无法将HttpPostedFileBase对象转换为字节数组 [英] Can not convert HttpPostedFileBase object into byte array

问题描述

我正在尝试创建一种方法，在该方法中我可以传递图像文件并检索该图像文件的字节，因此以后可以将字节存储在数据库中.这是我的方法代码.

I am trying to create a method where I can pass an image file and retrieve bytes of that image file, so later I can store the bytes in database. Here is my code for the method.

private byte[] GetImageBytes(HttpPostedFileBase ProfilePhoto)
{
    if (ProfilePhoto != null)
    {
        using (MemoryStream ms = new MemoryStream())
        {
            ProfilePhoto.InputStream.CopyTo(ms);
            byte[] array = ms.GetBuffer();
            return array;
        }
    }
    else
    {
        return null;
    }
}

问题是我得到了一个字节数组array [0]，所以没有任何东西转换成字节.在调试模式下，我可以看到ProfilePhoto不为null，并且具有Length属性等.我尝试了另一种方法，将方法内部的代码替换为以下代码:

The problem is that I get an array of bytes array[0], so there is nothing converted into bytes. In debug mode I can see that the ProfilePhoto is not null and it has Length property etc... I tried another way by replacing the code inside the method with the code below:

byte[] image = new byte[ProfilePhoto.ContentLength];
ProfilePhoto.InputStream
    .Read(image, 0, Convert.ToInt32(ProfilePhoto.ContentLength));
return image;

但同样没有成功.它返回一个数组0x0000 ...，这是默认值. 知道如何解决这个问题吗?可能很简单，但我不了解如何在MVC中上传文件

but again no success. It returns an array 0x0000... which is the default value. Any idea how to solve this problem ? Probably it is very simple but I do not have knowledge on how to upload files in MVC

.我试图找到其他方法来做到这一点，但没有一个起作用.

. I tried to find other ways to do that but none of them worked.

推荐答案

复制之前，您需要先搜索流的开头:

You need to seek to the start of the stream first, before copying it:

ProfilePhoto.InputStream.Seek(0, SeekOrigin.Begin);
ProfilePhoto.InputStream.CopyTo(ms);

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