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WPF: Read SelectedItem from DataGrid with Dynamic As Anonymous Type

31.12.2018 (👁664)

 How to evaluate an Coloumn Value in a WPF DataGrid.SelectedItem?

 

Task:

I want to read out the value of a column from a data Grid in WPF. Unfortunately, the evaluation of DataGrid.SelectedItem results in a line from the Type <Anonymous Type> and if you convert the Row into DataGrid.SelectedItem in DataRowView then as a result is always zero returned or the conversion of Anonymus Type into DataRowView is Not possible

 

Problem conversion SelectedItem

 

DataRowView row = ctlDataGrid.SelectedItem as DataRowView;

->returns null

 

 

Solution:

Super Solution with C # dynamic.

You can use the time time data type dynamic. This dynamic data type can be used freely for runtime like var variant and you can simply query the columns or fields like a property.

So simply convert SelectedItem into dynamic and then dynamic the column as. Evaluate column. This is easier than forming an array or ruse of the Type String.

 

dynamic row = ctlDataGrid.SelectedItem;

sName = row.Nachname;

 

 

 

 

Excerpt: Debug

The Debug extract shows that in the DataGrid SelectedItem an array of strings results in runtime.

The SelectedItem is from Type <Anonymous Type>

 

Name

 

Value

Type

ctlDataGrid.SelectedItem

 

{ Nachname = "Butzer", Maschine = "Drehbank 1", Schichtgruppe = "Schicht 2" }

<Anonymous Type>

 

 

Code example on evaluations des ausgewählten Elements in einem WPF DataGrid Selected Item

 

Private void CtlDataGrid_SelectionChanged(object sender, SelectionChangedEventArgs e)

        {

            //----------< CtlDataGrid_SelectionChanged() >----------

            string sName = "";

            //--< get_DataGrid_SelectedItem >--

            //* get DataGrid.SelectedItem as <Anonymus Type > into c#.dynamic

            //* get Value of dynamic variable simply bei get as named property  like dynamic_value.Field

            if (ctlDataGrid.SelectedItem != null)

            {

                dynamic row = ctlDataGrid.SelectedItem;

                sName = row.Nachname;

            }

            //--</ get_DataGrid_SelectedItem >--

 

            //< insert button >

            Button btn = new Button();

            btn.Background = new SolidColorBrush(Colors.Red);

            btn.Content = sName;

            //#todo: Event drag drop einfügen

 

            _srcPanel.Child = btn;

            //</ insert button >

 

            this.Close();

            //----------</ CtlDataGrid_SelectionChanged() >----------

        }