WPF Learning Series MVVM design pattern One

From today onwards, we will be familiar with the example step by part, understand and apply the MVVM design pattern. So first look at the project layering of MVVM.   created 3 folders in the project, namely Model,view,viewmodel  . Eventually formed a standardized layering of M-V-VM design patterns.  model layer as the name implies "model", first we add the Student.cs type class in the model layer.  public class Student     {       public int StudentID {get; set;}     &NB Sp  public string Studentname {get; set;}        public double studentscore {get; set;}   & nbsp Then, in students, you get a collection of generic types student.  public class Students     {       public list<student> Student;     & nbsp  public list<student> setstudent ()        {           studen t = new list<student> ()            {               new Student{studentid = 1,studentname= "A", Studentscore = 90.5},               &NB Sp;new Student{studentid = 2,studentname= "B ", Studentscore = 98.6},                new Student{studentid = 3,studentname=" C ", Studentscore = 83.2},                new Student{studentid = 4,studentname= "D", Stu Dentscore = 71.5},            };            return student;        }    } such a simple data model is done. Next completes the ViewModel, obtains in the ViewModel the model the collection, certainly in the ViewModel also may do the more operation.  public list<student> allstudents {get; set;}        public STUDENTVM ()     &NB Sp  {           allstudents = new Students (). Setstudent ();       &NBSP;} then complete the view layer and add a user control Studenview.xaml in the view layer. Binding to ViewModel is implemented in view itemssource= "{Binding path=allstudents}"    <grid background= "Orange" >         <datagrid x:name= "Dgview" background= "Transparent"  autogeneratecolumns= "FalSe "itemssource=" {Binding path=allstudents} >             <DataGrid.Columns> & nbsp               <datagridtextcolumn width= "header=" number "binding=" {Binding path=stu Dentid} "isreadonly=" True "></DataGridTextColumn>                 < Datagridtextcolumn width= "header=" name "binding=" {Binding path=studentname} "isreadonly=" True "></ datagridtextcolumn>                 <datagridtextcolumn width= "header=" Score "binding=" {Binding path=studentscore} "isreadonly=" True "></DataGridTextColumn>             </DataGrid.Columns>         </DataGrid>     </Grid> most Add view to  mainwindow.xaml above <window x:class= "Mvvmtest.mainwindow"         xmlns= "/http/ Schemas.microsoft.com/winfx/2006/xaml/presentation "  &NBSp     xmlns:x= "Http://schemas.microsoft.com/winfx/2006/xaml"         xmlns:view= " Clr-namespace:mvvmtest.view "        xmlns:viewmodel=" Clr-namespace:mvvmtest.viewmodel "        title= "MVVM combat One" height= "width=" windowstartuplocation= "Centerscreen" >     <Window.Resources>         &LT;VIEWMODEL:STUDENTVM  x:key= "VM" ></viewmodel: studentvm>     </Window.Resources>      <grid datacontext= "{StaticResource vm}" >         <view:studentview margin= "50,50" ></view:StudentView>     </ Grid> </Window> so the first simple MVVM instance is done.