添加图像在C＃wpf项目中以编程方式执行DataGrid - 如何？

Question

I have a problem.

I want to write ALL things programically in C#, without VS Designer.

So, I'm creating an image and and DataGrid (and I'm adding it as a child of MainWindow Grid):

  Image img = new Image();
  Uri uri = new Uri(@"C:\d1.jpg");
  img.Source = new System.Windows.Media.Imaging.BitmapImage(uri);

  DataGrid dg = new DataGrid();
  grid1.Children.Add(dg);

Then I want to add 4 columns for example, 3 of text and one of image. So at first I need to create a DataTable and DataRow with sample data:

  DataTable dt = new DataTable();

  dt.Columns.Add("Column1");
  dt.Columns.Add("Column2");
  dt.Columns.Add("Column3");
  dt.Columns.Add("Column4", typeof(Image)); // type of image!

  DataRow dr = dt.NewRow();
  dr[0] = "aaa";
  dr[1] = "bbb";
  dr[2] = "ccc";
  dr[3] = img; // add a sample image

  dt.Rows.Add(dr);

Now I have a DataTable with 4 columns and 1 row of data.

Then all I need to do is to set ItemsSource of DataGrid like this:

dg.ItemsSource = dt.DefaultView;

What I'm doing wrong? Why on the final grid there is System.Windows.Controls.Image in a row instead of real image? Do I need to bind it or something?

All things I need to do programically, without designer.

How to display real image instead of that string?

Answer 1

Still don't know how to do it in 100% programically, but i figure it out.

The most important thing is that DataGrid (or GridView) doesn't support Image. Why? Don't ask me. So i changed image to BitmapImage and it works like a charm.

So there is my modifications:

        Uri uri = new Uri(@"C:\d1.jpg");
        BitmapImage bmp = new System.Windows.Media.Imaging.BitmapImage(uri);

        ...

        DataGrid dg = new DataGrid();
        dg.AutoGenerateColumns = false;

        DataGridTemplateColumn col1 = (DataGridTemplateColumn)this.FindResource("dgt");
        dg.Columns.Add(col1);

        DataGridTextColumn col2 = new DataGridTextColumn();
        col2.Header = "Column2";
        col2.Binding = new Binding("Column2");
        dg.Columns.Add(col2);

        ...

        DataTable dt = new DataTable();
        dt.Columns.Add("Column1", typeof(BitmapImage));
        dt.Columns.Add("Column2");

        DataRow dr = dt.NewRow();
        dr[0] = bmp;
        dr[1] = "test";
        dt.Rows.Add(dr);

        ...

        dg.ItemsSource = dt.DefaultView;
        grid1.Children.Add(dg);

But i needed to add Resources to XAML (don't know how to program it). So there is a code:

<Window.Resources>
    <DataGridTemplateColumn x:Key="dgt" Header="Column1" Width="SizeToCells">
        <DataGridTemplateColumn.CellTemplate>
            <DataTemplate>
                <Image Source="{Binding Column1}" />
            </DataTemplate>
        </DataGridTemplateColumn.CellTemplate>
    </DataGridTemplateColumn>
</Window.Resources>

And all is working FINE!

The same for GridView or ListView. Hope it helps someone.

Answer 2

here has a super simple example that helped me so much

http://www.c-sharpcorner.com/Forums/Thread/80586/displaying-images-in-datagrid-in-wpf-C-Sharp.aspx

I adapted the sample code for the MVVM

View

    <DataGrid x:Name="dgGrid" ItemsSource="{Binding collection}" AutoGenerateColumns="False">
        <DataGrid.Columns>
            <DataGridTemplateColumn Header="Image">
                <DataGridTemplateColumn.CellTemplate>
                    <DataTemplate>
                        <Image Height="25" Width="50" Source="{Binding path}" />
                    </DataTemplate>
                </DataGridTemplateColumn.CellTemplate>
            </DataGridTemplateColumn>
        </DataGrid.Columns>
        <DataGridTextColumn Header="Name" Binding="{Binding name}"/>
    </DataGrid>

Entity

public class File
{
    public string path{ get; set; }
    public string name{ get; set; }
}

ViewModel

var collection = new ObservableCollection<File>();
collection.Add(new File() { path=@"C:\Users\homeIcon.png", name="Home" });