s="clr-namespace:System;assembly=mscorlib" xmlns:s1="clr-namespace:System;assembly=System" xmlns:s2="clr-namespace:System;assembly=System.Xml" xmlns:s3="clr-namespace:System;assembly=System.Core" xmlns:sad="clr-namespace:System.Activities.Debugger;assembly=System.Activities" xmlns:sap="http://schemas.microsoft.com/netfx/2009/xaml/activities/presentation" xmlns:scg="clr-namespace:System.Collections.Generic;assembly=System" xmlns:scg1="clr-namespace:System.Collections.Generic;assembly=System.ServiceModel" xmlns:scg2="clr-namespace:System.Collections.Generic;assembly=System.Core" xmlns:scg3="clr-namespace:System.Collections.Generic;assembly=mscorlib" xmlns:sd="clr-namespace:System.Data;assembly=System.Data" xmlns:sl="clr-namespace:System.Linq;assembly=System.Core" xmlns:st="clr-namespace:System.Text;assembly=mscorlib" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
<local:MyActivity sad:XamlDebuggerXmlReader.FileName="D:\temp\WorkflowConsoleApplication1\WorkflowConsoleApplication1\Workflow1.xaml" sap:VirtualizedContainerService.HintSize="200,200" Text="Hello,World" />
</Activity>
<local:MyActivity sad:XamlDebuggerXmlReader.FileName="D:\temp\WorkflowConsoleApplication1\WorkflowConsoleApplication1\Workflow1.xaml" sap:VirtualizedContainerService.HintSize="200,200" Text="Hello,World" />
</Activity>
4. 通過下面的代碼創建并且運行流程
using System;
using System.Linq;
using System.Activities;
using System.Activities.Statements;
using System.Activities.XamlIntegration;
namespace WorkflowConsoleApplication1
{
class Program
{
static void Main(string[] args)
{
WorkflowInvoker.Invoke(ActivityXamlServices.Load("workflow1.xaml"));
}
}
}
using System.Linq;
using System.Activities;
using System.Activities.Statements;
using System.Activities.XamlIntegration;
namespace WorkflowConsoleApplication1
{
class Program
{
static void Main(string[] args)
{
WorkflowInvoker.Invoke(ActivityXamlServices.Load("workflow1.xaml"));
}
}
}
運行上述代碼，我們會遇到一個錯誤。
這是為什么呢？MyActivity找不到？我們應該手工將xaml文件成下面這樣。請注意粗體的部分，我添加了assembly的設置：
<Activity mc:Ignorable="sap" x:Class="WorkflowConsoleApplication1.Workflow1" sap:VirtualizedContainerService.HintSize="240,240" mva:VisualBasic.Settings="Assembly references and imported namespaces for internal implementation" xmlns="http://schemas.microsoft.com/netfx/2009/xaml/activities" xmlns:local="clr-namespace:WorkflowConsoleApplication1;assembly=WorkflowConsoleApplication1" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:mv="clr-namespace:Microsoft.VisualBasic;assembly=System" xmlns:mva="clr-namespace:Microsoft.VisualBasic.Activities;assembly=System.Activities" xmlns:s="clr-namespace:System;assembly=mscorlib" xmlns:s1="clr-namespace:System;assembly=System" xmlns:s2="clr-namespace:System;assembly=System.Xml" xmlns:s3="clr-namespace:System;assembly=System.Core" xmlns:sad="clr-namespace:System.Activities.Debugger;assembly=System.Activities" xmlns:sap="http://schemas.microsoft.com/netfx/2009/xaml/activities/presentation" xmlns:scg="clr-namespace:System.Collections.Generic;assembly=System" xmlns:scg1="clr-namespace:System.Collections.Generic;assembly=System.ServiceModel" xmlns:scg2="clr-namespace:System.Collections.Generic;assembly=System.Core" xmlns:scg3="clr-namespace:System.Collections.Generic;assembly=mscorlib" xmlns:sd="clr-namespace:System.Data;assembly=System.Data" xmlns:sl="clr-namespace:System.Linq;assembly=System.Core" xmlns:st="clr-namespace:System.Text;assembly=mscorlib" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
<local:MyActivity sad:XamlDebuggerXmlReader.FileName="D:\temp\WorkflowConsoleApplication1\WorkflowConsoleApplication1\Workflow1.xaml" sap:VirtualizedContainerService.HintSize="200,200" Text="Hello,World" />
</Activity>
<local:MyActivity sad:XamlDebuggerXmlReader.FileName="D:\temp\WorkflowConsoleApplication1\WorkflowConsoleApplication1\Workflow1.xaml" sap:VirtualizedContainerService.HintSize="200,200" Text="Hello,World" />
</Activity>
我個人認為這應該算是一個bug。但目前的情況就是這樣，如果你的自定義Activity是在當前應用程序里面，則也是需要設置Assembly的信息的。當然，如果自定義Activity是單獨的Assembly,則應該默認就會寫上Assembly信息，那種情況反而是沒有問題的。
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