用戶代碼未處理的sqlexception

我嘗試加載我的網頁時遇到此錯誤。任何人都可以建議是什麼原因導致這種情況發生和補救？用戶代碼未處理的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: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server

這是C＃代碼

string conStr = ConfigurationManager.ConnectionStrings["MSSQLConnectionString"].ConnectionString; 

SqlConnection connection = new SqlConnection(conStr); 

string strSqlCmd; 
string strSqlCmd2; 

strSqlCmd = "INSERT INTO User " + "(UserName, UserPwd, email, address, mobileNo, firstname, lastname, dateofBirth, NRIC, gender)"; 
strSqlCmd += " VALUES (@Username, @Userpwd, @email, @address, @mobileNo, @firstName, @lastName, @DateOfBirth, @nric, @gender)"; 

strSqlCmd2 = "INSERT INTO Patient " + "(Allergies, Childhoodillness)"; 
strSqlCmd2 += "VALUES(@allergies, @Childhood_illness)"; 

//create command and assign the query and connection from the constructor 
SqlCommand cmd = new SqlCommand(strSqlCmd, connection); 
SqlCommand cmd2 = new SqlCommand(strSqlCmd2, connection); 

cmd.Parameters.AddWithValue("@Username", UserName.Text); 
cmd.Parameters.AddWithValue("@Userpwd", Password.Text); 
cmd.Parameters.AddWithValue("@email", Email.Text); 
cmd.Parameters.AddWithValue("@address", Address.Text); 
cmd.Parameters.AddWithValue("@mobileNo", MobileNo.Text); 
cmd.Parameters.AddWithValue("@firstName", Password.Text); 
cmd.Parameters.AddWithValue("@lastName", Password.Text); 
cmd.Parameters.AddWithValue("@DateOfBirth", DOB.Text); 
cmd.Parameters.AddWithValue("@nric", NRIC.Text); 
cmd.Parameters.AddWithValue("@gender", Gender.Text); 

cmd2.Parameters.AddWithValue("@allergies", Allergies.Text); 
cmd2.Parameters.AddWithValue("@Childhood_illness", ChildhoodIllness.Text); 

connection.Open(); 
cmd.ExecuteNonQuery(); 
cmd2.ExecuteNonQuery(); 
connection.Close();

這是web.config代碼

<add name="MSSQLConnectionString" 
    connectionString="Server=localhost; Database= App_Data\PMS.mdf ; Integrated Security=True" 
    providerName="System.Data.SqlClient" />

來源

2014-10-10 user2080330

「服務器未找到或無法訪問」似乎很明顯。 – 2014-10-10 20:20:57

嘗試在這篇文章中建議的步驟，它可能有所幫助：http://ricardodsanchez.com/2012/04/05/how-to-configure-sql-express-to-accept-remote-connections/ – 2014-10-10 20:21:20

不確定，但我不認爲你直接引用數據庫文件。至少我從來不必這樣做。也許localhost應該是實際的實例名稱。 – RadioSpace 2014-10-10 20:25:49

此錯誤是自我解釋，這意味着存在與您的連接字符串錯誤。您可能會解決錯誤的服務器名稱或無效的數據庫名稱。另外，如果所有這些都可以，您可以查看配置管理器並檢查SQL Server是否準備好接受遠程請求。（這是遠程僅在連接。）

你可以得到有用的提示有關下列URL連接字符串： http://www.connectionstrings.com/

來源

2015-04-08 12:38:29

這是本地MDF數據庫不正確的連接字符串。嘗試類似;

<add name="MSSQLConnectionString" 
connectionString="Data Source=(LocalDB)\v11.0;AttachDbFilename=|DataDirectory|PMS.mdf;Integrated Security=True;" 
providerName="System.Data.SqlClient" />

或者

<add name="MSSQLConnectionString" 
connectionString="Data Source=.\MSSQLSERVER;AttachDbFilename=|DataDirectory|PMS.mdf;Integrated Security=True;" 
providerName="System.Data.SqlClient" />

或已安裝任何其他實例。

來源

2015-04-08 13:14:40

用戶代碼未處理的sqlexception

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