c# - 限制图像大小

Question

我的 WinForm 中有一个 OpenFileDialog，我希望何时选择图像以将图像的大小限制在 100 Ko 和尺寸在 350x350。

我该怎么做？？

Answer 1

private bool ValidFile(string filename, long limitInBytes, int limitWidth, int limitHeight)
        {
            var fileSizeInBytes = new FileInfo(filename).Length;
            if(fileSizeInBytes > limitInBytes) return false;

            using(var img = new Bitmap(filename))
            {
                if(img.Width > limitWidth || img.Height > limitHeight) return false;
            }

            return true;
        }

        private void selectImgButton_Click(object sender, EventArgs e)
        {
            if (openFileDialog1.ShowDialog() == DialogResult.OK)
            {
                if(ValidFile(openFileDialog1.FileName, 102400, 350, 350))
                {
                    // Image is valid and U can
                    // Do something with image
                    // For example set it to a picture box
                    pictureBox1.Image = new Bitmap(openFileDialog1.FileName);
                }
                else
                {
                    MessageBox.Show("Image is invalid");
                }
            }
        }