“system.invalidoperationexception was unhandled”on

我收到'InvalidOperationException was unhandled'。 con.Open（）;然后突出显示。“system.invalidoperationexception was unhandled”on

我的应用程序工作正常，如果我在.cs文件中使用连接字符串，但我得到异常，如果我把它放在web.config。尝试谷歌上的所有可用，但没有运气。

代码

using System.Configuration; 
using System.Web.Configuration; 

public DataSet GetInvoice() 
{ 
     SqlConnection con = new SqlConnection(); 
    con.ConnectionString =   WebConfigurationManager.ConnectionStrings["MyConnection"].ConnectionString; 

      DataSet ds = new DataSet(); 
      SqlDataAdapter da = new SqlDataAdapter("select * from invoice", con); 
      **con.Open();** 
      da.Fill(ds); 
      con.Close(); 
      return ds; 
     }

的Web.config

<connectionStrings>  
    <add name ="MyConnection" connectionString = "Data Source =.\\SQLEXPRESS; AttachDbFilename = C:\\USERS\\SALIL\\DOCUMENTS\\INVOICING.MDF ; Integrated Security = True" providerName="System.Data.SqlClient" /> 
    </connectionStrings>

StackTrack：

at System.Data.SqlClient.TdsParser.Connect(ServerInfo serverInfo, SqlInternalConnectionTds connHandler, Boolean ignoreSniOpenTimeout, Int64 timerExpire, Boolean encrypt, Boolean trustServerCert, Boolean integratedSecurity, SqlConnection owningObject) 
    at System.Data.SqlClient.SqlInternalConnectionTds.AttemptOneLogin(ServerInfo serverInfo, String newPassword, Boolean ignoreSniOpenTimeout, Int64 timerExpire, SqlConnection owningObject) 
    at System.Data.SqlClient.SqlInternalConnectionTds.LoginNoFailover(String host, String newPassword, Boolean redirectedUserInstance, SqlConnection owningObject, SqlConnectionString connectionOptions, Int64 timerStart) 
    at System.Data.SqlClient.SqlInternalConnectionTds.OpenLoginEnlist(SqlConnection owningObject, SqlConnectionString connectionOptions, String newPassword, Boolean redirectedUserInstance) 
    at System.Data.SqlClient.SqlInternalConnectionTds..ctor(DbConnectionPoolIdentity identity, SqlConnectionString connectionOptions, Object providerInfo, String newPassword, SqlConnection owningObject, Boolean redirectedUserInstance) 
    at System.Data.SqlClient.SqlConnectionFactory.CreateConnection(DbConnectionOptions options, Object poolGroupProviderInfo, DbConnectionPool pool, DbConnection owningConnection) 
    at System.Data.ProviderBase.DbConnectionFactory.CreatePooledConnection(DbConnection owningConnection, DbConnectionPool pool, DbConnectionOptions options) 
    at System.Data.ProviderBase.DbConnectionPool.CreateObject(DbConnection owningObject) 
    at System.Data.ProviderBase.DbConnectionPool.UserCreateRequest(DbConnection owningObject) 
    at System.Data.ProviderBase.DbConnectionPool.GetConnection(DbConnection owningObject) 
    at System.Data.ProviderBase.DbConnectionFactory.GetConnection(DbConnection owningConnection) 
    at System.Data.ProviderBase.DbConnectionClosed.OpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory) 
    at System.Data.SqlClient.SqlConnection.Open() 
    at WebInvoicing.Invoice.GetInvoice() in C:\WebInvoicing\WebInvoicing\Invoice.cs:line 220 
    at WebInvoicing.InvoiceApp.LoadGrid() in C:\WebInvoicing\WebInvoicing\InvoiceApp.aspx.cs:line 124 
    at WebInvoicing.InvoiceApp.Page_Load(Object sender, EventArgs e) in C:\WebInvoicing\WebInvoicing\InvoiceApp.aspx.cs:line 13 
    at System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) 
    at System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) 
    at System.Web.UI.Control.OnLoad(EventArgs e) 
    at System.Web.UI.Control.LoadRecursive() 
    at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)

来源

2012-09-23 Ani

欢迎来到StackOverflow。显示完整的回溯并不是很有用，特别是因为您不在代码示例中显示行号。 –

没有必要亚太经社会e web.config文件中的连接字符串中的斜杠。它应该是：

<connectionStrings>  
    <add name ="MyConnection" 
     connectionString = "Data Source =.\SQLEXPRESS; AttachDbFilename = C:\USERS\SALIL\DOCUMENTS\INVOICING.MDF ; Integrated Security = True" 
     providerName="System.Data.SqlClient" /> 
    </connectionStrings>

有关更多信息，请参见Handle backslash in the connection string。

来源

2012-09-23 22:30:24 akton

“system.invalidoperationexception was unhandled”on

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