无法保存图像到的MemoryStream [英] Difficulty Saving Image To MemoryStream

问题描述

我有一个 System.IO.MemoryStream 目标有些难度从图像保存的字节流（在这种情况下，JPG格式）。我们的目标是要保存为System.Drawing.Image 到的MemoryStream ，然后用的MemoryStream 来将图像写入字节数组（我最终需要将其插入到数据库）。然而，检查变量数据的的MemoryStream 关闭显示，所有字节都是零后...我敢住了，不知道从哪里我做错了...

I'm having some difficulty saving a stream of bytes from an image (in this case, a jpg) to a System.IO.MemoryStream object. The goal is to save the System.Drawing.Image to a MemoryStream, and then use the MemoryStream to write the image to an array of bytes (I ultimately need to insert it into a database). However, inspecting the variable data after the MemoryStream is closed shows that all of the bytes are zero... I'm pretty stumped and not sure where I'm doing wrong...

using (Image image = Image.FromFile(filename))
{
    byte[] data;

    using (MemoryStream m = new MemoryStream())
    {
        image.Save(m, image.RawFormat);
        data = new byte[m.Length];
        m.Write(data, 0, data.Length);
    }

    // Inspecting data here shows the array to be filled with zeros...
}

任何见解将非常感激！

推荐答案

要加载从数据流进一个数组，你的阅读的，不是的写的（你将需要倒带）。但是，更简单地在这种情况下， ToArray的（）：使用

To load data from a stream into an array, you read, not write (and you would need to rewind). But, more simply in this case, ToArray():

using (MemoryStream m = new MemoryStream())
{
    image.Save(m, image.RawFormat);
    data = m.ToArray();
}

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