检查文件在C＃中的媒体文件 [英] Check if file is a media file in C#

问题描述

我需要一种方法，可以告诉我，如果一个文件是图像，音频或视频文件。我能做到这一点的C＃？

I need a method that could tell me if a file is image, audio or video file. Can I do this with C#?

推荐答案

这取决于你想要如何稳健它是。

It depends how robust you want it to be.

要做到这一点最简单的方法是检查的延伸，是这样的：

The simplest way to do it is to check the extension, like this:

static string[] mediaExtensions = {
    ".PNG", ".JPG", ".JPEG", ".BMP", ".GIF", //etc
    ".WAV", ".MID", ".MIDI", ".WMA", ".MP3", ".OGG", ".RMA", //etc
    ".AVI", ".MP4", ".DIVX", ".WMV", //etc
};

static bool IsMediaFile(string path) {
    return -1 != Array.IndexOf(mediaExtensions, Path.GetExtension(path).ToUpperInvariant());
}

修改：对于那些谁真的想LINQ，这里是：

EDIT: For those who really want LINQ, here it is:

return mediaExtensions.Contains(Path.GetExtension(path), StringComparer.OrdinalIgnoreCase);

请注意，一个文件的扩展名是不是其内容的可靠指标;任何人都可以重命名文件并更改其扩展名。

Note that a file's extension is not a reliable indicator of its content; anyone can rename a file and change its extension.

如果您还没有扩展名，或者，如果你不相信它，你可以阅读的开始文件，看它是否常见媒体格式文件的签名相匹配。

If you don't have the extension, or if you don't trust it, you can read the beginning of the file and see if it matches file signatures for common media formats.

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