写一个CSV文件

Question

我有，我已经用C＃编写，并饰以FileHelpers类属性

[DelimitedRecord(","), IgnoreFirst(1)] 
class UserAndValues 
{ 
    public int UserID { get; set; } 
    public string FirstName { get; set; } 
    public string LastName { get; set; } 
    public ICollection<UserFavourites> Favourites {get;set;} 

    public UserAndValues() 
    { } 
} 

class UserFavourites 
{ 
    public int Id {get;set;} 
    public string Title {get;set;} 
} 

我随后致电CSV作家

var engine = new FileHelperEngine<UserAndValues>(); 
engine.WriteFile(myPath, myListOfUsers); 

我收到以下错误：

The field: 'k__BackingField' has the type: ICollection`1 that is not a system type, so this field need a CustomConverter ( Please Check the docs for more Info).

我想写出一个文件，基本上看起来像

UserId, FirstName, LastName, Favourite1Id, Favourite1Title, Favourite2Id, Favourite2Title... 
1, Joe, Smith, 1, Random Title, 2, More Title, ... 

收藏集合可以是10-50记录深度，并根据文件进行更改。

我不需要阅读这个文件，只需要编写它。

如何使用上述类生成CSV？ （我可以修改类结构）

Answer 1

很好，很未经测试：

class UserAndValues 
{ 
    public int UserID { get; set; } 
    public string FirstName { get; set; } 
    public string LastName { get; set; } 
    [FieldConverter(typeof(MyListConverter))] 
    public ICollection<UserFavourites> Favourites {get;set;} 
} 

public class MyListConverter: ConverterBase 
{ 

    public override object StringToField(string from) 
    { 
     throw new NotImplemented("bad luck"); 
    } 

    public override string FieldToString(object fieldValue) 
    { 
     var list = fieldValue as ICollection<UserFavourites>; 

     return string.Join(",", 
      list.Select(f => f.ToString())); // customize 
    } 

}