我可以让我的程序按用户选择数据库吗？

Question

我需要在客户端和数据库中运行Windows窗体应用程序（C＃）。

我希望用户在程序中手动选择数据库（SQL Server 2005）。在这种情况下，数据库可以从一台PC更改为其他PC。

我需要避免连接字符串中的计算机名或IP编号或有用的东西。

这是如何实现的？

Answer 1

您可以使用下面的代码提示与构建连接字符串对话框用户 你可以找到原来的文章here。

/// <summary> 
/// Displays a Connection String Builder (DataLinks) dialog. 
/// 
/// Credits: 
/// http://www.codeproject.com/cs/database/DataLinks.asp 
/// http://www.codeproject.com/cs/database/DataLinks.asp?df=100&forumid=33457&select=1560237#xx1560237xx 
/// 
/// Required COM references: 
/// %PROGRAMFILES%\Microsoft.NET\Primary Interop Assemblies\adodb.dll 
/// %PROGRAMFILES%\Common Files\System\Ole DB\OLEDB32.DLL 
/// </summary> 
/// <param name="currentConnectionString">Previous database connection string</param> 
/// <returns>Selected connection string</returns> 
private string PromptForConnectionString(string currentConnectionString) 
{ 
    MSDASC.DataLinks dataLinks = new MSDASC.DataLinksClass(); 
    ADODB.Connection dialogConnection; 
    string generatedConnectionString = string.Empty; 

    if (currentConnectionString == String.Empty) 
    { 
     dialogConnection = (ADODB.Connection)dataLinks.PromptNew(); 
     generatedConnectionString = dialogConnection.ConnectionString.ToString(); 
    } 
    else 
    { 
     dialogConnection = new ADODB.Connection(); 
     dialogConnection.Provider = "SQLOLEDB.1"; 
     ADODB.Property persistProperty = dialogConnection.Properties["Persist Security Info"]; 
     persistProperty.Value = true; 

     dialogConnection.ConnectionString = currentConnectionString; 
     dataLinks = new MSDASC.DataLinks(); 

     object objConn = dialogConnection; 
     if (dataLinks.PromptEdit(ref objConn)) 
     { 
      generatedConnectionString = dialogConnection.ConnectionString.ToString(); 
     } 
    } 
    generatedConnectionString = generatedConnectionString.Replace("Provider=SQLOLEDB.1;", string.Empty); 
    if (
      !generatedConnectionString.Contains("Integrated Security=SSPI") 
      && !generatedConnectionString.Contains("Trusted_Connection=True") 
      && !generatedConnectionString.Contains("Password=") 
      && !generatedConnectionString.Contains("Pwd=") 
     ) 
     if(dialogConnection.Properties["Password"] != null) 
      generatedConnectionString += ";Password=" + dialogConnection.Properties["Password"].Value.ToString(); 

    return generatedConnectionString; 
} 

Answer 2

您可以根据用户选择更改计算机名称。我们之前已经做过，或者在app.config中有多个连接字符串，并使用用户选择从那里打开适当的连接字符串。

<connectionStrings> 
     <add name="Default" connectionString=".... 
     <add name="Second" connectionString=".... 
     ... 
</connectionStrings> 


m_connectionStringCollection = new Hashtable(); 

Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None); 
ConnectionStringsSection csSection = config.ConnectionStrings; 

for (int i = 0; i < ConfigurationManager.ConnectionStrings.Count; i++) 
{ 
    ConnectionStringSettings cs = csSection.ConnectionStrings[i]; 
    string connectionName = cs.Name; 
    m_connectionStringCollection.Add(connectionName, cs); 
} 

Answer 3

这个套房是你的吗？ http://support.microsoft.com/default.aspx?scid=kb;EN-US;310083

Answer 4

我推荐你使用连接字符串生成器，只是不断的部分存储在您的配置文件，从您的用户拉动休息。

http://msdn.microsoft.com/en-us/library/system.data.common.dbconnectionstringbuilder.aspx

System.Data.Common.DbConnectionStringBuilder builder = 
    new System.Data.Common.DbConnectionStringBuilder(); 
builder["Data Source"] = "(local)"; 
builder["integrated Security"] = true; 
builder["Initial Catalog"] = "AdventureWorks;NewValue=Bad"; 

Answer 5

微软已经发布了源代码上的代码库中的数据连接对话框。

这是一个blog post from Yaohai与更多的信息，这里是the home of Data Connection Dialog on Code Gallery。