类名

System.Activities.Statements.WriteLine

文件

System.Activities.dll

结构说明

继承 CodeActivity

是一个 sealed类

定义了[InArgument<string> Text属性] 与[InArgument<TextWriter> TextWriter属性]

override 了 [CacheMetadata方法] 与 [Execute方法]

功能说明

WriteLine类调用[TextWriter 属性]所指定的[System.IO.TextWriter 对像]输出[Text 属性] 的值

如果没指定[TextWriter 属性],默认为控制台输出[Text 属性] 的值

流程

xaml

<Activity mc:Ignorable="sap"

x:Class="WriteLineActivitySample.Workflow1"

mva:VisualBasic.Settings="Assembly references and imported namespaces serialized as XML namespaces"

xmlns="http://schemas.microsoft.com/netfx/2009/xaml/activities"

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, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"

xmlns:s1="clr-namespace:System;assembly=mscorlib"

xmlns:s2="clr-namespace:System;assembly=System"

xmlns:s3="clr-namespace:System;assembly=System.Xml"

xmlns:s4="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:sd1="clr-namespace:System.Data;assembly=System.Data.DataSetExtensions"

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"

>

<WriteLine

DisplayName="WriteLine的Text属性演示"

sad:XamlDebuggerXmlReader.FileName="d:\users\wxd\documents\visual studio 2010\Projects\WriteLineActivitySample\WriteLineActivitySample\Workflow1.xaml"

sap:VirtualizedContainerService.HintSize="213,200"

Text="[String.Format(&quot;{0}:{1}&quot;, &quot;wxwinter&quot;, System.DateTime.Now.ToString())]"

/>

</Activity>

运行工作流

class Program

{

static void Main(string[] args)

{

//WriteLine的Text属性演示

WorkflowInvoker.Invoke(new Workflow1());

//控制台停屏看效果

System.Console.Read();

}

}

运行结果

自定义

TextWriter

public class myTextWriter : System.IO.TextWriter

{

public override Encoding Encoding

{

get { return Encoding.UTF8; }

}

public override void WriteLine(string value)

{

System.Console.WriteLine("wxwinter:" + value);

}

}

流程

xaml

<Activity ...>

<WriteLine DisplayName="WriteLine的TextWriter属性演示"

Text="wxd"

TextWriter="[New WriteLineActivitySample.myTextWriter()]"

/>

</Activity>

运行工作流

class Program

{

static void Main(string[] args)

{

//WriteLine的TextWriter属性演示

WorkflowInvoker.Invoke(new Workflow2());

//控制台停屏看效果

System.Console.Read();

}

}

运行结果

class Program

{

static void Main(string[] args)

{

WriteLine wxwinterActivity = new WriteLine();

InArgument<string> inArgument = new InArgument<string>(getValue("wxd"));

wxwinterActivity.Text = inArgument;

WorkflowInvoker.Invoke(wxwinterActivity);

System.Console.Read();

}

static string getValue(string p)

{

return "wxwinter:" + p;

}

}