ASP.NET Core Razor Pages仓储异步Get方法ArgumentException异常求助

实体创建成功保存到数据库后，跳转到详情页时抛出ArgumentException异常，多次参照教程重写代码、更换仓储模式实现、修改实体ID类型（从Guid改为int）均无改善。

相关代码 #

ReadRepository.cs 查询方法 #

public async Task<T> GetByIdAsync(string id) => await Table.FindAsync(Guid.Parse(id));

ShowDraw.cshtml.cs #

private readonly IDrawReadRepository _drawReadRepository;

public ShowDrawModel(IDrawReadRepository drawReadRepository)
{
    _drawReadRepository = drawReadRepository;            
}

public Draw Draw { get; set; }

public async Task OnGet(string id)
{
    Draw = await _drawReadRepository.GetByIdAsync(id);

    if (Draw == null)
    {
        RedirectToPage("../Content/Error/UserNotFound");
    }            
}

CreateDraw.cshtml.cs（创建实体后跳转逻辑） #

public async Task<IActionResult> OnPostAsync()
{
    Draw draw;

    if (_signInManager.IsSignedIn(User))
    {
        var user = _userManager.GetUserAsync(User).Result;

        if (user != null)
        {
            draw = CreateDraw(user);
        }
        else
        {
            return RedirectToPage("/Error/UserNotFound");
        }
    }
    else
    {
        draw = CreateDraw(null);
    }

    await _drawWriteRepository.AddAsync(draw);
    await _drawWriteRepository.SaveAsync();

    return RedirectToPage("../User/ShowDraw", new { id = draw.Id.ToString() });
}

抛出的异常信息 #

An unhandled exception occurred while processing the request.
ArgumentException: Expression of type 'System.Collections.Generic.ICollection1[System.String]' cannot be used for parameter of type 'System.Collections.Generic.IList1[System.String]' of method 'System.Collections.Generic.IList1[System.String] PopulateList[String](System.Collections.Generic.IList1[System.String], System.Collections.Generic.IList`1[System.String])' (Parameter 'arg0')
System.Dynamic.Utils.ExpressionUtils.ValidateOneArgument(MethodBase method, ExpressionType nodeKind, Expression arguments, ParameterInfo pi, string methodParamName, string argumentParamName, int index)

