Solving the “User cannot be found” error with SPFile.Author

pclzr

于 2012-10-18 15:52:16 发布

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分类专栏： SharePoint C# 文章标签： user sharepoint login properties list asp.net

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本文介绍了一个在自定义ASP.NET页面中显示SharePoint 2007列表项时遇到的问题，当尝试查看某个特定列表项的附件详情时，用户会收到“找不到用户”的错误。该文详细解释了错误的原因——即当附件的作者从Active Directory中移除后，SharePoint无法解析此用户。文章还提供了一个解决方案，通过直接从SPFile属性获取登录名来显示作者信息。

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I ran into a bug today that was a bit unusual. We have a custom ASP.NET page that shows information from a custom list in SharePoint 2007. That page shows details, including the Author, for attachments. On one particular list item, users started getting a “User cannot be found” error whey they tried to view it with our custom page. The stack trace showed that it was getting the error in Microsoft.SharePoint.SPFile.get_Author().

It turns out that SPFile stores the user as a login name and tries to resolve the name using SPWeb.SiteUsers, which throws an error if the login name is not found. The issue was, in this case, the attachment author had been removed from Active Directory and was no longer in SharePoint’s user list, hence the error.

The fix is to go directly to the SPFile properties and get the login name. Since we can no longer resolve the login name to a user display name, we just display the login name.

string GetAuthorName(SPFile file)
{
    SPUser author = null;
    try { author = file.Author; } catch { }
    return (author == null) ? (string)file.Properties["vti_author"] : author.Name;
}