难以将图像保存到 MemoryStream

问题描述

我在将字节流从图像(在本例中为 jpg)保存到 System.IO.MemoryStream 对象时遇到了一些困难.目标是将System.Drawing.Image 保存到MemoryStream，然后使用MemoryStream 将图像写入字节数组(我最终需要将它插入到数据库中).但是，在 MemoryStream 关闭后检查变量 data 表明所有字节都为零......我很困惑，不确定我做错了什么...

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...
}

任何见解将不胜感激！

推荐答案

要将数据从流加载到数组中，您读取，而不是写入(并且您将需要倒带).但是，在这种情况下，更简单的是，ToArray():

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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