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>