Question

我有这个非常基本的MVC4应用程序通过对象实体模型连接到数据库。应用程序和数据库之间的连接很好，因为用户能够登录并且Global.asax中的以下代码正在运行（它从数据库中成功检索用户角色。

protected void Application_AuthenticateRequest(object sender, EventArgs args)
    {
        if (User != null)
        {

            IEnumerable<CommonLayer.Roles> roles = new BusinessLayer.Roles().getAllUserRoles(Context.User.Identity.Name);

            string[] rolesArray = new string[roles.Count()];
            for (int i = 0; i < roles.Count(); i++)
            {
                rolesArray[i] = roles.ElementAt(i).RoleName;
            }

            GenericPrincipal gp = new GenericPrincipal(Context.User.Identity, rolesArray);
            Context.User = gp;
        }
    }

错误发生在以下行：

@if(User.IsInRole("Administrator"))
    {
       <span>testtttt</span>
    }

除了上述内容外，我还尝试了以下内容，但仍然遇到了同样的错误：

Roles.AddUserToRole("test.user","Administrator");

确切的错误是：

A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: SQL Network Interfaces, error: 26 - Error Locating Server/Instance Specified)

堆栈追踪：

[SqlException (0x80131904): A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: SQL Network Interfaces, error: 26 - Error Locating Server/Instance Specified)]
   System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction) +5340635
   System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj, Boolean callerHasConnectionLock, Boolean asyncClose) +244
   System.Data.SqlClient.TdsParser.Connect(ServerInfo serverInfo, SqlInternalConnectionTds connHandler, Boolean ignoreSniOpenTimeout, Int64 timerExpire, Boolean encrypt, Boolean trustServerCert, Boolean integratedSecurity, Boolean withFailover) +5350895
   System.Data.SqlClient.SqlInternalConnectionTds.AttemptOneLogin(ServerInfo serverInfo, String newPassword, SecureString newSecurePassword, Boolean ignoreSniOpenTimeout, TimeoutTimer timeout, Boolean withFailover) +145
   System.Data.SqlClient.SqlInternalConnectionTds.LoginNoFailover(ServerInfo serverInfo, String newPassword, SecureString newSecurePassword, Boolean redirectedUserInstance, SqlConnectionString connectionOptions, SqlCredential credential, TimeoutTimer timeout) +922
   System.Data.SqlClient.SqlInternalConnectionTds.OpenLoginEnlist(TimeoutTimer timeout, SqlConnectionString connectionOptions, SqlCredential credential, String newPassword, SecureString newSecurePassword, Boolean redirectedUserInstance) +307
   System.Data.SqlClient.SqlInternalConnectionTds..ctor(DbConnectionPoolIdentity identity, SqlConnectionString connectionOptions, SqlCredential credential, Object providerInfo, String newPassword, SecureString newSecurePassword, Boolean redirectedUserInstance, SqlConnectionString userConnectionOptions, SessionData reconnectSessionData) +518
   System.Data.SqlClient.SqlConnectionFactory.CreateConnection(DbConnectionOptions options, DbConnectionPoolKey poolKey, Object poolGroupProviderInfo, DbConnectionPool pool, DbConnection owningConnection, DbConnectionOptions userOptions) +5353705
   System.Data.ProviderBase.DbConnectionFactory.CreateNonPooledConnection(DbConnection owningConnection, DbConnectionPoolGroup poolGroup, DbConnectionOptions userOptions) +38
   System.Data.ProviderBase.DbConnectionFactory.TryGetConnection(DbConnection owningConnection, TaskCompletionSource`1 retry, DbConnectionOptions userOptions, DbConnectionInternal oldConnection, DbConnectionInternal& connection) +5355906
   System.Data.ProviderBase.DbConnectionInternal.TryOpenConnectionInternal(DbConnection outerConnection, DbConnectionFactory connectionFactory, TaskCompletionSource`1 retry, DbConnectionOptions userOptions) +146
   System.Data.ProviderBase.DbConnectionClosed.TryOpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory, TaskCompletionSource`1 retry, DbConnectionOptions userOptions) +16
   System.Data.SqlClient.SqlConnection.TryOpenInner(TaskCompletionSource`1 retry) +94
   System.Data.SqlClient.SqlConnection.TryOpen(TaskCompletionSource`1 retry) +110
   System.Data.SqlClient.SqlConnection.Open() +96
   System.Web.Management.SqlServices.GetSqlConnection(String server, String user, String password, Boolean trusted, String connectionString) +75

