What is the best practice for storing a file upload to a MemoryStream (C#)?

问题

I need to temporary store a file upload to a MemoryStream.

What would be the best method to do this using asp.net (3.5)?

Here's what I have so far. It works (locally tested), but it does not look right to me.

protected void lnkUploadFile_Click(object sender, EventArgs e)
    {
        MemoryStream memStream = new MemoryStream();

        BinaryWriter sWriter = new BinaryWriter(memStream);

        foreach (byte b in flUpload.FileBytes)
        {
            sWriter.Write(b);
        }

        sWriter.Flush();

        // writing to file to verify file stream converted correctly
        FileStream fstream = new FileStream(@"C:/test/" + flUpload.FileName, FileMode.Create);          
        memStream.WriteTo(fstream);         
        fstream.Dispose();

        memStream.Dispose();
    }

回答1:

If flUpload.FileBytes is a byte array, you can use the MemoryStream constructor that accepts the contained data as a parameter:

MemoryStream memStream = new MemoryStream(flUpload.FileBytes);

If not (if it just implements IEnumerable), you can convert it to a byte array using Linq:

MemoryStream memStream = new MemoryStream(flUpload.FileBytes.ToArray());

回答2:

    protected void lnkUploadFile_Click(object sender, EventArgs e)
    {
        using (MemoryStream memStream = new MemoryStream(flUpload.FileBytes))
        {
            using (FileStream fstream = new FileStream(@"C:/test/" + 
                flUpload.FileName, FileMode.Create))
            {
                memStream.WriteTo(fstream);
            }
        }
    }

回答3:

Might be easier to work with as a string... all depends on what you're going to do with it I guess.

System.IO.StreamReader reader = new System.IO.StreamReader("path");
string file = reader.ReadToEnd();

Or if you need the bytes there is actually a code snipet "filReadBin" you can use that produces this:

byte[] fileContents;
fileContents = System.IO.File.ReadAllBytes(@"C:\Test.txt");

回答4:

Just three lines.

if (flUpload.FileName.Length > 0)
{
   string directoryPath="C:\\SomeFolderName";
   flUpload.SaveAs(directoryPath + "\\" + fileUpload.FileName);
}

来源：https://stackoverflow.com/questions/1690337/what-is-the-best-practice-for-storing-a-file-upload-to-a-memorystream-c

标签

ASP.NET

file-upload

memorystream