/// <summary>
/// Generate CanExpand and ChildrenGetter delegates from the given property.
/// </summary>
/// <param name="tlv"></param>
/// <param name="pinfo"></param>
protected virtual void GenerateChildrenDelegates(TreeListView tlv, PropertyInfo pinfo)
{
Munger childrenGetter = new Munger(pinfo.Name);
tlv.CanExpandGetter = delegate(object x) {
try {
IEnumerable result = childrenGetter.GetValueEx(x) as IEnumerable;
return(!ObjectListView.IsEnumerableEmpty(result));
}
catch (MungerException ex) {
System.Diagnostics.Debug.WriteLine(ex);
return(false);
}
};
tlv.ChildrenGetter = delegate(object x) {
try {
return(childrenGetter.GetValueEx(x) as IEnumerable);
}
catch (MungerException ex) {
System.Diagnostics.Debug.WriteLine(ex);
return(null);
}
};
}
/// <summary>
/// A helper method to put the given value into the given aspect of the given object.
/// </summary>
/// <remarks>This method catches and silently ignores any errors that occur
/// while modifying the target object</remarks>
/// <param name="target">The object to be modified</param>
/// <param name="propertyName">The name of the property/field to be modified</param>
/// <param name="value">The value to be assigned</param>
/// <returns>Did the modification work?</returns>
public static bool PutProperty(object target, string propertyName, object value) {
try {
Munger munger = new Munger(propertyName);
return munger.PutValue(target, value);
}
catch (MungerException) {
// Not a lot we can do about this. Something went wrong in the bowels
// of the property. Let's take the ostrich approach and just ignore it :-)
}
return false;
}
/// <summary>
/// A helper method to put the given value into the given aspect of the given object.
/// </summary>
/// <remarks>This method catches and silently ignores any errors that occur
/// while modifying the target object</remarks>
/// <param name="target">The object to be modified</param>
/// <param name="propertyName">The name of the property/field to be modified</param>
/// <param name="value">The value to be assigned</param>
/// <returns>Did the modification work?</returns>
public static bool PutProperty(object target, string propertyName, object value) {
try {
Munger munger = new Munger(propertyName);
return munger.PutValue(target, value);
}
catch (MungerException) {
// Not a lot we can do about this. Something went wrong in the bowels
// of the property. Let's take the ostrich approach and just ignore it :-)
// Normally, we would never just silently ignore an exception.
// However, in this case, this is a utility method that explicitly
// contracts to catch and ignore errors. If this is not acceptible,
// the programmer should not use this method.
}
return false;
}
/// <summary>
/// Fetch the description from the model class
/// </summary>
/// <param name="model"></param>
/// <returns></returns>
public virtual string GetDescription(object model)
{
if (String.IsNullOrEmpty(this.DescriptionAspectName))
return String.Empty;
if (this.descriptionGetter == null)
this.descriptionGetter = new Munger(this.DescriptionAspectName);
return this.descriptionGetter.GetValue(model) as string;
}
/// <summary>
/// Fetch the description from the model class
/// </summary>
/// <returns></returns>
protected virtual string GetDescription()
{
if (String.IsNullOrEmpty(this.DescriptionAspectName))
return String.Empty;
if (this.descriptionGetter == null)
this.descriptionGetter = new Munger(this.DescriptionAspectName);
return this.descriptionGetter.GetValue(this.RowObject) as String;
}
/// <summary>
/// If the given munger returns the same value for all the given
/// songs, then return that value. Otherwise, return an empty string.
/// </summary>
/// <param name="songs">The list of songs to be considered</param>
/// <param name="munger">The munger which will extract the value</param>
/// <returns>The common value or an empty string</returns>
private string GetCommonValue(IList<Song> songs, Munger munger)
{
if (songs.Count == 0 || songs.Count > 1000)
return "";
string value = (string)munger.GetValue(songs[0]);
for (int i = 1; i < songs.Count; i++) {
if (value != (string)munger.GetValue(songs[i]))
return "";
}
return value;
}
/// <summary>
/// Generate CanExpand and ChildrenGetter delegates from the given property.
/// </summary>
/// <param name="tlv"></param>
/// <param name="pinfo"></param>
protected virtual void GenerateChildrenDelegates(TreeListView tlv, PropertyInfo pinfo) {
Munger childrenGetter = new Munger(pinfo.Name);
tlv.CanExpandGetter = delegate(object x) {
try {
IEnumerable result = childrenGetter.GetValueEx(x) as IEnumerable;
return !ObjectListView.IsEnumerableEmpty(result);
}
catch (MungerException ex) {
System.Diagnostics.Debug.WriteLine(ex);
return false;
}
};
tlv.ChildrenGetter = delegate(object x) {
try {
return childrenGetter.GetValueEx(x) as IEnumerable;
}
catch (MungerException ex) {
System.Diagnostics.Debug.WriteLine(ex);
return null;
}
};
}
