无法使用连接字符串连接到本地 SQL 服务器数据库，但 VS 可以

Question

我正在尝试使用连接字符串通过 Visual Studio 15 连接到本地 Sql Server 2012 数据库实例。虽然我已经能够通过 Visual Studio SQL 服务器对象资源管理器和运行测试程序成功连接到数据库，但我无法在我的项目中使用连接字符串这样做.

这是 SQL 服务器对象资源管理器

给出的我的连接字符串

<connectionStrings>    
  <add name="objConnLocal" 
connectionString="Data Source=DESKTOPIVO;Integrated Security=True;Initial Catalog=tnk;Connect Timeout=15;Encrypt=False;TrustServerCertificate=False;ApplicationIntent=ReadWrite;MultiSubnetFailover=False;"providerName="System.Data.SqlClient"/>
</connectionStrings>

这是我的代码，可以完美地使用 Azure 给定的连接字符串连接到 Azure 数据库（代码有效）

public class DbConn
{

public static string DatabaseConnectionString = System.Configuration.ConfigurationManager.ConnectionStrings["objConnLocal"].ConnectionString;
    public static SqlConnection objConn = new sqlConnection(DatabaseConnectionString);



public void spCMSSelectTest(out DataSet ds)
{
    ds = new DataSet("buttons");
    SqlDataAdapter objDataAdapter = new SqlDataAdapter();
    SqlCommand cmd = new SqlCommand("spCMSSelectTest", DbConn.objConn);
    cmd.CommandType = CommandType.StoredProcedure;
    cmd.Connection.Open();
    objDataAdapter.SelectCommand = cmd;
    objDataAdapter.Fill(ds);
    cmd.Connection.Close();
}
}

这是我要连接的数据库：

这是我尝试访问的测试页面：

 protected void Page_Load(object sender, EventArgs e)
{
    DataSet ds;
    try
    { 
    dbc.spCMSSelectTest(out ds);

        lblTest.Text = ds.Tables[0].Rows.Count.ToString();
    }
    catch (Exception easd)
    {
        lblTest.Text = easd.ToString();
    }

}

我一直在此处和 google 上寻找答案，但似乎对我没有任何帮助。我错过了什么？

编辑：有错误：

System.Data.SqlClient.SqlException (0x80131904): Login failed for user 'IIS APPPOOL\DefaultAppPool'. at System.Data.SqlClient.SqlInternalConnectionTds..ctor(DbConnectionPoolIdentity identity, SqlConnectionString connectionOptions, SqlCredential credential, Object providerInfo, String newPassword, SecureString newSecurePassword, Boolean redirectedUserInstance, SqlConnectionString userConnectionOptions, SessionData reconnectSessionData, DbConnectionPool pool, String accessToken, Boolean applyTransientFaultHandling) at System.Data.SqlClient.SqlConnectionFactory.CreateConnection(DbConnectionOptions options, DbConnectionPoolKey poolKey, Object poolGroupProviderInfo, DbConnectionPool pool, DbConnection owningConnection, DbConnectionOptions userOptions) at System.Data.ProviderBase.DbConnectionFactory.CreatePooledConnection(DbConnectionPool pool, DbConnection owningObject, DbConnectionOptions options, DbConnectionPoolKey poolKey, DbConnectionOptions userOptions) at System.Data.ProviderBase.DbConnectionPool.CreateObject(DbConnection owningObject, DbConnectionOptions userOptions, DbConnectionInternal oldConnection) at System.Data.ProviderBase.DbConnectionPool.UserCreateRequest(DbConnection owningObject, DbConnectionOptions userOptions, DbConnectionInternal oldConnection) at System.Data.ProviderBase.DbConnectionPool.TryGetConnection(DbConnection owningObject, UInt32 waitForMultipleObjectsTimeout, Boolean allowCreate, Boolean onlyOneCheckConnection, DbConnectionOptions userOptions, DbConnectionInternal& connection) at System.Data.ProviderBase.DbConnectionPool.TryGetConnection(DbConnection owningObject, TaskCompletionSource1 retry, DbConnectionOptions userOptions, DbConnectionInternal& connection) at System.Data.ProviderBase.DbConnectionFactory.TryGetConnection(DbConnection owningConnection, TaskCompletionSource1 retry, DbConnectionOptions userOptions, DbConnectionInternal oldConnection, DbConnectionInternal& connection) at System.Data.ProviderBase.DbConnectionInternal.TryOpenConnectionInternal(DbConnection outerConnection, DbConnectionFactory connectionFactory, TaskCompletionSource1 retry, DbConnectionOptions userOptions) at System.Data.SqlClient.SqlConnection.TryOpenInner(TaskCompletionSource1 retry) at System.Data.SqlClient.SqlConnection.TryOpen(TaskCompletionSource`1 retry) at System.Data.SqlClient.SqlConnection.Open() at DbConn.spCMSSelectTest(DataSet& ds) in c:\inetpub\wwwroot\CMS\App_Code\DbConn.cs:line 22 at index.Page_Load(Object sender, EventArgs e) in c:\inetpub\wwwroot\CMS\index2.aspx.cs:line 18 ClientConnectionId:d576fae4-db3d-451d-8436-2abe003c01f0 Error Number:18456,State:1,Class:14

Answer 1

您缺少数据库。

将 Initial Catalog=tnk 添加到您的连接字符串。

Answer 2

您正在以可信用户身份登录（默认）- 该用户是池用户 IIS APPPOOL\DefaultAppPool 您需要以您的身份登录，或者 SQL 登录。因为它在运行在池下时使用的凭据与在桌面上使用的凭据不同。

无法使用连接字符串连接到本地 SQL 服务器数据库，但 VS 可以

Can't connect to local SQL Server DB with connection string, but VS can

c#

sql-server

connection-string

visual-studio