问

.NET更改内循环时循环的次数

lovely叫我龙哥发布于 2023-01-09 18:27

我正在调查如何在循环内部修改循环结束值.这是.NET2代码(我正在使用VB).我明白这不太理想,但可以做到吗？

'inital value is 31
Dim currentNumberOfRowsInDataTable As Int32 = dataTable.Rows.Count - 1

For i As Integer = 0 To currentNumberOfRowsInDataTable
    Try
        If (dataTable.Rows(i)("DataItemSection") = "Platforms") Then
            Dim newRow As DataRow = rearrangedDataTable.NewRow()

            'do stuff

            dataTable.Rows.RemoveAt(i)
            'decrement to 30, however this has no influence on the loop
            currentNumberOfRowsInDataTable -= 1
        End If
    Catch
        'problem is that loop always goes to 31, whereas I want it to go to 30
        'so need to swallow the exception here
    End Try
Next

编辑 - 这里有C#代码,但是因为它没有产生相同的行为而取出它.

1 个回答

如果你在循环中从List中删除某些东西,你应该从最后开始.C#:
```
for (int i = currentNumberOfRowsInDataTable - 1; i >= 0; --i) {
  //the rest here
}
```
引用:
```
//decrement to 30, however this has no influence on the loop
currentNumberOfRowsInDataTable -= 1;
```
结束报价

这将影响循环.但是,如果你从最后开始,整个问题就会消失.
2023-01-09 18:31 回答

DTor惜涵_237

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