该指数超出界限。它不能是负数，必须小于集合的大小。 [英] The index was out of bounds. It must not be negative and must be smaller than the size of the collection.

问题描述

我收到此错误" 索引超出范围。它不能是负数，必须小于集合的大小。"

I get this Error " The index was out of bounds. It must not be negative and must be smaller than the size of the collection."

这是我的代码：

    Private Sub ShowSevragesByCage()
        If Not String.IsNullOrEmpty(CmbCages.Text) Then
            _bsc2.DataSource = opsd.NetSevragesByCage(CmbCages.Text)
            Dgv.DataSource = _bsc2
            Dgv.ExpandColumns()
        End If
        ' Sum
        Dim Sum As Integer = 0
        For i As Integer = 0 To Dgv.Rows.Count - 1 - 1
            Sum += Convert.ToInt32(Dgv.Rows(i).Cells(4).Value)
        Next

      Dgv（" NetDesSevrages"，Dgv.Rows.Count - 1）.Value = Sum

     Dgv("NetDesSevrages", Dgv.Rows.Count - 1).Value = Sum

End sub

End sub

<问题是在最后一行，而不是Sub运行。

The problem is in the last line , whithout it the Sub run .

  Dgv("NetDesSevrages", Dgv.Rows.Count - 1).Value = Sum

没有最后一行：

Without the last line:

非常感谢你。

最诚挚的问候。

推荐答案

尝试使用 

Try using 

Dim Test As Integer = Dgv.Rows.Count - 1

Dim Test As Integer = Dgv.Rows.Count - 1

在该行上设置断点以查看Test的值是什么。

Put a breakpoint on that line to see what the value of Test is.

此

对于i as Integer = 0 To Dgv .Rows.Count - 1 - 1

For i As Integer = 0 To Dgv.Rows.Count - 1 - 1

应该是

对于i as Integer = 0到Dgv.Rows.Count - 1 

For i As Integer = 0 To Dgv.Rows.Count - 1 

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