[求助]查询与赋值并存 - 专家坐堂 - Foxtable(狐表) - 新一代数据库软件，完美融合Access、Foxpro、Excel、vb.net之优势，人人都能掌握的快速软件开发工具!

Dim Dic As new Dictionary(of DataRow, Integer)
Dim v As Double
For Each dr As DataRow In DataTables("表A").DataRows
    v = DataTables("表A").Compute("Count(第二列 )", "第二列 = " & dr("第一列"))
    dic.Add(dr, v)
Next
For Each dr As DataRow In dic.Keys
    dr("第四列") = dic(dr)
Next

这段代码中,为什么不将

Dim Dic As new Dictionary(of DataRow, Integer)

直接定义为

Dim Dic As new Dictionary(of DataRow, Double)

否则V是double,而字典定义为integer,可能会导致数据截短.

主题：[求助]查询与赋值并存