c# - asp mvc View 模型验证属性

Question

我将一个 ViewModel 用于两个操作:创建和更新。但是场

CommonFile

(具有必需属性)位于创建 View 中。因此 ModelState.IsValid 在更新操作中为 false。如何在这两个 View 中使用一个模型 View ？

public class UnitViewModel
{   
    public int Id { get; set; }

    [Required(ErrorMessage = "Required field")]
    [StringLength(256, ErrorMessage = "SomeMessage")]
    public string Title { get; set; }

    public string Code { get; set; }

    [Required(ErrorMessage = "Required field")]
    [DateAttribute(ErrorMessage = "Incorrect date format")]
    public string MapDeadline { get; set; }

    public int InAllCount { get; set; }

    public int LoadedCount { get; set; }

    [Required(ErrorMessage = "Required field")] 
    [FileAttribute(AllowedFileExtensions = new string [] { ".xls", ".xlsx" })]
    public HttpPostedFileBase CommonFile { get; set; }
}

Answer 1

有一个继承UnitViewModel的CreateViewModel

public class CreateViewModel : UnitViewModel 
{
    [Required(ErrorMessage = "Required field")] 
    [FileAttribute(AllowedFileExtensions = new string [] { ".xls", ".xlsx" })]
    public HttpPostedFileBase CommonFile { get; set; }
}