C#数据库选择

Question

我有两个数据库。第一个通过 ListBox 显示，第二个通过 ListView 显示。我希望能够根据所选 ListBox 元素在 ListView 中显示一些信息，但我的代码不起作用。

private void DpListBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
    L.InitReadOnly(false, NameF, LastNameF, AgeF, DepartmentF, ProfessionF, SalaryF);
    L.InitReadOnly(false, Name4, LastName4, Age4, Department4, Profession4, Salary4);
    int counter = 0;
    IEnumerable<Employee> critCareEmp;
    critCareEmp = L.EmpUpdate(counter, Emp, DpListBox, Ep);

    SqlConnection connection = new SqlConnection(connectionString);
    SqlDataAdapter adapter = new SqlDataAdapter();
    Console.WriteLine(DpListBox.SelectedValue.ToString());
    SqlCommand command = new SqlCommand($@"SELECT * FROM Employee WHERE Dep_nt={DpListBox.SelectedValue}", connection);
    adapter.SelectCommand = command;
    DataTable dataTable1 = new DataTable();
    adapter.Fill(dataTable1);
    Ep.ItemsSource = dataTable1.DefaultView;
}

好像我需要DpListBox.SelectedValue是某种字符串，但不是。

Answer 1

SqlCommand command = new SqlCommand
        ($@"SELECT * FROM Employee WHERE Dep_nt="+ 
           DpListBox.SelectedValue.ToString(), 
           connection);

请使用参数化存储过程内联查询是一种糟糕的做法

C#数据库选择

C# database selection

c#

database

listview

listbox