我從配置文件傳入的連接字符串中收到了一些奇怪的行爲。我正在構建一個n層的網站(使用C#類庫和一個C#ASP.NET網站),並獲得了一個基本頁面,用於從數據庫(Microsoft SQL Server 2008)中提取一些數據,通過數據訪問和業務層,並將其顯示在網頁上。這在數據訪問層中使用硬編碼的連接字符串是成功的。來自web.config的連接字符串失敗,其中硬編碼字符串完全相同(使用C#的ASP.NET)
爲了改善體系結構,我將連接字符串移除到網站中的web.config文件。連接字符串已成功從web.config中檢索,但在使用此連接字符串調用.open()方法時連接失敗。
有了此構造,數據庫連接完美的作品:
public PathwayAccess() {
connectionString = "server=.\\MYSERVER;database=MyDatabase;Integrated Security=SSPI;";
}
具有以下,字符串檢索,可以寫出調試和看起來不錯,並沒有拋出異常:
編輯的web.config
<?xml version="1.0"?>
<configuration>
<system.web>
<compilation debug="false" targetFramework="4.0" />
<customErrors mode="Off"/>
</system.web>
<connectionStrings>
<clear/>
<add name="MySqlClientConnectionString"
providerName="System.Data.SqlClient"
connectionString="server=.\\MYSERVER;database=MyDatabase;Integrated Security=SSPI;" />
<!-- EDIT: problem was the escaped \ in the connection string:
should have been .\MYSERVER instead of .\\MYSERVER as
it doesn't need to be escaped in the config file -->
</connectionStrings>
</configuration>
和新構造我的數據訪問類:
public PathwayAccess() {
ConnectionStringSettingsCollection settings = ConfigurationManager.ConnectionStrings;
if (settings != null) {
foreach (ConnectionStringSettings cs in settings) {
if (cs.Name == "MySqlClientConnectionString" && cs.ProviderName == "System.Data.SqlClient") {
connectionString = cs.ConnectionString.ToString();
return;
}
}
throw new Exception("The SqlClient connection string named 'MySqlClientConnectionString' was not found in connection.config. "
+ "Found " + settings.Count + " connection strings");
} else {
throw new Exception("Could not retrieve the connection string from a configuration file. Check the connection strings section of the relevant config file");
}
}
但上面的第一個構造函數後,下面的代碼將工作,但之後的第二引發InvalidOperationException(有消息「實例失敗」):
myConnection = new SqlConnection(connectionString);
myConnection.Open();
我這個很疑惑 - 由於某些原因,配置文件中的連接字符串看起來與硬編碼的連接字符串相同,但行爲不同。任何想法可能會發生什麼?
請出示web.config中。 – 2011-05-09 08:58:11
它們是否包含任何*雙斜槓*? – V4Vendetta 2011-05-09 09:16:39
調試你的連接字符串。 btw:如果你只有一個cs,你可以使用它:connectionString = ConfigurationManager.ConnectionStrings [0] .ConnectionString或connectionString = ConfigurationManager.ConnectionStrings [「MySqlClientConnectionString」]。ConnectionString – ibram 2011-05-09 09:36:49