automapper顯示錯誤「指定的轉換無效」。錯誤

這裏映射數據表是我的代碼

 if (file.ContentLength > 0) 
     { 
      var extension = Path.GetExtension(file.FileName); 
      if (extension != null && extension.ToLower() != ".xlsx") 
      { 
       return "please upload file with extension .xlsx"; 
      } 

      Stream stream = file.InputStream; 
      IExcelDataReader excelReader = ExcelReaderFactory.CreateOpenXmlReader(stream); 
      excelReader.IsFirstRowAsColumnNames = true; 
      DataSet result = excelReader.AsDataSet(); 
      if (result.Tables.Count > 0) 
      { 
       Mapper.Reset(); 
       Mapper.CreateMap<IDataReader, ExcelFeedbackRecord>(); 

       var results = Mapper.Map<IDataReader, IList<ExcelFeedbackRecord>>(result.Tables[0].CreateDataReader()); 

      } 
      return result.Tables[0].Rows.Count.ToString(); 
     }

堆棧跟蹤低於

 [InvalidCastException: Specified cast is not valid.] DynamicCreate(IDataRecord) +1673 
AutoMapper.Mappers.DataReaderMapper.Map（ ResolutionContext上下文， IMappingEngineRunner映射器）+433
AutoMapper.MappingEngine.AutoMapper.IMa ppingEngineRunner.Map（ResolutionContext 上下文）347

[AutoMapperMappingException：試圖System.Data.IDataReader映射到 System.Collections.Generic.IList 1[[SkillKindle.BLL.Feedbacks.ExcelFeedbackRecord, SkillKindle.BLL, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]]. Exception of type 'AutoMapper.AutoMapperMappingException' was thrown.] AutoMapper.MappingEngine.AutoMapper.IMappingEngineRunner.Map(ResolutionContext context) +433 AutoMapper.MappingEngine.Map(Object source, Type sourceType, Type destinationType, Action 1 OPTS）353
AutoMapper.MappingEngine.Map（TSource源）564
AutoMapper.Mapper.Map（TSource源）461
SkillKindleAdmin.Controllers.FeedbackController.ExcelUpload（HttpPostedFileBase 文件）在d：\技能在線\樹幹\ SkillKindleAdmin \控制器\ FeedbackController.cs：57
lambda_method（Closure，ControllerBase，Object []） 107
System.Web.Mvc.ActionMethodDispatcher.Execute（ControllerBase 控制器，對象[]參數）286
System.Web.Mvc.ReflectedActionDescriptor.Execute（ControllerContext controllerContext，IDictionary的參數）326
System.Web.Mvc.Async.AsyncControllerActionInvoker.InvokeSynchronousActionMethod（controllerContext controllerContext，ActionDescriptor actionDescriptor，IDictionary的2 parameters) +317 System.Web.Mvc.Async.<>c__DisplayClass42.<BeginInvokeSynchronousActionMethod>b__41() +219 System.Web.Mvc.Async.<>c__DisplayClass8 1.b__7（IAsyncResult的）275 System.Web.Mvc.Async.WrappedAsyncResult 1.End() +328 System.Web.Mvc.Async.AsyncResultWrapper.End(IAsyncResult asyncResult, Object tag) +492 System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeActionMethod(IAsyncResult asyncResult) +261 System.Web.Mvc.Async.<>c__DisplayClass39.<BeginInvokeActionMethodWithFilters>b__33() +268 System.Web.Mvc.Async.<>c__DisplayClass4f.<InvokeActionMethodFilterAsynchronously>b__49() +461 System.Web.Mvc.Async.<>c__DisplayClass37.<BeginInvokeActionMethodWithFilters>b__36(IAsyncResult asyncResult) +235 System.Web.Mvc.Async.WrappedAsyncResult 1.End（） 328 System.Web.Mvc.Async.AsyncResultWrapper.End（IA syncResult asyncResult，對象標籤）492個
System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeActionMethodWithFilters（IAsyncResult的 asyncResult）262
System.Web.Mvc.Async。 <> c _DisplayClass2a.b_ 20（） +203 System.Web.Mvc.Async。 <>Ç _DisplayClass25.b_ 22（IAsyncResult的 asyncResult）392 System.Web.Mvc.Async.WrappedAsyncResult 1.End() +316 System.Web.Mvc.Async.AsyncResultWrapper.End(IAsyncResult asyncResult, Object tag) +387 System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeAction(IAsyncResult asyncResult) +285 System.Web.Mvc.<>c__DisplayClass1d.<BeginExecuteCore>b__18(IAsyncResult asyncResult) +234 System.Web.Mvc.Async.<>c__DisplayClass4.<MakeVoidDelegate>b__3(IAsyncResult ar) +275 System.Web.Mvc.Async.WrappedAsyncResult 1.End（）333
System.Web.Mvc.Async.AsyncResultWrapper.End（IAsyncResult的asyncResult，對象標籤）397
System.Web.Mvc.Async.AsyncResultWrapper.End（IAsyncResult的asyncResult，對象標籤）266
System.Web.Mvc.Controller.EndExecuteCore（IAsyncResult的asyncResult） 253的System.Web .Mvc.Async。 <>Ç _DisplayClass4.b__3（IAsyncResult的 AR）275 System.Web.Mvc.Async.WrappedAsyncResult 1.End() +333 System.Web.Mvc.Async.AsyncResultWrapper.End(IAsyncResult asyncResult, Object tag) +397 System.Web.Mvc.Async.AsyncResultWrapper.End(IAsyncResult asyncResult, Object tag) +266 System.Web.Mvc.Controller.EndExecute(IAsyncResult asyncResult) +254 System.Web.Mvc.Controller.System.Web.Mvc.Async.IAsyncController.EndExecute(IAsyncResult asyncResult) +226 System.Web.Mvc.<>c__DisplayClass8.<BeginProcessRequest>b__3(IAsyncResult asyncResult) +230 System.Web.Mvc.Async.<>c__DisplayClass4.<MakeVoidDelegate>b__3(IAsyncResult ar) +275 System.Web.Mvc.Async.WrappedAsyncResult 1.End（）333
System.Web.Mvc.Async.AsyncResultWrapper.End（IAsyncResult的asyncResult，對象標籤）+397
System.Web.Mvc.Async.AsyncResultWrapper。端（IAsyncResult的asyncResult，對象標籤）266
System.Web.Mvc.MvcHandler.EndProcessRequest（IAsyncResult的asyncResult） 255 System.Web.Mvc.MvcHandler.System.Web.IHttpAsyncHandler.EndProcessRequest（IAsyncResult的結果）+ 225
System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute（） 1086 System.Web.HttpApplication.ExecuteStep（IExecutionStep一步，布爾& completedSynchronously）+603

來源

2013-05-14 rajansoft1

你確定數據讀取器返回的列與對象ExcelFeedbackRecord，inc。中的屬性字段完全匹配魯丁套管？如果不是，則創建地圖時必須添加配置。

來源

2013-05-14 15:48:07 rivarolle

首先感謝您的幫助，是的列完全匹配屬性字段，但它不是字符串類型。現在它是固定的 – rajansoft1 2013-05-15 05:04:23

那麼問題是，當我們將DataSet與模型映射時，模型的所有屬性都必須是字符串類型，然後才能使用automapper的CustomTypeConversion方法。

來源

2013-05-15 05:02:39 rajansoft1

automapper顯示錯誤「指定的轉換無效」。錯誤

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