本节内容：
OData在odata.org上的定义是：“一个开放的协议,允许创建和使用可查询、可互操作的RESTful api的简单的标准方式”。你可以在ABP里使用OData，Abp.Web.Api.OData的nuget包简化了它的使用方式。
在我们的WebApi项目里，先安装Abp.Web.api.Odata的nuget包：
Install-Package Abp.Web.Api.OData
在我们的模块上设置对AbpWebApiOdataModule的依赖，例如：
(AbpWebApiODataModule))]
public class MyProjectWebApiModule : AbpModule
{
...
}
查看模块系统更好地理解模块依赖。
OData需要声明哪个实体作为它的资源，我们应当在我们模块的PreInitialize方法里指定，如下所示：
[DependsOn(typeof(AbpWebApiODataModule))]
public class MyProjectWebApiModule : AbpModule
{
public override void PreInitialize()
{
var builder = Configuration.Modules.AbpWebApiOData().ODataModelBuilder;
//Configure your entities here...
builder.EntitySet<Person>("Persons");
}
...
}
此处，我们ODataModelBuilder的引用，并给它设置了Person实体，类似地，你可以使用EntitySet来添加其它实体，查看OData文档获取更多信息。
Abp.Web.Api.OData的nuget包包括了AbpODataEntityController基类（它扩展了标准的ODataController），用它可更容易地创建你自己的控制器，如下是一个为Person实体创建一个OData端点的例子：
public class PersonsController : AbpODataEntityController<Person>
{
public PersonsController(IRepository<Person> repository)
: base(repository)
{
}
}
这很简单，AbpODataEntityController的所有方法都是virtual，也就是说你可以重写Get、Post、Put、Patch、Delete和其它Action来添加自己的逻辑。
这里我们列几个请求上面定义的控制器的基本的例子，假设应用工作在http://localhost:61842上，因为OData是一个标准的协议，你可以很容易地在网页上找到更深入的例子。
获取所有person。
GET http://localhost:61842/odata/Persons
{
"@odata.context":"http://localhost:61842/odata/$metadata#Persons","value":[
{
"Name":"Douglas Adams","IsDeleted":false,"DeleterUserId":null,"DeletionTime":null,"LastModificationTime":null,"LastModifierUserId":null,"CreationTime":"2015-11-07T20:12:39.363+03:00","CreatorUserId":null,"Id":1
},{
"Name":"John Nash","IsDeleted":false,"DeleterUserId":null,"DeletionTime":null,"LastModificationTime":null,"LastModifierUserId":null,"CreationTime":"2015-11-07T20:12:39.363+03:00","CreatorUserId":null,"Id":2
}
]
}
获取Id=2的person。
GET http://localhost:61842/odata/Persons(2)
{
"@odata.context":"http://localhost:61842/odata/$metadata#Persons/$entity","Name":"John Nash","IsDeleted":false,"DeleterUserId":null,"DeletionTime":null,"LastModificationTime":null,"LastModifierUserId":null,"CreationTime":"2015-11-07T20:12:39.363+03:00","CreatorUserId":null,"Id":2
}
获取Id=1的person包含它的电话号码。
GET http://localhost:61842/odata/Persons(1)?$expand=Phones
{
"@odata.context":"http://localhost:61842/odata/$metadata#Persons/$entity","Name":"Douglas Adams","IsDeleted":false,"DeleterUserId":null,"DeletionTime":null,"LastModificationTime":null,"LastModifierUserId":null,"CreationTime":"2015-11-07T20:12:39.363+03:00","CreatorUserId":null,"Id":1,"Phones":[
{
"PersonId":1,"Type":"Mobile","Number":"4242424242","CreationTime":"2015-11-07T20:12:39.363+03:00","CreatorUserId":null,"Id":1
},{
"PersonId":1,"Type":"Mobile","Number":"2424242424","CreationTime":"2015-11-07T20:12:39.363+03:00","CreatorUserId":null,"Id":2
}
]
}
这里列举一个稍微复杂点的查询，包含过滤，排序和获取最前面2条结果。
GET http://localhost:61842/odata/Persons?$filter=Name eq ‘Douglas Adams‘&$orderby=CreationTime&$top=2
{
"@odata.context":"http://localhost:61842/odata/$metadata#Persons","value":[
{
