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无法隐式转换类型'Microsoft.Office.Interop.Outlook.MAPIFolder文件夹'收件人'Microsoft.Office.Interop.Outlook文件夹'

visual-studio c#

Gaurav Thantry · 技术社区 · 6 年前

我是新来的。我能够用C语言编写代码,因为我是java程序员,而且C语言也是面向对象的。请记住,我在这里解释的一些术语可能是java的。

如何使用C#中的folder方法在子文件夹之间迭代?我已经初始化了 subFolders 方法的对象 folders 全班同学 Outlook 存储所有子文件夹(如果有)。我用的是 for subFolder 目标 folder 方法中保存当前迭代文件夹 子文件夹

子文件夹 对象。

错误消息: Cannot implicitly convert type 'Microsoft.Office.Interop.Outlook.MAPIFolder' to 'Microsoft.Office.Interop.Outlook.Folder'. An Implicit conversion exists (are you missing a cast?)

以下是代码的一部分:

 static void enumerateFolders(Outlook.Folder folder)  //Checks if there are sub folders inside the Inbox folder.
        {
            Outlook.Folders subfolders = folder.Folders;
            if (subfolders.Count > 0)
            {
                for (int i = 0; i < subfolders.Count; i++)
                {
                    Outlook.Folder subFolder = subfolders[i];  //This is where I am getting the error.
                    iterateMessages(subFolder);
                }
            }
            else
            {
                iterateMessages(folder); 
            }
        }

2 回复 | 直到 6 年前

BugFinder 6 年前

我使用了mapifolders,这段代码在许多版本的outlook中都适用(用它来建立我们习惯的\\pst\folder\folder2类型的路径)

public struct Flder
{
    public String name;
    public MAPIFolder folder;
}

...

private static void WalkTree(Folders topfolder, String path)
{
    if (topfolder.Count > 0)
    {
        foreach (MAPIFolder f in topfolder.AsParallel())
        {
            if (!f.Name.Contains("Public"))
            {
                Flder fld = new Flder();
                fld.name = path + "\\" + f.Name;
                fld.folder = f;
                folderList.Add(fld);
                try
                {
                    WalkTree(f.Folders, path + "\\" + f.Name);
                }
                catch
                {
                    continue; // skip any errors
                }
            }
        }
    }
}

Gaurav Thantry 6 年前

我找到解决办法了。我所要做的就是将子文件夹类型转换为 Outlook.Folder

 static void enumerateFolders(Outlook.Folder folder)  //Checks if there are sub folders inside the Inbox folder.
        {
            Outlook.Folders subfolders = folder.Folders;
            if (subfolders.Count > 0)
            {
                for (int i = 0; i < subfolders.Count; i++)
                {
                    Outlook.Folder subFolder = (Outlook.Folder) subfolders[i];  //Solution: type casted
                    iterateMessages(subFolder);
                }
            }
            else
            {
                iterateMessages(folder);     //This implements the core functionality of the program. It iterates amongst the emails to retrieve the clearstream attachment.
            }
        }