ArgumentException: Expression of type 'System.Collections.Generic.ICollection1[System.String]' cannot be used for parameter of type 'System.Collections.Generic.IList1[System.String]' of method 'System.Collections.Generic.IList1[System.String] PopulateList[String](System.Collections.Generic.IList1[System.String], System.Collections.Generic.IList`1[System.String])' (Parameter 'arg0')
System.Dynamic.Utils.ExpressionUtils.ValidateOneArgument(MethodBase method, ExpressionType nodeKind, Expression arguments, ParameterInfo pi, string methodParamName, string argumentParamName, int index)
System.Linq.Expressions.Expression.Call(MethodInfo method, Expression arg0, Expression arg1)
Microsoft.EntityFrameworkCore.Query.Internal.EntityMaterializerSource.g__CreateMemberAssignment|14_0(Expression parameter, MemberInfo memberInfo, IPropertyBase property, Expression value)
Microsoft.EntityFrameworkCore.Query.Internal.EntityMaterializerSource.AddInitializeExpressions(HashSet properties, ParameterBindingInfo bindingInfo, Expression instanceVariable, List blockExpressions)
Microsoft.EntityFrameworkCore.Query.Internal.EntityMaterializerSource.CreateMaterializeExpression(List blockExpressions, ParameterExpression instanceVariable, Expression constructorExpression, HashSet properties, ParameterBindingInfo bindingInfo)
Microsoft.EntityFrameworkCore.Query.Internal.EntityMaterializerSource.CreateMaterializeExpression(EntityMaterializerSourceParameters parameters, Expression materializationContextExpression)
Microsoft.EntityFrameworkCore.Query.ShapedQueryCompilingExpressionVisitor+EntityMaterializerInjectingExpressionVisitor.CreateFullMaterializeExpression(ITypeBase concreteTypeBase, ValueTuple<Type, ParameterExpression, ParameterExpression, ParameterExpression> materializeExpressionContext)
Microsoft.EntityFrameworkCore.Query.ShapedQueryCompilingExpressionVisitor+EntityMaterializerInjectingExpressionVisitor.MaterializeEntity(StructuralTypeShaperExpression shaper, ParameterExpression materializationContextVariable, ParameterExpression concreteEntityTypeVariable, ParameterExpression instanceVariable, ParameterExpression entryVariable)
Microsoft.EntityFrameworkCore.Query.ShapedQueryCompilingExpressionVisitor+EntityMaterializerInjectingExpressionVisitor.ProcessEntityShaper(StructuralTypeShaperExpression shaper)
Microsoft.EntityFrameworkCore.Query.ShapedQueryCompilingExpressionVisitor+EntityMaterializerInjectingExpressionVisitor.VisitExtension(Expression extensionExpression)
Microsoft.EntityFrameworkCore.Query.ShapedQueryCompilingExpressionVisitor+EntityMaterializerInjectingExpressionVisitor.Inject(Expression expression)
Microsoft.EntityFrameworkCore.Query.ShapedQueryCompilingExpressionVisitor.InjectEntityMaterializers(Expression expression)
Microsoft.EntityFrameworkCore.Query.RelationalShapedQueryCompilingExpressionVisitor+ShaperProcessingExpressionVisitor.VisitExtension(Expression extensionExpression)
Microsoft.EntityFrameworkCore.Query.RelationalShapedQueryCompilingExpressionVisitor+ShaperProcessingExpressionVisitor.ProcessShaper(Expression shaperExpression, out RelationalCommandCache relationalCommandCache, out IReadOnlyList readerColumns, out LambdaExpression relatedDataLoaders, ref int collectionId)
Microsoft.EntityFrameworkCore.Query.RelationalShapedQueryCompilingExpressionVisitor.VisitShapedQuery(ShapedQueryExpression shapedQueryExpression)
Microsoft.EntityFrameworkCore.Query.ShapedQueryCompilingExpressionVisitor.VisitExtension(Expression extensionExpression)
Microsoft.EntityFrameworkCore.Query.RelationalShapedQueryCompilingExpressionVisitor.VisitExtension(Expression extensionExpression)
Microsoft.EntityFrameworkCore.Query.QueryCompilationContext.CreateQueryExecutor(Expression query)
Microsoft.EntityFrameworkCore.Storage.Database.CompileQuery(Expression query, bool async)
Microsoft.EntityFrameworkCore.Query.Internal.QueryCompiler.CompileQueryCore(IDatabase database, Expression query, IModel model, bool async)
Microsoft.EntityFrameworkCore.Query.Internal.QueryCompiler+<>c__DisplayClass12_0.b__0()
Microsoft.EntityFrameworkCore.Query.Internal.CompiledQueryCache.GetOrAddQuery(object cacheKey, Func<Func<QueryContext, TResult>> compiler)
Microsoft.EntityFrameworkCore.Query.Internal.QueryCompiler.ExecuteAsync(Expression query, CancellationToken cancellationToken)
Microsoft.EntityFrameworkCore.Query.Internal.EntityQueryProvider.ExecuteAsync(Expression expression, CancellationToken cancellationToken)
Microsoft.EntityFrameworkCore.EntityFrameworkQueryableExtensions.ExecuteAsync<TSource, TResult>(MethodInfo operatorMethodInfo, IQueryable source, Expression expression, CancellationToken cancellationToken)
Microsoft.EntityFrameworkCore.EntityFrameworkQueryableExtensions.ExecuteAsync<TSource, TResult>(MethodInfo operatorMethodInfo, IQueryable source, LambdaExpression expression, CancellationToken cancellationToken)
Microsoft.EntityFrameworkCore.EntityFrameworkQueryableExtensions.FirstOrDefaultAsync(IQueryable source, Expression<Func<TSource, bool>> predicate, CancellationToken cancellationToken)
Microsoft.EntityFrameworkCore.Internal.EntityFinder.FindAsync(object[] keyValues, CancellationToken cancellationToken)
Microsoft.EntityFrameworkCore.Internal.InternalDbSet.FindAsync(object[] keyValues)
xxx.Persistence.Repositories.ReadRepository.GetByIdAsync(string id) in ReadRepository.cs
public async Task GetByIdAsync(string id) => await Table.FindAsync(Guid.Parse(id));
xxx.Pages.User.ShowDrawModel.OnGet(string id)
Microsoft.AspNetCore.Mvc.RazorPages.Infrastructure.ExecutorFactory+NonGenericTaskHandlerMethod.Execute(object receiver, object[] arguments)
Microsoft.AspNetCore.Mvc.RazorPages.Infrastructure.PageActionInvoker.InvokeHandlerMethodAsync()
Microsoft.AspNetCore.Mvc.RazorPages.Infrastructure.PageActionInvoker.InvokeNextPageFilterAsync()
Microsoft.AspNetCore.Mvc.RazorPages.Infrastructure.PageActionInvoker.Rethrow(PageHandlerExecutedContext context)
Microsoft.AspNetCore.Mvc.RazorPages.Infrastructure.PageActionInvoker.Next(ref State next, ref Scope scope, ref object state, ref bool isCompleted)
Microsoft.AspNetCore.Mvc.RazorPages.Infrastructure.PageActionInvoker.InvokeInnerFilterAsync()
Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.g__Awaited|25_0(ResourceInvoker invoker, Task lastTask, State next, Scope scope, object state, bool isCompleted)
Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.Rethrow(ResourceExecutedContextSealed context)
Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.Next(ref State next, ref Scope scope, ref object state, ref bool isCompleted)
Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.InvokeFilterPipelineAsync()
Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.g__Awaited|17_0(ResourceInvoker invoker, Task task, IDisposable scope)
Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.g__Awaited|17_0(ResourceInvoker invoker, Task task, IDisposable scope)
Microsoft.AspNetCore.Authorization.AuthorizationMiddleware.Invoke(HttpContext context)
Microsoft.AspNetCore.Authentication.AuthenticationMiddleware.Invoke(HttpContext context)
Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddlewareImpl.Invoke(HttpContext context)

