在linq select中獲取記錄索引列

Question

我需要在我的select語句中獲取索引。

我的代碼：

IQueryable grpdRows; 
dtInput = ds.Tables[0]; 
grpdRows = dtInput 
    .Select("", "partno") 
    .AsQueryable() 
    .GroupBy("new (iif(it[\"partno\"] == null, \"\", it[\"partno\"]) as GrpKey1)","it") 
    .Select("new (it.Key.GrpKey1 as GrpKey1, it.Count() as TotalCount")"); 

如何讓指數在select語句例如：

.Select("new (it.Key.GrpKey1 as GrpKey1, it.Count() as TotalCount, **it.Index**")"); 

Answer 1

我不知道這是可能通過動態LINQ的，但作爲變通方法，您可以試一下像這樣：

IQueryable grpdRows; 
dtInput = ds.Tables[0]; 
grpdRows = dtInput 
    .Select("", "partno") 
    .AsQueryable() 
    .GroupBy("new (iif(it[\"partno\"] == null, \"\", it[\"partno\"]) as GrpKey1)","it") 
    .Select("new (it.Key.GrpKey1 as GrpKey1, it.Count() as TotalCount)"); 

var res = (from dynamic row in grpdRows 
      select row).Select((row,index)=>new {row.GrpKey1, row.TotalCount, Index=i});