如何克服自定义文档属性大小限制

Question

我需要将长文档（特定于文档）字符串保存到Excel文档。 由于Office.Core.CustomDocumentProperty.value的长度限制只有255个字符，因此请告知如何克服此限制，或建议其他方式将数据存储在Excel文档中。

（根据我的记忆，一个单元格公式只能存储255字符，所以这不是一个可行的解决方案。）

Answer 1

只是分裂你的价值为多个属性。像这样的东西会奏效。

private static void WriteCustomDocumentProperty(Workbook workbook, string name, string value) 
{ 
    dynamic customDocumentProperties = workbook.CustomDocumentProperties; 
    var numParts = value.Length/255 + (value.Length%255 != 0 ? 1 : 0); 
    for (var i = 0; i < numParts; ++i) 
    { 
     var part = value.Substring(i*255, Math.Min(255, value.Length - i*255)); 
     customDocumentProperties.Add(name + "." + i, false, MsoDocProperties.msoPropertyTypeString, part); 
    } 
    customDocumentProperties.Add(name + ".Count", false, MsoDocProperties.msoPropertyTypeNumber, numParts); 
} 

private static string ReadCustomDocumentProperty(Workbook workbook, string name) 
{ 
    dynamic customDocumentProperties = workbook.CustomDocumentProperties; 
    var numParts = Convert.ToInt32(customDocumentProperties[name + ".Count"].Value); 
    var value = new StringBuilder(); 
    for (var i = 0; i < numParts; ++i) 
     value.Append(customDocumentProperties[name + "." + i].Value); 
    return value.ToString(); 
} 

根据字符串的大小，这可能会很慢。更好的选择可能是使用自定义XML部件。

private static void WriteCustomDocumentProperty(Workbook workbook, string name, string value) 
{ 
    var ns = "urn:custom-storage:" + name; 
    var document = new XDocument(new XElement(XName.Get("custom-storage", ns), value)); 
    var xmlValue = document.ToString(); 
    workbook.CustomXMLParts.Add(xmlValue); 
} 

private static string ReadCustomDocumentProperty(Workbook workbook, string name) 
{ 
    var ns = "urn:custom-storage:" + name; 
    var parts = workbook.CustomXMLParts.SelectByNamespace(ns); 
    switch (parts.Count) 
    { 
     case 0: 
      return null; 
     case 1: 
      return XDocument.Parse(parts[1].XML).Root.Value; 
     default: 
      throw new ApplicationException("Duplicate part in workbook."); 
    } 
}