本系列原創博客代碼已在EntityFramework6.0.0測試通過，轉載請標明出處

有時候我們要通過IQueryable獲取所在的DbContext信息，這是完全可以的。

以下代碼從個人開源框架中抽取而出

using System; using System.Data.Entity; using System.Data.Entity.Core.Objects; using System.Data.Entity.Infrastructure; using System.Data.Entity.Infrastructure.Interception; using System.Linq; using System.Reflection;/* * CopyRight ?2017 All Rights Reserved * 作者:Rex Sheng */ namespace SuperNet.EntityFramework.Extensions {public static class IQueryableExtensions{public static DbContext GetDbContext<TEntity>(this IQueryable<TEntity> query) where TEntity : class{ObjectQuery<TEntity> objectQuery = null;DbQuery<TEntity> dbQuery = null;if(query is ObjectQuery<TEntity>){objectQuery = (ObjectQuery<TEntity>)query;}else{if(query is DbQuery<TEntity>){dbQuery = (DbQuery<TEntity>)query;var propers = dbQuery.GetType().GetProperty("InternalQuery", BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic);if (propers == null){throw new Exception("未能從IQueryable表達式找到DbContext。您確定此表達式來自Ef DbContext嗎?");}var obj = propers.GetValue(dbQuery, null);propers = obj.GetType().GetProperty("ObjectQuery", BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic);if (propers == null){throw new Exception("未能從IQueryable表達式找到DbContext。您確定此表達式來自Ef DbContext嗎?");}objectQuery = propers.GetValue(obj, null) as ObjectQuery<TEntity>;if (objectQuery == null){throw new Exception("未能從IQueryable表達式找到DbContext。您確定此表達式來自Ef DbContext嗎?");}}else{throw new Exception("未能從IQueryable表達式找到DbContext。您確定此表達式來自Ef DbContext嗎?");}}return objectQuery.Context.GetDbContext();}} }

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轉載于:https://www.cnblogs.com/RexSheng/p/10928422.html

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