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The MetaEnum class represents single or multi-select enumerations. When a new meta-enum is created, a meta-type with the McDataType property and McDataType.Enum value is registered. If an enumerator has been created, you can create a new field with the enumerator meta-type. The entity object property returns the selected item ID (Int32) or an array of selected item IDs (Int32[]).
Note: When you create and delete meta-enums, remember that you can modify a meta-model only in Design mode. See the MetaClassManager class section.
Because the enumerator is an original meta-type, you can get all enumerators from the MetaClassManager.RegisteredTypes property.
Example: Find all enumerators
foreach(MetaFieldType type in DataContext.Current.MetaModel.RegisteredTypes)
{
if (type.McDataType == McDataType.Enum)
{
// The enumerator is found
}
}
The following methods from the MetaEnum class are useful when managing enumerators:
Call the Create method of the MetaEnum class, passing type name, friendly name and MultyValue flag to create a new enumerator.
Example: Create a new enumerator
MetaFieldType newEnum = MetaEnum.Create(enumName, enumFriendlyName, bMultyValue);
If you created an enumerator, you can create a new field with the enumerator meta-type.
Example: Creation of enum meta-field
public MetaField CreateEnumField(string name, string friendlyName, string enumName, bool isNullable, string defaultValue, bool enumEditable)
{
if (name == null)
throw new ArgumentNullException("name");
if (friendlyName == null)
throw new ArgumentNullException("friendlyName");
AttributeCollection attr = new AttributeCollection();
attr.Add(McDataTypeAttribute.EnumEditable, enumEditable);
MetaField retVal = this.MetaClass.CreateMetaField(name, friendlyName, enumName, isNullable, defaultValue, attr);
return retVal;
}
Last updated: Oct 12, 2015