SharePoint CAML 查询 - 如何以编程方式读取 MetaInfo 字段值？

Question

我正在使用 C# 和 SharePoint 客户端对象模型 跨文件夹递归查询以获取返回的集合中的文件属性。

通过像这样指定字段名称，我可以成功地从 ListItemCollection 中读取值：

listItem["Title"]

但是有没有办法读取

中的各个值

listItem["MetaInfo"]

这似乎有多个自定义元数据值，我想是由 Microsoft Office 应用程序设置的？？？我可以将它转换为一个类型来获取单独的值吗？

我不想解析字符串....

MetaInfo 字段的调试器中的数据如下所示：

   display_urn\:schemas-microsoft-com\:office\:office#Editor:SW|System Account
   \nvti_parserversion:SR|14.0.0.7149
   \nvti_folderitemcount:IR|0
   ContentTypeId:SW|0x0101008B5F2095338FE647A7F89B5275681D66
   vti_title:SW|Mr Foo Howe 26-03-2014
   vti_author:SW|MYDOMAIN\\jblogs
   Document Type:SW|Contract Note
   vti_modifiedby:SR|SHAREPOINT\\system
   vti_foldersubfolderitemcount:IR|0
   display_urn\:schemas-microsoft-com\:office\:office#Author:SW|Blogs, Jo

感谢您的帮助，请原谅我的无知 - 这是我第一次处理 SharePoint :)

Answer 1

SharePoint CSOM API 不包含 builtin 方法来解析 MetaInfo 字段值，returns 关联的元数据信息的字符串表示使用指定的客户端对象。

您可以考虑使用以下方法来解析 MetaInfo 字段值：

/// <summary>
/// Parse MetaInfo field value
/// </summary>
/// <param name="value"></param>
/// <returns></returns>
private static Dictionary<string, string> ParseMetaInfo(string value)
{
    return value.Split(new[] {Environment.NewLine}, StringSplitOptions.RemoveEmptyEntries)
            .Select(x => x.Split(new[] {":"}, StringSplitOptions.RemoveEmptyEntries))
            .ToDictionary(x => x[0], x => x[1]);
}

用法

var list = ctx.Web.Lists.GetByTitle(targetListTitle);
var items = list.GetItems(CamlQuery.CreateAllItemsQuery());
ctx.Load(items, icol => icol.Include( i => i["MetaInfo"]));
//ctx.Load(items);
ctx.ExecuteQuery();

foreach (var item in items)
{
    var metaInfo = (string) item["MetaInfo"];
    var metaInfoValue = ParseMetaInfo(metaInfo);
    //..

}

Answer 2

我已将 Vadim 的解决方案标记为答案，但我认为我会 post 我的解决方案，这是我在看到他的回复之前所做的。

下面的实现使用扩展方法和正则表达式匹配来提取值 - 如果您已经知道要阅读的字段，即它们是预定义的，那么这很有用 - 如果您不知道要处理什么with 并且它们是动态的，那么上面的答案可能对您更有用。

扩展方法和 class 在您可能需要检索的 MetaInfo 字段中定义元信息属性：

public static class Extensions
{

    public static string[] DocMetaInfoFields =
    {
        MetaInfoFields.Title, MetaInfoFields.Author,
        MetaInfoFields.DocumentType, MetaInfoFields.ModifiedBy
    };

    public static string GetDocumentType(this object metaInfo)
    {
        var match = GetRegexMatch(metaInfo as string, MetaInfoFields.DocumentType);
        return (match.Groups.Count > 1)
            ? match.Groups[1].Value
            : string.Empty;
    }

    public static Dictionary<string, string> GetDocMetaProperties(this object metaInfo)
    {
        var properties = new Dictionary<string, string>();
        foreach (var field in DocMetaInfoFields)
        {
            var match = GetRegexMatch(metaInfo as string, field);
            properties.Add(field,
                (match.Groups.Count > 1)
                    ? match.Groups[1].Value
                    : string.Empty);
        }
        return properties;
    }

    public static StringBuilder FormatCamlValues(this StringBuilder sb, string valueTag, string listName,
        IEnumerable<string> clientReferences)
    {
        foreach (var clientRef in clientReferences)
        {
            sb.AppendFormat(valueTag, listName, clientRef);
        }
        return sb;
    }

    public static List<ClientDocumentListItem> ToClientDocumentList(this ListItemCollection files)
    {
        return files.ToList().ConvertAll(ListItemToClientDocItem);
    }

    private static Match GetRegexMatch(string searchString, string fieldName)
    {
        string regexCapture = string.Format(@"^{0}:\w{{2}}\|([^.(\r|\n)]*)[\r\n|\n\r]+\w", fieldName);
        return Regex.Match(searchString, regexCapture, RegexOptions.Multiline);
    }
}

/// <summary>
/// Defines the field names inside the MetaInfo composite field returned while using the SharePoint client object CamlQuery() method
/// </summary>
public static class MetaInfoFields
{
    public static string MetaInfoFieldName = "MetaInfo";
    public static string Title = "vti_title";
    public static string Author = "vti_author";
    public static string DocumentType = "Document Type";
    public static string ModifiedBy = "vti_modifiedby";
}

用法

var list = ctx.Web.Lists.GetByTitle(targetListTitle);
var items = list.GetItems(CamlQuery.CreateAllItemsQuery());
ctx.Load(items, icol => icol.Include( i => i[MetaInfoFields.MetaInfoFieldName]));
//ctx.Load(items);
ctx.ExecuteQuery();

var docProperties = GetDocMetaProperties(listItem[MetaInfoFields.MetaInfoFieldName]);

var title = docProperties[MetaInfoFields.Title];    
var createdBy = docProperties[MetaInfoFields.Author];    
var modifiedBy = docProperties[MetaInfoFields.ModifiedBy];    
var type = docProperties[MetaInfoFields.DocumentType];

SharePoint CAML 查询 - 如何以编程方式读取 MetaInfo 字段值？

SharePoint CAML Query - How to read MetaInfo field values programmatically?

c#

sharepoint

sharepoint-2010

caml