The type or namespace name 'Html' does not exist in the namespace 'System.Web.Mvc' (are you missing an assembly reference?) solution: right click on reference system.web.mvc, toggle "Copy local" to "true".…

我在 项目 下面创建一个 App_Code的文件夹,然后在其下创建自定义的类,但是当我在该项目下别的地方使用时报错: The type or namespace name 'App_Code' does not exist in the namespace 'xxx' (are you missing an assembly reference?) 解决方案: 1,在创建的类上右键,选择 Properties,如图: 2,将 Build Action 属性设置为 Compile,如图: 即可.…

应该说是 .net4 的bug,没有所谓的 System.Web.Extensions.dll 库文件,需要将项目的 Target Framework修改为 3.5版本,才能加载System.Web.Extensions.dll库文件. 我在使用 System.Web.Script.Serialization.JavaScriptSerializer 类解析嵌套的json时)用到.…

在WebConfig里 找到 <pages></pages> <pages pageParserFilterType="System.Web.Mvc.ViewTypeParserFilter, System.Web.Mvc, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" pageBaseType="System.Web.Mvc.ViewPage, System…

之前项目是vs2010 aspx项目,用vs2017打开后,非运行状态下有一行错误:CS0234 C# The type or namespace name 'DataVisualization' does not exist in the namespace 'System.Web.UI' (are you missing an assembly reference?) 每个页面打开都会有一行这个错误,运行时正常,强迫症不能忍. 在网上查了各种解决办法,比如添加引用之类的,都无法解决,最后无意…

Error 139 Assembly 'System.Activities.Core.Presentation' was not found. Verify that you are not missing an assembly reference. Also, verify that your project and all referenced assemblies have been built. EnumerationTestDesigner.xaml 6 17 LoganTestsE…

错误的提升内容:…

错误:foreach statement cannot operate on variables of type 'System.Web.UI.WebControls.Table' because 'System.Web.UI.WebControls.Table' does not contain a public definition for 'GetEnumerator' foreach (TableRow tr in table) {   ... } 修改为 foreach (TableR…

which type of VS files should be committed into a version control system? aps, no: last resource editor state cpp, yes: source code exe, no: build result filters, yes: project file h, yes: source code ico, yes: resource idb, no: build state ipch, no:…

错误 10 The tag 'DataGridTextColumn' does not exist in XML namespace 'http://schemas.microsoft.com/winfx/2006/xaml/presentation/sdk'. F:\项目\基于手机信令的城市规划大数据分析系统\6.系统开发\CellDataCityPlanningApplication\BrightData.CellData.CityPlanning.TripInfo\TripAnalyseB…