C# 中winform使用ConfigurationManager出错

来源：百度知道 编辑：UC知道 时间：2024/06/24 07:16:13
using System;
using System.Collections.Generic;
using System.Text;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;

namespace CK.my
{
public class connDB
{
private readonly string RETURNVALUE = "RETURNVALUE";
protected SqlConnection cn;
protected String ConnectionString;
public connDB()
{
ConnectionString = ConfigurationManager.ConnectionStrings["CK.Properties.Settings.xintang_DataConnectionString"].ConnectionString;
}

提示：当前上下文中不存在ConfigurationManager，这是怎么回事啊
用的是vs2005

ConfigurationManager 类

提供对客户端应用程序配置文件的访问。无法继承此类。

命名空间： System.Configuration
程序集： System.Configuration（在 System.Configuration.dll 中）

你添加有System.Configuration.dll没有？添加了就会有那个了ConfigurationManager

// Show how to use AppSettings.
static void DisplayAppSettings()
{

// Get the AppSettings collection.
NameValueCollection appSettings =
ConfigurationManager.AppSettings;

string[] keys = appSettings.AllKeys;

Console.WriteLine();
Console.WriteLine("Application appSettings:");

// Loop to get key/value pairs.
for (int i = 0; i < appSettings.Count; i++)

Console.WriteLine("#{0} Name: {1} Value: {2}",
i, keys[i], appSettings[i]);

}

// Show how to use Connecti