/// <summary>
/// 删除实体
/// </summary>
/// <param name="whereCondition"></param>
/// <returns></returns>
public virtual int DeleteByCondition(Expression <Func <TEntity, bool> > whereCondition)
{
Specification <TEntity> specification = ExpressionSpecification <TEntity> .Eval(whereCondition);
IList <TEntity> col = this.GetByCondition(specification);
this._dbContext.Set <TEntity>().RemoveRange(col);
col.ToList().ForEach(t =>
{
this._dbContext.Entry <TEntity>(t).State = EntityState.Deleted;
});
return(this._dbContext.SaveChanges());
}