64位的机器上VS2008不能使用SharePoint的workflow template
下面的文字摘自VS2008的readme, 官方文档
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Using Office SharePoint workflow templates on a 64-bit operating system is unsupported and causes an exception.
Visual Studio 2008 throws two exceptions if you try to create a SharePoint workflow project (SharePoint 2007 Sequential Workflow or SharePoint 2007 State Machine Workflow) on a 64-bit computer. The first exception message is: "Object reference not set to an instance of an object". The second message is: "SharePoint site location entered is not valid. The SharePoint site at http://<serverpath> could not be found. Verify that you have typed the URL correctly".
解决方案
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Do not use the Visual Studio SharePoint workflow templates on a computer that is running a 64-bit operating system.
WorkAround
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这里包含一个workaround
http://pointstoshare.spaces.live.com/blog/cns!AEC42F315B4528B0!3018.entry?wa=wsignin1.0&sa=810023154
步骤如下:
1. 安装wspbuilder
2. In Visual Studio 2008 Click, File > New > Project
3. Select WSPBuilder and then Select then WSPBuilder Project with Workflow
4. Click OK
5. In the Solution Explorer window Right Click on the Projet Name (for example, WSPBuilderProject1)
> Add > Sequential Workflow
6. In the add New Item Window that just open, select Workflow categorie and the Sequential Workflow
7. And then , click on the Add button.
这里包含另一个workaround, 不过与上一个差不多.
http://blah.winsmarts.com/2008-7-Authoring_SharePoint_2007_Workflows_using_VS2008.aspx
Visual Studio 2008 Readme
http://download.microsoft.com/download/9/a/e/9ae0f6cc-7032-408e-9ca7-989f9e4af4ec/VS2008Readme.htm#Visual Studio Tools for Office
VS2008 SharePoint Workflows do not work on 64-bit machines
