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	- 增加 DbContext/Repository 比较变化方法 CompareState;
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		@@ -212,6 +212,17 @@ namespace FreeSql
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            this.Set<TEntity>().AttachOnlyPrimary(data);
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            return this;
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        }
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        /// <summary>
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        /// 比较实体,计算出值发生变化的属性,以及属性变化的前后值
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        /// </summary>
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        /// <param name="newdata">最新的实体对象,它将与附加实体的状态对比</param>
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        /// <returns></returns>
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        public Dictionary<string, object[]> CompareState<TEntity>(TEntity newdata) where TEntity : class
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        {
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            CheckEntityTypeOrThrow(typeof(TEntity));
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            return this.Set<TEntity>().CompareState(newdata);
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        }
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#if net40
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#else
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        public Task AddAsync<TEntity>(TEntity data) where TEntity : class
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