转自：http://www.cnblogs.com/madebychina/archive/2011/09/20/madebychina_2.html
C#使用如下代码调用Outlook2003发送邮件：
1 // Create the Outlook application. 2 Outlook.Application oApp =new Outlook.Application(); 3 //Outlook.ApplicationClass oApp = new Outlook.ApplicationClass(); 4 5 // Get the NameSpace and Logon information. 6 Outlook.NameSpace oNS = oApp.GetNamespace("mapi"); 7 8 // Log on by using a dialog box to choose the profile. 9 oNS.Logon(Missing.Value, Missing.Value, true, true); 10 11 // Alternate logon method that uses a specific profile. 12 // TODO: If you use this logon method, 13 // change the profile name to an appropriate value. 14 //oNS.Logon("YourValidProfile", Missing.Value, false, true); 15 16 // Create a new mail item.17 Outlook.MailItem oMsg = (Outlook.MailItem)oApp.CreateItem(Outlook.OlItemType.olMailItem); 18 19 // Set the subject.20 oMsg.Subject ="mail"; 21 //oMsg.Attachments.Add("C:\mailLog.txt", Outlook.OlItemType.olMailItem, 1, "report"); 22 23 // Set HTMLBody.24 String sHtml; 25 sHtml ="<HTML> "+26 "<HEAD> "+27 "<TITLE>Sample GIF</TITLE> "+28 "</HEAD> "+29 "<BODY><P> "+30 "<h1><Font Color=Green>Inline graphics</Font></h1></P> "+31 "</BODY> "+32 "</HTML>"; 33 oMsg.HTMLBody = sHtml; 34 35 // Add a recipient.36 Outlook.Recipients oRecips = (Outlook.Recipients)oMsg.Recipients; 37 // TODO: Change the recipient in the next line if necessary.38 string reciMailAdress=this.txtMail.Text; 39 Outlook.Recipient oRecip = (Outlook.Recipient)oRecips.Add(reciMailAdress); 40 oRecip.Resolve(); 41 42 // Send.43 oMsg.Send(); 44 //((Microsoft.Office.Interop.Outlook._MailItem)oMsg).Send(); 45 46 // Log off.47 oNS.Logoff(); 48 49 // Clean up.50 oRecip =null; 51 oRecips =null; 52 oMsg =null; 53 oNS =null; 54 oApp =null;
但是因为Outlook2003的安全机制，总是会弹出安全提示对话框，如下：
而且在我们选择允许访问，点击“是”按钮后还会弹出另外一个对话框，如下：
并且“是”按钮还会被冻结5秒钟。分析原因是我们使用的是Outlook.MailItem邮件模式，这是一种非安全的模式，所以在第三方程序调用Outlook2003时会弹出确认对话框，如何来避免弹出安全提示对话框呢？我们可以使用SafeMailItem模式。但是在使用这种模式时需要引用Redemption.dll，而且还要安装Redemption插件，代码如下：
1 privatevoid Send() 2 { 3 Outlook.Application olApp =new Outlook.ApplicationClass(); 4 Outlook.NameSpace olNS = olApp.GetNamespace("MAPI"); 5 olNS.Logon(Missing.Value, Missing.Value, false, false); 6 SafeMailItem sItem =new Redemption.SafeMailItem(); 7 8 Outlook.MailItem olItem = olApp.CreateItem(0) as Outlook.MailItem; 9 10 String sHtml; 11 sHtml ="<HTML> "+12 "<HEAD> "+13 "<TITLE>Sample GIF</TITLE> "+14 "</HEAD> "+15 "<BODY><P> "+16 "<h1><Font Color=Green>Inline graphics</Font></h1></P> "+17 "</BODY> "+18 "</HTML>"; 19 olItem.HTMLBody = sHtml; 20 21 sItem.Item = olItem; 22 23 string reciMailAdress=txtMail.Text; 24 sItem.Recipients.Add(reciMailAdress); 25 sItem.Recipients.ResolveAll(); 26 SetPropValue(sItem, "Subject", "Testing Redemption"); 27 sItem.Send(); 28 } 29 30 privatestaticobject GetPropValue(object item, string propertyName) 31 { 32 33 try34 { 35 object[] args =new Object[]{}; // dummy argument array36 Type type = item.GetType(); 37 return type.InvokeMember( 38 propertyName, 39 BindingFlags.Public | BindingFlags.GetField 40 | BindingFlags.GetProperty, 41 null, 42 item, 43 args); 44 } 45 catch (SystemException ex) 46 { 47 // Console.WriteLine( 48 // string.Format( 49 // "GetPropValue for {0} Exception: {1} ", 50 // propertyName, ex.Message));51 } 52 returnnull; 53 } 54 privatestaticvoid SetPropValue(object item, string propertyName,object propertyValue) 55 { 56 try57 { 58 object[] args =new Object[1]; 59 args[0] = propertyValue; 60 Type type = item.GetType(); 61 type.InvokeMember(propertyName, 62 BindingFlags.Public | BindingFlags.SetField |63 BindingFlags.SetProperty, 64 null, 65 item, 66 args); 67 } 68 catch (SystemException ex) 69 { 70 // Console.WriteLine( 71 // string.Format( 72 // "SetPropValue for {0} Exception: {1} ", 73 // propertyName, ex.Message));74 } 75 return; 76 }
这样就能避免弹出对话框了，其他高版本的Outlook好像没有此问题，Outlook2007在开启反病毒软件时不会弹出对话框。
Redemption下载地址：http://www.dimastr.com/redemption/download.htm