programmatically add column rows to WPF Datagrid

Question

I m new to WPF  I just want to know how should we add columns and rows programmatically to a DataGrid in WPF  The way we used to do it in windows forms  create table columns and rows  and bind it to DataGrid    I believe WPF DataGrid is bit different the one used in ASP net and Windows form  correct me if I am wrong    I have No  of rows and columns which I need to draw in DataGrid so that user can edit the data in the cells

User · Answer

try this   it works 100      add columns and rows programatically   you need to create item class at first    public class Item                       public int Num   get  set                public string Start   get  set                public string Finich   get  set                       private void generate columns                         DataGridTextColumn c1   new DataGridTextColumn                c1 Header    Num               c1 Binding   new Binding  Num                c1 Width   110              dataGrid1 Columns Add c1               DataGridTextColumn c2   new DataGridTextColumn                c2 Header    Start               c2 Width   110              c2 Binding   new Binding  Start                dataGrid1 Columns Add c2               DataGridTextColumn c3   new DataGridTextColumn                c3 Header    Finich               c3 Width   110              c3 Binding   new Binding  Finich                dataGrid1 Columns Add c3                dataGrid1 Items Add new Item     Num   1  Start    2012  8  15   Finich    2012  9  15                  dataGrid1 Items Add new Item     Num   2  Start    2012  12  15   Finich    2013  2  1                  dataGrid1 Items Add new Item     Num   3  Start    2012  8  1   Finich    2012  11  15

User · Answer

I had the same problem  Adding new rows to WPF DataGrid requires a trick  DataGrid relies on property fields of an item object  ExpandoObject enables to add new properties dynamically  The code below explains how to do it      using System Dynamic   DataGrid dataGrid   string   labels   new string      Column 0    Column 1    Column 2      foreach  string label in labels        DataGridTextColumn column   new DataGridTextColumn        column Header   label      column Binding   new Binding label Replace                  dataGrid Columns Add column      int   values   new int     0  1  2     dynamic row   new ExpandoObject     for  int i   0  i  lt  labels Length  i          IDictionary lt String  Object gt  row  labels i  Replace              values i    dataGrid Items Add row       edit   Note that this is not the way how the component should be used  however  it simplifies a lot if you have only programmatically generated data  eg  in my case  a sequence of features and neural network output

User · Answer

If you already have the databinding in place John Myczek answer is complete   If not you have at least 2 options I know of if you want to specify the source of your data   However I am not sure whether or not this is in line with most guidelines  like MVVM        Then you just bind to Users collections and columns are autogenerated as you speficy them  Strings passed to property descriptors are names for column headers  At runtime you can add more PropertyDescriptors to  Users  add another column to the grid

User · Answer

If you already have the databinding in place John Myczek answer is complete  If not you have at least 2 options I know of if you want to specify the source of your data    However I am not sure whether or not this is in line with most guidelines  like MVVM   option 1  like JohnB said  But I think you should use your own defined collection instead of a weakly typed DataTable  no offense  but you can t tell from the code what each column represents   xaml cs  DataContext   myCollection     myCollection is a  ICollection lt YourType gt   preferably  ObservableCollection lt YourType gt    - option 2  Declare the name of the Datagrid in xaml           lt WpfToolkit DataGrid Name dataGrid  gt    in xaml cs  CollectionView myCollectionView           CollectionView CollectionViewSource GetDefaultView yourCollection   dataGrid ItemsSource   myCollectionView    If your type has a property FirstName defined  you can then do what John Myczek pointed out   DataGridTextColumn textColumn   new DataGridTextColumn     dataColumn Header    First Name    dataColumn Binding   new Binding  FirstName     dataGrid Columns Add textColumn      This obviously doesn t work if you don t know properties you will need to show in your dataGrid  but if that is the case you will have more problems to deal with  and I believe that s out of scope here

User · Answer

I found a solution that adds columns at runtime  and binds to a DataTable    How do I bind a WPF DataGrid to a variable number of columns    Unfortunately  with 47 columns defined this way  it doesn t bind to the data fast enough for me   Any suggestions   xaml   lt DataGrid   Name  dataGrid    AutoGenerateColumns  False    ItemsSource   Binding   gt   lt  DataGrid gt    xaml cs     using System Windows Data   if  table    null     table is a DataTable     foreach  DataColumn col in table Columns          dataGrid Columns Add        new DataGridTextColumn                 Header   col ColumnName          Binding   new Binding string Format    0     col ColumnName                    dataGrid DataContext   table

User · Answer

To Bind the DataTable into the DataGridTextColumn in CodeBehind xaml   lt DataGrid   Name  TrkDataGrid    AutoGenerateColumns  False    ItemsSource   Binding   gt   lt  DataGrid gt    xaml cs       foreach  DataColumn col in dt Columns          TrkDataGrid Columns Add        new DataGridTextColumn                 Header   col ColumnName          Binding   new Binding string Format    0     col ColumnName                    TrkDataGrid ItemsSource  dt DefaultView

User · Answer

edit  sorry  I no longer have the code mentioned below  It was a neat solution  although complex     I posted a sample project describing how to use PropertyDescriptor and lambda delegates with dynamic ObservableCollection and DynamicObject to populate a grid with strongly-typed column definitions   Columns can be added removed at runtime dynamically  If your data is not a object with known type  you could create a data structure that would enable access by any number of columns and specify a PropertyDescriptor for each  column    For example   IList lt string gt  ColumnNames   get  set      dict key is column name  dict value is value Dictionary lt string  string gt  Rows   get  set      You can define columns this way   var descriptors  new List lt PropertyDescriptor gt       retrieve column name from preprepared list or retrieve from one of the items in dictionary foreach var columnName in ColumnNames      descriptors Add new DynamicPropertyDescriptor lt Dictionary  string gt  ColumnName  x   gt  x columnName    MyItemsCollection   new DynamicDataGridSource Rows  descriptors     Or even better  in case of some real objects  public class User        public string FirstName   get  set        public string LastName  get  set                You can specify columns strongly typed  related to your data model    var propertyDescriptors   new List lt PropertyDescriptor gt        new DynamicPropertyDescriptor lt User  string gt   First name   x   gt  x FirstName        new DynamicPropertyDescriptor lt User  string gt   Last name   x   gt  x LastName               var users   retrieve some users  Users   new DynamicDataGridSource lt User gt  users  propertyDescriptors  PropertyChangedListeningMode Handler     Then you just bind to Users collections and columns are autogenerated as you speficy them  Strings passed to property descriptors are names for column headers  At runtime you can add more PropertyDescriptors to  Users  add another column to the grid

User · Answer

To programatically add a row   DataGrid Items Add new DataItem       To programatically add a column       DataGridTextColumn textColumn   new DataGridTextColumn     textColumn Header    First Name    textColumn Binding   new Binding  FirstName     dataGrid Columns Add textColumn      Check out this post on the WPF DataGrid discussion board for more information

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