C＃WPF显示到画布的位图 [英] C# WPF Show Bitmap To Canvas

问题描述

您好我正在使用WPF项目并且需要在画布中使用Sqlite显示图像。

  Int32  i =  1 ; 
  if （i >   0 ）
 {
 DataRow dataRow = helper.DataSet.Tables [ 0 ]。行[i  -   1 ]; 
  //  从数据库获取字节 
  byte  [] imageBytes =（ byte  []）dataRow [ 8 ]; 
 MemoryStream ms =  new  MemoryStream（imageBytes）; 
 
 System.Drawing.Bitmap bmap =  new  System.Drawing.Bitmap（ms）; 
 
  IntPtr  hBitmap = bmap.GetHbitmap（）; 
 Image MyImg = New Image（）; 
  //  将位图转换为图像 
 MyImg.Source = System.Windows。 Interop.Imaging.CreateBitmapSourceFromHBitmap（hBitmap， IntPtr  .Zero，Int32Rect.Empty，BitmapSizeOptions.FromEmptyOptions（））; 
 
 
 mycanvas.Children.Clear（）; 
 RemoveLogicalChild（MyImg）; 
 mycanvas.Children.Add（MyImg）; 

但是在mycanvas.Children.Add（MyImg）我收到错误指定的元素已经是另一个元素的逻辑子元素。首先断开它。



任何人都可以告诉我如何解决这个问题？



关注

解决方案

您好b $ b试试这个

 MemoryStream Ms =  new  MemoryStream（）; 
 System.Drawing.Bitmap ObjBitmap =  null ; 
 ObjBitmap =  //  加载你的图片;  
 ObjBitmap.Save（女士， System.Drawing.Imaging.ImageFormat.Bmp）; 
 Ms.Position =  0 ; 
 BitmapImage ObjBitmapImage =  new  BitmapImage（）; 
 ObjBitmapImage.BeginInit（）; 
 ObjBitmapImage.StreamSource = Ms; 
 ObjBitmapImage.EndInit（）; 
 ImageControl.Source = ObjBitmapImage; 
 < /   pre  >  
 

这是我的代码我从我的数据库获取图像字节数组并将其转换为位图当我想在画布上显示它我得到此错误



我有其他方法将位图转换为图像并在画布盒中显示它吗？

  private   void  comboBox1_SelectionChanged（ object  sender，SelectionChangedEventArgs e）
 {
 selected_table_name = comboBox1.SelectedItem.ToString（）; 
  string  connectionString =  数据源= C ：\\Gallery\\Appdb.sqlite; 
 
  //  确定DataAdapter = CommandText +连接 
 < span class =code-keyword> string  commandText =  @  SELECT * FROM + selected_table_name +   ORDER BY ID; 
 
  //  制作新对象 
 helper =  new  dBHelper（connectionString）; 
 
  //  加载数据 
  if （helper.Load（commandText， ）==  true ）
 {
  //  在datagridview中显示数据 
 dataGridViewImageList.ItemsSource = helper.DataSet.Tables [ 0 ]。DefaultView; 
  //   System.Windows.Visibility.Visible  
 dataGridViewImageList.Columns [< span class =code-digit> 8 ]。可见性= System.Windows.Visibility.Collapsed; 
 dataGridViewImageList.Columns [ 6 ]。Visibility = System.Windows.Visibility.Collapsed; 
  Int32  i =  1 ; 
  if （i >   0 ）
 {
 DataRow dataRow = helper.DataSet.Tables [ 0 ]。行[i  -   1 ]; 
  //  从数据库获取字节 
  byte  [] imageBytes =（ byte  []）dataRow [ 8 ]; 
 MemoryStream ms =  new  MemoryStream（imageBytes）; 
 
 System.Drawing.Bitmap bmap =  new  System.Drawing.Bitmap（ms）; 
 
  IntPtr  hBitmap = bmap.GetHbitmap（）; 
  //  将位图转换为图像 
 MyImg.Source = System.Windows。 Interop.Imaging.CreateBitmapSourceFromHBitmap（hBitmap， IntPtr  .Zero，Int32Rect.Empty，BitmapSizeOptions.FromEmptyOptions（））; 
 
 
 mycanvas.Children.Clear（）; 
 RemoveLogicalChild（MyImg）; 
 mycanvas.Children.Add（MyImg）; 
 
} 
 
} 
 
} 

此致

Hi I Working On WPF Project And Need To Show Image From Sqlite In Canvas.

