c# - Designing my models for binding to DataGrid items and headers -

i'm trying obtain datagrid in view data in model. think must reorganize data in viewmodel display them in view. i'm new in mvvm , i'd understand 2 points of question:

1. taking in mind not know neither number of rows, neither number of columns, kind of data holder should use? observablecollection<>? more in detail each row have item, , each column have aspect of item.
2. how can set headers of datagrid?

the rows should apperar 1,2,3... columns should have specific names.

this try:

mainwindow.xaml:

<datagrid autogeneratecolumns="false" itemssource="{binding mytable}" /> 

mainwindowviewmodel.cs:

private observablecollection<list<myitem>> _mytable; public class myitem {     public myitem(string value)     {         value= value;     }     public string value{ get; set; } } public observablecollection<list<myitem>> mytable {         {         return _mytable;     }      set     {         _mytable = value;         raisepropertychanged("mytable");     } } 

the execute of comand is:

private void displaydatatableexecute()     {         mytable = new observablecollection<list<myitem>>();         var temp = new list<myitem>();         temp.add(new myitem("one"));         temp.add(new myitem("two"));         temp.add(new myitem("three"));         mytable.add(temp);         temp = new list<myitem>();         temp.add(new myitem("one"));         temp.add(new myitem("two"));         temp.add(new myitem("three"));         mytable.add(temp);     } 

when use autogeneratecolumns="false" see rows (the correct number empty) when use autogeneratecolumns="true" see properties of table (capacity , count).

i need help, because can't find solution.

there 2 main issues here:

first: can't use autogeneratecolumns = "false" without setting columns. you'll need map these through yourself, ie:

<datagrid autogeneratecolumns="false" itemssource="{binding mytable}" >     <datagrid.columns>         <datagridtextcolumn header="value"  binding="{binding value}"/>     </datagrid.columns> </datagrid> 

note can set autogeneratecolumns="true" instead, give 1 column per property in class.

second: need make class (class myitem) implement inotifypropertychanged if want have changes made in code reflected in ui.