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如何让Silverlight从MySQL获取数据

data-binding silverlight mysql .net c#

Isak Savo · 技术社区 · 16 年前

我在Silverlight中编写了一个小的hello world测试应用程序,我想在Linux/Apache2服务器上托管它。我希望数据来自MySQL(或其他与Linux兼容的数据库),这样我就可以将数据绑定到数据库中的内容。

MySqlConnection conn = new MySqlConnection("Server=the.server.com;Database=theDb;User=myUser;Password=myPassword;");
conn.Open();
MySqlCommand command = new MySqlCommand("SELECT * FROM test;", conn);
using (MySqlDataReader reader = command.ExecuteReader())
{
     StringBuilder sb = new StringBuilder();
     while (reader.Read())
     {
         sb.AppendLine(reader.GetString("myColumn"));
     }
     this.txtResults.Text = sb.ToString();
}

如果我给予发布的ClickOnce应用程序完全信任(或者至少是socketPermission),并且 本地运行 .

我想让它在服务器上运行,但无法使其正常工作,结果总是出现权限异常(不允许socketpermission)。

如果这有任何区别,则数据库托管在与Silverlight应用程序相同的服务器上。

编辑好吧,我现在明白了为什么在客户端应用程序中使用DB凭据是一个坏主意(显然)。那么人们是怎么做到的呢?如何保护代理Web服务,使其以安全的方式在客户机/db之间传递数据?网上有什么例子吗?

当然,我不是第一个想使用数据库为Silverlight应用程序供电的人吗?

6 回复 | 直到 16 年前

Rob 16 年前

MatthiasS 14 年前

PHP, MySQL and Silverlight: The Complete Tutorial

cruizer 16 年前

angularsen Bcelik 13 年前

MySQL Connector/Net

Step By Step Guide to WCF RIA enabled SL4 application with Entity Framework

<ListBox x:Name="TestList" Width="100" />

public partial class Home : Page
{
    public Home()
    {
        InitializeComponent();

        Loaded += Home_Loaded;
    }

    void Home_Loaded(object sender, RoutedEventArgs e)
    {
        var context = new FooDomainContext();
        var query = context.Load(context.GetPersonsQuery());
        TestList.ItemsSource = query.Entities;
        TestList.DisplayMemberPath = "name";
    }
}

Kristian J. 16 年前

mjb 11 年前

Add a new Silverlight project

Create a new Web Service

enter image description here

using System;
using System.Collections.Generic;
using System.Web;
using System.Web.Services;

namespace SilverlightApplication1.Web
{
    /// <summary>
    /// Summary description for WebService1
    /// </summary>
    [WebService(Namespace = "http://tempuri.org/")]
    [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
    [System.ComponentModel.ToolboxItem(false)]
    public class WebService1 : System.Web.Services.WebService
    {
        [WebMethod]
        public string HelloWorld()
        {
            return "Hello World";
        }
    }
}

using MySql.Data.MySqlClient;

public string ExecuteScalar(string sql)
{
    try
    {
        string result = "";
        using (MySqlConnection conn = new MySqlConnection(constr))
        {
            using (MySqlCommand cmd = new MySqlCommand())
            {
                conn.Open();
                cmd.Connection = conn;
                cmd.CommandText = sql;
                result = cmd.ExecuteScalar() + "";
                conn.Close();
            }
        }
        return result;
    }
    catch (Exception ex)
    {
        return ex.Message;
    }
}

public string ExecuteNonQuery(string sql)
{
    try
    {
        long i = 0;
        using (MySqlConnection conn = new MySqlConnection(constr))
        {
            using (MySqlCommand cmd = new MySqlCommand())
            {
                conn.Open();
                cmd.Connection = conn;
                cmd.CommandText = sql;
                i = cmd.ExecuteNonQuery();
                conn.Close();
            }
        }
        return i + " row(s) affected by the last command, no resultset returned.";
    }
    catch (Exception ex)
    {
        return ex.Message;
    }
}

using System;
using System.Collections.Generic;
using System.Web;
using System.Web.Services;
using MySql.Data.MySqlClient;

namespace SilverlightApplication1.Web
{
    [WebService(Namespace = "http://tempuri.org/")]
    [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
    [System.ComponentModel.ToolboxItem(false)]
    public class WebService1 : System.Web.Services.WebService
    {
        string constr = "server=localhost;user=root;pwd=1234;database=test;";

