The type or namespace name 'DataVisualization' does not exist in the namespace 'System.Web.UI' (are you missing an assembly reference?)

Question

I added System.Web.DataVisualization in my references folder but when I try to use it in a view like this

 <img src="/Chart/CreateChart?chartType=@(System.Web.UI.DataVisualization.Charting.SeriesChartType.Column)"

I get this error

The type or namespace name 'DataVisualization' does not exist in the namespace 'System.Web.UI' (are you missing an assembly reference?)

It is, however, recognizable in my controller.

Answer 1

删除引用并重新添加。

Answer 2

我在我的项目的 bin 文件夹中复制了System.Web.DataVisualization.dll并且它确实有效。