System.ComponentModel.Win32Exception：未找到网络路径错误
我在Visual Studio中创建了一个数据库，然后在我的代码中添加连接字符串
string connString = "Data Source=(LocalDB)v11.0;AttachDbFilename="D:POSApp_DataPOS.mdf";Integrated Security=True";
当我尝试从数据库获取数据时，我收到了这个异常
[Win32Exception（0x80004005）：未找到网络路径]
[SqlException（0x80131904）：建立与SQL Server的连接时发生网络相关或实例特定的错误。 服务器未找到或无法访问。 验证实例名称是否正确，并将SQL Server配置为允许远程连接。 （提供程序：命名管道提供程序，错误：40 - 无法打开与SQL Server的连接）]
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，字符串accessToken，布尔applyTransientFaultHandling）+970
System.Data.SqlClient.SqlConnectionFactory.CreateConnection（DbConnectionOptions选项，DbConnectionPoolKey poolKey，对象poolGroupProviderInfo，DbConnectionPool池，DbConnection拥有连接，DbConnectionOptions userOptions）+802
System.Data.ProviderBase.DbConnectionFactory.CreatePooledConnection（DbConnectionPool池，DbConnection owningObject，DbConnectionOptions选项，DbConnectionPoolKey poolKey，DbConnectionOptions userOptions）+38
System.Data.ProviderBase.DbConnectionPool.CreateObject（DbConnection owningObject，DbConnectionOptions userOptions，DbConnectionInternal oldConnection）+682
System.Data.ProviderBase.DbConnectionPool.UserCreateRequest（DbConnection owningObject，DbConnectionOptions userOptions，DbConnectionInternal oldConnection）+89
System.Data.ProviderBase.DbConnectionPool.TryGetConnection（DbConnection owningObject，UInt32 waitForMultipleObjectsTimeout，Boolean allowCreate，Boolean onlyOneCheckConnection，DbConnectionOptions userOptions，DbConnectionInternal＆connection）+426
System.Data.ProviderBase.DbConnectionPool.TryGetConnection（DbConnection owningObject，TaskCompletionSource 1 retry, DbConnectionOptions userOptions, DbConnectionInternal& connection) +78
System.Data.ProviderBase.DbConnectionFactory.TryGetConnection(DbConnection owningConnection, TaskCompletionSource1 retry, DbConnectionOptions userOptions, DbConnectionInternal& connection) +78
System.Data.ProviderBase.DbConnectionFactory.TryGetConnection(DbConnection owningConnection, TaskCompletionSource1 retry, DbConnectionOptions userOptions, DbConnectionInternal& connection) +78 1重试，DbConnectionOptions userOptions，DbConnectionInternal oldConnection，DbConnectionInternal＆connection）+191
System.Data.ProviderBase.DbConnectionFactory.TryGetConnection(DbConnection owningConnection, TaskCompletionSource
System.Data.ProviderBase.DbConnectionInternal.TryOpenConnectionInternal（的DbConnection
为什么你的Data Source = LocalDB中有一个prentesis）？
尝试这个：
string connString = "Data Source=(LocalDB)v11.0;AttachDbFilename="D:POSApp_DataPOS.mdf";Integrated Security=True";
更新更改
Data Source= (localdb)v11.0
至
Data Source= (localdb)v11.0
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