The report definition is not valid. Details: The report definition has an invalid target namespace的问题依旧可以用如下方式解决

 

Web:

Install-Package Microsoft.ReportingServices.ReportViewerControl.WebForms

 

WinFrom:

Install-Package Microsoft.ReportingServices.ReportViewerControl.WinForms

此时winform的工具箱依旧没有对应的ReportViewer控件,打开当前项目下packages\Microsoft.ReportingServices.ReportViewerControl.Winforms.140.1000.523\lib\net40,把Microsoft.ReportViewer.WinForms.dll拖到工具栏内即可,So easy~

相关文档请参考:

ReportViewer 控件入门 | Microsoft Docs

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