C# c linq从linq返回多维数组

我想返回要在会话中保留的多维数组，但不确定如何从linq返回它：

public string[] GetCountryAndManufacturerForUser(int userId)
{

        var array = (from xx in _er.UserRoles
                     join xy in _er.Countries on xx.CountryId equals xy.Id
                     join xz in _er.Manufacturers on xx.ManufacturerId equals xz.Id
                     where xx.UserId == userId
                     select new { xy.Name, xz.Description }).ToArray();   

    return??
}

我知道我做错了什么，只是不知道是什么

编辑：

需要返回以下字段-xy.Name，xz.Description

比如：

编辑：

我已经尝试了下面的例子，但他们还没有完全达到我需要的程度-我认为下面的方法应该有效：

 /// <summary>
        /// 
        /// </summary>
        /// <param name="userId"></param>
        /// <returns></returns>
        public string[,] GetCountryAndManufacturerForUser(int userId)
    {

        var array = (from xx in _er.UserRoles
                     join xy in _er.Countries on xx.CountryId equals xy.Id
                     join xz in _er.Manufacturers on xx.ManufacturerId equals xz.Id
                     where xx.UserId == userId
                     select new { xy.Name, xz.Description }).ToArray();



          return array;

    }

锯齿阵列

多维数组

---

上述方法摘自John skeet对该问题的一个答案

最佳实践是使用具有定义成员的列表

public class Results
{
    public string name {get; set;}
    public string description {get; set;}
}

---

个人喜好，但我想我会走这条路

    public class UserData
    {
        public string Name;
        public string Description;
    }

    public UserData[] GetCountryAndManufacturerForUser(int userId)
    {

        var array = (from xx in _er.UserRoles
                     join xy in _er.Countries on xx.CountryId equals xy.Id
                     join xz in _er.Manufacturers on xx.ManufacturerId equals xz.Id
                     where xx.UserId == userId
                     select new UserData() { xy.Name, xz.Description }).ToArray();

        return array;
    }

---

原因是，如果您添加第三个或更多字段，使用字符串[]的代码将中断。

string[]是一维数组。你的方法的返回类型是错误的吗？我必须说，我们应该只使用多维数组进行矩阵计算。否则，请改用嵌套列表。查询的可能重复项将返回具有两个属性的匿名对象，但方法应返回字符串数组。您需要将匿名对象转换为stringsSome挑剔：这不是一个多维数组，而是一个交错数组。使用上面的方法，我得到的数组类型“System.String[]”无法在查询结果中初始化。考虑使用Stry.Stopy.Eng.List.1（Strase.String）代替.@ DaMITE最后一件事是，重新排列后，数组有时会被混淆，而不是返回选择新的列表{xz。描述，XY，Name }，ToArray；它带回了描述名称描述，而不是描述名称描述名称等我不确定原因-如果我在sql中运行查询，我看到了我期望的描述-描述-名称与Damith示例它失败，说我需要使用列表用户2795707你能提供一个示例吗？例如+1给出一个解决方案，避免出现可避免的损坏，如字符串[][]一个。请原谅语法错误。即使有详细的注释，过滤器也不允许将+1作为第一个词，但不要将+1放在第一个词之后。为什么不加一表示给出…：-

    public class UserData
    {
        public string Name;
        public string Description;
    }

    public List<UserData> GetCountryAndManufacturerForUser(int userId) {
        List<UserData> userdatas = new List<UserData>;
        userdatas = (from xx in _er.UserRoles
                join xy in _er.Countries on xx.CountryId equals xy.Id
                join xz in _er.Manufacturers on xx.ManufacturerId equals xz.Id
                where xx.UserId == userId
                select new { 
                Name = xy.Name, 
                Description = xz.Description 
                }).ToList();   
        return userdatas ;
    }

public string[][] GetCountryAndManufacturerForUser(int userId)
{

        return (from xx in _er.UserRoles
                     join xy in _er.Countries on xx.CountryId equals xy.Id
                     join xz in _er.Manufacturers on xx.ManufacturerId equals xz.Id
                     where xx.UserId == userId
                     select new string[]{ xy.Name, xz.Description }).ToArray();  
}

public string[,] GetCountryAndManufacturerForUser(int userId)
{

    var array  =(from xx in _er.UserRoles
                     join xy in _er.Countries on xx.CountryId equals xy.Id
                     join xz in _er.Manufacturers on xx.ManufacturerId equals xz.Id
                     where xx.UserId == userId
                     select new List<string>{ xy.Name, xz.Description }).ToArray(); 
    return CreateRectangularArray(array);  

}


static T[,] CreateRectangularArray<T>(IList<T>[] arrays)
{
    // TODO: Validation and special-casing for arrays.Count == 0
    int minorLength = arrays[0].Count();
    T[,] ret = new T[arrays.Length, minorLength];
    for (int i = 0; i < arrays.Length; i++)
    {
        var array = arrays[i];
        if (array.Count != minorLength)
        {
            throw new ArgumentException
                ("All arrays must be the same length");
        }
        for (int j = 0; j < minorLength; j++)
        {
            ret[i, j] = array[j];
        }
    }
    return ret;
}

public class Results
{
    public string name {get; set;}
    public string description {get; set;}
}

    public class UserData
    {
        public string Name;
        public string Description;
    }

    public UserData[] GetCountryAndManufacturerForUser(int userId)
    {

        var array = (from xx in _er.UserRoles
                     join xy in _er.Countries on xx.CountryId equals xy.Id
                     join xz in _er.Manufacturers on xx.ManufacturerId equals xz.Id
                     where xx.UserId == userId
                     select new UserData() { xy.Name, xz.Description }).ToArray();

        return array;
    }

    public class UserData
    {
        public string Name;
        public string Description;
    }

    public List<UserData> GetCountryAndManufacturerForUser(int userId) {
        List<UserData> userdatas = new List<UserData>;
        userdatas = (from xx in _er.UserRoles
                join xy in _er.Countries on xx.CountryId equals xy.Id
                join xz in _er.Manufacturers on xx.ManufacturerId equals xz.Id
                where xx.UserId == userId
                select new { 
                Name = xy.Name, 
                Description = xz.Description 
                }).ToList();   
        return userdatas ;
    }