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Sort object using parameter for property name

Posted on 2013-01-24
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Last Modified: 2013-01-24
This seems to work it sorts my list of ProjectActions by DueDate

actionList.Sort(delegate(ProjectAction al1, ProjectAction al2) { return al1.DueDate.CompareTo(al2.DueDate); });

I would like to pass in the property to sort by as a parameter

string SortBy = "DueDate"

something like this.
al1(SortBy).compareto al2(SortBy)

Is it possible to do this
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Question by:Eamon
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2 Comments
 
LVL 42

Expert Comment

by:sedgwick
ID: 38813824
you don't need to pass the property as string, use OrderBy:

actionList.OrderBy(n=>n.DueDate);

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you can also sort by multiple properties, for instance:

actionList.OrderBy(n => n.DueDate).ThenBy(n =>n.Property2).ThenBy(n => n.Property3);

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LVL 29

Accepted Solution

by:
Göran Andersson earned 500 total points
ID: 38814051
It would be possible, but very complicated because you would need to use reflection to get the properties, and still have different code for different data types.

Create a delegate depending on the parameter name. Example:

Func<ProjectAction, ProjectAction, bool> compare;
switch (SortBy) {
  case "Name": compare = (x, y) => x.Name.CompareTo(y.Name); break;
  case "DueDate": compare = (x, y) => x.DueDate.CompareTo(y.DueDate); break;
  default: throw new NotImplementedException();
}

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Then sort the list using the delegate:

actionList.Sort(compare);

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