c# - 如何将对象从组合框选择的项目转换为字符串

Question

这一切都在 WINDOWS FORM C#、MICROSOFT VISUAL STUDIO 2008 中

我有一个以这种方式显示的组合框:

private void populateCombos()
    {
        string GetConn1 = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source = c:\\Data\\Db\\Comp.mdb";
        string queryString = "SELECT DISTINCT DC FROM Comp";
        OleDbDataAdapter dA = new OleDbDataAdapter(queryString, GetConn1);
        DataTable dC = new DataTable();
        dA.Fill(dC);
        comboBoxDC.DataSource = dC;
        comboBoxDC.DisplayMember = "DC";

        string GetConn2 = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source = c:\\Data\\Db\\Comp.mdb";
        string queryString2 = "SELECT DISTINCT PL FROM Comp";
        OleDbDataAdapter dA2 = new OleDbDataAdapter(queryString2, GetConn2);
        DataTable pL = new DataTable();
        dA2.Fill(pL);
        comboBoxPL.DataSource = pL;
        comboBoxPL.DisplayMember = "PL";
    }

我在这里遇到的问题是我无法将所选项目变成字符串:

        object da = comboBoxDC.SelectedItem;
        object pr = comboBoxPL.SelectedItem;
        Console.WriteLine(da.ToString());

        Console.WriteLine(da);
        Console.WriteLine(pr);
        //Connection...

        var list = new List<dataQuery>();
        string GetConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source = c:\\Data\\Db\\Comp.mdb";
        string connectionString = GetConnectionString;
        string queryString = "SELECT DC, PL, CompID, User, Email FROM Comp WHERE DC = \'" + da + "\' AND PL = \'" + pr + "\'";

为了让我查询这些命令，我​​需要选择的项目 comboBoxDC 是一个字符串，并且与 comboBoxPL 相同。

回答!!!!!!:

所以我发现了这个:

代码:

string da = comboBoxDC.Text.ToString();

string pr = comboBoxPL.Text.ToString();

Console.WriteLine(da)

Console.WriteLine(pr)

使用 text.tostring 输出成功，实际上是字符串。

Answer 1

MessageBox.Show(comboBoxDC.SelectedItem.ToString());

在我的 WPF 解决方案上运行良好。