主题：[求助]表达式列提取字符串

Dim t As Table = e.Table
For r As Integer = 0 To e.Table.Rows.Count - 1
    Dim TJ As String
    If t.Rows(r).IsNULL("保税") Then
        TJ = "[合金] = '" & t.Rows(r)("合金") & "' AND [保税] IS NULL"
    Else
        TJ = "[合金] = '" & t.Rows(r)("合金") & "' AND ([保税] = '" & t.Rows(r)("保税") & "' AND [保税] IS NOT NULL)"
    End If
   
    t.Rows(r)("期初结存") = Tables("热轧盘点表").Compute("Sum(重量)",TJ)    
Next

这段代码供你参考