C# Linq错误'DbSet() .GroupJoin(内部: DbSet()，outerKeySelector：‘无法转换

using System;
using System.Linq;

public class Program
{
    public static void Main()
    {
        // 创建外部集合
        var outerCollection = new[]
        {
            new { Id = 1, Name = "A" },
            new { Id = 2, Name = "B" },
            new { Id = 3, Name = "C" }
        };

        // 创建内部集合
        var innerCollection = new[]
        {
            new { Id = 1, Value = "X" },
            new { Id = 2, Value = "Y" },
            new { Id = 3, Value = "Z" }
        };

        // 使用GroupJoin方法进行连接
        var result = outerCollection.GroupJoin(
            innerCollection,
            outer => outer.Id,
            inner => inner.Id,
            (outer, inner) => new { Outer = outer, Inner = inner });

        // 输出结果
        foreach (var item in result)
        {
            Console.WriteLine($"Outer: {item.Outer.Name}, Inner: {string.Join(", ", item.Inner.Select(i => i.Value))}");
        }
    }
}