从配置文件实现WCF的调用

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Data;
using System.ServiceModel;
namespace wcfService
{
    [ServiceContract]
public     interface IHelloService
    {
        [OperationContract]
        DateTime GetDataTime();
          [OperationContract]
        DataTable GetUserInfo();
    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Data;
using System.Data.SqlClient;
using wcfService;
namespace WinformHello
{
public    class HelloService:IHelloService
    {

        public DateTime GetDataTime()
        {
            return DateTime.Now;
        }

        public System.Data.DataTable GetUserInfo()
        {
            string sql = @"Data Source=.;Initial Catalog=Students;User ID=sa;Password=abcd1234!";
            SqlConnection conn = new SqlConnection();
            SqlDataAdapter sda = new SqlDataAdapter("select  * from student",conn);
            //DataSet ds = new DataSet();
            DataTable dt = new DataTable();
            sda.Fill(dt);
            return dt;
        }
    }
}

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
    <startup> 
        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5" />
    </startup>
  <system.serviceModel>
    <services>
      <service name="WinformHello.HelloService" behaviorConfiguration="TestBehavior">
        <host>
          <baseAddresses>
            <add baseAddress="http://localhost:8080/Hello"/>
          </baseAddresses>
        </host>
        <endpoint address="" binding="basicHttpBinding" contract="wcfService.IHelloService">
          
        </endpoint>
      </service>
    </services>

    <behaviors>
      <serviceBehaviors>
        <behavior name="TestBehavior">
          <serviceMetadata httpGetEnabled="true"/>
        </behavior>
      </serviceBehaviors>
    </behaviors>
    
  </system.serviceModel>
</configuration>

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.ServiceModel;

namespace WinformHello
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }


        ServiceHost host = null;

        private void button1_Click(object sender, EventArgs e)
        {
            host = new ServiceHost(typeof(WinformHello.HelloService));
            host.Open();
            label1.Text = "服务已启动……";
        }
    }
}