[求助]ArcEngine删除图层时值不在预期的范围内

<P>我的代码如下：</P>
<P>Dim i As Integer<BR>        For i= 0 To AxMapControl1.LayerCount - 1<BR>            If AxMapControl1.Map.Layer(i).Name = "tushifang" Then<BR>                Dim layer As ILayer = AxMapControl1.get_Layer(i)<BR>                AxMapControl1.Map.DeleteLayer(layer)<BR>            End If<BR>        Next<BR>在If AxMapControl1.Map.Layer(i).Name = "tushifang" Then就会出现"值不在预期的范围内"的错误，这是怎么回事，实在搞不懂？</P>