字节转换为asp.net中的字节数？ [英] Bytes to bytes Conversion in asp.net?

问题描述

protected void btnSubmit_Click(object sender, EventArgs e)
    {

        if (fpPhoto.HasFile)
        {
            if (fpPhoto.PostedFile.ContentType == "image/jpg" || fpPhoto.PostedFile.ContentType == "image/jpeg" || fpPhoto.PostedFile.ContentType == "image/png")
            {
                byte[] imagebytes = new byte[fpPhoto.PostedFile.ContentLength];
               int filelenght = fpPhoto.PostedFile.ContentLength;
               imagebytes = fpPhoto.FileBytes;
               fpPhoto.PostedFile.InputStream.Read(imagebytes, 0, filelenght);
            }
        }

        User objUser = new User();

            objUser.UserName_Pk = txtUserName.Text;
            objUser.Password = txtPassword.Text;
            objUser.MobileNo = txtMobileNo.Text;
            objUser.Email = txtEmail.Text;
            objUser.SecurityAnswer = txtAnswer.Text;
            objUser.Photo = Convert.ToByte(imagebytes);//Here is the problem

        objUserBll.InsertUpdate(objUser);

推荐答案

如果您尝试将其转换为图像 - 和我想不出你想要把它转换成什么 - 然后试试这个：

If you are trying to convert it to an image - and I can't think of anything else you'd want to convert it to - then try this:

MemoryStream ms = new MemoryStream(imagebytes);
Image returnImage = Image.FromStream(ms);

但是......你需要移动你的定义：imagesbytes超出了你试图使用它的范围。

试试这个：

But...you need to move your definitions about anyway: imagesbytes is out of scope where you are trying to use it.
Try this:

Image userImage = null;
if (fpPhoto.HasFile)
{
    if (fpPhoto.PostedFile.ContentType == "image/jpg" || 
        fpPhoto.PostedFile.ContentType == "image/jpeg" || 
        fpPhoto.PostedFile.ContentType == "image/png")
    {
       userImage = Image.FromStream(fpPhoto.PostedFile.InputStream);
    }
}

User objUser = new User();

objUser.UserName_Pk = txtUserName.Text;
objUser.Password = txtPassword.Text;
objUser.MobileNo = txtMobileNo.Text;
objUser.Email = txtEmail.Text;
objUser.SecurityAnswer = txtAnswer.Text;
objUser.Photo = userImage;

objUserBll.InsertUpdate(objUser);

问题在于 imagebytes 是一个字节数组。



因此你永远无法将它转换成单个字节，这就是Convert.ToByte（）所做的。



这段代码究竟应该做什么？ User.Photo是什么类型的数据类型？

The problem is that imagebytes is a byte array.

As such you will never be able to convert it into a single byte, which is what Convert.ToByte() does.

What exactly is this code supposed to do? What sort of data type is User.Photo?

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