Visual Studio - 无法导入此数据库

Question

我正在尝试将条目插入到 Visual Studio 中的表中，但是在我运行代码然后尝试查看表后，我收到了此错误消息，

无法导入此数据库。它要么是不受支持的 SQL 服务器版本，要么是不受支持的数据库兼容性。

这是试图插入的代码，

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();
}

还有 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>

在 MyData.mdf 的属性中，构建操作设置为内容，复制到输出目录设置为复制（如果较新）。

在MyDataDataSet.xsd的属性中Build Action设置为None，Copy to Output Directory设置为Do not copy。

编辑

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

在这里

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

改成

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

或者像这样添加一个使用SqlConnentionStringBuilder的方法/函数

        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;
    }

然后像这样调用方法

SqlConnection connection = GetConnection()

当你点击数据库时，你应该像这样尝试 catch finally

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();
        }

Answer 2

在服务器资源管理器部分查看本地数据库的属性并检查连接字符串属性，如下所示 - "Data Source=(LocalDB)\MSSQLLocalDB;AttachDbFilename=C:\Users\DELL\source\repos\WindowsFormsApp2\WindowsFormsApp2\CarDb.mdf;Integrated Security=True"

将其复制并粘贴到您的 program.cs 的连接字符串中