//假设变动的属性是“IsChanged”,

List<DataChangedViewModel> lstDataChanged = new List<DataChangedViewModel>();

//赋值省略

 this.dataGrid.ItemsSource = lstDataChanged;

 private void dataGrid_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            DataChangedViewModel mvm = dataGrid.SelectedItem as DataChangedViewModel;
            if (mvm.IsChanged.Equals("False"))
            {
                foreach (DataChangedViewModel item in dataGrid.Items)
                {
                    if (item.Id == mvm.Id)
                    {
                        item.IsChanged= "True";
                    }
                }
            }
        }

public class DataChangedViewModel
        : INotifyPropertyChanged

//实体类需要实现INotifyPropertyChanged 接口
    {

        public event PropertyChangedEventHandler PropertyChanged;

        private string isChanged;

　　   public int RowNum { get; set; }
        public long Id { get; set; }
        public string No { get; set; }
        public string TypeName { get; set; }
        public string StatusName { get; set; }

        //变动的属性

　　  public string IsChanged
        {
            get
            {
                return isChanged;
            }
            set
            {
                isChanged= value;
                NotifyPropertyChanged("isChanged");
            }
        }

        public void NotifyPropertyChanged(string propertyName)
        {
            if (PropertyChanged != null)
            {
                PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
            }
        }

    }

WPF DataGrid双向绑定，数据源数据更改 刷新列表（无需重新加载数据源~~~）