在ASP中从视图模型保存到模型.净MVC

我有两个模型，一个代码模型和一个标签模型，它们通过多对多关系链接在一起。我试图添加一个代码条目，其中包括使用视图模型的许多标签的可能选择(使用我的视图中的标签的复选框)。我得到错误:

传入字典的模型项的类型为'System.Collections.Generic.List'1[StoRed.Models. list]。，但是这个字典需要一个类型为'System.Collections.Generic.IEnumerable ' 1[StoRed.Models.CodeTagViewModel]'的模型项

感觉就像我需要以某种方式转换我的数据到可接受的格式之前，试图将其保存到表中，但我是新的MVC，我有麻烦找到任何有用的信息在互联网上关于我的具体问题。如有任何帮助，我将不胜感激。

代码模型

public class Code
{
    [Key]
    public int CodeID { get; set; }
    [Required]
    [StringLength(30)]
    public string Title { get; set; }
    [Required]
    [StringLength(150)]
    public string Description { get; set; }
    public DateTime DateAdded { get; set; }
    public DateTime LastUpdated { get; set; }
    [Required]
    [StringLength(30)]
    public string Project { get; set; }
    [Required]
    [StringLength(30)]
    public string CMS { get; set; }
    public int DotNetVersion { get; set; }
    [Required]
    [StringLength(150)]
    public string Dependencies { get; set; }
    [StringLength(30)]
    public string Author { get; set; }
    public string CodeFile { get; set; }
    [Required]
    [StringLength(100)]
    public string TFSLocation { get; set; }
    ////Creates a relationship in the DB with Tag
    //[ForeignKey("TagID")]
    public virtual ICollection<Tag> Tags { get; set; }
    ////Purely for API
    //[Required]
    public int TagID { get; set; }
}

标签模型

public class Tag
{
    [Key]
    public int TagID { get; set; }
    [Required]
    [StringLength(30)]
    public string TagName { get; set; }
    public virtual ICollection<Code> Code { get; set; }
}

中

public class Context : DbContext
{
    public DbSet<Code> Code { get; set; }
    public DbSet<Tag> Tags { get; set; }
}

视图模型

public class CodeTagViewModel
{
    public Tag Tag { get; set; }
    public Tag TagID { get; set; }
    public List<Tag> Tags { get; set; }

    public int CodeID { get; set; }
    public string Title { get; set; }
    public string Description { get; set; }
    public DateTime DateAdded { get; set; }
    public DateTime LastUpdated { get; set; }
    public string Project { get; set; }
    public string CMS { get; set; }
    public int DotNetVersion { get; set; }
    public string Dependencies { get; set; }
    public string Author { get; set; }
    public string CodeFile { get; set; }
    public string TFSLocation { get; set; }
}

代码控制器的相关部分

    [HttpPost]
    public ActionResult Create(CodeTagViewModel codeTagViewModel)
    {
        if (ModelState.IsValid)
        {
            Code code = new Code();
            Tag tag = new Tag();
            var codeTag = new CodeTagViewModel();
            code.Title = codeTagViewModel.Title;
            code.Description = codeTagViewModel.Description;
            code.DateAdded = codeTagViewModel.DateAdded;
            code.LastUpdated = codeTagViewModel.LastUpdated;
            code.Project = codeTagViewModel.Project;
            code.CMS = codeTagViewModel.CMS;
            code.DotNetVersion = codeTagViewModel.DotNetVersion;
            code.Dependencies = codeTagViewModel.Dependencies;
            code.Author = codeTagViewModel.Author;
            code.CodeFile = codeTagViewModel.CodeFile;
            code.TFSLocation = codeTagViewModel.TFSLocation;
            code.Tags = codeTagViewModel.Tags;
            db.Code.Add(code);
            db.SaveChanges();
            return RedirectToAction("Index");  
        }
        return View(codeTagViewModel);
    }

public interface ICodeCommandHandler
{
    int Save(CodeTagViewModel input);
}
public class CodeCommandHandler : ICodeCommandHandler
{
    private IRepository<Code> repository;
    public CodeCommandHandler(IRepository<Code> repository)
    {
        this.repository = repository;
    }
    public int Save(CodeTagViewModel input)
    {
        Code code = new Code();
        Tag tag = new Tag();
        code.Title = input.Title;
        code.Description = input.Description;
        code.DateAdded = input.DateAdded;
        code.LastUpdated = input.LastUpdated;
        code.Project = input.Project;
        code.CMS = input.CMS;
        code.DotNetVersion = input.DotNetVersion;
        code.Dependencies = input.Dependencies;
        code.Author = input.Author;
        code.CodeFile = input.CodeFile;
        code.TFSLocation = input.TFSLocation;
        code.Tags.Add(tag);
        return repository.Save(code);
    }
}

private readonly ICodeCommandHandler commandHandler;
public CodeController(ICodeCommandHandler commandHandler)
{
    this.commandHandler = commandHandler;
}
[HttpPost]
public ActionResult Create(CodeTagViewModel codeTagViewModel)
{
    if (!ModelState.IsValid)
    {
        return View(codeTagViewModel);
    }
    var id = codeCommandHandler.Save(codeTagViewModel);
    // maybe do something useful with the document id after save
    return RedirectToAction("Index");  
}

public interface IRepository<T>
{
    int Save(T entity);
}
public class CodeRepository : IRepository<Code>
{
    public int Save(Code entity)
    {
        using (var context = new Context())
        {
            context.Code.Add(entity);
            context.SaveChanges();
        }
    }
}