Int32 i = 1;
                if (i > 0)
                {
                    DataRow dataRow = helper.DataSet.Tables[0].Rows[i - 1];
                    //Get Bytes From DataBase
                    byte[] imageBytes = (byte[])dataRow[8];
                    MemoryStream ms = new MemoryStream(imageBytes);

                    System.Drawing.Bitmap bmap = new System.Drawing.Bitmap(ms);
                    
                    IntPtr hBitmap = bmap.GetHbitmap();
                    Image MyImg = New Image();
                    //Convert Bitmap To Image
                    MyImg.Source = System.Windows.Interop.Imaging.CreateBitmapSourceFromHBitmap(hBitmap, IntPtr.Zero, Int32Rect.Empty, BitmapSizeOptions.FromEmptyOptions());
                   
    
                    mycanvas.Children.Clear();
                    RemoveLogicalChild(MyImg);
                    mycanvas.Children.Add(MyImg);

But At mycanvas.Children.Add(MyImg)I Get Error "Specified element is already the logical child of another element. Disconnect it first."

Can Anyone Tell Me How I Can Fix This Problem?

Regards

解决方案

Hi Try this

MemoryStream Ms = new MemoryStream();
System.Drawing.Bitmap ObjBitmap = null;
ObjBitmap = //Load your Image;
ObjBitmap.Save(Ms, System.Drawing.Imaging.ImageFormat.Bmp);
Ms.Position = 0;
BitmapImage ObjBitmapImage = new BitmapImage();
ObjBitmapImage.BeginInit();
ObjBitmapImage.StreamSource = Ms;
ObjBitmapImage.EndInit();
ImageControl.Source = ObjBitmapImage;
</pre>

Here Is My Codes I Get Image Byte Array From My DataBase And Convert It To Bitmap And When I Want Show It On Canvas I get This Error

Is There Other Way To I Convert Bitmap To Image And Show It In Canvas Box?

private void comboBox1_SelectionChanged(object sender,SelectionChangedEventArgs e)
        { 
            selected_table_name = comboBox1.SelectedItem.ToString();
            string connectionString = "Data Source=C:\\Gallery\\Appdb.sqlite";

            // Determin the DataAdapter = CommandText + Connection
            string commandText = @"SELECT * FROM " + selected_table_name + " ORDER BY ID";

            // Make a new object
            helper = new dBHelper(connectionString);

            // Load the data
            if (helper.Load(commandText, "") == true)
            {
                // Show the data in the datagridview
                dataGridViewImageList.ItemsSource = helper.DataSet.Tables[0].DefaultView;
                //System.Windows.Visibility.Visible
                dataGridViewImageList.Columns[8].Visibility = System.Windows.Visibility.Collapsed;
                dataGridViewImageList.Columns[6].Visibility = System.Windows.Visibility.Collapsed;
                Int32 i = 1;
                if (i > 0)
                {
                    DataRow dataRow = helper.DataSet.Tables[0].Rows[i - 1];
                    //Get Bytes From DataBase
                    byte[] imageBytes = (byte[])dataRow[8];
                    MemoryStream ms = new MemoryStream(imageBytes);

                    System.Drawing.Bitmap bmap = new System.Drawing.Bitmap(ms);
                    
                    IntPtr hBitmap = bmap.GetHbitmap();
                    //Convert Bitmap To Image
                    MyImg.Source = System.Windows.Interop.Imaging.CreateBitmapSourceFromHBitmap(hBitmap, IntPtr.Zero, Int32Rect.Empty, BitmapSizeOptions.FromEmptyOptions());
                   
    
                    mycanvas.Children.Clear();
                    RemoveLogicalChild(MyImg);
                    mycanvas.Children.Add(MyImg);
                    
                }
               
            }
       
        }

Regards

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