private static bool GetEnumValue <TEnum>(ITreeDataElement element, ref TEnum value) where TEnum : struct
{
string name = element.Value;
try
{
value = (TEnum)Enum.Parse(typeof(TEnum), element.Value);
return(true);
}
catch (ArgumentNullException)
{
if (!typeof(TEnum).IsEnum)
{
throw new Exception("Error parsing element \"" + element + "\" at " + element.DataOrigin + ", The " + typeof(TEnum).Name + " type is not an enum type.");
}
else if (name.Trim() == "")
{
throw new Exception("Error parsing element \"" + element.Name + "\" at " + element.DataOrigin + ". Element has no value.");
}
else
{
throw new Exception("Error parsing element \"" + element.Name + "\" at " + element.DataOrigin + ". Unexpected enum value: " + name);
}
}
catch (ArgumentException)
{
throw new Exception("Error parsing element \"" + element.Name + "\" at " + element.DataOrigin + ". Unexpected enum value: " + name);
}
}
public static void Dump(this ITreeDataElement element, System.IO.TextWriter writer)
{
string indent = String.Concat(Enumerable.Repeat("| ", element.Level()));
if (element.ElementCount == 0)
{
if (element.HasValue)
{
writer.WriteLine(indent + element.Name + " = " + element.Value);
}
else
{
writer.WriteLine(indent + element.Name + " (empty)");
}
}
else
{
if (element.HasValue)
{
writer.WriteLine(indent + element.Name + " = " + element.Value);
}
else
{
writer.WriteLine(indent + element.Name + " (" + element.ElementCount.ToString() + " sub entries)");
}
foreach (var sub in element.SubElements)
{
sub.Dump(writer);
}
}
}
public void ListIndexing()
{
var list = new List <int>();
Expression <Func <int> > expression = () => list[0];
ITreeDataElement treeElement = expression.CreateDataTree(null);
}
public void GetLinqExpressionInExpressionTree()
{
List <long> array = new List <long>();
Expression <Func <long> > expression = () => array.Where(v => v > 10L).FirstOrDefault();
ITreeDataElement treeElement = expression.CreateDataTree(null);
}
public static ITreeDataElement GetElement(this ITreeDataElement element, string subElement, StringComparison comparisonType = StringComparison.InvariantCulture)
{
if (element.ElementCount > 0)
{
return(element.SubElements.FirstOrDefault(e => String.Equals(e.Name, subElement, comparisonType)));
}
throw new Exception("Element not found.");
}
public static bool HasElement(this ITreeDataElement element, string subElement, StringComparison comparisonType = StringComparison.InvariantCulture)
{
if (element.ElementCount > 0)
{
return(element.SubElements.FirstOrDefault(e => String.Equals(e.Name, subElement, comparisonType)) != null);
}
return(false);
}
public static IEnumerable <ITreeDataElement> LisSBPecificElements(this ITreeDataElement element, params string[] names)
{
foreach (var sub in element.SubElements)
{
if (names.Contains(sub.Name))
{
yield return(sub);
}
}
}
public static int Level(this ITreeDataElement element)
{
if (element.Parent != null)
{
return(element.Parent.Level() + 1);
}
else
{
return(0);
}
}
public static bool TryGetLastValue <TEnum>(this ITreeDataElement element, string subElement, ref TEnum value) where TEnum : struct
{
if (element.ElementCount > 0)
{
var sub = element.SubElements.LastOrDefault(e => String.Equals(e.Name, subElement, StringComparison.InvariantCulture));
if (sub != null && sub.HasValue)
{
return(GetEnumValue <TEnum>(sub, ref value));
}
}
return(false);
}
public static bool TryGetValue(this ITreeDataElement element, string subElement, ref string value)
{
if (element.ElementCount > 0)
{
var sub = element.SubElements.FirstOrDefault(e => String.Equals(e.Name, subElement, StringComparison.InvariantCulture));
if (sub != null && sub.HasValue)
{
value = sub.Value;
return(true);
}
}
return(false);
}
public static bool TryGetValue(this ITreeDataElement element, string subElement, ref int value)
{
if (element.ElementCount > 0)
{
var sub = element.SubElements.FirstOrDefault(e => String.Equals(e.Name, subElement, StringComparison.InvariantCulture));
if (sub != null && sub.HasValue)
{
string s = sub.Value;
if (!Int32.TryParse(s, out value))
{
throw new Exception("Error parsing element \"" + subElement + "\" at " + sub.DataOrigin + " as an integer value. Value: " + s);
}
return(true);
}
}
return(false);
}
TreeViewItem GetLeaf(ITreeDataElement element)
{
TreeViewItem item = new TreeViewItem()
{
Header = element.Name
};
if (element.HasValue)
{
item.Header += (" = " + element.Value);
}
if (element.ElementCount > 0)
{
foreach (var child in element.SubElements)
{
item.Items.Add(GetLeaf(child));
}
}
return(item);
}
//public static IEnumerable<ITreeDataElement> GetFlatListOfSubElements(this ITreeDataElement element, Predicate<ITreeDataElement> predicate = null)
//{
// ITreeDataElement current = element.SubElements.FirstOrDefault();
// while (current != null)
// {
// bool passThroughFilter = predicate == null || predicate(current);
// if (passThroughFilter) yield return current;
// ITreeDataElement next = (passThroughFilter && current.ElementCount > 0) ? current.SubElements.FirstOrDefault() : null;
// if (next != null)
// {
// current = next;
// }
// else
// {
// while (true)
// {
// next = current.GetNextSibling();
// if (next != null)
// {
// current = next;
// break;
// }
// else
// {
// current = current.Parent;
// if (current == null || Object.ReferenceEquals(current, element))
// {
// current = null;
// }
// }
// }
// }
// }
//}
public static ITreeDataElement GetNextSibling(this ITreeDataElement element)
{
if (element.Parent == null)
{
return(null);
}
bool thisFound = false;
foreach (var sibling in element.Parent.SubElements)
{
if (thisFound)
{
return(sibling);
}
if (Object.ReferenceEquals(sibling, element))
{
thisFound = true;
}
}
return(null);
}
public static IEnumerable <ITreeDataElement> GetFlatListOfSubElements(this ITreeDataElement element, Predicate <ITreeDataElement> predicate = null)
{
if (element.ElementCount > 0)
{
foreach (var sub in element.SubElements)
{
if (predicate == null || predicate(sub))
{
yield return(sub);
if (sub.ElementCount > 0)
{
foreach (var subsub in sub.GetFlatListOfSubElements(predicate))
{
yield return(subsub);
} // Note: Not sure how effective this method is (many levels of foreach).
}
}
}
}
}
public static string GetValue(this ITreeDataElement element, string subElement, int index)
{
if (element.ElementCount > 0)
{
var sub = element.SubElements.Where(e => String.Equals(e.Name, subElement, StringComparison.InvariantCulture)).ElementAtOrDefault(index);
if (sub != null)
{
if (sub.HasValue)
{
return(sub.Value);
}
else
{
throw new Exception("No sub-elements named '" + element + "' found.");
}
}
else
{
throw new Exception("No sub-elements found.");
}
}
throw new Exception("No sub-elements found.");
}
public void GetAndSetParameterValues()
{
Expression <Predicate <int> > expression = n => n < 10;
ITreeDataElement treeElement = expression.CreateDataTree(null);
}
