限制图像大小 [英] Limit image size

问题描述

我的 WinForm 中有一个 OpenFileDialog，我想何时选择一个图像以将图像的大小限制为 100 Ko，并将尺寸限制为 350x350.

I have an OpenFileDialog in my WinForm and I want when to select an image to limit the image's size in 100 Ko and the Dimensions in 350x350.

我该怎么做??

推荐答案

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");
                }
            }
        }

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