How can I bind a datatable to a datagrid without autogenerateColumns

Question

Hi

I have created a class with a datatable

public DataTable DatenTB = new DataTable();

    public void initDataTB()
    {

        DatenTB.Columns.Add("ID", typeof(string));
        DatenTB.Columns.Add("Name", typeof(string));

...
}

bind it to datagrid

InitializeComponent();


        DT.initDataTB();
        DT.loadDataTB();

        dGrid.DataContext = DT.DatenTB;

and it works ... with autogeneratedColums

Now I would like to use custom columns -
set autogenerated to false and it doesn't work - Column header appears but no data
didn't find the error - any help?

<Window.DataContext>
        <local:DatenTable/>
    </Window.DataContext>


 <DataGrid ItemsSource="{Binding DatenTB}" ...



 <DataGrid.Columns>
                <DataGridTextColumn Header="ID" Binding="{Binding ID}" />
                <DataGridTextColumn Header="Name" Binding="{Binding Name}" />
            </DataGrid.Columns>

Answer 1

You can have something like this in your viewmodel:

class MainVM  
{  
    public DataTable Entries { get; set; }  
    public MainVM() {  
        Entries = new DataTable() {  
            Columns = {  
                new DataColumn("DrHead", typeof(string)),  
                new DataColumn("CrHead", typeof(string)),  
                new DataColumn("DrAmount", typeof(int)),  
                new DataColumn("CrAmount", typeof(int)),  
            }  
        };  
        for (int i = 0; i < 5; i++)   
            Entries.Rows.Add("Dr", "Cr", 100, 200);  
    }  
}  

and these in xaml:

<Window x:Class="WPFTest.MainWindow"...>  
    <Window.DataContext>  
        <local:MainVM/>  
    </Window.DataContext>  
    <Grid>  
        <DataGrid ItemsSource="{Binding Entries}"  
                AutoGenerateColumns="False">  
            <DataGrid.Columns>  
                <DataGridTextColumn Header="Dr Head" Binding="{Binding DrHead}"/>  
                <DataGridTextColumn Header="Cr Head"  Binding="{Binding CrHead}"/>  
                <DataGridTextColumn Header="Dr Amount" Binding="{Binding DrAmount}"/>  
                <DataGridTextColumn Header="Cr Amount"  Binding="{Binding CrAmount}"/>  
            </DataGrid.Columns>  
        </DataGrid>  
    </Grid>  
</Window>  

and you'll get this:

No one uses this approach. Use List, ObservableCollection, etc. instead.

EDIT
---
With ObservableCollection/List, you simply do this:

class MainVM  
{  
    public ObservableCollection<Entry> Entries { get; set; }  
    public MainVM() {  
        Entries = new ObservableCollection<Entry>();  
        for (int i = 0; i < 5; i++) {  
            Entries.Add(new Entry() {  
                DrHead = "Dr",  
                CrHead = "Cr",  
                DrAmount = 100,  
                CrAmount = 200  
            });  
        }  
    }  
}  
class Entry  
{  
    public string DrHead { get; set; }  
    public string CrHead { get; set; }  
    public int DrAmount { get; set; }  
    public int CrAmount { get; set; }  
}  

Answer 2

Your first approach is the one I do - the second I tried before with celleditending and update observableCollection and so on

for my little App is seems easier to use datatable like in the old times and ...

I found the error ... I changed

<DataGrid ItemsSource="{Binding DatenTB}" 

to

<DataGrid ItemsSource="{Binding}" 

and it's working :)

Thanks for all your answers