使用匿名类型集合填充 WPF 中的 DataGrid

Question

I'm populating datagrid with collection of anonymous types (I'm setting DataGrid's DataContext property). And there are no errors. And nothing dsiplayed in datagrid. I've tried to make the same with defined object collection, but again nothing is displayed. Please could you instruct me what to do.

Thanks!

EDIT 1

Ok. I tried to set ItemsSource property and it works. But I'm getting strange result..

EDIT 2

I don't know how but after 3d launch it now's working properly?

private void ShowABCResultsButtonOnClick(Object sender, RoutedEventArgs e)
{
    var anonArray = new List<NormalizedResult> 
    { 
        new NormalizedResult
        { 
            Key = 1,
            Title = "Колос", 
            Volume = 1322.01m,
            Weighted = 6.7840m,
            Result = 6.7840m,
            Group = "A"
        },
        new NormalizedResult
        { 
            Key = 2,
            Title = "Украинский Новый", 
            Volume = 1250.47m,
            Weighted = 6.4169m,
            Result = 13.2009m,
            Group = "A"
        },
        new NormalizedResult
        { 
            Key = 3,
            Title = "Ржано-Пшеничный", 
            Volume = 1202.1m,
            Weighted = 6.1687m,
            Result = 19.3695m,
            Group = "A"
        }
    };

    this.dataGrid2.ItemsSource = anonArray;
}

this is my code.

And again I've launched.. and it displayed properly only the third time?

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Answer 1

You likely need to do two things. The first, as @Tim suggested , is assign the query to the DataGrid.ItemsSource property.

myDataGrid.ItemsSource = from a in x
                         select new { Prop1 = a.A, Prop2 = a.B, ... };

The second bit will be to enable automatic column generation on your DataGrid :

 <DataGrid x:Name="myDataGrid" AutoGenerateColumns="True" />

Edit : I've recreated your picture using automatic column generation and anonymous types with a vanilla LINQ query. So you will need to be could use explicit columns to use or switch to a real type.

<DataGrid x:Name="myDataGrid"
          AutoGenerateColumns="False">
    <DataGrid.Columns>
        <DataGridTextColumn Header="Property 1"
                            Binding="{Binding Prop1}"/>
        <DataGridTextColumn Header="Property 2"
                            Binding="{Binding Prop2}"/>
    </DataGrid.Columns>
</DataGrid>

Edit 2 : You CAN use AutoGenerateColumns="True" just not with the bare IEnumerable<T> where T is an anonymous type. By adding ToList the problem goes away.

myDataGrid.ItemsSource = (from m in typeof(int).GetMethods()
                          select new
                          {
                              Name = m.Name,
                              ReturnType = m.ReturnType.FullName
                          }).ToList();

XAML then goes back to:

<DataGrid x:Name="myDataGrid"
          AutoGenerateColumns="True" />

Answer 2

Pretty sure you should be setting the DataGrid's ItemsSource instead.

Answer 3

please make sure you use the same properties name of your anonymous object when binding it in data Grid and make sure the collection contains items.