Data Connection Dialog （直接调用内置数据源连接对话框）

winform程序，在发布时往往需要更改数据库连接字符串，而数据库采用附加的方式配置数据库连接字符串，可以使用VS2005的配置界面来处理 

引用C:/Program Files/Microsoft Visual Studio 8/Common7/IDE 里面的Microsoft.Data.ConnectionUI.Dialog.dll。

 

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-->using Microsoft.Data.ConnectionUI;
private void button1_Click(object sender, EventArgs e)
        {
            DataConnectionDialog dia=new DataConnectionDialog ();

            dia.DataSources.Add(DataSource.SqlDataSource);
            dia.SelectedDataProvider = DataProvider.SqlDataProvider;
            if (DataConnectionDialog.Show(dia, this) == DialogResult.OK )
            {
                string myConnect = dia.ConnectionString;
                MessageBox.Show(myConnect);
             }
          
        }
        }

为了保存数据库字符串，我们需要更改VS的配置文档（程序的connectString在配置文件内）。.exe文件的配置文件为.exe.config；在同一目录下

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-->XmlDocument myDoc = new XmlDocument();
                XmlElement myXmlElement;
                myDoc.Load(Application.ExecutablePath + ".config");
                XmlNode myNode = myDoc.SelectSingleNode("//connectionStrings");
                myXmlElement = (XmlElement)myNode.SelectSingleNode("//add [@name='NXY.Properties.Settings.nxyInfoConnectionString']");
                myXmlElement.SetAttribute("connectionString", myConnect);
                myDoc.Save(Application.ExecutablePath + ".config");

相对应的XML文件

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--><?xml version="1.0" encoding="utf-8" ?>
<configuration>
    <configSections>
    </configSections>
    <connectionStrings>
        <add name="NXY.Properties.Settings.nxyInfoConnectionString" connectionString="Data Source=SC440;Initial Catalog=nxyInfo;Persist Security Info=True;User ID=sa;Password=sa"
            providerName="System.Data.SqlClient" />
    </connectionStrings>
</configuration>