在OData输出中编码字符串字段 [英] Encode string fields in OData output

问题描述

我有一个OData控制器，希望对其输出的字符串字段进行编码. OData输出结果以明文形式发送回客户端，但是我想在将其发送到客户端之前对其进行加密.

I have an OData controller that want to encode string fields of its output. OData output result is sent back to client as clear data but I want to encrypt them before sending it to client.

似乎最好的方法是使用自定义的OData序列化器或feed序列化器来实现我的目标.但是我不确定要定制哪个类.重写某些方法还是实现我自己的序列化类的自定义版本，是更好的选择.

It seems that the best way is to use a customized OData serializer or a feed serializer to achieve my goal. But I'm not sure which class to customize. Is it better to override some methods or implement my own customized version of a serializing class.

感谢您的帮助.

推荐答案

找到一种方法.我是通过本指南的自定义序列化程序来实现的.最终代码:

Find a way to do it. I did it by customizing serializer by help of this guide. Final code:

using Microsoft.Data.Edm;
using Microsoft.Data.OData;
using System.Web.Http.OData.Formatter.Serialization;

namespace MyProj
{
    public class CustomODataEntityTypeSerializer : ODataEntityTypeSerializer
    {
        public CustomODataEntityTypeSerializer(ODataSerializerProvider serializerProvider) : base(serializerProvider)
        {
        }

        public override void WriteObjectInline(object graph, IEdmTypeReference expectedType, ODataWriter writer, ODataSerializerContext writeContext)
        {
            //http://odata.github.io/WebApi/#06-03-costomize-odata-formatter

            if (graph is CompanyDto)
            {
                var company = (CompanyDto)graph;

                company.FirstName = Encrypt(company.FirstName);
                company.LastName = Encrypt(company.LastName);
            }

            base.WriteObjectInline(graph, expectedType, writer, writeContext);
        }
    }
}

这堂课:

using Microsoft.Data.Edm;
using System.Web.Http.OData.Formatter.Serialization;

namespace MyProj
{
    public class CustomDefaultODataSerializerProvider : DefaultODataSerializerProvider
    {
        CustomODataEntityTypeSerializer _customODataEntityTypeSerializer;

        public CustomDefaultODataSerializerProvider()
        {
            _customODataEntityTypeSerializer = new CustomODataEntityTypeSerializer(this);
        }

        public override ODataEdmTypeSerializer GetEdmTypeSerializer(IEdmTypeReference edmType)
        {
            if (edmType.IsEntity())
            {
                return _customODataEntityTypeSerializer;
            }

            return base.GetEdmTypeSerializer(edmType);
        }
    }
}

并按如下所示对其进行初始化:

And initializing it as follow:

            var odataFormatters = ODataMediaTypeFormatters.Create(new CustomDefaultODataSerializerProvider(), new DefaultODataDeserializerProvider());
        config.Formatters.InsertRange(0, odataFormatters);

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