1

我正在尝试使用 Outlook 后期绑定来获取 MailItem.AddressEntry 的 MAPIOBJECT。

我不断收到“调用目标引发了异常”和“指定转换无效”的内部异常，我不知道为什么。谷歌搜索等没有出现任何内容。

首先，我知道 MAPIOBJECT 已被弃用，并且通过智能感知不可见，但可以工作。

如果没有后期绑定，我可以毫无问题地获得对象。

这是代码：

/// <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);
        }
    }
}
4

2 回答 2

2

除非您必须按原样使用 MAPI 接口，否则我强烈建议您在 CodeProject 中使用MAPIEx项目。

这使得我们的 MAPI 集成非常非常顺利。

而且，在最坏的情况下，源代码可以阐明诸如此类的特定问题。

于 2012-01-11T00:29:07.173 回答
1

首先，MAPIOBJECT 没有被弃用，只是不可见。其次，您的代码在哪里运行？如果是outlook.exe 以外的exe（即您的代码不在COM 插件中），则必须调用MAPIInitialize()。

于 2012-01-10T23:58:53.810 回答