c#中如何区分拖放事件中的文件或文件夹?

问题描述

我有一个表单，您可以将文件拖放到其中，我想知道如何让应用程序知道数据是文件还是文件夹.

I have a form that you drag and drop files into and I was wondering how can I make the application know if the data is a file or a folder.

我的第一次尝试是寻找."在数据中，但有些文件夹确实有一个 .在他们之中.我也尝试过执行 File.Exists 和 Directory.Exists 条件，但它只搜索当前应用程序路径，而不搜索其他任何地方.

My first attempt was to look for a "." in the data but then some folders do have a . in them. I've also tried doing a File.Exists and a Directory.Exists condition but then it only searches on the current application path and not anywhere else.

无论如何我可以以某种方式将 .Exists 应用到特定目录中，或者有什么方法可以检查将什么类型的数据拖到表单中?

Is there anyway I can somehow apply the .Exists in a specific directory or is there a way I can check what type of data is dragged into the form?

推荐答案

将路径作为字符串，您可以使用 System.IO.File.GetAttributes(string path) 获取 FileAttributes 枚举，然后检查 FileAttributes.Directory 标志是否为设置.

Given the path as a string, you can use System.IO.File.GetAttributes(string path) to get the FileAttributes enum, and then check if the FileAttributes.Directory flag is set.

要检查 .NET 4.0 之前的 .NET 版本中的文件夹，您应该这样做:

To check for a folder in .NET versions prior to .NET 4.0 you should do:

FileAttributes attr = File.GetAttributes(path);
bool isFolder = (attr & FileAttributes.Directory) == FileAttributes.Directory;

在较新的版本中，您可以使用 HasFlag 方法获得相同的结果:

In newer versions you can use the HasFlag method to get the same result:

bool isFolder = File.GetAttributes(path).HasFlag(FileAttributes.Directory);

还要注意 FileAttributes 可以提供有关文件/文件夹的各种其他标志，例如:

Note also that FileAttributes can provide various other flags about the file/folder, such as:

• FileAttributes.Directory:路径代表文件夹
• FileAttributes.Hidden:文件被隐藏
• FileAttributes.Compressed:文件已压缩
• FileAttributes.ReadOnly:文件是只读的
• FileAttributes.NotContentIndexed:从索引中排除

• FileAttributes.Directory: path represents a folder
• FileAttributes.Hidden: file is hidden
• FileAttributes.Compressed: file is compressed
• FileAttributes.ReadOnly: file is read-only
• FileAttributes.NotContentIndexed: excluded from indexing

等等

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