Question

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.IO;

namespace newconvert
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        Bitmap bitmap;
        public void Form1_Load(object sender, EventArgs e)
        {
            String fileName = 
                @"C:\Users\Public\Pictures\Sample Pictures\Jellyfish.jpg";

            using (Stream bmpStream = 
                System.IO.File.Open(fileName, System.IO.FileMode.Open))
            {
                Image image = Image.FromStream(bmpStream);

                bitmap = new Bitmap(image);
                pictureBox1.Image = bitmap;
            }
        }

        private void pictureBox1_Click(object sender, EventArgs e)
        {
        }

        public void button1_Click(object sender, EventArgs e)
        {
            try
            {
                String fileName = 
                    @"C:\Users\Public\Pictures\Sample Pictures\Jellyfish.jpg";
                String fName = 
                    @"C:\Users\Public\Pictures\Sample Pictures\Tulips.jpg";
                String Naming = 
                    @"C:\Users\Public\Pictures\Sample Pictures\Hydrangeas.jpg";
                String Nam = 
                    @"C:\Users\Public\Pictures\Sample Pictures\Lighthouse.jpg";
                String Namd = 
                    @"C:\Users\Public\Pictures\Sample Pictures\Amazingly Funny People Photo #1 (11).jpg";

                using (Stream bmpStream = 
                    System.IO.File.Open(fileName, System.IO.FileMode.Open))
                {
                    bitmap.Dispose();
                    Image image = Image.FromStream(bmpStream);

                    bitmap = new Bitmap(image);
                    pictureBox2.Image = bitmap;
                    pictureBox2.Height = bitmap.Height;
                    pictureBox2.Width = bitmap.Width;    
                }

            }
            catch (Exception a)
            {
                MessageBox.Show("" + a);
            }
        }
     }
}

我在Windows应用程序中使用上面的代码将jpg文件转换为位图并流式传输它工作的图像。但我需要知道如何在wpf应用程序中执行此操作。我使用网格来设置图像。在网格中只有bitmapimage可用。我怎么能这样做？

Answer 1

尝试这样的事情

public BitmapImage ImageFromStream(Stream stream)
{
    var image = new BitmapImage();
    image.BeginInit();
    image.StreamSource = stream;
    image.EndInit();
    return image;
}

然后

using (Stream bmpStream = System.IO.File.Open(fileName, System.IO.FileMode.Open))
{
    var bitmapImage = ImageFromStream(bmpStream);
    // etc
}

Answer 2

来自：MSDN

// Open a Stream and decode a JPEG image
Stream imageStreamSource = new FileStream("tulipfarm.jpg", FileMode.Open, FileAccess.Read, FileShare.Read);
JpegBitmapDecoder decoder = new JpegBitmapDecoder(imageStreamSource, BitmapCreateOptions.PreservePixelFormat, BitmapCacheOption.Default);
BitmapSource bitmapSource = decoder.Frames[0];

// Draw the Image
Image myImage = new Image();
myImage.Source = bitmapSource;
myImage.Stretch = Stretch.None;
myImage.Margin = new Thickness(20);

如何将jpg图像转换为位图图像？

2 个答案: