c# - 当前上下文中不存在名称 'ConfigurationManager'

Question

大家好，我收到以下错误:“名称‘ConfigurationManager’在当前上下文中不存在”

// namespaces
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Data.SqlClient;
using System.Configuration;
using System.IO;

namespace Database1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        public static string GetConnectionString(string strConnection)
        {
            //variable to hold our connection string for returning it

            string strReturn = "";
            //check to see if the user provided a connection string name
            //this is for if your application has more than one connection string

            if (!string.IsNullOrEmpty(strConnection)) //a connection string name was        
            {
                //get the connection string by the name provided
                strReturn = ConfigurationManager.ConnectionStrings[strConnection].ConnectionString;

            }
            else //no connection string name was provided
            {
                //get the default connection string
                strReturn = ConfigurationManager.ConnectionStrings["YourConnectionName"].ConnectionString;
            }
            //return the connection string to the calling method
            return strReturn;
        }

    }
}

Answer 1

您是否添加了对 System.Configuration.dll 的引用？