DataGrid table values are displayed only when clicking the header of the table..

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Hi,
I'm adding some values in a DataGrid table, I can add but the values are displaying only when i click the header of DataGrid table.
I'm following MVVM, this problem arise only when i'm writing code in seperate ViewModal file instead code behind.

someone please give solution for this problem...

I have shared my code below.

C#

 <Label Content="Add Load Generator" Grid.Row="0"  Grid.Column="1"  FontFamily="Ebrima" FontSize="15" HorizontalAlignment="left" VerticalAlignment="bottom" ></Label>
                <TextBox Text="{Binding Path=TxtIpAddress}"  Grid.Row="0" Grid.Column="2" Width="220"  Height="25" HorizontalAlignment="left" VerticalAlignment="bottom"  />
<pre lang="xml"><Button Content="Add" Command="{Binding AddIp}"  Grid.Row="0" Grid.Column="1" FontFamily="Ebrima" FontSize="12" Width="60" Height="25"  HorizontalAlignment="right" VerticalAlignment="center"/>




<DataGrid ItemsSource="{Binding SystemInformation}" AutoGenerateColumns="false"     Grid.Row="0" Grid.Column="1" CanUserAddRows="False">
   <DataGrid.Columns>
   <DataGridTextColumn Binding="{Binding Sno}"  Header="S.No" MinWidth="50" />
   <DataGridTextColumn Binding="{Binding strIpAddr}" Header="System Name" MinWidth="240"/>
   <DataGridTextColumn Binding="{Binding strSystemName}" Header="IP Address" MinWidth="240" />
   <DataGridTextColumn Binding="{Binding strStatus}" Header="Status" MinWidth="140" />
   </DataGrid.Columns>
</DataGrid>
</pre>

C#

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Microsoft.Practices.Prism.Mvvm;

using LoadTest_LibraryFiles.Views;
using System.Windows;
using System.Windows.Input;
using Microsoft.Practices.Prism.Commands;
using System.Collections.ObjectModel;
using Microsoft.Win32;

//using Microsoft.Win32.OpenFileDialog;
using System.IO;
using Microsoft.Practices.Prism.Regions;
using Microsoft.Practices.Unity;
using System.Net;

namespace LoadTest_LibraryFiles.ViewModal
{

    public class UserBase_ViewModal : BindableBase
    {

 private int num = 1;
        ObservableCollection<HostSystemInformation> _HostSystemInformation = new ObservableCollection<HostSystemInformation>();
         public UserBase_ViewModal()
        {
           
            SystemInformation = new List<HostSystemInformation>();
            addIp = new DelegateCommand(AddSystemInformationInIpTable);
        }

 private String txtIpAddress;
        public String TxtIpAddress
        {
            get { return txtIpAddress; }
            set { SetProperty(ref txtIpAddress, value); }
        }


        private DelegateCommand addIp;
        public ICommand AddIp
        {
            get { return addIp; }
        }

        private List<HostSystemInformation> systemInformation;
        public List<HostSystemInformation> SystemInformation
        {
            get { return systemInformation; }
            set { SetProperty(ref systemInformation, value); }
        }



   private void AddSystemInformationInIpTable()
        {
            try
            {
              
                #region Add IP Address in IP Table

                systemInformation.Add(new HostSystemInformation
                {
                    Sno = num++,
                    strIpAddr = txtIpAddress,
                    strSystemName = hostname,
                    strStatus = "connected"

                });
                OnPropertyChanged(() => SystemInformation);
                
                #endregion


            }
            catch (System.ArgumentException) { MessageBox.Show("Enter the IP Address"); }
            catch (System.Net.Sockets.SocketException) { MessageBox.Show("Host not connected / No such host"); }
        }
}

 public class HostSystemInformation
    {
        public int Sno { get; set; }
        public string strIpAddr { get; set; }
        public string strSystemName { get; set; }
        public string strStatus { get; set; }
    }
         
}

Thanks in advance....
R.Karthik

Posted 8-Nov-14 0:15am

Karthik Ravi

Updated 8-Nov-14 0:19am

v4

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Tomas Takac · Accepted Answer · 2014-11-09T03:12:00

You should use ObservableCollection instead of List. Declare SystemInformation as:

C#

public ObservableCollection<HostSystemInformation> SystemInformation { get; private set; }

Then initialize it in constructor:

C#

SystemInformation = new ObservableCollection<HostSystemInformation>();

Finally in AddSystemInformationInIpTable:

C#

SystemInformation.Add(new HostSystemInformation
{
    Sno = num++,
    strIpAddr = txtIpAddress,
    strSystemName = hostname,
    strStatus = "connected"
 
});
// no need to call property changed explictly
// OnPropertyChanged(() => SystemInformation);

You have already declared _HostSystemInformation as ObservableCollection but it's not used anywhere. This is how you should expose collections that change.