public static object GetSum(IEntityField2 field, IRelationPredicateBucket filter)
{
using (DataAccessAdapter adapter = DataAccessAdapterManagerBase.CreateAdapter())
{
return(adapter.GetScalar(field, null, AggregateFunction.Sum, filter.PredicateExpression, null, filter.Relations));
}
}
private static object ConvertStringToFieldValue(IEntityField2 field, string fieldValueStr)
{
var dataValueStr = fieldValueStr.Trim('\'', '\"');
var dataType = field.DataType;
if (dataType.IsGenericType && dataType.GetGenericTypeDefinition() == typeof(Nullable <>))
{
if (string.IsNullOrEmpty(fieldValueStr))
{
return(null); // it's ok to return null for nullable types
}
dataType = dataType.GenericTypeArguments[0];
}
object dataValue = null;
var cannotConvert = true;
if (CanChangeType(fieldValueStr, dataType))
{
try
{
dataValue = Convert.ChangeType(dataValueStr, dataType);
cannotConvert = false;
}
catch
{
}
}
if (cannotConvert)
{
throw new ArgumentException(string.Format("Value '{0}' cannot be converted to type {1}.", dataValueStr, dataType));
}
return(dataValue);
}
/// <summary>
/// Gets a collection of Products sorted by the passed in filed name, and direction of sort.
/// </summary>
/// <param name="sortOnField">field name to sort upon</param>
/// <param name="direction">direction of sort</param>
/// <returns>a sorted products collection</returns>
/// <remarks>Shows how to use message parameters to specify sorting.
/// </remarks>
public IEntityCollection2 GetProductsSortedBy(string sortOnField, SortOperator direction)
{
EntityCollection toReturn = new EntityCollection(new ProductsEntityFactory());
ProductsEntity product = new ProductsEntity();
SortExpression sorter = null;
IEntityField2 sortField = product.Fields[sortOnField];
if (sortField != null)
{
sorter = new SortExpression(new SortClause(sortField, null, direction));
}
using (DataAccessAdapter adapter = new DataAccessAdapter())
{
// fetch all products, sorted on the sort expression passed in
adapter.FetchEntityCollection(toReturn, null, 0, sorter);
}
return(toReturn);
}
private static object ConvertStringToFieldValue(IEntityField2 field, string fieldValueStr)
{
var dataValueStr = fieldValueStr.Trim('\'', '\"');
var dataType = field.DataType;
if (dataType.IsGenericType && dataType.GetGenericTypeDefinition() == typeof(Nullable<>))
{
if (string.IsNullOrEmpty(fieldValueStr))
return null; // it's ok to return null for nullable types
dataType = dataType.GenericTypeArguments[0];
}
object dataValue = null;
var cannotConvert = true;
if (CanChangeType(fieldValueStr, dataType))
{
try
{
dataValue = Convert.ChangeType(dataValueStr, dataType);
cannotConvert = false;
}
catch
{
}
}
if (cannotConvert)
throw new ArgumentException(string.Format("Value '{0}' cannot be converted to type {1}.", dataValueStr, dataType));
return dataValue;
}
/// <summary>
/// Retrieves the persistence info for the field passed in.
/// </summary>
/// <param name="field">Field which fieldpersistence info has to be retrieved</param>
/// <returns>the requested persistence information</returns>
protected override IFieldPersistenceInfo GetFieldPersistenceInfo(IEntityField2 field)
{
IFieldPersistenceInfo persistenceInfo = PersistenceInfoFactory.GetFieldPersistenceInfo(field.ContainingObjectName, field.Name);
InsertPersistenceInfoObjects(field.ExpressionToApply);
return persistenceInfo;
}
/// <summary>
/// Gets the source column name for an <see cref="IEntityField2"/> in the persistent storage.
/// </summary>
/// <param name="field">The field to get the column name for.</param>
/// <returns>Returns the source column name for a <see cref="IEntityField2"/> in the persistent storage.</returns>
public string GetPersistentFieldName(IEntityField2 field)
{
var i = GetFieldPersistenceInfo(field);
return(i.SourceColumnName);
}