C＃的imageformat串 [英] C# ImageFormat to string

问题描述

我如何从的 System.Drawing.ImageFormat 的对象获得的人类可读的字符串（即图像格式本身）？

How can I obtain human readable string(i.e. image format itself) from System.Drawing.ImageFormat object?

我的意思是，如果我有 ImageFormat.Png 是可以将其转换为？PNG串

I mean if I have ImageFormat.Png is that possible to convert it to "png" string?

编辑：我在这里看到了一些误解。这里是我的代码：

I see some misunderstanding here. Here is mine code:

Image objImage = Image.FromStream(file);

ImageFormat imFormat = objImage.RawFormat;

imFormat.ToString(); 

返回 [的imageformat：b96b3caf-0728-11d3- 9d7b-0000f81ef32e] ，但我想要的巴！

It returns "[ImageFormat: b96b3caf-0728-11d3-9d7b-0000f81ef32e]" but I want "Png"!

推荐答案

ImageFormat.Png.ToString（）返回巴...

编辑：好的，看来的ToString 只返回的imageformat 由静态属性返回实例的名称..

OK, it seems ToString returns the name only for ImageFormat instances returned by the static properties...

您可以创建一个查找字典，从该GUID获取名称：

You could create a lookup dictionary to get the name from the Guid:

private static readonly Dictionary<Guid, string> _knownImageFormats =
            (from p in typeof(ImageFormat).GetProperties(BindingFlags.Static | BindingFlags.Public)
             where p.PropertyType == typeof(ImageFormat)
             let value = (ImageFormat)p.GetValue(null, null)
             select new { Guid = value.Guid, Name = value.ToString() })
            .ToDictionary(p => p.Guid, p => p.Name);

static string GetImageFormatName(ImageFormat format)
{
    string name;
    if (_knownImageFormats.TryGetValue(format.Guid, out name))
        return name;
    return null;
}

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