Solved

How can I add Outlook attachments in C# using Late Binding?

Posted on 2010-09-13
4
1,786 Views
Last Modified: 2013-12-16
I need to send emails using Outlook, and I have to use late binding because users have various different versions of Outlook from XP through to 2010.  I cannot use MAPI because I have to be able to send HTML emails.

I have got it all working EXCEPT for adding attachments which fails because retrieving the Attachments property always returns null...  Presumably I am looking for the wrong properly or some other failing on my part!

The code so far is shown below, suggestions would be welcomed.

Chris Bray

public static void SendOutlookEmail(string fromAddress, string toAddress, string ccList, string bccList, string subject, string body, string attachmentList)

        {

            object objOutlookApplication;

            object objOutlookItem;

            Type objClassType;



            try

            {



                objClassType = Type.GetTypeFromProgID("Outlook.Application");



                if (objClassType != null)

                {



                    objOutlookApplication = Activator.CreateInstance(objClassType);

                    objOutlookItem = objOutlookApplication.GetType().InvokeMember("CreateItem", BindingFlags.InvokeMethod, null, objOutlookApplication, new object[] { 0 });



                    // Get all To addresses

                    string[] toAddresses;



                    if (toAddress.Length > 0)

                    {

                        toAddresses = toAddress.Split(';');

                        objOutlookItem.GetType().InvokeMember("To", BindingFlags.SetProperty, null, objOutlookItem, toAddresses);

                    }



                    // Get all CC addresses

                    string[] ccAddresses;

                    if (ccList.Length > 0)

                    {

                        ccAddresses = ccList.Split(';');

                        objOutlookItem.GetType().InvokeMember("CC", BindingFlags.SetProperty, null, objOutlookItem, ccAddresses);

                    }



                    // Get all BCC addresses

                    string[] bccAddresses;

                    if (bccList.Length > 0)

                    {

                        bccAddresses = bccList.Split(';');

                        objOutlookItem.GetType().InvokeMember("BCC", BindingFlags.SetProperty, null, objOutlookItem, bccAddresses);

                    }



                    // Subject

                    if (subject.Length > 0)

                    {

                        objOutlookItem.GetType().InvokeMember("Subject", BindingFlags.SetProperty, null, objOutlookItem, new string[] { subject });

                    }



                    // Body

                    if (body.Length > 0)

                    {

                        objOutlookItem.GetType().InvokeMember("HTMLBody", BindingFlags.SetProperty, null, objOutlookItem, new string[] { body });

                    }



                    // Attachments

                    // split out attachmentList

                    if (attachmentList.Length > 0)

                    {

                        object objAttachments = objOutlookItem.GetType().GetProperty("Attachments", BindingFlags.GetProperty); // Always returns null



                        string[] fileAttachments = attachmentList.Split(';');

                        foreach (string attachment in fileAttachments)

                        {

                            objAttachments.GetType().InvokeMember("Add", BindingFlags.InvokeMethod, null, objAttachments, new object[] { attachment, Type.Missing, Type.Missing, Type.Missing }); // Fails due to null objAttachments

                        }

                    }



                    

                    // Display the dialog

                    objOutlookItem.GetType().InvokeMember("Display", BindingFlags.InvokeMethod, null, objOutlookItem, new object[] { true });



                }

            }

            catch (Exception ex)

            {

                throw;

            }

            finally

            { 

                objOutlookApplication = null;

                objOutlookItem = null;

                objClassType = null;            

            }

        }

Open in new window

0
Comment
Question by:chrisbray
  • 2
4 Comments
 
LVL 12

Expert Comment

by:starlite551
Comment Utility
0
 
LVL 3

Author Comment

by:chrisbray
Comment Utility
Hi starlite551:

Why have you sent me that link?  As far as I can tell it has no relevance whatsoever to the question asked - for a start it is talking about wrting add-ins, and secondly it is using early binding when my question relates to late binding!

Chris Bray
0
 
LVL 13

Accepted Solution

by:
frankhelk earned 500 total points
Comment Utility
Since I'm not really familiar with these Outlook objects, I'm just speculating on a more theoretical level ....

I think this this returns (null) because the email object has not yet got anything attached ?

I've found something you should have a look at:

Search for "GetTypeFromProgID" on that page, you should reach the 4th message form "Mai08" within the second code snippet.

Take a look at that snippet and the way the attachments are added there (precisely: Find the comment "// Anhänge" (german for "Attachments") and the lines below.

Hope it helps.
0
 
LVL 3

Author Comment

by:chrisbray
Comment Utility
Hi frankhelk,

Thank you for that - bang on the money!  The answer is that you invoke the member Attachments rather than try to access the property.  For those who may find this thread when searching, and in case the link supplied gets broken, the resulting working code is shown below.

Chris Bray

                    // Attachments
                    // split out attachmentList
                    if (attachmentList.Length > 0)
                    {
                        objAttachments = objOutlookItem.GetType().InvokeMember("Attachments", BindingFlags.GetProperty, null , objOutlookItem, new object[] { Missing.Value });

                        fileAttachments = attachmentList.Split(';');
                        foreach (string attachment in fileAttachments)
                        {
                            objAttachments.GetType().InvokeMember("Add", BindingFlags.InvokeMethod, null, objAttachments, new object[] { attachment, Type.Missing, Type.Missing, Type.Missing });
                        }
                    }
0

Featured Post

IT, Stop Being Called Into Every Meeting

Highfive is so simple that setting up every meeting room takes just minutes and every employee will be able to start or join a call from any room with ease. Never be called into a meeting just to get it started again. This is how video conferencing should work!

Join & Write a Comment

Suggested Solutions

Recently while returning home from work my wife (another .NET developer) was murmuring something. On further poking she said that she has been assigned a task where she has to serialize and deserialize objects and she is afraid of serialization. Wha…
Many of us here at EE write code. Many of us write exceptional code; just as many of us write exception-prone code. As we all should know, exceptions are a mechanism for handling errors which are typically out of our control. From database errors, t…
This video explains how to create simple products associated to Magento configurable product and offers fast way of their generation with Store Manager for Magento tool.
You have products, that come in variants and want to set different prices for them? Watch this micro tutorial that describes how to configure prices for Magento super attributes. Assigning simple products to configurable: We assigned simple products…

763 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

9 Experts available now in Live!

Get 1:1 Help Now