/// <summary>
/// Projects the element of this query into a new form.
/// </summary>
/// <typeparam name="TResult">The type of the value returned by selector.</typeparam>
/// <param name="selector">A lambda expression that indicates the property returns.</param>
/// <returns>A <see cref="Microsoft.OData.Client.DataServiceQuerySingle{T}" /> whose element is the result of invoking the transform function on the element of source.</returns>
public DataServiceQuerySingle <TResult> Select <TResult>(Expression <Func <TElement, TResult> > selector)
{
if (this.Query == null)
{
this.Query = Context.CreateSingletonQuery <TElement>(GetPath(null));
}
return(new DataServiceQuerySingle <TResult>((DataServiceQuery <TResult>)Query.Select(selector), true));
}
public DataServiceQuery CreateObjectQuery(string entityName, CriteriaOperator filter, Dictionary <string, string> properties)
{
var entityType = GetTypeDefinition(entityName);
DataServiceQuery query = CreateQuery(entityName);
bool hasIsDeletedProperty = HasField(query.ElementType, "IsDeleted");
if (hasIsDeletedProperty)
{
BinaryOperator deletedFilter = new BinaryOperator("IsDeleted", false);
if ((object)filter == null)
{
filter = deletedFilter;
}
else
{
filter = filter & deletedFilter;
}
}
if ((object)filter != null)
{
query = DataServiceQueryTranslator.Translate(query, filter);
}
if (properties != null)
{
var propertyNames = entityType.StructuralProperties().Where(p => !properties.ContainsKey(p.Name)).Select(p => p.Name).ToList();
propertyNames.ForEach(p => properties.Add(p, p));
var fetchingProperties = properties.Select(addition => addition.Value + " AS " + addition.Key);
query = query.Select("new(" + string.Join(",", fetchingProperties) + ")") as DataServiceQuery;
}
return(query);
}
