Question

我想从表格＆＃34; EMPLOYE＆＃34;中取出用户的姓名和姓氏。（SQL DB）并将它们保存在组合框中。我想在组合框值中保存每个用户的ID。所以这是我的代码=＆gt;

       public void fill_combobox_users()
    {
        // auto-complete
        comboBox3.AutoCompleteMode = AutoCompleteMode.SuggestAppend;
        comboBox3.AutoCompleteSource = AutoCompleteSource.ListItems;

        da = new SqlDataAdapter("select ID_EMP, concat(NOM_EMP,' ',PRENOM_EMP) as 'nom_prenom' from EMPLOYE", cn);
        DataTable dt = new DataTable();
        try
        {
            cn.Open();
            da.Fill(dt);
            comboBox3.DataSource = dt;
            comboBox3.DisplayMember = "nom_prenom";
            comboBox3.ValueMember = "ID_EMP";
        }

        catch (Exception ex)
        {
            MessageBox.Show(ex.Message);
        }

        finally
        {
            cn.Close();
        }

    }

显示的全名没有问题，但值为no !! 问题是combobox3.ValueMember接受字符串＆＃34; ID_EMP＆＃34;不是表EMPLOYE的价值！

任何解决方案请？

Answer 1

像这样编辑你的SQL查询。应该工作

 public void fill_combobox_users()
        {
            // auto-complete
            comboBox3.AutoCompleteMode = AutoCompleteMode.SuggestAppend;
            comboBox3.AutoCompleteSource = AutoCompleteSource.ListItems;

            da = new SqlDataAdapter("select ID_EMP,(NOM_EMP+ ' ' + PRENOM_EMP) AS NOMM from EMPLOYE", cn);
            DataTable dt = new DataTable();
            try
            {
                cn.Open();
                da.Fill(dt);
                comboBox3.DataSource = dt;
                comboBox3.DisplayMember = "NOMM";
                comboBox3.ValueMember = "ID_EMP";
            }

            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }

            finally
            {
                cn.Close();
            }

        }

Answer 2

要获得值，请尝试

MessageBox.Show(comboBox3.SelectedValue.ToString())

Answer 3

列名是您想要使用的问题列索引请参见此处。

 public void fill_combobox_users()
    {
        // auto-complete
        comboBox3.AutoCompleteMode = AutoCompleteMode.SuggestAppend;
        comboBox3.AutoCompleteSource = AutoCompleteSource.ListItems;

        da = new SqlDataAdapter("select ID_EMP,(NOM_EMP+ ' ' + PRENOM_EMP) AS NOMM from EMPLOYE", cn);
        DataTable dt = new DataTable();
        try
        {
            cn.Open();
            da.Fill(dt);
            comboBox3.DataSource = dt;
            comboBox3.DisplayMember = dt.Columns[1].ColumnName;
            comboBox3.ValueMember = dt.Columns[0].ColumnName;
        }

        catch (Exception ex)
        {
            MessageBox.Show(ex.Message);
        }

        finally
        {
            cn.Close();
        }

    }

将文本和值保存到数据库表中的组合框中

3 个答案: