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Need help in understanding how to sort BindingList

Posted on 2012-03-19
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Last Modified: 2012-03-19
I'm am trying to understand how I can sort a binding list.  I used a reverse function that doesn't work.  I'm surprised that c# doesn't have a method already built to sort a list.  Here is how my class looks:
public class FieldsToMonitor
{
    public int ID { get; set; }
    public DateTime ChangedDate { get; set; }
}

Public CreateList
{
  static BindingList<FieldsToMonitor> FieldsToMonitorList = new BindingList<FieldsToMonitor>();
  ... populate list 
  FieldsToMonitorList.Reverse<FieldsToMonitor>();
}

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the FieldsToMonitorList.Reverse doesn't seem to work.  I'm probably using it wrong.  All I want to do is sort ChangedDate descending.  Thanks for the assist.

Nick
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Question by:countyprob
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Accepted Solution

by:
Mez4343 earned 500 total points
ID: 37739840
BindingList support an OrderBy() function to sort with. This  

FieldsToMonitorList.OrderBy(x => x.ChangedDate);  //acending order

FieldsToMonitorList.OrderByDescending(x => x.ChangedDate);  //descending order
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Assisted Solution

by:Mez4343
Mez4343 earned 500 total points
ID: 37739856
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Author Comment

by:countyprob
ID: 37739948
I tried

FieldsToMonitorList.OrderByDescending(x => x.ChangedDate);

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but it's not ordering the dates.  I even tried

var OrderedFieldsToMonitorList = FieldsToMonitorList.OrderByDescending(x => x.ChangedDate);

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but OrderedFieldsToMonitorList shows the dates ascending also.  

thanks
nick
0
 
LVL 1

Author Comment

by:countyprob
ID: 37740035
never mind, tried it this way and it work

foreach (var FieldsToMonitor in FieldsToMonitorList.OrderByDescending(x => x.ChangedDate))

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thanks for the help
0
 
LVL 10

Expert Comment

by:Mez4343
ID: 37740072
sry for late reply.. Here is a code specific way to use OrderBy()'s in a basic windowsForm app.

public class FieldsToMonitor
        {
            public int ID { get; set; }
            public DateTime ChangedDate { get; set; }
        }
        public Form1()
        {
            InitializeComponent();
            _fieldsToMonitorList = CreateList;
            var sortedList = _fieldsToMonitorList.OrderByDescending(x => x.ChangedDate);
            listBox1.DataSource = new BindingSource(sortedList,null);
            listBox1.ValueMember = "ChangedDate";
        }
       
        public BindingList<FieldsToMonitor> CreateList    
        {
          get
          {
              BindingList<FieldsToMonitor> FieldsToMonitorList = new BindingList<FieldsToMonitor>();
              FieldsToMonitorList.Add(new FieldsToMonitor() { ID = 1, ChangedDate = DateTime.Now });
              FieldsToMonitorList.Add(new FieldsToMonitor() { ID = 2, ChangedDate = DateTime.Now.AddMonths(1) });
              FieldsToMonitorList.Add(new FieldsToMonitor() { ID = 3, ChangedDate = DateTime.Now.AddMonths(2) });
              return FieldsToMonitorList;
          }          
        }
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