c# - 错误：DropdownList 返回“System.Data.DataRowView”作为所选项目的文本值

Question

我有一个下拉列表，其中包含所有银行名称。我想在数据网格视图中显示信用额度。但下拉列表返回“System.Data.DataRowView”作为选定项的值。

这是代码：

private void cbxBank_SelectedIndexChanged(object sender, EventArgs e)
{
    int i = cbxBank.SelectedIndex;
    string bank = cbxBank.Text;
    if (i != -1)
    {
        // this Function Returns the Table of CreditLimit According to Bank Name
        DataTable CreditLimit = AM.ReturnAvailableCreditLimit(bank);

        //this function just displays the table in Datat Grid View
        DataGridViewDisplayDetails(CreditLimit);
    }
}

在 DropdownList 中添加数据的代码

        Bank = DbRdRw.SqlDbRead("Select BankName from BankMaster", "BankMaster");
        cbxBank.DataSource = Bank;
        cbxBank.ValueMember = "BankName";
        cbxBank.DisplayMember = "BankName";
        //ends

Answer 1

您需要指定

对于 WinForm，您需要在定义如下属性后指定 DataSource：

Bank = DbRdRw.SqlDbRead("Select BankName from BankMaster", "BankMaster");
cbxBank.ValueMember = "BankName";
cbxBank.DisplayMember = "BankName";
cbxBank.DataSource = Bank; //here

对于 ASP.Net

cbxBank.DataSource = ....;//specify your datasource
cbxBank.DataValueField = "BankID";
cbxBank.DataTextField = "BankName";
cbxBank.DataBind();

Answer 2

您有 2 个选项。

• 覆盖对象的 .ToString() 方法，显示您需要的内容
• 使用下拉列表的 DisplayMemberPath（或等效）属性，显示所需的属性