Question

我曾尝试在MSDN论坛上发布此问题，但是，我没有成功。

我正在尝试为管理员工的企业制作C＃Windows窗体应用程序。该应用程序使用Access 2010数据库。编辑员工页面是我遇到的麻烦。我希望员工能够从以下格式的组合框中选择：

FirstName LastName，EmployeePosition

数据库名称为EmployeeInformation.accdb 我想从数据库中获得的字段是：

FirstName
名字
EmployeePosition

组合框的名称是cboSelectEmp

我用来尝试获取此数据的当前代码是

 private void LoadDataToCbo()
    {
        string connString = @"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=EmployeeInformation.accdb";
       // string query = @"SELECT FirstName from Employees";
        string query =
            @"SELECT EmpID, LastName + ', ' + FirstName + ' (' + EmployeePosition + ')' as Name FROM Employees";
        OleDbDataAdapter dAdapter = new OleDbDataAdapter(query, connString);
        DataTable source = new DataTable();
        dAdapter.Fill(source);
        cboSelectEmp.DataSource = source;
        //cboSelectEmp.ValueMember = "FirstName";
        //cboSelectEmp.DisplayMember = "FirstName";

        cboSelectEmp.DisplayMember = "Name";
        cboSelectEmp.ValueMember = "EmpID";

    }

Answer 1

您无法在组合框中显示多个列，但尝试使用

之类的查询

select EmpID, LastName + ', ' + FirstName + ' (' + EMployeePosition + ')' as Name from Employees

然后设置你的组合框

cboSelectEmp.DataSource = dt; //dt is the datatable where the result of the query resides
cboSelectEmp.DisplayMember = "Name";
cboSelectEmp.ValueMember = "EmpID";

Answer 2

试试这个

private void LoadDataToCbo()
{
        string connString = @"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=EmployeeInformation.accdb";
       // string query = @"SELECT FirstName from Employees";
        string query =
            @"SELECT EmpID, LastName & ', ' + FirstName & ' (' & EmployeePosition & ')' as Name FROM Employees";
        OleDbDataAdapter dAdapter = new OleDbDataAdapter(query, connString);
        DataTable source = new DataTable();
        dAdapter.Fill(source);
        cboSelectEmp.DataSource = source;
        //cboSelectEmp.ValueMember = "FirstName";
        //cboSelectEmp.DisplayMember = "FirstName";

        cboSelectEmp.DisplayMember = "Name";
        cboSelectEmp.ValueMember = "EmpID";

}

如何从Access数据库中检索某些数据并将其显示在组合框中

2 个答案: