为文件附加自动命名数据库的尝试失败

Question

编译器给我这个错误:

为文件附加自动命名数据库的尝试失败。存在同名的数据库或无法打开指定的文件，或者该数据库位于UNC共享上。

我一直在阅读其他stackoverflow帖子，他们提到这可能是一个连接字符串问题，但我在linq编码，而不是ado.net代码。我不使用传统的连接字符串。实际上，为了访问所需的数据源，我必须使用名称空间来调用tableAdapter。

使用的代码如下:

using CustomerInvoices.MMABooksDataSetTableAdapters;

namespace CustomerInvoices
{

    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        MMABooksDataSet mmaBooksDataSet = new MMABooksDataSet();
        InvoicesTableAdapter invoicesTableAdapter = new InvoicesTableAdapter();
        CustomersTableAdapter customersTableAdapter =
        new CustomersTableAdapter();

        private void Form1_Load(object sender, EventArgs e)
        {
            invoicesTableAdapter.Fill(mmaBooksDataSet.Invoices);
            customersTableAdapter.Fill(mmaBooksDataSet.Customers);
            var invoices = from invoice in mmaBooksDataSet.Invoices
                           join customer in mmaBooksDataSet.Customers
                           on invoice.CustomerID equals customer.CustomerID
                           orderby customer.Name, invoice.InvoiceTotal descending
                           select new
                           {
                               customer.Name,
                               invoice.InvoiceID,
                               invoice.InvoiceDate,
                               invoice.InvoiceTotal
                           };
            string customerName = "";
            int i = 0;
            foreach (var invoice in invoices)
            {
                if (invoice.Name != customerName)
                {
                    lvInvoices.Items.Add(invoice.Name);
                    customerName = invoice.Name;
                }
                else
                {
                    lvInvoices.Items.Add("");
                }
                lvInvoices.Items[i].SubItems.Add(invoice.InvoiceTotal.ToString());
                lvInvoices.Items[i].SubItems.Add(Convert.ToDateTime
                (invoice.InvoiceDate).ToShortDateString());
                lvInvoices.Items[i].SubItems.Add
                (invoice.InvoiceTotal.ToString("c"));
                i += 1;
            }

        }
    }
}

Answer 1

我明白了。通过数据源，我进入连接属性窗口并找到连接路径文件，我将其更改为正确的

Data Source=localhostsqlexpress;Initial Catalog=MMABooks;Integrated Security=True

它奏效了。似乎错误是因为connectionString指向错误的路径文件。希望这对其他人有所帮助。谢谢你！