C# 如何使用 Stream 获取图像大小（wxh）
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how can I get image size (w x h) using Stream
提问by Mathematics
I have this code i am using to read uploaded file, but i need to get size of image instead but not sure what code can i use
我有这个代码我用来读取上传的文件，但我需要获取图像的大小，但不确定我可以使用什么代码
HttpFileCollection collection = _context.Request.Files;
for (int i = 0; i < collection.Count; i++)
{
HttpPostedFile postedFile = collection[i];
Stream fileStream = postedFile.InputStream;
fileStream.Position = 0;
byte[] fileContents = new byte[postedFile.ContentLength];
fileStream.Read(fileContents, 0, postedFile.ContentLength);
I can get the file right but how to check it's image (width and size) sir ?
我可以得到正确的文件，但如何检查它的图像（宽度和大小）先生？
采纳答案by Rob
First you have to write the image:
首先，您必须编写图像：
System.Drawing.Image image = System.Drawing.Image.FromStream (new System.IO.MemoryStream(byteArrayHere));
and afterwards you have the :
然后你有：
image.Height.ToString();
and the
和
image.Width.ToString();
note: you might want to add a check to be sure it's an image that was uploaded?
注意：您可能想添加一个检查以确保它是上传的图像？
回答by Mukund
HttpPostedFile file = null;
file = Request.Files[0]
if (file != null && file.ContentLength > 0)
{
System.IO.Stream fileStream = file.InputStream;
fileStream.Position = 0;
byte[] fileContents = new byte[file.ContentLength];
fileStream.Read(fileContents, 0, file.ContentLength);
System.Drawing.Image image = System.Drawing.Image.FromStream(new System.IO.MemoryStream(fileContents));
image.Height.ToString();
}
回答by Thorsten Westheider
Read the image into a buffer (you either have a Stream to read from or the byte[], because if you had the Image you'd have the dimensions anyway).
将图像读入缓冲区（您可以从 Stream 或字节 [] 中读取，因为如果您有图像，则无论如何都会有尺寸）。
public Size GetSize(byte[] bytes)
{
using (var stream = new MemoryStream(bytes))
{
var image = System.Drawing.Image.FromStream(stream);
return image.Size;
}
}
You can then go ahead and get the image dimensions:
然后，您可以继续获取图像尺寸：
var size = GetSize(bytes);
var width = size.Width;
var height = size.Height;
