Question

C# 给datagridview赋值有时会报错：Specified argument was out of the range of valid values

System.ArgumentOutOfRangeException: Specified argument was out of the range of valid values.
Parameter name: e.RowIndex
at System.Windows.Forms.DataGridView.OnCellFormatting(DataGridViewCellFormattingEventArgs e)
at System.Windows.Forms.DataGridView.OnCellFormatting(Int32 columnIndex, Int32 rowIndex, Object val, Type formattedValueType, DataGridViewCellStyle cellStyle)
at System.Windows.Forms.DataGridViewCell.GetFormattedValue(Object value, Int32 rowIndex, DataGridViewCellStyle& cellStyle, TypeConverter valueTypeConverter, TypeConverter formattedValueTypeConverter, DataGridViewDataErrorContexts context)
at System.Windows.Forms.DataGridViewCell.GetFormattedValue(Int32 rowIndex, DataGridViewCellStyle& cellStyle, DataGridViewDataErrorContexts context)
at System.Windows.Forms.DataGridViewTextBoxCell.GetPreferredSize(Graphics graphics, DataGridViewCellStyle cellStyle, Int32 rowIndex, Size constraintSize)
at System.Windows.Forms.DataGridViewCell.GetPreferredHeight(Int32 rowIndex, Int32 width)
at System.Windows.Forms.DataGridViewCell.OnCellDataAreaMouseEnterInternal(Int32 rowIndex)
at System.Windows.Forms.DataGridViewCell.OnMouseMoveInternal(DataGridViewCellMouseEventArgs e)
at System.Windows.Forms.DataGridView.OnCellMouseMove(DataGridViewCellMouseEventArgs e)
at System.Windows.Forms.DataGridView.UpdateMouseEnteredCell(HitTestInfo hti, MouseEventArgs e)

Answer 1

错误信息是【指定的参数超出了合法值的范围，参数名：e.RowIndex】

检查一下你这个 e.RowIndex 是不是有时会变成负数或者比 Int32 范围大了？

追问

代码中的e.RowIndex只会双击事件才会触发，弹出新的winform就出错了，应该还没用到这个参数