问题
I have a problem binding data to a WPF DataGrid using Python.NET
The code is shown below, and I've tried three different approaches to binding data - each fails and the error message is included as a comment in the code below
If I do not attempt to add data, the datagarid displays correctly with headers. But I'm unable to populate the grid with any data.
Any help will be gratefully received!!!
Doug
import clr
#.NET references
import System
import System.Windows.Controls as WPFControls
import System.Windows.Data as WPFBindings
def getCustomToolPropertyContent():
#Create a Grid
my_Grid = WPFControls.Grid()
#Add 1 Row and One Column
my_Grid.RowDefinitions.Add(WPFControls.RowDefinition())
my_Grid.ColumnDefinitions.Add(WPFControls.ColumnDefinition())
# Create a DataGrid
myDataGrid = WPFControls.DataGrid()
#Create three columns
column_1 = WPFControls.DataGridTextColumn()
column_1.Header = "ID"
column_1.Binding = WPFBindings.Binding("id")
column_2 = WPFControls.DataGridTextColumn()
column_2.Header = "Title"
column_2.Binding = WPFBindings.Binding("title")
column_3 = WPFControls.DataGridTextColumn()
column_3.Header = "Content"
column_3.Binding = WPFBindings.Binding("content")
#Add the three columns to the datagrid
myDataGrid.Columns.Add(column_1)
myDataGrid.Columns.Add(column_2)
myDataGrid.Columns.Add(column_3)
# Data table approach....
# Fails with
# AttributeError : DataTable
#Create a DataTable
data_table = WPFBindings.DataTable("MyDataTable")
data_table.Columns.Add("id")
data_table.Columns.Add("title")
data_table.Columns.Add("content")
#Add data
data_table.Rows.Add("Andre", "Piratas", "1973")
data_table.Rows.Add("Andres", "Piratass", "1973s")
#DataTable to DataGrid
myDataGrid.DataContext = data_table.DefaultView
# Item Source Approach
# Fails with
# TypeError: 'list' value cannot be converted to System.Collections.IEnumerable
# items = []
# items.append(Student(id="1", title="Piratas", content="1973"))
# items.append(Student(id="2", title="XXXX", content="1974"))
# myDataGrid.ItemsSource = items
# Items.Add approach
# Fails with
# TypeError: No method matches given arguments
# myDataGrid.Items.Add(Student(id="1", title="Piratas", content="1973"))
# Position the DataGrid in the first row, column of the Grid
WPFControls.Grid.SetRow(myDataGrid, 0)
WPFControls.Grid.SetColumn(myDataGrid, 0)
#Add the DataGrid to the Grid
my_Grid.Children.Add(myDataGrid)
# Return the Grid
return my_Grid
回答1:
I don't see you creating data_Table instance.
DataTable data_table = CreateDataTable();
Plus try this !
myDataGrid.ItemsSource = data_table.DefaultView;
and in XAML
<DataGrid Name="myDataGrid" ItemsSource="{Binding}">
回答2:
OK,
I got it - I had the wrong import for the DataTable. Changed
"import System.Windows.Data as WPFBindings"
to
"import System.Data as WPFData"
Then took the advice of Hamas and changed,
"myDataGrid.DataContext = data_table.DefaultView"
to
myDataGrid.ItemsSource= data_table.DefaultView
Thanks Hammas!!
回答3:
For completeness, here is the working code. Note that by using the DataTable I was able to remove all of the manual column, header and Binding setup
import clr
#.NET references
import System.Windows.Controls as WPFControls
import System.Data as WPFData
def getCustomToolPropertyContent():
#Create a Grid
my_Grid = WPFControls.Grid()
#Add 1 Row and One Column
my_Grid.RowDefinitions.Add(WPFControls.RowDefinition())
my_Grid.ColumnDefinitions.Add(WPFControls.ColumnDefinition())
# Create a DataGrid
myDataGrid = WPFControls.DataGrid()
# Data table approach....
#Create a DataTable
data_table = WPFData.DataTable("MyDataTable")
data_table.Columns.Add("ID")
data_table.Columns.Add("Title")
data_table.Columns.Add("Content")
#Add data
data_table.Rows.Add("Andre", "Piratas", "1973")
data_table.Rows.Add("Andres", "Piratass", "1973s")
myDataGrid.ItemsSource = data_table.DefaultView
# Position the DataGrid in the first row, column of the Grid
WPFControls.Grid.SetRow(myDataGrid, 0)
WPFControls.Grid.SetColumn(myDataGrid, 0)
#Add the DataGrid to the Grid
my_Grid.Children.Add(myDataGrid)
# Return the Grid
return my_Grid
来源:https://stackoverflow.com/questions/53983209/cannot-populate-a-wpf-datagrid-using-python