从控制器调用列表类

Question

如何从控制器调用我的班级列表？

这是我的模型：

public class AuthJsonResponses

{

    public int Code { get; set; }

    public string Jwt { get; set; }

    //public string[] Message { get; set; }

    public List<RootObject> Message { get; set; }

}

public class RootObject

{

    public string msg { get; set; }

    public string code { get; set; }

}

这就是我在控制器中调用的：

List<RootObject> rootObj = new List<RootObject>();

rootObj[0].code = "success_04";

rootObj[0].msg = "Access granted";

JsonRes.Message = rootObj;

但是，我不知道的范围似乎存在问题。我的代码有什么问题？

Answer 1

您可以执行以下操作之一：&nbsp;List<RootObject> rootObj = new List<RootObject>();&nbsp; &nbsp; &nbsp; &nbsp; var newObj=new RootObject()&nbsp; &nbsp; &nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; code = "success_04",&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; msg = "Access granted"&nbsp; &nbsp; &nbsp; &nbsp; };&nbsp; &nbsp; &nbsp; &nbsp; rootObj.Add(newObj);&nbsp; &nbsp; &nbsp; &nbsp; List<RootObject> rootObj1 = new List<RootObject>()&nbsp; &nbsp; &nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; new RootObject()&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; code = "success_04",&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; msg = "Access granted"&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; &nbsp; &nbsp; };接着JsonRes.Message = rootObj;

Answer 2

您正在像处理数组一样处理列表，这是行不通的，您需要使用该Add方法，例如rootObj.Add(new RootObj{&nbsp; &nbsp; code = "success_04",&nbsp; &nbsp; msg = "Access granted"});您还可以使用该AddRange方法添加多个对象，例如rootObj.AddRange(new List<RootObj>{new RootObj{&nbsp; &nbsp; code = "success_04",&nbsp; &nbsp; msg = "Access granted"}, new RootObj{&nbsp; &nbsp; code = "success_05",&nbsp; &nbsp; msg = "Access denied"}});

Answer 3

直接访问您的AuthJsonResponses实例。首先，更新该类以使其Message具有私有设置器并将其实例化为List<RootObject>public class AuthJsonResponses{&nbsp; &nbsp; public int Code { get; set; }&nbsp; &nbsp; public string Jwt { get; set; }&nbsp; &nbsp; public List<RootObject> Messages { get; private set; } = new List<RootObject>();}public class RootObject{&nbsp; &nbsp; public string msg { get; set; }&nbsp; &nbsp; public string code { get; set; }}在您的代码中，直接将对象添加到Message属性中。我建议将其重命名为Messages以表明它是一个集合jsonRes.Messages.Add(new RootObject{msg ="Access granted", code="success_04"});

Answer 4

您面临的问题是您在初始化列表之后引用列表的第一个元素！初始化本身只是创建List类的对象，它不创建任何元素！因此，您必须自己创建RootObject类的对象，然后将其添加到列表中：// create objectvar r = new RootObject();r.code = "success_04";r.msg = "Access granted";// add it to listrootObj.Add(r);

Answer 5

当您List实际使用时，您可以使用从类继承的方法IEnumerable，因为 List 是 IEnumerable 的实现。你可以这样做：List<RootObject> rootObj = new List<RootObject>();//delete this---- rootObj[0].code = "success_04";//delete this---- rootObj[0].msg = "Access granted";//use thisrootObj.Add(new RootObject{code = "success_04",msg = "Access Granted"})JsonRes.Message = rootObj;