以编程方式访问Excel自定义文档属性

Question

我正在尝试将自定义属性添加到我以编程方式创建的工作簿中.我有一个方法来获取和设置属性,但问题是工作簿为CustomDocumentProperties属性返回null.我无法弄清楚如何初始化此属性,以便我可以从工作簿中添加和检索属性.Microsoft.Office.Core.DocumentProperties是一个接口,所以我不能去做以下事情

if(workbook.CustomDocumentProperties == null)
    workbook.CustomDocumentProperties = new DocumentProperties;

这是我必须获得的代码并设置属性:

     private object GetDocumentProperty(string propertyName, MsoDocProperties type)
    {
        object returnVal = null;

        Microsoft.Office.Core.DocumentProperties properties;
        properties = (Microsoft.Office.Core.DocumentProperties)workBk.CustomDocumentProperties;

        foreach (Microsoft.Office.Core.DocumentProperty property in properties)
        {
            if (property.Name == propertyName && property.Type == type)
            {
                returnVal = property.Value;
            }
            DisposeComObject(property);
        }

        DisposeComObject(properties);

        return returnVal;
    }

    protected void SetDocumentProperty(string propertyName, string propertyValue)
    {
        DocumentProperties properties;
        properties = workBk.CustomDocumentProperties as DocumentProperties;

        bool propertyExists = false;
        foreach (DocumentProperty prop in properties)
        {
            if (prop.Name == propertyName)
            {
                prop.Value = propertyValue;
                propertyExists = true;
            }
            DisposeComObject(prop);

            if(propertyExists) break;
        }

        if (!propertyExists)
        {
            properties.Add(propertyName, false, MsoDocProperties.msoPropertyTypeString, propertyValue, Type.Missing);
        }

        DisposeComObject(propertyExists);

    }

line properties = workBk.CustomDocumentProperties as DocumentProperties; 始终将属性设置为null.

这是使用Microsoft.Office.Core v12.0.0.0和Microsoft.Office.Interop.Excell v12.0.0.0(Office 2007)

Answer 1

如果您的目标是.NET 4.0,则可以使用dynamic关键字进行后期绑定

 Document doc = GetActiveDocument();
 if ( doc != null )
 {
     dynamic properties = doc.CustomDocumentProperties;
     foreach (dynamic p in properties)
     {
         Console.WriteLine( p.Name + " " + p.Value);
     }
 }

Answer 2

我查看了自己的代码,可以看到我使用后期绑定访问属性.我不记得为什么,但我会发布一些代码以防万一.

object properties = workBk.GetType().InvokeMember("CustomDocumentProperties", BindingFlags.Default | BindingFlags.GetProperty, null, workBk, null);

object property = properties.GetType().InvokeMember("Item", BindingFlags.Default | BindingFlags.GetProperty, null, properties, new object[] { propertyIndex });

object propertyValue = property.GetType().InvokeMember("Value", BindingFlags.Default | BindingFlags.GetProperty, null, propertyWrapper.Object, null);

编辑:啊,现在我记得为什么.:-)

编辑2:Jimbojones的回答 - 使用动态关键字 - 是一个更好的解决方案(如果您重视使用的易用性而非使用的性能开销dynamic).

Answer 3

我在这里找到了解决方案.

这是我最终得到的代码:

    public void SetDocumentProperty(string propertyName, string propertyValue)
    {
        object oDocCustomProps = workBk.CustomDocumentProperties;
        Type typeDocCustomProps = oDocCustomProps.GetType();

        object[] oArgs = {propertyName,false,
                 MsoDocProperties.msoPropertyTypeString,
                 propertyValue};

        typeDocCustomProps.InvokeMember("Add", BindingFlags.Default |
                                   BindingFlags.InvokeMethod, null,
                                   oDocCustomProps, oArgs);

    }

    private object GetDocumentProperty(string propertyName, MsoDocProperties type)
    {
        object returnVal = null;

        object oDocCustomProps = workBk.CustomDocumentProperties;
        Type typeDocCustomProps = oDocCustomProps.GetType();


        object returned = typeDocCustomProps.InvokeMember("Item", 
                                    BindingFlags.Default |
                                   BindingFlags.GetProperty, null,
                                   oDocCustomProps, new object[] { propertyName });

        Type typeDocAuthorProp = returned.GetType();
        returnVal = typeDocAuthorProp.InvokeMember("Value",
                                   BindingFlags.Default |
                                   BindingFlags.GetProperty,
                                   null, returned,
                                   new object[] { }).ToString();

        return returnVal;
    }

如果在检索时属性不存在,则需要进行一些异常处理