在C＃中保存图像文件

Question

我们如何在C＃中保存图像文件（jpg或png等类型）？

Answer 1

in c# us the Image.Save Method with these parameters (string Filename , ImageFormat)

http://msdn.microsoft.com/en-us/library/9t4syfhh.aspx

Is that all you needed?

// Construct a bitmap from the button image resource.
Bitmap bmp1 = new Bitmap(typeof(Button), "Button.bmp");

// Save the image as a GIF.
bmp1.Save("c:\\button.gif", System.Drawing.Imaging.ImageFormat.Gif);

Answer 2

Image bitmap = Image.FromFile("C:\\MyFile.bmp");
bitmap.Save("C:\\MyFile2.bmp");  

You should be able to use the Save Method from the Image Class and be just fine as shown above. The Save Method has 5 different options or overloads...

  //Saves this Image  to the specified file or stream.
  img.Save(filePath);

  //Saves this image to the specified stream in the specified format.
  img.Save(Stream, ImageFormat);

  //Saves this Image to the specified file in the specified format.
  img.Save(String, ImageFormat);

  //Saves this image to the specified stream, with the specified encoder and image encoder parameters.
  img.Save(Stream, ImageCodecInfo, EncoderParameters);

  //Saves this Image to the specified file, with the specified encoder and image-encoder parameters.
  img.Save(String, ImageCodecInfo, EncoderParameters);

Answer 3

如果您需要比.Net Framework提供的更广泛的图像处理，请查看FreeImage项目

Answer 4

            SaveFileDialog sv = new SaveFileDialog();
            sv.Filter = "Images|*.jpg ; *.png ; *.bmp";
            ImageFormat format = ImageFormat.Jpeg;

            if (sv.ShowDialog() == DialogResult.OK)
            {

                switch (sv.Filter )
                {
                    case ".jpg":

                        format = ImageFormat.Png;
                        break;

                    case ".bmp":

                        format = ImageFormat.Bmp;
                        break;
                }


                pictureBox.Image.Save(sv.FileName, format);
            }