Question

我一直坚持这个：

using System;
using System.Data;
using System.Windows.Forms;
using System.Data.SqlClient;

namespace Supplier;
{
    public partial class Supplier : Form
    {
        public Supplier()
        {
            InitializeComponent();
        }

        public object ConfigurationManager { get; private set; }

        private void button3_Click(object sender, EventArgs e)
        {
             SqlConnection con = new SqlConnection();
             con.ConnectionString = ConfigurationManager.ConnectionStrings["constring"].ConnectionString;

             string command = "insert into Supplier (SupplierID, SupplierName, Address, City, Country, ContactName, Position, Product) values (@SupplierID, @SupplierName, @Address, @City, @Country, @ContactName, @Position, @Product)";

             SqlCommand com = new SqlCommand(command, con);
             com.CommandType = CommandType.Text;

我收到错误：

'object'不包含'ConnectionStrings'的定义，并且没有扩展方法'ConnectionStrings'接受类型'object'的第一个参数可以找到......

就行了

ConfigurationManager.ConnectionStrings["constring"].ConnectionString;

Answer 1

您需要添加对public override bool FinishedLaunching(UIApplication application, NSDictionary launchOptions) { // Override point for customization after application launch. // If not required for your application you can safely delete this method UIViewController yourViewController = UIStoryboard.FromName("yourStoryboard",NSBundle.MainBundle).InstantiateViewController("yourViewController_StoryboardID"); this.Window = new UIWindow(UIScreen.MainScreen.Bounds); UINavigationController navigationController = new UINavigationController(yourViewController); this.Window.RootViewController = navigationController; this.Window.MakeKeyAndVisible(); return true; }的引用，并在“使用”部分中添加System.Configuration.dll

Answer 2

谢谢大家！我删除了该对象，添加了使用System.Configuration，并在References选项卡中添加了对System.Configuration的引用。它奏效了！

错误CS1061'object'不包含'ConnectionStrings'的定义，也没有扩展方法'ConnectionStrings'接受

2 个答案: