指定的演員無效從MailItem.AddressEntry使用後期綁定獲取MAPIOBJECT

Question

我試圖使用Outlook的Late Binding來獲取MailItem.AddressEntry的MAPIOBJECT。

我不斷收到「異常已被調用目標拋出」和「指定的演員無效」的內部異常，我不知道爲什麼。谷歌搜索等什麼都沒有出現。

首先，我知道MAPIOBJECT已被棄用，並且通過智能感知不可見，但是可行。

沒有遲綁定，我可以得到對象沒有問題。

下面是代碼：

/// <summary> 
/// Gets the MAPI Object from the AddressEntry of the new recipient. 
/// </summary> 
/// <param name="senderName">The name of the sender to add to the recipients.</param> 
/// <param name="outlookApplication">The Outlook Application instance.</param> 
private static object GetMapiObject(string senderName, object outlookApplication) 
{ 
    var mailItem = InvokeMember("CreateItem", outlookApplication, new object[] { 0 }); 
    var recipients = GetProperty("Recipients", mailItem); 
    var recipient = InvokeMember("Add", recipients, new object[] { senderName }); 

    InvokeMember("Resolve", recipient, new object[] {}); 
    var addressEntry = GetProperty("AddressEntry", recipient); 

    var mapiObject = GetProperty("MAPIOBJECT", addressEntry); // Error occurs here. 
    return mapiObject; 
} 

/// <summary> 
/// Gets a property of an instance by its name 
/// </summary> 
/// <param name="propertyName">The property name to get.</param> 
/// <param name="instance">The object to get the property from.</param> 
/// <returns>The resulting object.</returns> 
private static object GetProperty(string propertyName, object instance) 
{ 
    Type type = instance.GetType(); 
    return type.InvokeMember(propertyName, BindingFlags.GetProperty, null, instance, new object[] { }); 
} 

/// <summary> 
/// Invoke an object by its method and type - takes parameters. 
/// </summary> 
/// <param name="method">The method to invoke.</param> 
/// <param name="instance">The object that contains the method to invoke.</param> 
/// <param name="parameters">The parameters to pass to the method.</param> 
/// <returns>The resulting object.</returns> 
private static object InvokeMember(string method, object instance, object[] parameters) 
{ 
    try 
    { 
     Type type = instance.GetType(); 
     return type.InvokeMember(method, BindingFlags.InvokeMethod, null, instance, parameters); 
    } 
    catch (Exception ex) 
    { 
     switch (method) 
     { 
      case "SaveAsFile": 
       throw new System.IO.IOException("Error occurred during \"SaveAsFile\" for attachments. Attachment filename may be too long. ", ex);             

      default: 
       throw new TargetInvocationException("Handled error at Invoke Member. Method Name: " + method, ex); 
     } 
    } 
} 

Answer 1

除非你必須像現在一樣使用MAPI接口，否則我會強烈建議在CodeProject中使用MAPIEx項目。

這使得我們的MAPI集成非常順利。

而且，最糟糕的情況是，源代碼可以闡明具體問題，比如這個。

Answer 2

首先，MAPIOBJECT不會被棄用，只是不可見。其次，你的代碼在哪裏運行？如果它是除outlook.exe以外的其他exe（即，您的代碼不在COM加載項中），則必須調用MAPIInitialize（）。