C# 自动映射显示错误“；指定的强制转换无效；

使用模型映射DataTable时出错

这是我的密码

       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();
        }

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[[SkillKindle.BLL.Feedbacks.ExcelFeedbackRecord，
SkillKindle.BLL，版本=1.0.0.0，区域性=中性，
PublicKeyToken=null]]。类型为的异常
“AutoMapper.AutoMappingException”被抛出。]

AutoMapper.MappingEngine.AutoMapper.IMappingEngineRunner.Map（ResolutionContext
上下文）+433 AutoMapper.MappingEngine.Map（对象源，类型
sourceType，Type destinationType，Action

1选项）+353
AutoMapper.MappingEngine.Map（TSource-source）+564
AutoMapper.Mapper.Map（TSource源）+461
SkillKindleAdmin.Controllers.FeedbackController.ExcelUpload（HttpPostedFileBase 文件）在d:\Skill中 在线\trunk\SkillKindleAdmin\Controllers\FeedbackController.cs:57
lambda_方法（闭包、控制器库、对象[]）+107
System.Web.Mvc.ActionMethodDispatcher.Execute（ControllerBase 控制器，对象[]参数）+286
System.Web.Mvc.ReflectedActionDescriptor.Execute（ControllerContext controllerContext，IDictionary

2参数）+655

System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod（ControllerContext
controllerContext，ActionDescriptor ActionDescriptor，IDictionary

2 参数）+326
System.Web.Mvc.Async.AsyncControllerActionInvoker.InvokeSynchronousActionMethod（ControllerContext controllerContext，ActionDescriptor ActionDescriptor，IDictionary

2
参数）+317

System.Web.Mvc.Async.c__DisplayClass42.b__41（）
+219 System.Web.Mvc.Async.c__显示类8

1.b__7（IAsyncResult )+275 System.Web.Mvc.Async.WrappedAsyncResult

1.End（）+328 System.Web.Mvc.Async.AsyncResultRapper.End（IAsyncResult asyncResult，
对象标记）+492

System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeActionMethod（IAsyncResult
异步结果）+261

System.Web.Mvc.Async.c__显示类39.b__33（）
+268 System.Web.Mvc.Async.c__显示类4f.b__49（）
+461 System.Web.Mvc.Async.c_uudisplayClass37.b_uu36（IAsyncResult asyncResult）+235 System.Web.Mvc.Async.WrappedAsyncResult

1.End（） +328 System.Web.Mvc.Async.AsyncResultRapper.End（IAsyncResult asyncResult，对象标记）+492
System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeActionMethodWithFilters（IAsyncResult 异步结果）+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（）
+316 System.Web.Mvc.Async.AsyncResultRapper.End（IAsyncResult asyncResult，对象标记）+387

System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeAction（IAsyncResult
异步结果）+285

System.Web.Mvc.c__;u displayClassId.b_;u 18（IAsyncResult
异步结果）+234

System.Web.Mvc.Async.c\uuu DisplayClass4.b\uu 3（IAsyncResult
ar）+275 System.Web.Mvc.Async.WrappedAsyncResult

1.End（）+333
System.Web.Mvc.Async.AsyncResultRapper.End（IAsyncResult asyncResult， 对象标记）+397
System.Web.Mvc.Async.AsyncResultRapper.End（IAsyncResult asyncResult， 对象标记）+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.AsyncResultRapper.End（IAsyncResult asyncResult，
对象标记）+397

System.Web.Mvc.Async.AsyncResultRapper.End（IAsyncResult asyncResult，
对象标记）+266 System.Web.Mvc.Controller.EndExecute（IAsyncResult
异步结果）+254

System.Web.Mvc.Controller.System.Web.Mvc.Async.IAsyncController.EndExecute（IAsyncResult
异步结果）+226

System.Web.Mvc.c_uuudisplayClass8.b_uuu3（IAsyncResult
异步结果）+230

System.Web.Mvc.Async.c\uuu DisplayClass4.b\uu 3（IAsyncResult
ar）+275 System.Web.Mvc.Async.WrappedAsyncResult

1.End（）+333
System.Web.Mvc.Async.AsyncResultRapper.End（IAsyncResult asyncResult， 对象标记）+397
System.Web.Mvc.Async.AsyncResultRapper.End（IAsyncResult asyncResult， 对象标记）+266
System.Web.Mvc.MvcHandler.EndProcessRequest（IAsyncResult asyncResult） +255 System.Web.Mvc.MvcHandler.System.Web.IHTTPassynchandler.EndProcessRequest（IAsyncResult 结果）+225
System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute（） +1086 System.Web.HttpApplication.ExecuteStep（IExecutionStep步骤，布尔值&同步完成）+603

---

您确定datareader返回的列与对象ExcelFeedbackRecord中的属性字段（包括大小写）完全匹配吗？

---

如果没有，则在创建映射时必须添加配置。

问题是，当我们使用模型映射数据集时，模型的所有属性必须仅为字符串类型，然后您可以使用automapper的CustomTypeConversion方法。

首先感谢您的帮助，是的，列与属性字段完全匹配，但不是字符串类型。现在是固定的

       [InvalidCastException: Specified cast is not valid.]    DynamicCreate(IDataRecord ) +1673