I have an error in the "EF Core" how fix it.
and how I can set the default value in SingleOrDefault(true)
this is my code
public bool IsBlockedCustomer(Guid userId) =>
_context.TUsers.Where(o => o.UserId == userId).Select(s => s.IsBlock).SingleOrDefault(true);
and when checking the system.linq lib and see I can use the default value when I convert TSource Queryable to ToList
/// <summary>Returns the only element of a sequence, or a default value if the sequence is empty; this method throws an exception if there is more than one element in the sequence.</summary>
/// <typeparam name="TSource">The type of the elements of <paramref name="source" />.</typeparam>
/// <param name="source">An <see cref="IEnumerable{T}" /> to return the single element of.</param>
/// <param name="defaultValue">The default value to return if the sequence is empty.</param>
/// <returns>The single element of the input sequence, or <paramref name="defaultValue" /> if the sequence contains no elements.</returns>
/// <exception cref="ArgumentNullException"><paramref name="source" /> is <see langword="null" />.</exception>
/// <exception cref="InvalidOperationException">The input sequence contains more than one element.</exception>
public static TSource SingleOrDefault<TSource>(this IEnumerable<TSource> source, TSource defaultValue)
{
var single = source.TryGetSingle(out bool found);
return found ? single! : defaultValue;
}
if I don't convert to the list it. then the system will be using this function
[DynamicDependency("SingleOrDefault`1", typeof(Enumerable))]
public static TSource? SingleOrDefault<TSource>(this IQueryable<TSource> source)
{
if (source == null)
throw Error.ArgumentNull(nameof(source));
return source.Provider.Execute<TSource>(
Expression.Call(
null,
CachedReflectionInfo.SingleOrDefault_TSource_1(typeof(TSource)), source.Expression));
}
and when run it result query error
System.InvalidOperationException: The LINQ expression 'DbSet<TUser>()
.Where(o => o.UserId == __userId_0)
.Select(s => s.IsBlock)
.FirstOrDefault(__p_1)' could not be translated. Either rewrite the query in a form that can be translated, or switch to client evaluation explicitly by inserting a call to 'AsEnumerable', 'AsAsyncEnumerable', 'ToList', or 'ToListAsync'. See https://go.microsoft.com/fwlink/?linkid=2101038 for more information. at Microsoft.EntityFrameworkCore.Query.Internal.NavigationExpandingExpressionVisitor.VisitMethodCall(MethodCallExpression methodCallExpression)
at System.Linq.Expressions.ExpressionVisitor.Visit(Expression node)
at Microsoft.EntityFrameworkCore.Query.Internal.NavigationExpandingExpressionVisitor.Expand(Expression query)
at Microsoft.EntityFrameworkCore.Query.QueryTranslationPreprocessor.Process(Expression query)
at Microsoft.EntityFrameworkCore.Query.QueryCompilationContext.CreateQueryExecutor[TResult](Expression query)
at Microsoft.EntityFrameworkCore.Storage.Database.CompileQuery[TResult](Expression query, Boolean async)
at Microsoft.EntityFrameworkCore.Query.Internal.QueryCompiler.CompileQueryCore[TResult](IDatabase database, Expression query, IModel model, Boolean async)
at Microsoft.EntityFrameworkCore.Query.Internal.QueryCompiler.<>c__DisplayClass9_0`1.<Execute>b__0()
at Microsoft.EntityFrameworkCore.Query.Internal.CompiledQueryCache.GetOrAddQuery[TResult](Object cacheKey, Func`1 compiler)
at Microsoft.EntityFrameworkCore.Query.Internal.QueryCompiler.Execute[TResult](Expression query)
at Microsoft.EntityFrameworkCore.Query.Internal.EntityQueryProvider.Execute[TResult](Expression expression)
at System.Linq.Queryable.FirstOrDefault[TSource](IQueryable`1 source, TSource defaultValue)
at Infrastructure.User.Customer.Repositories.UserRepository.IsBlockedCustomer(Guid userId)
at Core.User.Customer.UseCases.Requests.BlockedCustomerRequestUseCase.Handle(BlockedCustomerRequestDtoUseCase request, IResponseUseCase`1 response) in E:\Projects\Packages\Package-User\Core.User.Customer\UseCases\Requests\BlockedCustomerRequestUseCase.cs:line 40 at Core.User.Customer.Methods.UserMethods.IsBlockedCustomerAsync(Guid userId) in E:\Projects\Packages\Package-User\Core.User.Customer\Methods\UserMethods.cs:line 35 at API.Controllers.WeatherForecastController.IsBlockedCustomer() in E:\Projects\Packages\Package-User\API\Controllers\WeatherForecastController.cs:line 29 at lambda_method546(Closure , Object )
at Microsoft.AspNetCore.Mvc.Infrastructure.ActionMethodExecutor.TaskOfActionResultExecutor.Execute(IActionResultTypeMapper mapper, ObjectMethodExecutor executor, Object controller, Object[] arguments)
at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.<InvokeActionMethodAsync>g__Awaited|12_0(ControllerActionInvoker invoker, ValueTask`1 actionResultValueTask)
at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.<InvokeNextActionFilterAsync>g__Awaited|10_0(ControllerActionInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)
at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Rethrow(ActionExecutedContextSealed context)
at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)
at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.InvokeInnerFilterAsync()
--- End of stack trace from previous location ---
at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeFilterPipelineAsync>g__Awaited|20_0(ResourceInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)
at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeAsync>g__Awaited|17_0(ResourceInvoker invoker, Task task, IDisposable scope)
at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeAsync>g__Awaited|17_0(ResourceInvoker invoker, Task task, IDisposable scope)
at Microsoft.AspNetCore.Routing.EndpointMiddleware.<Invoke>g__AwaitRequestTask|6_0(Endpoint endpoint, Task requestTask, ILogger logger)
at Microsoft.AspNetCore.Authorization.AuthorizationMiddleware.Invoke(HttpContext context)
at Swashbuckle.AspNetCore.SwaggerUI.SwaggerUIMiddleware.Invoke(HttpContext httpContext)
at Swashbuckle.AspNetCore.Swagger.SwaggerMiddleware.Invoke(HttpContext httpContext, ISwaggerProvider swaggerProvider)
at Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware.Invoke(HttpContext context)
