Linq 使用接受实体框架核心3.1.10时出现异常
以下是我尝试执行的查询:Linq 使用接受实体框架核心3.1.10时出现异常,linq,asp.net-core,linq-to-sql,entity-framework-core,pomelo-entityframeworkcore-mysql,Linq,Asp.net Core,Linq To Sql,Entity Framework Core,Pomelo Entityframeworkcore Mysql,以下是我尝试执行的查询: var contests = await _dbContext.Contests.Include(o => o.Winner) .Where(o=>o.Ended!=null) .Select(c => new { Contest = c, Strings = _dbConte
var contests = await _dbContext.Contests.Include(o => o.Winner)
.Where(o=>o.Ended!=null)
.Select(c => new
{
Contest = c,
Strings = _dbContext.ContestCountryStrings.Where(o=>o.ContestId==c.Id && (o.Country.Equals(language) || o.Country.Equals("Default"))).ToList()
}).Take(3).ToListAsync();
这些是实体:
[Table("Contests")]
public class Contest
{
public int Id { get; set; }
public DateTime DueTo { get; set; }
public uint DurationInHours { get; set; }
public DateTime? Started { get; set; }
public DateTime? Ended { get; set; }
public int? WinnerId { get; set; }
public User Winner { get; set; }
public bool Recurrent { get; set; }
public string ImageUrl { get; set; }
}
[Table("ContestCountryStrings")]
public class ContestCountryString
{
public int Id { get; set; }
public int ContestId { get; set; }
public Contest Contest { get; set; }
public string Country { get; set; }
public string Title { get; set; }
public string Description { get; set; }
}
执行时,我会得到如下异常:
失败:
Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware[1]
执行请求时发生未经处理的异常。System.InvalidOperationException:EF.属性调用错误
属性名。在
Microsoft.EntityFrameworkCore.Query.RelationalSqlTranslatingExpressionVisitor.VisitMethodCall(MethodCallExpression
methodCallExpression)位于
System.Linq.Expressions.MethodCallExpression.Accept(ExpressionVisitor
访客)在
System.Linq.Expressions.ExpressionVisitor.Visite(表达式节点)位于
Microsoft.EntityFrameworkCore.Query.RelationalSqlTranslatingExpressionVisitor.VisitBinary(二进制表达式
二进制表达式)在
Pomelo.EntityFrameworkCore.MySql.Query.ExpressionVisitors.Internal.MySqlSqlTranslatingExpressionVisitor.VisitBinary(二进制表达式
二进制表达式)在
System.Linq.Expressions.BinaryExpression.Accept(ExpressionVisitor
访客)在
System.Linq.Expressions.ExpressionVisitor.Visite(表达式节点)位于
Microsoft.EntityFrameworkCore.Query.RelationalSqlTranslatingExpressionVisitor.Translate(表达式
表达式)在
Microsoft.EntityFrameworkCore.Query.RelationalQueryableMethodTranslationExpressionVisitor.TranslateExpression(表达式
表达式)在
Microsoft.EntityFrameworkCore.Query.RelationalQueryableMethodTranslationExpressionVisitor.CreateJoinPredicate(表达式
outerKey,表达式innerKey)位于
Microsoft.EntityFrameworkCore.Query.RelationalQueryableMethodTranslationExpressionVisitor.CreateJoinPredicate(ShapedQueryExpression
外部,LambdaExpression outerKeySelector,ShapedQueryExpression内部,
LambdaExpression innerKeySelector)位于
Microsoft.EntityFrameworkCore.Query.RelationalQueryableMethodTranslationExpressionVisitor.TranslateLeftJoin(ShapedQueryExpression
外部、成形查询表达式内部、LambdaExpression外部查询选择器、,
