Question

我在C＃项目中使用SQL数据库，我想让多个用户可以访问它。我已经检查过，它确实处于多用户模式，但我仍然收到一个错误，告诉我我无法连接同一个数据库中的多个用户。有谁知道我能做些什么来解决它？可能是代码有问题吗？

使用Linq进行数据库访问：

var queryline = from anmeldung in context.Accounts
                            where anmeldung.Benutzername == BN
                            where anmeldung.Passwort == PW
                            select anmeldung.Id;

App.config中：

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
    <configSections>
    </configSections>
    <connectionStrings>
        <add name="DBtest.Properties.Settings.TestConnectionString" connectionString="Data Source=(LocalDB)\MSSQLLocalDB;AttachDbFilename=|DataDirectory|\Test.mdf;Integrated Security=True;Connect Timeout=10"
            providerName="System.Data.SqlClient" />
    </connectionStrings>
    <startup> 
        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5" />
    </startup>
</configuration>

错误消息：

System.Data.SqlClient.SqlException HResult = 0x80131904 Nachricht =   连接到SQL时与网络相关或特定于实例的错误   服务器。找不到或无法访问服务器。验证   实例名称是正确的，SQL Server允许远程   连接..（提供者：命名管道提供者，错误：40 - Verbindung   mit SQL Server konntenichtgeöffnetwerden）Quelle = .Net SqlClient   数据提供商Stapelüberwachung：bei   System.Data.SqlClient.SqlInternalConnectionTds..ctor（DbConnectionPoolIdentity   identity，SqlConnectionString connectionOptions，SqlCredential   凭证，Object providerInfo，String newPassword，SecureString   newSecurePassword，Boolean redirectedUserInstance，SqlConnectionString   userConnectionOptions，SessionData reconnectSessionData，   DbConnectionPool池，String accessToken，Boolean   applyTransientFaultHandling）bei   System.Data.SqlClient.SqlConnectionFactory.CreateConnection（DbConnectionOptions   options，DbConnectionPoolKey poolKey，Object poolGroupProviderInfo，   DbConnectionPool池，DbConnection owningConnection，   DbConnectionOptions userOptions）bei   System.Data.ProviderBase.DbConnectionFactory.CreatePooledConnection（类DBConnectionPool   pool，DbConnection owningObject，DbConnectionOptions选项，   DbConnectionPoolKey poolKey，DbConnectionOptions userOptions）bei   System.Data.ProviderBase.DbConnectionPool.CreateObject（的DbConnection   owningObject，DbConnectionOptions userOptions，DbConnectionInternal   oldConnection）bei   System.Data.ProviderBase.DbConnectionPool.UserCreateRequest（的DbConnection   owningObject，DbConnectionOptions userOptions，DbConnectionInternal   oldConnection）bei   System.Data.ProviderBase.DbConnectionPool.TryGetConnection（的DbConnection   owningObject，UInt32 waitForMultipleObjectsTimeout，Boolean   allowCreate，Boolean onlyOneCheckConnection，DbConnectionOptions   userOptions，DbConnectionInternal＆amp;连接）bei   System.Data.ProviderBase.DbConnectionPool.TryGetConnection（的DbConnection   owningObject，TaskCompletionSource 1 retry, DbConnectionOptions userOptions, DbConnectionInternal& connection) bei System.Data.ProviderBase.DbConnectionFactory.TryGetConnection(DbConnection owningConnection, TaskCompletionSource 1重试，DbConnectionOptions   userOptions，DbConnectionInternal oldConnection，DbConnectionInternal＆amp;   连接）bei   System.Data.ProviderBase.DbConnectionInternal.TryOpenConnectionInternal（的DbConnection   outerConnection，DbConnectionFactory connectionFactory，   TaskCompletionSource 1 retry, DbConnectionOptions userOptions) bei System.Data.ProviderBase.DbConnectionClosed.TryOpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory, TaskCompletionSource 1次重试，DbConnectionOptions userOptions）bei   System.Data.SqlClient.SqlConnection.TryOpenInner（TaskCompletionSource 1 retry) bei System.Data.SqlClient.SqlConnection.TryOpen(TaskCompletionSource 1   重试）bei System.Data.SqlClient.SqlConnection.Open（）bei   System.Data.Linq.SqlClient.SqlConnectionManager.UseConnection（IConnectionUser   user）bei System.Data.Linq.SqlClient.SqlProvider.get_IsSqlCe（）
  bei System.Data.Linq.SqlClient.SqlProvider.InitializeProviderMode（）
  北   System.Data.Linq.SqlClient.SqlProvider.System.Data.Linq.Provider.IProvider.Execute（表达式   查询）bei   System.Data.Linq.DataQuery`1.System.Collections.Generic.IEnumerable.GetEnumerator（）   bei DBtest.Program.Register（Int32＆amp; ID）in   \ 192.168.2.1 \ Share \ DBtest \ DBtest \ Program.cs：Zeile61 bei   DBtest.Program.Main（String [] args）in   \ 192.168.2.1 \ Share \ DBtest \ DBtest \ Program.cs：Zeile102

Innere Ausnahme 1：Win32Exception：DasZeitlimitfürdieSemaphore   wurde erreicht

即使多用户处于活动状态，SQL DB也只能由单个用户访问

0 个答案: