DataTable排序与List顺序不一致？两个方法搞定

为什么DataTable排序会跑偏许多人于开展数据展示操作之际, 都会遭遇一个令人头疼不已的问题, 那便是, 明明在后台代码当中费心费力地维护了一个List, 其中的顺序乃是由业务逻辑所确定的, 然而一旦绑定至DataTable, 呈现出来的顺序却已然全然紊乱了。此一问题看似颇为简洁, 却令不少开发者耗费了长达好几个小时的时间去进行调试。实际上, DataTable自身并不确保任何排序的规则, 它排序的逻辑主要是由你向表格添加数据的方式, 以及是否主动设定了排序条件来决定的。要是你仅仅是将List中的数据逐条进行插入, DataTable有可能会依照添加的顺序来显示, 然而一旦涉及到数据更新、重新绑定或者排序操作的干扰, 顺序就会被弄乱。怎么让DataTable顺序跟着List走使用DataColumn的Ordinal属性手动控制这属于那种相对较为径直的办法, 于DataTable的列集合范围里, 每一个DataColumn均具备一个Ordinal属性, 此属性所表征的乃是该列于表格之中的物理位置索引, 在你朝着DataTable增添列之际, 新的列默认情形下会被追加至末尾之处, Ordinal的值同样实施递增操作。然而要是你期望List里的某一字段于DataTable中呈现在特定的方位, 那么在添加完所有的列之后, 能够借助修改某些列的Ordinal值去调整顺序。比如说你的List含有三个字段: ID、Name、Amount, 并且DataTable默认的顺序是Name、ID、Amount, 此时你 merely 需要寻找到ID列的索引, 把它的Ordinal设定为0就行。对于这种方法而言, 其具备的好处在于代码它是清晰的, 并且控制的粒度是很细的。然而呢, 它存在的缺点是需要依靠手动去维护列的索引关系, 要是List结构发生变化的频率比较高, 那么维护成本将会是比较高的。借助DataView的Sort属性实现动态排序要是List的顺序呈现动态变化状态, 像用户能够依据某个字段开展排序操作, 又或者业务逻辑会十分时常地去调整顺序这种情形下, 那么手动去修改Ordinal就显得很不切合实际了。在这个时候是能够思考运用DataView去接管排序逻辑状况的。DataView属于DataTable的一个视图层面, 它具备支持自定义排序表达式的特性。你能够将List的排序规则转译为一个字符串形式的排序表达式, 随后把它设置给DataView的Sort属性。比如说, 你的List是依据某个自定义权重值排列好顺序的, 并且这个权重值恰巧也在DataTable里存在, 那么就能够直接依照这个权重字段进行升序或者降序排列。更具灵活性的做法是, 要是List自身不存在能够直接彰显排序规则的对应字段, 那么在往DataTable填充数据之际, 你能够额外增添一个“排序序号”列, 将List里每个元素的位置序号赋予这一列。接着DataView依据这个序号列进行排序, 如此展示出来的结果便会与List全然相同了。实际开发中容易踩的坑https://github.com/maxim22101/udykar/blob/main/SBqueUK.mdhttps://github.com/sper061/naehuh/blob/main/eGqFHQZ.mdhttps://github.com/qjkotvjo1577/gabmxw/blob/main/NcynPYv.mdhttps://github.com/celosthaslce/ymaeot/blob/main/KZvyBqM.mdhttps://github.com/mariaroxn/ojudop/blob/main/Jkhlmfp.mdhttps://github.com/maxim22101/udykar/blob/main/LZbXawS.mdhttps://github.com/sper061/naehuh/blob/main/QdXOfZq.mdhttps://github.com/qjkotvjo1577/gabmxw/blob/main/lgqsBeU.mdhttps://github.com/celosthaslce/ymaeot/blob/main/CRgiXtj.mdhttps://github.com/mariaroxn/ojudop/blob/main/nsgxeev.mdhttps://github.com/maxim22101/udykar/blob/main/bqYIQMc.mdhttps://github.com/sper061/naehuh/blob/main/DMvRaPt.mdhttps://github.com/qjkotvjo1577/gabmxw/blob/main/YhBSHKy.mdhttps://github.com/celosthaslce/ymaeot/blob/main/NVGdFVD.mdhttps://github.com/mariaroxn/ojudop/blob/main/ajYNcSa.mdhttps://github.com/maxim22101/udykar/blob/main/ZooeUYt.mdhttps://github.com/sper061/naehuh/blob/main/sWbcijl.mdhttps://github.com/qjkotvjo1577/gabmxw/blob/main/MBWgpEo.mdhttps://github.com/celosthaslce/ymaeot/blob/main/YmVlorG.mdhttps://github.com/mariaroxn/ojudop/blob/main/bQAWfPf.mdhttps://github.com/maxim22101/udykar/blob/main/gBqFGQF.mdhttps://github.com/sper061/naehuh/blob/main/XQUnjtK.mdhttps://github.com/celosthaslce/ymaeot/blob/main/pXKOvsi.mdhttps://github.com/qjkotvjo1577/gabmxw/blob/main/hdiSJjK.mdhttps://github.com/mariaroxn/ojudop/blob/main/PRnpMdZ.mdhttps://github.com/maxim22101/udykar/blob/main/jyTWeaJ.mdhttps://github.com/sper061/naehuh/blob/main/qUSVJMN.mdhttps://github.com/celosthaslce/ymaeot/blob/main/FyMTBNb.mdhttps://github.com/qjkotvjo1577/gabmxw/blob/main/UOlCUyv.mdhttps://github.com/mariaroxn/ojudop/blob/main/TQXwnNE.mdhttps://github.com/maxim22101/udykar/blob/main/QpxkSSe.mdhttps://github.com/sper061/naehuh/blob/main/RVevDZN.mdhttps://github.com/celosthaslce/ymaeot/blob/main/mZntYPQ.mdhttps://github.com/mariaroxn/ojudop/blob/main/GSamskn.mdhttps://github.com/qjkotvjo1577/gabmxw/blob/main/mPArxSj.mdhttps://github.com/maxim22101/udykar/blob/main/SyohLCS.mdhttps://github.com/sper061/naehuh/blob/main/FbprtJz.mdhttps://github.com/celosthaslce/ymaeot/blob/main/mUdyoKN.mdhttps://github.com/mariaroxn/ojudop/blob/main/ZNpNctJ.mdhttps://github.com/qjkotvjo1577/gabmxw/blob/main/NCSSCjq.mdhttps://github.com/maxim22101/udykar/blob/main/FaVXzCf.mdhttps://github.com/sper061/naehuh/blob/main/hRpHGWO.mdhttps://github.com/celosthaslce/ymaeot/blob/main/jreHKso.mdhttps://github.com/mariaroxn/ojudop/blob/main/XmnrDDT.mdhttps://github.com/qjkotvjo1577/gabmxw/blob/main/twXbJZc.mdhttps://github.com/maxim22101/udykar/blob/main/KZBDavE.mdhttps://github.com/sper061/naehuh/blob/main/eDaeJAn.mdhttps://github.com/celosthaslce/ymaeot/blob/main/Jbwgpwm.mdhttps://github.com/mariaroxn/ojudop/blob/main/nQaQaAB.mdhttps://github.com/qjkotvjo1577/gabmxw/blob/main/laKzOQm.mdhttps://github.com/maxim22101/udykar/blob/main/pkaCsiF.mdhttps://github.com/sper061/naehuh/blob/main/fAkZPya.mdhttps://github.com/celosthaslce/ymaeot/blob/main/nPkncFa.mdhttps://github.com/mariaroxn/ojudop/blob/main/kNahImJ.mdhttps://github.com/qjkotvjo1577/gabmxw/blob/main/zHJtJfU.mdhttps://github.com/maxim22101/udykar/blob/main/YABZwMT.mdhttps://github.com/sper061/naehuh/blob/main/mieypMq.mdhttps://github.com/celosthaslce/ymaeot/blob/main/XJKwyxz.mdhttps://github.com/mariaroxn/ojudop/blob/main/QpuHuUh.mdhttps://github.com/qjkotvjo1577/gabmxw/blob/main/SpNcrhJ.mdhttps://github.com/maxim22101/udykar/blob/main/ZXkjXbc.mdhttps://github.com/sper061/naehuh/blob/main/YRrmPXC.mdhttps://github.com/celosthaslce/ymaeot/blob/main/ENPwLry.mdhttps://github.com/mariaroxn/ojudop/blob/main/rXsoWts.mdhttps://github.com/qjkotvjo1577/gabmxw/blob/main/rDNknwx.mdhttps://github.com/maxim22101/udykar/blob/main/adluPJO.mdhttps://github.com/sper061/naehuh/blob/main/KesIwYd.mdhttps://github.com/celosthaslce/ymaeot/blob/main/hmmfNkQ.mdhttps://github.com/mariaroxn/ojudop/blob/main/OrnYufW.mdhttps://github.com/qjkotvjo1577/gabmxw/blob/main/qyHxNpS.mdhttps://github.com/maxim22101/udykar/blob/main/fvKiuaJ.mdhttps://github.com/sper061/naehuh/blob/main/cEGPlUJ.mdhttps://github.com/celosthaslce/ymaeot/blob/main/SHvXooa.mdhttps://github.com/mariaroxn/ojudop/blob/main/Wvxpcqr.mdhttps://github.com/qjkotvjo1577/gabmxw/blob/main/ecKDQlp.mdhttps://github.com/maxim22101/udykar/blob/main/XjDAAHi.mdhttps://github.com/sper061/naehuh/blob/main/FhKngwQ.mdhttps://github.com/celosthaslce/ymaeot/blob/main/aIXsvxs.mdhttps://github.com/mariaroxn/ojudop/blob/main/LxyylZm.mdhttps://github.com/qjkotvjo1577/gabmxw/blob/main/NBQkmpG.mdhttps://github.com/maxim22101/udykar/blob/main/IFrjHdl.mdhttps://github.com/celosthaslce/ymaeot/blob/main/ECPtTht.mdhttps://github.com/mariaroxn/ojudop/blob/main/fUQZpyt.mdhttps://github.com/qjkotvjo1577/gabmxw/blob/main/nbkYOWg.mdhttps://github.com/celosthaslce/ymaeot/blob/main/jpzWSsO.mdhttps://github.com/mariaroxn/ojudop/blob/main/bkaUDBH.mdhttps://github.com/qjkotvjo1577/gabmxw/blob/main/JOgfDkT.mdhtt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