如何简化此 MemoryStream 代码

发布于 2024-08-08 13:01:05 字数 874 浏览 6 评论 0原文

此代码返回从字节数组加载的图像的缩略图。我试图理解为什么作者使用 4 个内存流，以及是否有一种简单的方法可以重写它，或者这样是否可以。

public Image GetThumbnail(int height, int width)
{
    //load the image from a byte array (imageData)
    using (MemoryStream mem = new MemoryStream(this.imageData))
    {
        // Create a Thumbnail from the image
        using (Image thumbPhoto = Image.FromStream(mem, 
            true).GetThumbnailImage(height, width, null, 
            new System.IntPtr()))
        {
            // Convert the Image object to a byte array
            using (MemoryStream ms = new MemoryStream())
            {
                thumbPhoto.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);
                using (MemoryStream m = new MemoryStream(ms.ToArray()))
                {
                    return Image.FromStream(m, true);
                }
            }
        }
   }
}

原文

This code returns a thumbnail of an image loaded from a byte array. I'm trying to understand why the author is using 4 memory streams and if there is a simple way of rewriting this or if it is okay the way it is.

public Image GetThumbnail(int height, int width)
{
    //load the image from a byte array (imageData)
    using (MemoryStream mem = new MemoryStream(this.imageData))
    {
        // Create a Thumbnail from the image
        using (Image thumbPhoto = Image.FromStream(mem, 
            true).GetThumbnailImage(height, width, null, 
            new System.IntPtr()))
        {
            // Convert the Image object to a byte array
            using (MemoryStream ms = new MemoryStream())
            {
                thumbPhoto.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);
                using (MemoryStream m = new MemoryStream(ms.ToArray()))
                {
                    return Image.FromStream(m, true);
                }
            }
        }
   }
}

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落叶缤纷 2024-08-15 13:01:05

他实际上在这里只使用了 3 个 MemoryStream，但他只需要使用 2 个（我认为）。您应该能够将此代码替换

using (MemoryStream m = new MemoryStream(ms.ToArray()))                
{                    
    return Image.FromStream(m, true);                
}

为

ms.Seek(0, SeekOrigin.Begin);
return Image.FromStream(ms, true);

：我认为他创建了第三个 MemoryStream 因为 ms MemoryStream 不在开头。

He's actually only using 3 MemoryStreams here, but he needs to only use 2 (I think). You should be able to replace this code:

using (MemoryStream m = new MemoryStream(ms.ToArray()))                
{                    
    return Image.FromStream(m, true);                
}

with this:

ms.Seek(0, SeekOrigin.Begin);
return Image.FromStream(ms, true);

I think he created the third MemoryStream because the ms MemoryStream wasn't at the beginning.

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挽手叙旧 2024-08-15 13:01:05

public Image GetThumbnail(int height, int width)
{
    //load the image from a byte array (imageData)
    using (MemoryStream mem = new MemoryStream(this.imageData))
    {
        // Create a Thumbnail from the image
        using (Image thumbPhoto = Image.FromStream(mem, 
            true).GetThumbnailImage(height, width, null, 
            new System.IntPtr()))
        {
            return thumbPhoto;
        }
   }
}

我认为这是正确的

public Image GetThumbnail(int height, int width)
{
    //load the image from a byte array (imageData)
    using (MemoryStream mem = new MemoryStream(this.imageData))
    {
        // Create a Thumbnail from the image
        using (Image thumbPhoto = Image.FromStream(mem, 
            true).GetThumbnailImage(height, width, null, 
            new System.IntPtr()))
        {
            return thumbPhoto;
        }
   }
}

i think this will be right

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