Datagrid and Databinding

11-03-2009 9:41 AM |

Hi,

     i've a class named Employee which has two properties Name and Age.I've created a list of employees and set as the ItemsSource and added the below columns to the datagrid.<data:DataGridTextColumn Header="Name" Binding="{Binding Name}"/>

<data:DataGridTextColumn Header="Age" Binding="{Binding Age}"/>

But when i try to edit the cell ,the source gets the latest values which is the oppsoite behaviour of oneway mode.Guess,OneWay(from source to target ) is the default mode in databinding .Does silverlight has OneWayToSource Binding Mode ?

Re: Datagrid and Databinding

11-03-2009 10:06 AM |

The Mode on the Binding is set to OneWay indicating that the Name will come from the Binding Source (your Employee object) to be bound to the DataGridTextColumn, but changes made in the UI will not be sent back to the Binding Source.

Re: Datagrid and Databinding

11-03-2009 10:29 AM |

yeah,i too assumed it in the same way as you mentioned .But the datagrid behaves in a peculiar way .I think ,by default it uses the two way mode .

I tried the same  scenario with textbox and it works perfect.Not sure where it goes wrong ,when i try it with the datagrid.

Re: Datagrid and Databinding

11-03-2009 11:17 AM |

You need to add Mode=TwoWay on your binding because DataGrid column bindings are OneWay by default.

Re: Datagrid and Databinding

11-03-2009 11:16 PM |

Thanks yifung.

Is this the expected behaviour in Datagrid or is it a bug ?

Re: Re: Datagrid and Databinding

11-04-2009 5:42 AM |

Looks like its expected behaviour:

http://msdn.microsoft.com/en-us/library/system.windows.controls.datagrid(VS.95).aspx