已尝试方案 #

• 将实体ID类型从Guid改为int，异常仍出现
• 参照教程使用3种不同仓储模式实现，问题未解决

原因分析与解决方案 #

原因 #

异常核心提示ICollection<string>无法转换为IList<string>，这是EF Core在实体化Draw对象时，尝试调用内部PopulateList方法填充集合属性，但该方法要求参数为IList<T>类型，而你的Draw实体中存在类型为ICollection<string>的集合属性，导致类型不匹配。

解决方案 #

1. 修改实体集合属性类型
   检查Draw实体类，将所有ICollection<string>类型的属性改为IList<string>。例如：

// 原代码
public ICollection<string> Tags { get; set; }

// 修改后
public IList<string> Tags { get; set; } = new List<string>();

2. 配置EF Core集合转换（可选，不修改实体类型时使用）
   如果不想修改实体属性类型，可以在DbContext的OnModelCreating方法中，为该集合属性配置转换逻辑，确保EF Core使用List<string>实例填充：

protected override void OnModelCreating(ModelBuilder modelBuilder)
{
    modelBuilder.Entity<Draw>()
        .Property(d => d.Tags)
        .HasConversion(
            v => string.Join(',', v),
            v => v.Split(',', StringSplitOptions.RemoveEmptyEntries).ToList()
        );
}

注：此方式适用于存储字符串分割的集合，根据你的实际存储方式调整转换逻辑。

3. 修复ShowDraw页跳转逻辑（次要问题）
   当前ShowDraw.cshtml.cs的OnGet方法中，RedirectToPage没有返回值，导致即使Draw为null也不会执行跳转，需修改为：

public async Task<IActionResult> OnGet(string id)
{
    Draw = await _drawReadRepository.GetByIdAsync(id);

    if (Draw == null)
    {
        return RedirectToPage("../Content/Error/UserNotFound");
    }
    return Page();
}

内容的提问来源于stack exchange，提问作者dorvazgon