C# InvalidCastException-无法强制转换类型为';Microsoft.Office.Interop.Outlook.ApplicationClass';
我编写了此代码,以使用outlook从.net应用程序发送附加文件,代码如下:C# InvalidCastException-无法强制转换类型为';Microsoft.Office.Interop.Outlook.ApplicationClass';,c#,.net,excel,outlook,C#,.net,Excel,Outlook,我编写了此代码,以使用outlook从.net应用程序发送附加文件,代码如下: Microsoft.Office.Interop.Outlook.Application outlook = new Microsoft.Office.Interop.Outlook.Application(); Microsoft.Office.Interop.Outlook.Application session = new Microsoft.Office.Interop.Outlook
Microsoft.Office.Interop.Outlook.Application outlook = new Microsoft.Office.Interop.Outlook.Application();
Microsoft.Office.Interop.Outlook.Application session = new Microsoft.Office.Interop.Outlook.Application();
Microsoft.Office.Interop.Outlook.NameSpace ns = outlook.Session;
Outlook.MailItem mail = outlook.Application.CreateItem(Outlook.OlItemType.olMailItem) as Outlook.MailItem;
mail.Subject = txtSubject.Text;
mail.To = txtTo.Text;
mail.Subject = txtSubject.Text;
mail.Body = txtBody.Text;
mail.Attachments.Add(@"c:\Users\admin\Desktop\Excel.txt",
Outlook.OlAttachmentType.olByValue, Type.Missing,
Type.Missing);
Outlook.Accounts accounts = outlook.Session.Accounts;
foreach (Outlook.Account account in accounts)
{
// When the e-mail address matches, send the mail.
if (string.Equals(account.SmtpAddress, txtFrom.Text, StringComparison.OrdinalIgnoreCase))
{
mail.SendUsingAccount = account;
mail.Save();
((Outlook._MailItem)outlook).Send();
lblStatus.Text = "Report Sent";
break;
}
}
但是当它到达Send()方法调用时,我得到以下错误:
Unable to cast COM object of type 'Microsoft.Office.Interop.Outlook.ApplicationClass' 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)).
你投错了对象
outlook
定义为Microsoft.Office.Interop.outlook.Application
你需要改变
((Outlook._MailItem)outlook).Send();
致:
((Outlook._MailItem)mail).Send();