自定义值注入

发布于 2024-12-12 17:29:35 字数 615 浏览 2 评论 0原文

我对如何在未定义源属性的情况下注入值有疑问。所以我有2个类：

User.cs

public class User
{
    public int UserId { get; set; }
    public string UserName { get; set; }
}

和UserViewModel.cs

public class UserViewModel
{
    public int UserId { get; set; }
    public string UserName { get; set; }
    public string RoleName { get; set; }
}

如何注入RoleName？我需要调用我的服务来检查数据库用户的角色。我不想像这样在 get property 中调用服务：

public string RoleName
    {
        get { return Roles.GetRolesForUser(UserName).FirstOrDefault(); }
    }

我想使用值注入器来实现这一点。先感谢您

原文

I have question about how to inject value with no source property defined.
so I have 2 class :

User.cs

public class User
{
    public int UserId { get; set; }
    public string UserName { get; set; }
}

and UserViewModel.cs

public class UserViewModel
{
    public int UserId { get; set; }
    public string UserName { get; set; }
    public string RoleName { get; set; }
}

how to inject the RoleName? I need to call my service to check to database what user's role. and I dont wanna the service called in get property like this :

public string RoleName
    {
        get { return Roles.GetRolesForUser(UserName).FirstOrDefault(); }
    }

I want to achieve this using value injecter.
Thank you in advance

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递刀给你 2024-12-19 17:29:35

如果你真的想通过价值注入来做到这一点，你可以这样做：

public class SetRole : NoSourceValueInjection
     {
         protected override void Inject(object target)
         {
             dynamic t = target;
             t.RoleName = Roles.GetRolesForUser(t.UserName).FirstOrDefault();
         }
     }

uvm.InjectFrom(user)
   .InjectFrom<SetRole>();

if you really really want to do this with a valueinjection you could do like this:

public class SetRole : NoSourceValueInjection
     {
         protected override void Inject(object target)
         {
             dynamic t = target;
             t.RoleName = Roles.GetRolesForUser(t.UserName).FirstOrDefault();
         }
     }

uvm.InjectFrom(user)
   .InjectFrom<SetRole>();

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