Question

我正在寻找一种方法来了解如何以编程方式向数据网格添加显示图像的列。我一直在寻找如何找到解决方案很长一段时间没有成功。

我现在这样做的方式是这样的：

DataGridTemplateColumn col1 = new DataGridTemplateColumn();
col1.Header = "Betaald";
FrameworkElementFactory factory1 = new FrameworkElementFactory(typeof(System.Windows.Controls.Image));
Binding b1 = new Binding("Picture") { Mode = BindingMode.TwoWay };
factory1.SetBinding(System.Windows.Controls.Image.SourceProperty, b1);
DataTemplate cellTemplate1 = new DataTemplate();
cellTemplate1.VisualTree = factory1;
col1.CellTemplate = cellTemplate1;
dtgVerkoopsdocumenten.Columns.Add(col1);

这应创建一个我可以显示图像的列。我从数据库获得的所有数据，我以这样的列存储：

System.Windows.Controls.Image image = new System.Windows.Controls.Image(); //this is on top of my class

MySqlDataReader reader = cmd.ExecuteReader();
while (reader.Read())
{
    string naam = getKlant(reader.GetInt32(2));

    if (reader.GetBoolean(7) == false)
    {
        BitmapImage betalen = new BitmapImage(new Uri("/WpfApplication1;component/Images/false.png", UriKind.Relative));
        image.Source = betalen;
    }
    else
    {
        BitmapImage betalen = new BitmapImage(new Uri("/WpfApplication1;component/Images/true.png", UriKind.Relative));
        image.Source = betalen;
    }

    dtgVerkoopsdocumenten.Items.Add(new DataItem
    {
        ID = reader.GetInt32(1),
        klant = naam,
        netto = reader.GetDouble(3),
        btw = reader.GetDouble(4),
        bruto = reader.GetDouble(5),
        datum = reader.GetDateTime(6).ToString("dd-MM-yyyy"),
        soort2 = soort,
        Picture = image
        });
    }
    reader.Close();

DataItem是一个自己创建的类，我存储在所有绑定中：

//more code, but the one below is the one I'm talking about
public System.Windows.Controls.Image Picture { get; set; }

我现在得到的绝对没有。我没有收到任何错误。

所以我的问题是：如何将图像存储到数据网格中，而不必过多地使用xaml文件。

输出：

System.Windows.Data Error: 1 : Cannot create default converter to perform 'two-way' conversions between types 'System.Windows.Controls.Image' and 'System.Windows.Media.ImageSource'. Consider using Converter property of Binding. BindingExpression:Path=Picture; DataItem='DataItem' (HashCode=435249); target element is 'Image' (Name=''); target property is 'Source' (type 'ImageSource')
System.Windows.Data Error: 5 : Value produced by BindingExpression is not valid for target property.; Value='System.Windows.Controls.Image' BindingExpression:Path=Picture; DataItem='DataItem' (HashCode=435249); target element is 'Image' (Name=''); target property is 'Source' (type 'ImageSource')
System.Windows.Data Error: 1 : Cannot create default converter to perform 'two-way' conversions between types 'System.Windows.Controls.Image' and 'System.Windows.Media.ImageSource'. Consider using Converter property of Binding. BindingExpression:Path=Picture; DataItem='DataItem' (HashCode=45279885); target element is 'Image' (Name=''); target property is 'Source' (type 'ImageSource')
System.Windows.Data Error: 5 : Value produced by BindingExpression is not valid for target property.; Value='System.Windows.Controls.Image' BindingExpression:Path=Picture; DataItem='DataItem' (HashCode=45279885); target element is 'Image' (Name=''); target property is 'Source' (type 'ImageSource')

Answer 1

您应该使用SetBinding方法而不是SetValue，因为您要将绑定分配给属性，而不是为属性赋值。

自：

factory1.SetValue(System.Windows.Controls.Image.SourceProperty, b1);

要：

factory1.SetBinding(System.Windows.Controls.Image.SourceProperty, b1);

您的绑定声明也可以写成：

Binding b1 = new Binding("Picture") { Mode = BindingMode.TwoWay };

Datagrid图像列以编程方式添加wpf

1 个答案: