C# 向IQueryable添加一个Include扩展方法
Posted 吴晓阳
tags:
篇首语:本文由小常识网(cha138.com)小编为大家整理,主要介绍了C# 向IQueryable添加一个Include扩展方法相关的知识,希望对你有一定的参考价值。
using System; using System.Data.Objects; using System.Linq; namespace OutOfMemory.Codes { /// <summary> /// Adds extension methods to the <see cref="IQueryable{T}"/> class. /// </summary> public static class QueryableExtender { /// <summary> /// Specifies the related objects to include in the query results. /// </summary> /// <typeparam name="T"><see cref="Type"/> of query to extend.</typeparam> /// <param name="this">The query to extend.</param> /// <param name="path"> /// Dot-separated list of related objects to return in the query results. /// </param> /// <returns> /// A new <see cref="IQueryable{T}"/> with the defined query path. /// </returns> /// <exception cref="ArgumentNullException"> /// The parameter <paramref name="path"/> is null. /// </exception> /// <exception cref="ArgumentException"> /// The parameter <paramref name="path"/> is empty. /// </exception> public static IQueryable<T> Include<T>(this IQueryable<T> @this, string path) { var objectQuery = @this as ObjectQuery<T>; if (objectQuery != null) { return objectQuery.Include(path); } return @this; } } }
DbExtensions.Include<T> Method (IQueryable<T>, String)
https://msdn.microsoft.com/en-us/library/system.data.entity.dbextensions.include
Namespace: System.Data.Entity
Assembly: EntityFramework (in EntityFramework.dll)
以上是关于C# 向IQueryable添加一个Include扩展方法的主要内容,如果未能解决你的问题,请参考以下文章
向 IQueryable 添加扩展方法,该方法对列表进行分页并在从 API 控制器方法返回时返回 json 对象
C# Entity Framework中的IQueryable和IQueryProvider详解
C# Entity Framework中的IQueryable和IQueryProvider详解