GDI无法保存PNG C#

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编辑：

这似乎是一个文件大小的问题.我正在使用的文件大小为10600 x 700像素.这最终是一个~280 MB的位图.我已经尝试将明显较小的文件大小(10×10)保存为PNG,它们正确地保存了.是否存在受GDI影响的尺寸限制？

几乎完整的代码：

class Converter
{
    /* Each PNG below is 50x50 */
    private static readonly int BLOCK_SIZE = 50;

    private static Dictionary<char, Bitmap> BlockLookup => new Dictionary<char, Bitmap>
    {
        {'R', new Bitmap("Content/Map/Blocks/RedBlock.png")},
        {'G', new Bitmap("Content/Map/Blocks/GreenBlock.png")},
        {'B', new Bitmap("Content/Map/Blocks/BlueBlock.png")},
        {'P', new Bitmap("Content/Map/Blocks/PurpleBlock.png")},
        {'Y', new Bitmap("Content/Map/Blocks/YellowBlock.png")},
        {'O', new Bitmap("Content/Map/Blocks/OrangeBlock.png")}
    };

    public void Convert(string textFilePath, string outputDirectory)
    {
        List<string> fileContents = new List<string>();
        /* Irrelevant loading code snipped, loads text file into fileContents */
        int width = fileContents.Max(line => line.Length) * BLOCK_SIZE; // 10600
        int height = fileContents.Count * BLOCK_SIZE; // 700

        /* Try to convert our text-file-as-image into a real image, mapping chars to their blocks */
        using (Bitmap bitmap = new Bitmap(width, height))
        {
            using (Graphics graphics = Graphics.FromImage(bitmap))
            {
                graphics.Clear(Color.WhiteSmoke);
                graphics.SmoothingMode = SmoothingMode.AntiAlias;

                for (int y = 0; y < fileContents.Count; ++y)
                {
                    for (int x = 0; x < fileContents[y].Length; ++x)
                    {
                        char currentCharacter = fileContents[y][x];
                        if (!blockLookup.ContainsKey(currentCharacter))
                        {
                            continue;
                        }
                        Bitmap mapBlock = blockLookup[currentCharacter];
                        var mapX = x * BLOCK_SIZE;
                        var mapY = y * BLOCK_SIZE;
                        graphics.DrawImage(mapBlock, new Point(mapX, mapY));
                    }
                }
                graphics.Flush(FlushIntention.Sync);
                graphics.Save();
            }
            if (!Directory.Exists(outputDirectory))
            {
                Directory.CreateDirectory(outputDirectory);
            }
            bitmap.Save(outputDirectory + mapName, ImageFormat.Png);
        }

    }
}

我有以下代码：

using (Bitmap bitmap = new Bitmap(width, height))
{
    using (Graphics graphics = Graphics.FromImage(bitmap))
    {
        graphics.Clear(Color.WhiteSmoke);
        /* SNIP, a bunch of image manipulation here */
        graphics.Flush();
    }

    if (!Directory.Exists(outputDirectory))
    {
        Directory.CreateDirectory(outputDirectory);
    }
    bitmap.Save(outputDirectory + imageName, ImageFormat.Bmp);
}

这段代码效果很好.但是,如果我将ImageFormat.Bmp中的ImageFormat更改为ImageFormat.Png,我会得到“GDI中发生一般错误.”.我已经搜索了stackoverflow和谷歌.文件不存在,路径确实存在.我删除了所有输出文件.我试过64bit& 32位构建.甚至像复制Bitmap和写入内存流这样的东西也会失败(以下不起作用)：

using (Bitmap bitmap = new Bitmap(width, height))
{
    using (Graphics graphics = Graphics.FromImage(bitmap))
    {
        graphics.Clear(Color.WhiteSmoke);
        /* SNIP, a bunch of image manipulation here */
        graphics.Flush();
    }

    if (!Directory.Exists(outputDirectory))
    {
        Directory.CreateDirectory(outputDirectory);
    }
    using (MemoryStream memoryStream = new MemoryStream())
    {
        Bitmap temp = new Bitmap(bitmap);
        temp.Save(memoryStream, ImageFormat.Png);
    }
}

我真的希望能够输出PNG文件.但是,似乎有些问题我不知道(我的版本？)的GDI和PNG文件.我有什么办法可以获得PNG输出吗？

解决方法:

抱歉,您的代码运行良好 – 我在Windows Server 2012 R2上使用VS 2013 Express for Win Desktop进行了测试 – 根本不是问题.

测试1：

private int width = 10600;
private int height = 700;
using (Bitmap bitmap = new Bitmap(width, height))
        {
            using (Graphics graphics = Graphics.FromImage(bitmap))
            {
                graphics.Clear(Color.Black);
                /* SNIP, a bunch of image manipulation here */
                graphics.Flush();

            }
            bitmap.Save("image.png", ImageFormat.Png);

        }
    }

测试2：

private int width = 10600;
private int height = 700;
using (Bitmap bitmap = new Bitmap(width, height))
        {
            using (Graphics graphics = Graphics.FromImage(bitmap))
            {
                graphics.Clear(Color.Black);
                /* SNIP, a bunch of image manipulation here */
                //I read a little around - maybe your graphics operations are out of sync?
                graphics.Flush(FlushIntention.Sync);
                graphics.Save();


            }

            using (MemoryStream memoryStream = new MemoryStream())
            {
                Bitmap temp = new Bitmap(bitmap);
                //temp.Save("image.png", ImageFormat.Png); //this worked obviously
                temp.Save(memoryStream, ImageFormat.Png);

                pictureBox1.Image = Image.FromStream(memoryStream); //a huge black box appears - everything is working fine
            }
        }
    }

也许你有系统问题？

我打算对此发表评论,但声誉不够=,(

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