'DataVisualization' does not exist in the namespace 'System.Web.UI'一例解決辦法

阿新 • • 發佈：2018-12-15

之前專案是vs2010 aspx專案，用vs2017開啟後

有一行錯誤：CS0234 C# The type or namespace name 'DataVisualization' does not exist in the namespace 'System.Web.UI' (are you missing an assembly reference?)

每個頁面開啟都會有一行這個錯誤，執行時正常，強迫症不能忍。

在網上查了各種解決辦法，一天沒解決，最後無意間切換了一次.net版本，先由4.0切換為一個其它版本比如4.5再切換為4.0就不再報錯了。

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'DataVisualization' does not exist in the namespace 'System.Web.UI'一例解決辦法

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