        [WebMethod]
        public string ExecuteScalar(string sql)
        {
            try
            {
                string result = "";
                using (MySqlConnection conn = new MySqlConnection(constr))
                {
                    using (MySqlCommand cmd = new MySqlCommand())
                    {
                        conn.Open();
                        cmd.Connection = conn;
                        cmd.CommandText = sql;
                        result = cmd.ExecuteScalar() + "";
                        conn.Close();
                    }
                }
                return result;
            }
            catch (Exception ex)
            {
                return ex.Message;
            }
        }

        [WebMethod]
        public string ExecuteNonQuery(string sql)
        {
            try
            {
                long i = 0;
                using (MySqlConnection conn = new MySqlConnection(constr))
                {
                    using (MySqlCommand cmd = new MySqlCommand())
                    {
                        conn.Open();
                        cmd.Connection = conn;
                        cmd.CommandText = sql;
                        i = cmd.ExecuteNonQuery();
                        conn.Close();
                    }
                }
                return i + " row(s) affected by the last command, no resultset returned.";
            }
            catch (Exception ex)
            {
                return ex.Message;
            }
        }  
    }
}

Rebuild the project

http://www.mywebsite.com/clientaccesspolicy.xml http://www.mywebsite.com/crossdomain.xml

<?xml version="1.0" encoding="utf-8"?>
<access-policy>
  <cross-domain-access>
    <policy>
      <allow-from http-request-headers="SOAPAction">
        <domain uri="*"/>
      </allow-from>
      <grant-to>
        <resource path="/" include-subpaths="true"/>
      </grant-to>
    </policy>
  </cross-domain-access>
</access-policy>

<?xml version="1.0" encoding="utf-8"?>
<access-policy>
  <cross-domain-access>
    <policy>
      <allow-from http-request-headers="SOAPAction">
        <domain uri="http://www.myanotherwebsite.com"/>
      </allow-from>
      <grant-to>
        <resource path="/" include-subpaths="true"/>
      </grant-to>
    </policy>
  </cross-domain-access>
</access-policy>

<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE cross-domain-policy SYSTEM 
"http://www.macromedia.com/xml/dtds/cross-domain-policy.dtd">
<cross-domain-policy>
  <allow-http-request-headers-from domain="*" headers="SOAPAction,Content-Type"/>
</cross-domain-policy>

Making a Service Available Across Domain Boundaries (MSDN)

Add a Service Reference to Silverlight

http://www.mywebsite.com/MyCoolWebService.asmx

Web Service Browser

View in Object Browser

Object of WebService1SoapClient

Design a simple SilverLight App

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;

namespace SilverlightApplication1
{
    public partial class MainPage : UserControl
    {
        public MainPage()
        {
            InitializeComponent();
        }

        private void btExecuteScalar_Click(object sender, RoutedEventArgs e)
        {
        }

        private void btExecuteNonQuery_Click(object sender, RoutedEventArgs e)
        {
        }
    }
}

public partial class MainPage : UserControl
{
    ServiceReference1.WebService1SoapClient myService;

    public MainPage()
    {
        InitializeComponent();
        myService = new ServiceReference1.WebService1SoapClient();
        myService.ExecuteScalarCompleted += myService_ExecuteScalarCompleted;
        myService.ExecuteNonQueryCompleted += myService_ExecuteNonQueryCompleted;
    }

    void myService_ExecuteNonQueryCompleted(object sender, 
                   ServiceReference1.ExecuteNonQueryCompletedEventArgs e)
    {
        MessageBox.Show(e.Result);
    }

    void myService_ExecuteScalarCompleted(object sender, 
         ServiceReference1.ExecuteScalarCompletedEventArgs e)
    {
        MessageBox.Show(e.Result);
    }

    private void btExecuteScalar_Click(object sender, RoutedEventArgs e)
    {
        myService.ExecuteScalarAsync(textBox1.Text);
    }

    private void btExecuteNonQuery_Click(object sender, RoutedEventArgs e)
    {
        myService.ExecuteNonQueryAsync(textBox1.Text);
    }
}

Testing

update the Service Reference