如何将System.Comobject类型转换为Microsoft.Office.Interop.Outlook._MailItem [英] How to cast System.Comobject type to Microsoft.Office.Interop.Outlook._MailItem

问题描述

Hi,

Outlook._NameSpace oNs = null;
Outlook.MAPIFolder oSents = null;
Outlook.Items oItems = null;
Outlook._MailItem oMICopy;

ns = olApp.GetNamespace("MAPI");
                        oSents = oNs .GetDefaultFolder(Outlook.OlDefaultFolders.olFolderSentMail);
                        oItems = oSents.Items;

var copy=oItems.Cast<Outlook._MailItem>();
                           oMICopy= copy.Where(x=>x.Recipients[0].Address.ToLower().ToString().Contains("Alex")).Select(y=>y).FirstOrDefault();

抛出异常无法将'System .__ ComObject'类型的COM对象强制转换为接口类型'Microsoft.Office.Interop .Outlook._MailItem'。此操作失败，因为IID为{00063034-0000-0000-C000-000000000046}的接口的COM组件上的QueryInterface调用由于以下错误而失败：不支持此类接口（HRESULT异常） ：0x80004002（E_NOINTERFACE））。



如何获取Outlook._MailItem oMICopy。



请帮忙！



谢谢，

Prasanna

its throwing exception "Unable to cast COM object of type 'System.__ComObject' to interface type 'Microsoft.Office.Interop.Outlook._MailItem'. This operation failed because the QueryInterface call on the COM component for the interface with IID '{00063034-0000-0000-C000-000000000046}' failed due to the following error: No such interface supported (Exception from HRESULT: 0x80004002 (E_NOINTERFACE))."

How to Get Outlook._MailItem oMICopy.

Please help!

Thanks,
Prasanna

推荐答案

Outlook.Item s oItem s = null; - 你看到单词末尾的复数吗？它不是单个项目，而是某种项目 s 的集合。

因此， var copy = oItems.Cast< outlook._mailitem> ;（）;< /outlook._mailitem> 没有意义。

我不知道 Outlook.Items 支持Linq所需的接口，可能需要通过集合明确循环。

Outlook.Items oItems = null; - Do you see the plural-s at the end of the words? It is not a single item, but some kind of a collection of items.
Consequently, var copy=oItems.Cast<outlook._mailitem>();</outlook._mailitem> does not make sense.
I do not know if Outlook.Items supports the interfaces required by Linq, it could be necessary to explicitely loop thru the collection.

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