[HttpException (0x80004005): Unable to connect to SQL Server database.]
   System.Web.Management.SqlServices.GetSqlConnection(String server, String user, String password, Boolean trusted, String connectionString) +130
   System.Web.Management.SqlServices.SetupApplicationServices(String server, String user, String password, Boolean trusted, String connectionString, String database, String dbFileName, SqlFeatures features, Boolean install) +89
   System.Web.Management.SqlServices.Install(String database, String dbFileName, String connectionString) +27
   System.Web.DataAccess.SqlConnectionHelper.CreateMdfFile(String fullFileName, String dataDir, String connectionString) +386

Screenshot of the error in more detail

Answer 1

我之前使用123456789012345678900000000000 12345678901234567890000000000 1234567890123456789000000000 123456789012345678900000000 12345678901234567890000000 1234567890123456789000000 123456789012345678900000 12345678901234567890000 1234567890123456789000 123456789012345678900 12345678901234567890 1234567890123456789 123456789012345678.9 12345678901234567.89 1234567890123456.789 123456789012345.6789 12345678901234.56789 1234567890123.456789 123456789012.3456789 12345678901.23456789 1234567890.123456789 123456789.0123456789 12345678.90123456789 1234567.890123456789 123456.7890123456789 12345.67890123456789 1234.567890123456789 123.4567890123456789 12.34567890123456789 1.234567890123456789 0.1234567890123456789 0.01234567890123456789 0.001234567890123456789 0.0001234567890123456789 0.00001234567890123456789 0.000001234567890123456789 0.0000001234567890123456789 0.00000001234567890123456789 0.000000001234567890123456789 0.0000000001234567890123456789 0.00000000001234567890123456789但已更改为使用基于SimpleMembership的{{1}}的应用程序存在同样的问题。将以下内容添加到我的Single Sign-on为我解决了问题：

Owin Authentication Middleware

Answer 2

不久前遇到了类似的问题。正在使用多个项目解决方案。能够无问题地进行身份验证的用户;当他们去更新他们的用户档案时，他们会得到你提到的错误。

最后，我们发现Visual Studio已将连接字符串插入到指向开发环境数据库的基础结构项目的app.config中，该数据库无法从生产环境中访问。

我们从App.config中删除了连接字符串设置，重新部署，之后生活很好。

multiple projects solutions

Answer 3

您的错误明确指出您尝试使用需要它来创建文件并将其附加到服务器的本地SQL Express实例。

您可以查看以下内容：

运行应用程序的帐户是否具有读/写访问权限有问题的目录？（默认为App_Data）
您是否正确配置了连接字符串？

如果查看InitializeDatabaseConnection的方法签名（用于设置角色和成员资格提供程序），则为：

public static void InitializeDatabaseConnection(string connectionStringName, string userTableName, string userIdColumn, string userNameColumn, bool autoCreateTables);

连接字符串需要一个“常规”连接字符串，而不是Entity Framework的Db / Model第一个模式生成的连接字符串。

我还注意到您正在使用用户test.user。 SimpleMembershipProvider和SimpleRoleProvider使用字符串连接来构建查询。你在那里的时期可能会导致问题。你可以在没有这段时间的情况下进行测试吗？

Answer 4

看起来您正在使用ASP.NET成员资格提供程序，它可以指定不同的连接字符串。验证您是否指向正确的连接字符串。见Configuring an ASP.NET Application to Use Membership

Answer 5

尝试在两种情况下打破GetSqlConnection（...）以查看传递的参数。

Answer 6

如果您未在machine.config中指定，则您正在使用的角色提供程序将从web.config文件中获取配置。这将导致您的应用在LocalSql中创建App_Data数据库。连接字符串和提供商详细信息在machine.config中指定，因此您的web.config只会添加或删除它们。例如，您的machine.config可能会说：

<connectionStrings>
    <add name="LocalSqlServer" connectionString="..."/>
</connectionStrings>

你的web.config有这个：

<connectionStrings>
    <add name="MyConnectionString" connectionString="..."/>
</connectionStrings>

您的应用程序将能够查看和使用两个字符串。要修复它，您可以首先清除连接字符串，如下所示：

<connectionStrings>
    <clear />
    <add name="MyConnectionString" connectionString="..."/>
</connectionStrings>

但这仍然存在需要在web.config中设置您的角色提供程序的根本问题。为此，请添加以下内容：

<system.web>
    <roleManager>
        <providers>
            <clear/>
            <add name="AspNetSqlRoleProvider" connectionStringName="<your connection string name here>" applicationName="/" type="System.Web.Security.SqlRoleProvider, System.Web, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" />
        </providers>
    </roleManager>
</system.web>

此处的关键部分可能只是</clear>行，它会删除machine.config继承中的所有内容。或者，您可以像这样指定默认提供程序：

<roleManager defaultProvider="MyProvider">
    <providers>
        <add name="MyProvider" ......>
        ...etc...

User.IsInRole抛出与网络相关或特定于实例的错误

6 个答案: