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我在我的项目中使用了 MultiSelect DropDownList。当用户从 DropDownList 中选择值时,我想生成一个图表。我有两个 Y 轴并为此制作了 MultiSelect DropDownList。如何为图表选择多个值?用户选择两个值,它们代表图表的 2 个 Y 轴。