ASP.NET is considered as
a division of the .NET Framework and when coding ASP.NET
applications, one can have access to classes in the .NET Framework.
Using this language, you can easily build ASP.NET applications that
deliver advantages from the type safety, common language runtime,
inheritance, etc.
Now, ASP.NET comes with Web API OData
5.3 that can be installed by referring below given information.
Download
Users can find the runtime features
that released as NuGet packages on the NuGet gallery. Using the NuGet
Package Manager Console, you can install or update to the released
NuGet packages.
Install-Package Microsoft.AspNet.OData
-Version 5.3.0
Install-Package
Microsoft.AspNet.WebApi.OData -Version 5.3.0
Documentation
If you are looking for tutorials and
other documentation about ASP.NET Web API OData, then visit this link.
OData Core Libraries
ODataLib version 6.5.0 is used by Web
API for OData v4
Some Amazing ASP.NET Web API OData
5.3 features are:
- Support for Open Entity Types
An open type is also better known as
structured type that comes with dynamic properties along with other
properties that are declared in the type definition. One can simply
add flexibility in their data models. For more information, see xxxx.
- Support for $levels in $expand
The $levels query option can be easily
used in $expand queries. For example:
- Support for dynamic collection properties in open types
Previously, one can find a single value
to a dynamic property. Collection values are there in dynamic
properties in 5.3. If you are looking at the example, we find that in
the following JSON payload, the emails property is a dynamic and is
of collection of string type:
{
"Id": 1,
"Name": "Ben",
"Emails@odata.type":
"#Collection(Edm.String)",
"Emails": [
"a@a.com",
"b@b.com"
]
}
- Support for inheritance for complex types
One can inherit complex types from a
base type. For example: the below given complex types could be
defined by an OData service.
public abstract class Shape
{
public bool HasBorder { get; set; }
}
public class Point
{
public int X { get; set; }
public int Y { get; set; }
}
public class Circle : Shape
{
public Point Center { get; set; }
public int Radius { get; set; }
public override string ToString()
{
return "{" + Center.X +
"," + Center.Y + "," + Radius + "}";
}
}
public class Polygon : Shape
{
public IList<Point> Vertexes {
get; set; }
public Polygon()
{
Vertexes = new List<Point>();
}
}
Check out the EDM for this example:
<?xml version="1.0"
encoding="utf-8"?>
<edmx:Edmx Version="4.0"
xmlns:edmx="http://docs.oasis-open.org/odata/ns/edmx">
<edmx:DataServices>
<Schema
Namespace="ODataComplexTypeInheritanceSample"
xmlns="http://docs.oasis-open.org/odata/ns/edm">
<ComplexType Name="Shape"
Abstract="true">
<Property Name="HasBorder"
Type="Edm.Boolean" Nullable="false" />
</ComplexType>
<ComplexType Name="Polygon"
BaseType="ODataComplexTypeInheritanceSample.Shape">
<Property Name="Vertexes"
Type="Collection(ODataComplexTypeInheritanceSample.Point)"
/>
</ComplexType>
<ComplexType Name="Point">
<Property Name="X"
Type="Edm.Int32" Nullable="false" />
<Property Name="Y"
Type="Edm.Int32" Nullable="false" />
</ComplexType>
<ComplexType Name="Circle"
BaseType="ODataComplexTypeInheritanceSample.Shape">
<Property Name="Center"
Type="ODataComplexTypeInheritanceSample.Point" />
<Property Name="Radius"
Type="Edm.Int32" Nullable="false" />
</ComplexType>
<EntityContainer Name="Container">
</EntityContainer>
</Schema>
</edmx:DataServices>
</edmx:Edmx>
Known Issues and Breaking Changes
The known issues and breaking changes
are described in this section in the ASP.NET Web API OData 5.3.
OData v4
Query Options
Problem: the use of nested $expand with
$levels=max results in an incorrect expansion depth.
For example, given the following
request:
~/Entities(6)?$expand=P($levels=2;$expand=D($levels=max))
This query would result in an expansion
depth of 6, if MaxExpansionDepth is 5.
Bug Fixes and Minor Feature Updates
Several bug fixes and minor feature
updates are included in this release. For complete list, you can
click here.
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