0

将 DataTable 与模型映射时出现错误

这是我的代码

       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();
        }

错误的堆栈跟踪如下

       [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.IMappingEngineRunner.Map（ResolutionContext 上下文）+347

[AutoMapperMappingException：尝试将 System.Data.IDataReader 映射到 System.Collections.Generic.IList 1 个选项）+353 AutoMapper.MappingEngine.Map（TSource 源）+564 AutoMapper.Mapper.Map（TSource 源）+461 SkillKindleAdmin.Controllers。 d:\Skill Online\trunk\SkillKindleAdmin\Controllers\FeedbackController.cs 中的 FeedbackController.ExcelUpload(HttpPostedFileBase 文件):57 lambda_method(Closure, ControllerBase, Object[]) +107 System.Web.Mvc.ActionMethodDispatcher.Execute(ControllerBase 控制器, Object[] 参数）+286 System.Web.Mvc.ReflectedActionDescriptor.Execute（ControllerContext controllerContext，IDictionary 2 参数）+3261[[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





2 parameters) +655
System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary
System.Web.Mvc.Async.AsyncControllerActionInvoker.InvokeSynchronousActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary 1.b__7(IAsyncResult ) +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.EndInvokeActionMethodWithFilters(IAsyncResult asyncResult) +262 System.Web.Mvc.Async.<>c _DisplayClass2a.b_ 20() +203 System .Web.Mvc.Async.<>c _DisplayClass25.b_22 (IAsyncResult asyncResult) +392 System.Web.Mvc.Async.WrappedAsyncResult 1.End() +3332 parameters) +317
System.Web.Mvc.Async.<>c__DisplayClass42.<BeginInvokeSynchronousActionMethod>b__41() +219 System.Web.Mvc.Async.<>c__DisplayClass81.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() +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
System.Web.Mvc.Async.AsyncResultWrapper.End(IAsyncResult asyncResult, 对象标签) +397
System.Web.Mvc.Async.AsyncResultWrapper.End(IAsyncResult asyncResult, 对象标签) +266
System.Web.Mvc.Controller.EndExecuteCore( IAsyncResult asyncResult) +253 System.Web.Mvc.Async.<>c _DisplayClass4.b__3(IAsyncResult ar) +275 System.Web.Mvc.Async.WrappedAsyncResult 1.End() +333 System.Web.Mvc.Async.AsyncResultWrapper .End（IAsyncResult asyncResult，对象标记）+397 System.Web.Mvc.Async.AsyncResultWrapper.End（IAsyncResult asyncResult，对象标记）+266 System.Web.Mvc.MvcHandler.EndProcessRequest（IAsyncResult asyncResult）+255 System.Web。 Mvc.MvcHandler.System.Web.IHttpAsyncHandler.EndProcessRequest(IAsyncResult 结果) +2251.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



System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +1086 System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +603

4

2 回答 2

0

您确定数据读取器返回的列与对象 ExcelFeedbackRecord 中的属性字段完全匹配，包括大小写？如果不是，则必须在创建地图时添加配置。

于 2013-05-14T15:48:07.070 回答
0

那么问题是当我们用模型映射DataSet时，模型的所有属性都必须是字符串类型，然后你可以使用automapper的CustomTypeConversion方法。

于 2013-05-15T05:02:39.853 回答