LambdaExpression innerKeySelector,LambdaExpression resultSelector)在 Microsoft.EntityFrameworkCore.Query.QueryableMethodTranslationExpressionVisitor.VisitMethodCall(MethodCallExpression methodCallExpression)位于 Microsoft.EntityFrameworkCore.Query.RelationalQueryableMethodTranslationExpressionVisitor.VisitMethodCall(MethodCallExpression methodCallExpression)位于 System.Linq.Expressions.MethodCallExpression.Accept(ExpressionVisitor 访客)在 System.Linq.Expressions.ExpressionVisitor.Visite(表达式节点)位于 Microsoft.EntityFrameworkCore.Query.QueryableMethodTranslationExpressionVisitor.VisitMethodCall(MethodCallExpression methodCallExpression)位于 Microsoft.EntityFrameworkCore.Query.RelationalQueryableMethodTranslationExpressionVisitor.VisitMethodCall(MethodCallExpression methodCallExpression)位于 System.Linq.Expressions.MethodCallExpression.Accept(ExpressionVisitor 访客)在 System.Linq.Expressions.ExpressionVisitor.Visite(表达式节点)位于 Microsoft.EntityFrameworkCore.Query.QueryCompilationContext.CreateQueryExecutor[TResult](表达式 查询)在 Microsoft.EntityFrameworkCore.Storage.Database.CompileQuery[TResult](表达式 查询,布尔异步)在 Microsoft.EntityFrameworkCore.Query.Internal.QueryCompiler.CompileQueryCore[TResult](IDatabase 数据库、表达式查询、IModel模型、布尔异步 Microsoft.EntityFrameworkCore.Query.Internal.QueryCompiler.c_uu在Microsoft.EntityFrameworkCore.Query.Internal.CompiledQueryCache.GetOrAddQueryCore[TFunc](对象缓存键,Func1编译器)上显示Class12_0 Microsoft.EntityFrameworkCore.Query.Internal.CompiledQueryCache.GetOradQuery[TResult](对象 在Microsoft.EntityFrameworkCore.Query.Internal.QueryCompiler.ExecuteAsync[TResult](表达式查询,CancellationToken CancellationToken)的Microsoft.EntityFrameworkCore.Query.Internal.EntityQueryProvider.ExecuteAsync[TResult](表达式表达式,CancellationToken CancellationToken)在Microsoft.EntityFrameworkCore.Query.Internal.EntityQueryable中1.GetAsyncEnumerator(CancellationToken 取消令牌)在 System.Runtime.CompilerServices.ConfiguredCancelableAsyncEnumerable
1.GetAsyncEnumerator()位于Microsoft.EntityFrameworkCore.EntityFrameworkQueryableExtensions.ToListSync[TSource](IQueryable
1
源,CancellationToken CancellationToken)位于
MoneyAppBackend.Controllers.竞赛控制器。\u GetLas10PasteEvents(事件类型
输入,字符串语言)
/Users/juanjoseduran/Documents/Development/Projects/dotnet/MoneyAppBackend/MoneyAppBackend/Controllers/contesticscontroller.cs:line
106 at
MoneyAppBackend.Controllers.QuesticsController.GetAll(事件类型,
字符串lang,字符串uuid)在
/Users/juanjoseduran/Documents/Development/Projects/dotnet/MoneyAppBackend/MoneyAppBackend/Controllers/contesticscontroller.cs:line
57 at lambda_方法(闭合,对象)at
Microsoft.Extensions.Internal.ObjectMethodExecutorWaitiable.Waitier.GetResult()
在
Microsoft.AspNetCore.Mvc.Infrastructure.ActionMethodExecutor.AwaitableObjectResultExecutor.Execute(IActionResultTypeMapper
映射器,ObjectMethodExecutor,对象控制器,对象[]
(a)在
Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.g|u waiting | 12_0(ControllerActionInvoker
调用程序,ValueTask`1 actionResultValueTask)位于
Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.g|u waiting|10_0(ControllerActionInvoker
调用程序、任务lastTask、状态next、作用域、对象状态、布尔值
完成)在
Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Rethrow(ActionExecutedContextSealed
(上下文)在
Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Next(状态)&
接下来,在
Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.InvokeInnerFilterAsync()
---来自引发异常的上一个位置的堆栈结束跟踪-
var contests = await _dbContext.Contests.Include(o => o.Winner)
.Where(o=>o.Ended!=null).Take(3)
.Select(c => new
{
Contest = c,
Strings = _dbContext.ContestCountryStrings.Where(o=>o.ContestId==c.Id && (o.Country.Equals(language) || o.Country.Equals("Default"))).ToList()
}).ToListAsync();