小编Mus*_*afa的帖子

我有一段代码抛出异常，但我不太明白为什么。

 public  async Task<List<CategoryVm>> Handle(GetCategoriesListQuery request, CancellationToken cancellationToken)
    {
        var categories = (await _categoryRepository.ListAllAsync()).OrderBy(x => x.Name);
      //  var list = categories.ToList();
        return _mapper.Map<List<CategoryVm>>(categories);
    }

我设法解决了以下问题。知道为什么这有效就好了。

  public  async Task<List<CategoryVm>> Handle(GetCategoriesListQuery request, CancellationToken cancellationToken)
    {
        var categories = (await _categoryRepository.ListAllAsync()).OrderBy(x => x.Name);
        var list = categories.ToList();
        return _mapper.Map<List<CategoryVm>>(list);
    }

类别和类别Vm

public class CategoryVm
{
    public Guid CategoryId { get; set; }
    public string Name { get; set; } 
}
public class Category: AuditableEntity
{
    public Guid CategoryId { get; set; }
    public …