.net 在LINQ Select子句中重置索引
我的LINQ查询:.net 在LINQ Select子句中重置索引,.net,vb.net,linq,linq-to-objects,.net,Vb.net,Linq,Linq To Objects,我的LINQ查询: Dim groupedData = (From p In pData _ Group By p.TruncParam Into Group) _ .SelectMany(Function(g) g.Group) _ .Select(Function(d, idx) New With { _ .NewParameter = S
Dim groupedData = (From p In pData _
Group By p.TruncParam Into Group) _
.SelectMany(Function(g) g.Group) _
.Select(Function(d, idx) New With { _
.NewParameter = String.Concat(If(d.TruncParam.Length < 5, d.TruncParam, d.TruncParam.Substring(0, 5)), idx.ToString("0000")), _
.FullParameter = String.Format("{0}-{1} [{2}] <{3}>", d.LabName, d.TestName, d.Parameter, d.Unit)})
Dim groupedData=(来自pData中的p_
按p.TruncParam分组(分为组)_
.选择多个(功能(g)g.组)_
.用{_
.NewParameter=String.Concat(如果(d.TruncParam.Length<5,d.TruncParam,d.TruncParam.Substring(0,5)),idx.ToString(“0000”)_
.FullParameter=String.Format(“{0}-{1}[{2}]”,d.LabName,d.TestName,d.Parameter,d.Unit)})
产生以下结果:
ID: SOLUB0000 Name: 001-AMT SOLUBL [SOLUBLES] <%>
ID: SOLUB0001 Name: CHEM-C4:SOL [SOLUBLES] <%>
ID: SOLUB0002 Name: CHEM-EMCARB:SOL [SOLUBLES] <%>
ID: INSOL0003 Name: 001-AMT:INSOL [INSOLUBLES] <%>
ID: INSOL0004 Name: CHEM-AMT:INSOL [INSOLUBLES] <%>
ID: INSOL0005 Name: CHEM-W:INSOL [INSOLUBLES] <%>
ID: INSOL0006 Name: CHEM-W:INSOL [INSOLUBLES] <mg/l>
ID: CLRES0007 Name: 001-CL RESIDUE [CL RESIDUE] <ppm>
ID: SUMCA0008 Name: 001-ELEMENTS [SUM CA K NA SI] <%>
ID: SUMME0009 Name: 001-ELEMENTS [SUM METALS + P] <%>
ID:SOLUB0000名称:001-AMT SOLUBL[SOLUBLES]
ID:SOLUB0001名称:CHEM-C4:SOL[SOLUBLES]
ID:SOLUB0002名称:CHEM-EMCARB:SOL[SOLUBLES]
ID:INSTA0003名称:001-AMT:INSTAL[不溶物]
ID:INSTA0004名称:CHEM-AMT:INSTAL[不溶物]
ID:INFOR0005名称:CHEM-W:INFORI[不溶物]
ID:INSTA0006名称:CHEM-W:INSTAL[不溶物]
ID:CLRES0007名称:001-CL残留物[CL残留物]
ID:SUMCA0008名称:001-元素[SUM CA K NA SI]
ID:SUMME0009名称:001-元素[SUM金属+P]
当TruncParam
更改时,我希望Select
子句中的索引(idx
)重置为1。因此,在上面的列表中,索引应该是SOLUB0001
,SOLUB0002
,insin0001
,insin0002
,CLRES0001
,SUMCA0001
,sume001
如何更改LINQ查询?您需要在
SelectMany
语句(g.Group.Select(d,idx)=>new{d,idx}
中移动索引选择,如下所示:
Dim groupedData = (From p In pData _
Group By p.TruncParam Into Group) _
.SelectMany(Function(g) g.Group.Select(Function(d, idx) New With { _
.Element = d, .Index = idx}) _
.Select(Function(d) New With { _
.NewParameter = String.Concat(If(d.Element.TruncParam.Length < 5, d.Element.TruncParam, d.Element.TruncParam.Substring(0, 5)), d.Index.ToString("0000")), _
.FullParameter = String.Format("{0}-{1} [{2}] <{3}>", d.Element.LabName, d.Element.TestName, d.Element.Parameter, d.Element.Unit)})
Dim groupedData=(来自pData中的p_
按p.TruncParam分组(分为组)_
.SelectMany(函数(g)g.Group.Select(函数(d,idx)用{_
.Element=d,.Index=idx})_
.用{_
.NewParameter=String.Concat(如果(d.Element.TruncParam.Length<5,d.Element.TruncParam,d.Element.TruncParam.Substring(0,5)),d.Index.ToString(“0000”)_
.FullParameter=String.Format(“{0}-{1}[{2}]”,d.Element.LabName,d.Element.TestName,d.Element.Parameter,d.Element.Unit)})