Question

我试图制作简单的注册表单我希望将文本框中的数据插入到DataSet中这里的表是我的WebForm代码：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;
using System.Data.Sql;
using System.Configuration;
using System.Data.SqlClient;


namespace IknowyourbrainWebSite
{
    public partial class WebForm1 : System.Web.UI.Page
    {
        SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString);


        protected void Page_Load(object sender, EventArgs e)
        {
            con.Open();
        }

        protected void Button2_Click(object sender, EventArgs e)
        {
            SqlCommand cmd = new SqlCommand("insert into tbl values('"+TxtUserName.Text+"','"+TxtPassword.Text+"','"+TxtRePassword.Text+"')", con);
            cmd.ExecuteNonQuery();
            con.Close();
            TxtUserName.Text = "";
            TxtPassword.Text = "";
            TxtRePassword.Text = "";


        }
    }
}

当我开始它时，我收到了一个错误：

Server Error in '/' Application.
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) 
 Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. 

 Exception Details: System.Data.SqlClient.SqlException: 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)

Source Error: 

Line 20:         protected void Page_Load(object sender, EventArgs e)
Line 21:         {
Line 22:             con.Open();
Line 23:         }
Line 24: 


 Source File:  c:\Users\Fluksikarton\Documents\Visual Studio 2012\Projects\IknowyourbrainWebSite\IknowyourbrainWebSite\WebForm1.aspx.cs    Line:  22 

Stack Trace: 

[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) +5295167
   System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj, Boolean callerHasConnectionLock, Boolean asyncClose) +242
   System.Data.SqlClient.TdsParser.Connect(ServerInfo serverInfo, SqlInternalConnectionTds connHandler, Boolean ignoreSniOpenTimeout, Int64 timerExpire, Boolean encrypt, Boolean trustServerCert, Boolean integratedSecurity, Boolean withFailover) +5307115
   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) +920
   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) +434
   System.Data.SqlClient.SqlConnectionFactory.CreateConnection(DbConnectionOptions options, DbConnectionPoolKey poolKey, Object poolGroupProviderInfo, DbConnectionPool pool, DbConnection owningConnection, DbConnectionOptions userOptions) +225
   System.Data.ProviderBase.DbConnectionFactory.CreatePooledConnection(DbConnectionPool pool, DbConnectionOptions options, DbConnectionPoolKey poolKey, DbConnectionOptions userOptions) +37
   System.Data.ProviderBase.DbConnectionPool.CreateObject(DbConnectionOptions userOptions) +558
   System.Data.ProviderBase.DbConnectionPool.UserCreateRequest(DbConnectionOptions userOptions) +67
   System.Data.ProviderBase.DbConnectionPool.TryGetConnection(DbConnection owningObject, UInt32 waitForMultipleObjectsTimeout, Boolean allowCreate, Boolean onlyOneCheckConnection, DbConnectionOptions userOptions, DbConnectionInternal& connection) +1052
   System.Data.ProviderBase.DbConnectionPool.TryGetConnection(DbConnection owningObject, TaskCompletionSource`1 retry, DbConnectionOptions userOptions, DbConnectionInternal& connection) +78
   System.Data.ProviderBase.DbConnectionFactory.TryGetConnection(DbConnection owningConnection, TaskCompletionSource`1 retry, DbConnectionOptions userOptions, DbConnectionInternal& connection) +167
   System.Data.ProviderBase.DbConnectionClosed.TryOpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory, TaskCompletionSource`1 retry, DbConnectionOptions userOptions) +143
   System.Data.SqlClient.SqlConnection.TryOpen(TaskCompletionSource`1 retry) +83
   System.Data.SqlClient.SqlConnection.Open() +96
   IknowyourbrainWebSite.WebForm1.Page_Load(Object sender, EventArgs e) in c:\Users\Fluksikarton\Documents\Visual Studio 2012\Projects\IknowyourbrainWebSite\IknowyourbrainWebSite\WebForm1.aspx.cs:22
   System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +51
   System.Web.UI.Control.OnLoad(EventArgs e) +92
   System.Web.UI.Control.LoadRecursive() +54
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +772
enter code here

这个错误是否可能是因为我的公共IP不是静态的这个事实我的意思是动态的，据我所知它每次重新启动我的路由器或调制解调器或者我的代码中的任何地方或问题都会改变/选项

这是我在web.config中的connecton字符串代码：

<configuration>
    <connectionStrings>
        <add name="ConnectionString" connectionString="Data Source=|DataDirectory|\RegistrationDataBase.sdf"
            providerName="System.Data.SqlServerCe.4.0" />
    </connectionStrings>
    <system.web>
      <compilation debug="true" targetFramework="4.5" />
      <httpRuntime targetFramework="4.5" />
    </system.web>


</configuration>

Answer 1

如果未正确设置连接字符串，则通常会触发此错误。您是否验证了它是正确的，因为服务器名称和实例是否正确，凭据是否正确并且您的服务器是否设置为接收远程连接（假设它与您的代码不在同一个框中）？

Answer 2

rror通常是一个错误的连接字符串。请检查一下。

为什么不像这样重写Button2_Click。

protected void Button2_Click(object sender, EventArgs e)
{
            SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString);
        con.Open();
        SqlCommand cmd = new SqlCommand("insert into tbl values('"+TxtUserName.Text+"','" + TxtPassword.Text+"','"+TxtRePassword.Text+"')", con);
        cmd.ExecuteNonQuery();
        con.Close();
        TxtUserName.Text = "";
        TxtPassword.Text = "";
        TxtRePassword.Text = "";

}

一些好的起点：

How to check if connection string is valid?

或

http://www.connectionstrings.com/

阅读您获得的实际错误

[SqlException（0x80131904）：与网络相关或特定于实例的建立与SQL Server的连接时发生错误。该服务器未找到或无法访问。验证该实例名称是正确的，并且SQL Server配置为允许远程连接。（提供者：SQL网络接口，错误：26 - 错误找到指定的服务器/实例）]

解决我的连接字符串问题

2 个答案: