DataTable中当前DataRow的索引-IndexofthecurrentDataRowinaDataTable

4  

If data is a List as you suggest, you can use a "for" loop rather than a "for each" loop:

如果数据是您建议的List ,则可以使用“for”循环而不是“for each”循环:

for i = 0 to data.Count - 1
    str.AppendLine(i & " " & data[i].UserName)
next

If, however, you're implying that your "data" list is not in the same order as the original DataTable's rows, you might be able to use the DataRowCollection.IndexOf method to locate the row in the original table:

但是,如果您暗示您的“数据”列表与原始DataTable的行的顺序不同,则可以使用DataRowCollection.IndexOf方法在原始表中找到该行:

for each dr as myDAL.UsersRow in data
    str.AppendLine(dr.Table.Rows.IndexOf(dr) & " " & dr.UserName)
next

1  

Declare a counter variable before the ForEach loop, and increment it inside it.

在ForEach循环之前声明一个计数器变量,并在其中增加它。

    Dim counter As Integer = 0
    For Each dr As myDAL.UsersRow In data
        counter = counter + 1
        str.AppendLine(counter.ToString() & " " & dr.UserName)
    Next