"Name":"Douglas Adams","IsDeleted":false,"DeleterUserId":null,"DeletionTime":null,"LastModificationTime":null,"LastModifierUserId":null,"CreationTime":"2015-11-07T20:12:39.363+03:00","CreatorUserId":null,"Id":1
},{
"Name":"Douglas Adams","IsDeleted":false,"DeleterUserId":null,"DeletionTime":null,"LastModificationTime":null,"LastModifierUserId":null,"CreationTime":"2016-01-12T20:29:03+02:00","CreatorUserId":null,"Id":3
}
]
}
OData支持分页，排序，过滤，投射等更多，请查阅它自己的文档。
接下来的例子，我们创建一个新person。
POST http://localhost:61842/odata/Persons
{
Name: "Galileo Galilei"
}
此处，“Content-Type"头是”application/json“。
{
"@odata.context": "http://localhost:61842/odata/$metadata#Persons/$entity",
"Name": "Galileo Galilei",
"IsDeleted": false,
"DeleterUserId": null,
"DeletionTime": null,
"LastModificationTime": null,
"LastModifierUserId": null,
"CreationTime": "2016-01-12T20:36:04.1628263+02:00",
"CreatorUserId": null,
"Id": 4
}
如果我们再次获取列表，我们可以看到这个新person，也OData支持更新或删除一个已经存在的实体。
我们可以获取实体的元数据，如接下来的例子所示。
GET http://localhost:61842/odata/$metadata
<?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="AbpODataDemo.People" xmlns="http://docs.oasis-open.org/odata/ns/edm">
<EntityType Name="Person">
<Key>
<PropertyRef Name="Id" />
</Key>
<Property Name="Name" Type="Edm.String" Nullable="false" />
<Property Name="IsDeleted" Type="Edm.Boolean" Nullable="false" />
<Property Name="DeleterUserId" Type="Edm.Int64" />
<Property Name="DeletionTime" Type="Edm.DateTimeOffset" />
<Property Name="LastModificationTime" Type="Edm.DateTimeOffset" />
<Property Name="LastModifierUserId" Type="Edm.Int64" />
<Property Name="CreationTime" Type="Edm.DateTimeOffset" Nullable="false" />
<Property Name="CreatorUserId" Type="Edm.Int64" />
<Property Name="Id" Type="Edm.Int32" Nullable="false" />
<NavigationProperty Name="Phones" Type="Collection(AbpODataDemo.People.Phone)" />
</EntityType>
<EntityType Name="Phone">
<Key>
<PropertyRef Name="Id" />
</Key>
<Property Name="PersonId" Type="Edm.Int32" />
<Property Name="Type" Type="AbpODataDemo.People.PhoneType" Nullable="false" />
<Property Name="Number" Type="Edm.String" Nullable="false" />
<Property Name="CreationTime" Type="Edm.DateTimeOffset" Nullable="false" />
<Property Name="CreatorUserId" Type="Edm.Int64" />
<Property Name="Id" Type="Edm.Int32" Nullable="false" />
<NavigationProperty Name="Person" Type="AbpODataDemo.People.Person">
<ReferentialConstraint Property="PersonId" ReferencedProperty="Id" />
</NavigationProperty>
</EntityType>
<EnumType Name="PhoneType">
<Member Name="Unknown" Value="0" />
<Member Name="Mobile" Value="1" />
<Member Name="Home" Value="2" />
<Member Name="Office" Value="3" />
</EnumType>
</Schema>
<Schema Namespace="Default" xmlns="http://docs.oasis-open.org/odata/ns/edm">
<EntityContainer Name="Container">
<EntitySet Name="Persons" EntityType="AbpODataDemo.People.Person" />
</EntityContainer>
</Schema>
</edmx:DataServices>
</edmx:Edmx>
元数据用来查看服务信息。
你可以从https://github.com/aspnetboilerplate/sample-odata上获取这个示例项目的源代码。
原文：http://www.cnblogs.com/guyuehuanhuan/p/6091179.html