小编zhe*_*ang的帖子

我使用SQL Server CLR集成来创建一个ASSEMBLY.

加载命令: CREATE ASSEMBLY TcpClr FROM 'G:\TcpClrTest.dll' WITH PERMISSION_SET = UNSAFE

没有App.Config

DLL代码包含: string ip=ConfigurationManager.AppSettings["connection"].ToString();

App.config还包含:

<appSettings> <add key="connection" value="127.0.0.1"/> </appSettings>

但是当我执行PROCEDURE时,SQL Server显示错误 System.NullReferenceException

SQL Server CLR集成是否支持App.config文件？

我创建了一个这样的模型

import Foundation

class Play:ObservableObject{
    @Published var name:String="Tayle"
    @Published var age:Int=12
}

它将在两个视图中使用

例如：

struct Demo: View {
    //1
    @State private var play:Play = Play()
    //2
    //@StateObject private var play:Play = Play()
    var body: some View {
        NavigationView{
            NavigationLink(destination: PlayNameView(play: play)){
                Text("go to platnbame")
            }
        }
    }
}

struct PlayNameView:View{
    @ObservedObject var play:Play
    var body: some View{
        HStack{
            Text("Hello,\(play.name)")
            Button(action:{
                play.name="iop"
            }){
                Text("change the name to:iop")
            }
            
        }
    }
}

当我运行该项目时，他们有相同的行为。如果@StateObject可以做到，为什么还要选择@State