/// <summary>
/// Creates a display field metadata for the specified reference field.
/// </summary>
/// <param name="parentField">
/// The parent reference field.
/// </param>
/// <param name="itemType">
/// The cross-reference item type.
/// </param>
/// <param name="propertyName">
/// The name of the property that represents the display field.
/// </param>
/// <param name="displayFieldMetadata">
/// The created display field metadata.
/// </param>
/// <returns>
/// <c>true</c> if the display field metadata is created successfully; otherwise, <c>false</c>.
/// </returns>
public static bool TryCreateDisplayField(IReferenceFieldMetadata parentField, Type itemType, string propertyName, out DisplayFieldMetadata displayFieldMetadata)
{
if (parentField == null)
throw new ArgumentNullException("parentField");
if (itemType == null)
throw new ArgumentNullException("itemType");
if (string.IsNullOrEmpty(propertyName))
throw new ArgumentException(@"Property name is null or empty.", propertyName);
displayFieldMetadata = null;
var property = itemType.GetProperty(propertyName, BindingFlags.Public | BindingFlags.Instance);
if (property == null)
{
return false;
}
var displayFieldAttribute = property.GetCustomAttribute<ReferenceDisplayFieldAttribute>(false);
if (displayFieldAttribute == null)
{
return false;
}
if (string.IsNullOrEmpty(displayFieldAttribute.FullPath))
{
return false;
}
var joinFields = new List<IReferenceFieldMetadata>();
var referencedProcess = parentField.ReferencedProcess;
var fieldNames = displayFieldAttribute.FullPath.Split(new[] { "." }, StringSplitOptions.None);
for (var i = 0; i < fieldNames.Length - 1; ++i)
{
IFieldMetadata field;
if (!referencedProcess.TryGetField(fieldNames[i], out field))
{
return false;
}
var joinField = field as IReferenceFieldMetadata;
if (joinField == null)
{
return false;
}
joinFields.Add(joinField);
referencedProcess = joinField.ReferencedProcess;
}
IFieldMetadata displayField;
if (!referencedProcess.TryGetField(fieldNames.Last(), out displayField))
{
return false;
}
displayFieldMetadata = new DisplayFieldMetadata(property.Name, displayField, joinFields);
return true;
}
private static string FormatValue(DisplayFieldMetadata displayField, object value)
{
if (displayField.IsAggregated)
{
// Aggregated fields are formatted on SQL Server.
return (string)value;
}
if (displayField.Field.ColumnType == ColumnTypes.Approval)
{
return FormatApprovalValue(value);
}
var dateTimeFieldMetadata = displayField.Field as DateTimeFieldMetadata;
if (dateTimeFieldMetadata != null)
{
return FormatDateTimeValue(dateTimeFieldMetadata, value);
}
var booleanFieldMetadata = displayField.Field as BooleanFieldMetadata;
if (booleanFieldMetadata != null)
{
return FormatBooleanValue(booleanFieldMetadata, value);
}
var numericFieldMetadata = displayField.Field as NumericFieldMetadata;
if (numericFieldMetadata != null)
{
return FormatNumericValue(numericFieldMetadata, value);
}
return value != null ? value.ToString() : null;
}
private static FilterMemberValue CreateMemberValue(IReferenceItem item, DisplayFieldMetadata displayField, IList<DisplayFieldMetadata> displayFields)
{
IDictionary<string, object> details = null;
if (displayFields.Count > 1)
{
details = new Dictionary<string, object>();
foreach (var field in displayFields)
{
var formattedValue = FormatValue(field, item.GetValueByPropertyName(field.Name));
if (formattedValue != null)
{
details[field.Name] = formattedValue;
}
}
}
return new FilterMemberValue(FormatValue(displayField, item.GetValueByPropertyName(displayField.Name)), item.Id, details);
}
private IEnumerable<FilterMemberValue> GetReferenceFieldValues(
IFieldMetadata referenceField,
DisplayFieldMetadata displayField,
IList<DisplayFieldMetadata> detailsFields)
{
using (new BypassPropertyCheckContext())
{
var items = DynamicTypeManager.GetReferenceList<IReferenceItem>(
referenceField.DeclaringProcess.Name,
referenceField.Name,
null,
null,
int.MaxValue,
0,
null);
detailsFields = detailsFields.Where(CanIncludeInMemberDetails).ToArray();
return items.OrderBy(x => x.GetValueByPropertyName(displayField.Name)).Select(x => CreateMemberValue(x, displayField, detailsFields)).ToList();
}
}
private static FilterMemberDetailsFieldDefinition CreateDetailsFieldDefinition(DisplayFieldMetadata displayField)
{
return new FilterMemberDetailsFieldDefinition { DisplayName = displayField.DisplayName, ColumnName = displayField.Name };
}
private static bool CanIncludeInMemberDetails(DisplayFieldMetadata displayField)
{
return displayField.Field.ColumnType != ColumnTypes.Image;
}
