c# - 无法隐式转换类型 'System.Collections.Generic.List

Question

我有这个应用程序，我试图将列表传递给另一个类。我不断收到错误

Cannot implicitly convert type 'System.Collections.Generic.List<eko_app.LoginForm.Business>' to 'System.Collections.Generic.List<eko_app.GlobalClass.Business>'

列表由 Json 生成。

登录类

   private void Connect()
        {
            try
            {
                serverUrl = "https://eko-app.com/Users/login/username:" + usernameEntered + "/password:" + passwordEntered + ".json";

                var w = new WebClient();
                var jsonData = string.Empty;

                // make the login api call
                jsonData = w.DownloadString(serverUrl);

                if (!string.IsNullOrEmpty(jsonData))
                {
                    // deserialize the json to c# .net
                    var response = Newtonsoft.Json.JsonConvert.DeserializeObject<RootObject>(jsonData);

                    // Get the sessionId
                    GlobalClass.SessionId = string.Empty;
                    GlobalClass.SessionId = response.response.SessionId;

                    if (GlobalClass.SessionId != null)
                    {                      
                        var businesses = response.response.Businesses;

                        GlobalClass.Username = "";
                        GlobalClass.Username = usernameEntered;                        

                        GlobalClass.Businesses = null;
                        GlobalClass.Businesses = businesses; **<-----error thrown here**

                        HomeForm homeForm = new HomeForm();
                        this.Hide();
                        homeForm.Show();
                    }
                    else
                    {
                        Console.WriteLine("Login failed");
                    }
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }

        private class Business
        {
            public string businessID { get; set; }
            public string businessName { get; set; }
        }

        private class Response
        {
            [JsonProperty("sessionId")]
            public string SessionId { get; set; }

            [JsonProperty("businesses")]    
            public List<Business> Businesses { get; set; }
        }

        private class Messages
        {
            public string sessionId { get; set; }
            public List<Business> businesses { get; set; }
        }

        private class RootObject
        {
            public Response response { get; set; }
            public Messages messages { get; set; }
        }

我还有一个类:全局类

namespace eko_app
{
    static class GlobalClass
    {
       ...some code     

        public class Business
        {
            private string businessID { get; set; }
            private string businessName { get; set; }
        }

        private static List<Business> businesses = null;

        public static List<Business> Businesses
        {
            get { return businesses; }
            set { businesses = value; }
        }
    }
}

我做错了什么？错误在 GlobalClass.Businesses = businesses;

的第一个类中抛出

Answer 1

您似乎有两个相同的类 Business - 一个嵌套在您的 GlobalClass 中，另一个嵌套在您的 LoginForm 中。

虽然这两个类看起来一样，但它们不能相互分配。此外，基于这些类的集合也不能相互分配。

考虑删除其中一个类(例如 LoginForm 中的私有(private)类)并将其所有用途替换为公共(public)的 GlobalClass.Business。