Visual Studio-无法导入此数据库

Question

I'm trying to insert an entry into a table in visual studio, but after I run my code and then try to view the table I get this error message,

This database cannot be imported. It is either an unsupported SQL server version or an unsupported database compatibility.

Here is the code that is attempting to insert,

private void doneButton_Click(object sender, EventArgs e) {
    string userName = userNameTextBox.Text,             
        password = passwordTextBox.Text,
        question = questionMenu.Text,
        answer = answerTextBox.Text;
        int key = EncryptionClass.generateKey();

    SqlConnection connection = new SqlConnection(@"Data Source=(LocalDB)\MSSQLLocalDB;AttachDbFilename=|DataDirectory|\MyData.mdf;Integrated Security=True");

    connection.Open();

    String sqlQuery = "INSERT INTO dbo.Account(UserName, UserPassword, UserKey) " +    
           "VALUES (\'" + userName + "\', \'" + EncryptionClass.encrypt(password, key) + "\', " + key + ");";

    Console.WriteLine("string " + sqlQuery);
    // INSERT INTO dbo.Account(UserName, UserPassword, UserKey) VALUES ('victoramaro', 'obvmhkT1', 19);

    using (SqlCommand command = new SqlCommand(sqlQuery, connection)) {
        try {
            var res = command.ExecuteNonQuery();
        } catch (SqlException ex) {
            Console.WriteLine(ex.Message);
        }
    }
        connection.Close();
}

And the App.config,

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
    <configSections>
    </configSections>
    <connectionStrings>
        <add name="Assign6.Properties.Settings.MyDataConnectionString"
            connectionString="Data Source=(LocalDB)\MSSQLLocalDB;AttachDbFilename=|DataDirectory|\MyData.mdf;Integrated Security=True"
            providerName="System.Data.SqlClient" />   
    </connectionStrings>
    <startup> 
        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.6.1" />
    </startup>
</configuration>

In the properties of MyData.mdf Build Action is set to Content, Copy to Output Directory is set to Copy if newer.

In the properties of MyDataDataSet.xsd Build Action is set to None, Copy to Output Directory is set to Do not copy.

EDIT

SqlConnection connection = new SqlConnection("Data Source=(LocalDB)\\MSSQLLocalDB;AttachDbFilename=|DataDirectory|\\MyData.mdf;Integrated Security=True");

connection.Open();


String sqlQuery = "INSERT INTO dbo.Account(UserName, UserPassword, UserKey) " +     //create insert query to insert user data into Account table
                        "VALUES (\'" + userName + "\', \'" + EncryptionClass.encrypt(password, key) + "\', " + key + ");";

using (SqlCommand command = new SqlCommand(sqlQuery, connection)) {
        try {
           command.ExecuteNonQuery();



            string selectStatement = "SELECT * FROM Account";

            SqlCommand selectCommand = new SqlCommand(selectStatement, connection);
            SqlDataReader sqlReader = selectCommand.ExecuteReader();             //execute the query 

            while (sqlReader.Read()) {                                         //while reader has data
                string outString = string.Empty;
                for (int k = 0; k < sqlReader.FieldCount; k++) {                //go throught the field count
                    outString += String.Format("{0, -8}", sqlReader[k]);        //add item to string
                }
                Console.WriteLine(outString);
            }

        }
        catch (SqlException ex) {
            throw ex;
        }
        finally {
            connection.Close();
        }
    }

Answer 1

in here

    SqlConnection connection = new SqlConnection(@"Data Source=(LocalDB)\MSSQLLocalDB;AttachDbFilename=|DataDirectory|\MyData.mdf;Integrated Security=True");

change to

    SqlConnection connection = new SqlConnection("Data Source=(LocalDB)\\MSSQLLocalDB;AttachDbFilename=|DataDirectory|\\MyData.mdf;Integrated Security=True");

or add a method/function that uses the SqlConnentionStringBuilder like this

        public static SqlConnection GetConnection()
    {
        SqlConnectionStringBuilder connectionString = new SqlConnectionStringBuilder();
        connectionString.DataSource = "(localdb)\\MSSQLLocalDB";
        connectionString.AttachDBFilename = "|DataDirectory|\\MyData.mdf";
        connectionString.IntegratedSecurity = true;
        string connectString = connectionString.ConnectionString;

        SqlConnection connection = new SqlConnection(connectString);
        return connection;
    }

and then call the method like this

SqlConnection connection = GetConnection()

and when you hit the database you should have a try catch finally like this

try
        {
            connection.Open();
            insertCommand.ExecuteNonQuery();
            string selectStatement =
                "SELECT IDENT_CURRENT('TableName') FROM TableName";
            SqlCommand selectCommand = new SqlCommand(selectStatement, connection);
            int vendorID = Convert.ToInt32(selectCommand.ExecuteScalar());
            return vendorID;
        }
        catch (SqlException ex)
        {
            throw ex;
        }
        catch (Exception ex)
        {
            throw ex;
        }
        finally
        {
            connection.Close();
        }