使用C＃中的组合框加载表单中的“System.Data.DataRowView”

Question

每次我的表单加载/打开时都会提示“System.Data.DataRowView”，我怎么可能删除它呢？

这是我的代码：

    {
        InitializeComponent();
        GetProcessorCardTypes();
    }

    private void GetProcessorCardTypes()
    {
        cn.Open();

        MySqlCommand cmd = new MySqlCommand("call GetProcessorMethod(1)", cn);
        MySqlDataAdapter adapter = new MySqlDataAdapter(cmd);
        DataTable dt = new DataTable();
        adapter.Fill(dt);

        cmbProcessorMethods.DataSource = dt;
        cmbProcessorMethods.ValueMember = "method_id";
        cmbProcessorMethods.DisplayMember = "method_name";
    }

    private void cmbProcessorMethods_SelectedIndexChanged(object sender, EventArgs e)
    {
        MessageBox.Show(cmbProcessorMethods.SelectedValue.ToString());
    }

Answer 1

如果要完全删除消息框，请删除cmbProcessorMethods_SelectedIndexChanged事件处理程序。或者您可以将其更改为显示所选行的method_name：

private void cmbProcessorMethods_SelectedIndexChanged(object sender, EventArgs e)
{
     DataRowView row = (DataRowView)cmbProcessorMethods.SelectedItem;
     MessageBox.Show(row["method_name"].ToString());
}

---

正如Derek指出的那样，只需在分配数据源之前设置DisplayMember和ValueMember属性，原始代码就可以运行：

cmbProcessorMethods.ValueMember = "method_id";
cmbProcessorMethods.DisplayMember = "method_name";
cmbProcessorMethods.DataSource = dt;