转换HttpPostedFileBase为byte [] [英] Convert HttpPostedFileBase to byte[]

问题描述

在我的MVC应用程序中，我使用以下code上传文件。

MODEL

 公共HttpPostedFileBase文件{搞定;组; }
 

查看

  @ Html.TextBoxFor（M = GT; m.File，新的{type =文件}）
 

一切工作正常。但我想结果FIEL转换为byte []我。如何能做到这一点。

控制器

 公众的ActionResult ManagePhotos（M​​anagePhotos模型）
    {
        如果（ModelState.IsValid）
        {
            字节[] =图像model.File; //它不工作。如何可以将其转换为字节数组
        }
     }
 

解决方案

由于达林说，可以从输入流中读取 - 但我会避免依赖单一全力以赴数据是可用的。如果您在使用.NET 4，这是简单的：

  MemoryStream的目标=新的MemoryStream（）;
model.File.InputStream.CopyTo（目标）;
字节[]数据= target.ToArray（）;
 

这是很容易，如果你想要写 CopyTo从相当于在.NET 3.5。最重要的部分是您从<读href=\"http://msdn.microsoft.com/en-us/library/system.web.httppostedfilebase.inputstream.aspx\"><$c$c>HttpPostedFileBase.InputStream.

有关高效的目的，您的可能的检查返回的流是否已经是的MemoryStream ：

 字节[]数据;
使用（流的InputStream = model.File.InputStream）
{
    的MemoryStream MemoryStream的=的InputStream为MemoryStream的;
    如果（MemoryStream的== NULL）
    {
        MemoryStream的=新的MemoryStream（）;
        inputStream.CopyTo（MemoryStream的）;
    }
    数据= memoryStream.ToArray（）;
}
 

In my MVC application, I am using following code to upload a file.

MODEL

 public HttpPostedFileBase File { get; set; }

VIEW

@Html.TextBoxFor(m => m.File, new { type = "file" })

Everything working fine .. But I am trying to convert the result fiel to byte[] .How can i do this

CONTROLLER

 public ActionResult ManagePhotos(ManagePhotos model)
    {
        if (ModelState.IsValid)
        {
            byte[] image = model.File; //Its not working .How can convert this to byte array
        }
     }

解决方案

As Darin says, you can read from the input stream - but I'd avoid relying on all the data being available in a single go. If you're using .NET 4 this is simple:

MemoryStream target = new MemoryStream();
model.File.InputStream.CopyTo(target);
byte[] data = target.ToArray();

It's easy enough to write the equivalent of CopyTo in .NET 3.5 if you want. The important part is that you read from HttpPostedFileBase.InputStream.

For efficient purposes you could check whether the stream returned is already a MemoryStream:

byte[] data;
using (Stream inputStream = model.File.InputStream)
{
    MemoryStream memoryStream = inputStream as MemoryStream;
    if (memoryStream == null)
    {
        memoryStream = new MemoryStream();
        inputStream.CopyTo(memoryStream);
    }
    data = memoryStream.ToArray();
}

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