从DataGrid获取SelectedItem值

Question

I have a DataGrid in my WPF application as below.

<DataGrid Name="stDataGrid" AutoGenerateColumns="False">
    <DataGrid.Columns>
        <DataGridTemplateColumn Header="Edit" CanUserResize="False" Width="SizeToHeader">
            <DataGridTemplateColumn.CellTemplate>
                <DataTemplate>
                    <Button" Click="btnEdit_Click">
                        <StackPanel>
                            <Image Source="images/edit.png"/>
                        </StackPanel>
                    </Button>
                </DataTemplate>
            </DataGridTemplateColumn.CellTemplate>
        </DataGridTemplateColumn>
        <DataGridTextColumn Binding="{Binding Path=Name}" Header="Name" IsReadOnly="True"></DataGridTextColumn>
        <DataGridTextColumn Binding="{Binding Path=Age}" Header="Age" IsReadOnly="True"></DataGridTextColumn>
        <DataGridTextColumn Binding="{Binding Path=Sex}" Header="Sex" IsReadOnly="True"></DataGridTextColumn>
    </DataGrid.Columns>
</DataGrid>

Binding data into DataGrid like this.

using (var context = new CLASS_DBEntities())
{
var query = from s in context.STUDENT
            orderby s.STUDENT_NAME
            select new {s.STUDENT_ID, Name = s.STUDENT_NAME, Age = s.STUDENT_AGE, 
                        Sex = s.STUDENT_SEX};

stDataGrid.ItemsSource = query.ToList();
}

When user click Button in DataGrid, I need to get STUDENT_ID value. How can i do this ?

Answer 1

Set an attached property of the same type as student_id on your button and bind it relativly to the datacontext.student_id of the DataGridRow control which should be the parent to all yours cells in a row.

Once you enter btnEdit_Click method just read out the value from your attached property.

Answer 2

Finally found answer by myself.

in btnEdit_Click method,

dynamic customerRow = stDataGrid.SelectedItem;
MessageBox.Show(customerRow.STUDENT_ID+"");