工作流中获取上下文方法示例

以前做练习的时候整理的，发上来供需要的朋友参考。

首先打开visio Studio 2005新建一项目，如下：

（解决方案我后来改为了MyTest.HandleContextObj，

程序集Accembly也是MyTest.HandleContextObj），而不是和类同名，原因是保存工作流时找不到类，不知何故

修改workflow1.cs为GetContextObjInfo.cs

从工具箱里面拖一个code控件过来

给codeActivity的ExecuteCode属性添加一个方法GetContextObjExe

加入我们需要把上下文的一些信息写到一个文件里面去，现在先添加写文件的代码：

GetContextObjInfo.cs完成代码如下：

using System;

using System.ComponentModel;

using System.ComponentModel.Design;

using System.Collections;

using System.Drawing;

using System.Workflow.ComponentModel.Compiler;

using System.Workflow.ComponentModel.Serialization;

using System.Workflow.ComponentModel;

using System.Workflow.ComponentModel.Design;

using System.Workflow.Runtime;

using System.Workflow.Activities;

using System.Workflow.Activities.Rules;

using System.IO;

namespace MyTest.HandleContextObj

{

public partial class GetContextObjInfo: SequenceActivity

{

public GetContextObjInfo()

{

InitializeComponent();

}

private void GetContextObjExe(object sender, EventArgs e)

{

//Write info to a file

string path = @"c:\contextObjInfo.txt";

string text = DateTime.Now.ToString();

StreamWriter writer = new StreamWriter(path);

writer.Write(text);

writer.Close();

}

添加引用

添加三个变量，这三个变量的名称是固定的。

名称	类型
__Context	WorkflowContext
__ListId	string
__ListItem	int

修改MyProperty为：__Context string为：WorkflowContext

其他两个属性类似

在private void GetContextObjExe(object sender, EventArgs e)中添加如下内容：

SPWeb contextWeb = __Context.Web;

SPList contextList = contextWeb.Lists[new Guid(__ListId)];

SPListItem contextItem = contextList.GetItemById(__ListItem);

SPFile contextFile = contextItem.File;

并修改string text = DateTime.Now.ToString()为

string text = DateTime.Now.ToString() + " DocName: " + "docName:" + contextFile.Name + " creator: " + contextFile.Author;已反映我们获取的上下文信息到文件中。

GetContextObjInfo.cs完成代码如下：

using System;

using System.ComponentModel;

using System.ComponentModel.Design;

using System.Collections;

using System.Drawing;

using System.Workflow.ComponentModel.Compiler;

using System.Workflow.ComponentModel.Serialization;

using System.Workflow.ComponentModel;

using System.Workflow.ComponentModel.Design;

using System.Workflow.Runtime;

using System.Workflow.Activities;

using System.Workflow.Activities.Rules;

using System.IO;

using Microsoft.SharePoint.WorkflowActions;

using Microsoft.SharePoint;

namespace MyTest.HandleContextObj

{

public partial class GetContextObjInfo: SequenceActivity

{

public GetContextObjInfo()

{

InitializeComponent();

}

public static DependencyProperty __ContextProperty = System.Workflow.ComponentModel.DependencyProperty.Register("__Context", typeof(WorkflowContext), typeof(GetContextObjInfo));

[Description("This is the description which appears in the Property Browser")]

[Category("This is the category which will be displayed in the Property Browser")]

[Browsable(true)]

[DesignerSerializationVisibility(DesignerSerializationVisibility.Visible)]

public WorkflowContext __Context

{

get

{

return ((WorkflowContext)(base.GetValue(GetContextObjInfo.__ContextProperty)));

}

set

{

base.SetValue(GetContextObjInfo.__ContextProperty, value);

}

public static DependencyProperty __ListIdProperty = System.Workflow.ComponentModel.DependencyProperty.Register("__ListId", typeof(string), typeof(GetContextObjInfo));

[Description("This is the description which appears in the Property Browser")]

[Category("This is the category which will be displayed in the Property Browser")]

[Browsable(true)]

[DesignerSerializationVisibility(DesignerSerializationVisibility.Visible)]

public string __ListId

{

get

{

return ((string)(base.GetValue(GetContextObjInfo.__ListIdProperty)));

}

set

{

base.SetValue(GetContextObjInfo.__ListIdProperty, value);

}

public static DependencyProperty __ListItemProperty = System.Workflow.ComponentModel.DependencyProperty.Register("__ListItem", typeof(int), typeof(GetContextObjInfo));

[Description("This is the description which appears in the Property Browser")]

[Category("This is the category which will be displayed in the Property Browser")]

[Browsable(true)]

[DesignerSerializationVisibility(DesignerSerializationVisibility.Visible)]

public int __ListItem

{

get

{

return ((int)(base.GetValue(GetContextObjInfo.__ListItemProperty)));

}

set

{

base.SetValue(GetContextObjInfo.__ListItemProperty, value);

}

private void GetContextObjExe(object sender, EventArgs e)

{

SPWeb contextWeb = __Context.Web;

SPList contextList = contextWeb.Lists[new Guid(__ListId)];

SPListItem contextItem = contextList.GetItemById(__ListItem);

SPFile contextFile = contextItem.File;

//Write info to a file

string path = @"c:\contextObjInfo.txt";

string text = DateTime.Now.ToString() + " DocName: " + "docName:" + contextFile.Name + " creator: " + contextFile.Author;

StreamWriter writer = new StreamWriter(path);

writer.Write(text);

writer.Close();

}

添加强签名

“生成”菜单里面选择“生成GetContextObjInfo”，如果出现问题一般是没有添加引用，添加即可

用reflactor察看公匙，并记下

到目录

C:\Program Files\Common Files\Microsoft Shared\web server extensions\12\TEMPLATE\2052\Workflow

下面，添加Action文件

GetContextObjInfo.ACTIONS内容如下：（注意公匙要和Dll一致，蓝色部分很重要）

<?xml version="1.0" encoding="utf-8"?>

<Action Name="GetContextObjectInfomation"

ClassName=" MyTest.HandleContextObj.GetContextObjInfo"

Assembly="MyTest.HandleContextObj, Version=1.0.0.0, Culture=neutral, PublicKeyToken=2305ddc6d88a7e80"

AppliesTo="all"

Category="ContextRelated">

</RuleDesigner>

</Parameters>

</Action>

</Actions>

</WorkflowInfo>

拷贝GetContextObjInfo.dll到目录：C:\Inetpub\wwwroot\wss\VirtualDirectories\8000\_app_bin

不要忘了修改web.config文件，添加一个新的authorizedType，否则在创建工作流Activity的时候，虽然能找到我们开发的类，但是取加不上去，也不报错。

<System.Workflow.ComponentModel.WorkflowCompiler>

……

<authorizedType Assembly="MyTest.HandleContextObj, Version=1.0.0.0, Culture=neutral, PublicKeyToken=2305ddc6d88a7e80" Namespace="MyTest.HandleContextObj " TypeName="*" Authorized="True" />

….

</authorizedTypes>

</System.Workflow.ComponentModel.WorkflowCompiler>

重启IIS

C:\Documents and Settings\Administrator>iisreset

正在尝试停止...

Internet 服务已成功停止

正在尝试启动...

Internet 服务已成功重新启动

打开Sharepoint Designer，如图可以在工具栏上直接进入该站点：