数据绑定 DropDownList 与来自 Ms access 2013 的 OleDbDataReader

Posted 2023-05-07

【中文标题】数据绑定 DropDownList 与来自 Ms access 2013 的 OleDbDataReader

【英文标题】：data bind DropDownList with OleDbDataReader from Ms access 2013

【发布时间】：2014-12-31 09:59:28

【问题描述】：

我正在尝试将我的下拉列表与我的数据库 MS Access 2013（accdb 文件）数据绑定这是我的代码

 protected void Page_Load(object sender, EventArgs e)
    
        string str = "Provider=Microsoft.ACE.OleDB.12.0; Data Source=C:\\Users\\Dima\\Documents\\Visual Studio 2013\\Projects\\networklab1\\bin\\weblabdb.accdb";
        OleDbConnection db = new OleDbConnection(str);
        db.Open();
        string st = "select areaName from area;";
        OleDbCommand dbc = new OleDbCommand(st, db);
        OleDbDataReader read = dbc.ExecuteReader();

        DropDownList1.DataSource = read;

        DropDownList1.DataBind();
        read.Close();
        db.Close();
    

我得到的是一行“System.Data.Common.DataRecordInternal” 我的错误是什么以及如何解决这个问题！！！ 谢谢你

【参考方案1】：

您缺少检查Postback 以及您缺少DataTextField 和DataValueField

protected void Page_Load(object sender, EventArgs e)
    

if(!Page.IsPostBack)


string str = "Provider=Microsoft.ACE.OleDB.12.0; Data Source=C:\\Users\\Dima\\Documents\\Visual Studio 2013\\Projects\\networklab1\\bin\\weblabdb.accdb";
        OleDbConnection db = new OleDbConnection(str);
        db.Open();
        string st = "select areaName from area;";
        OleDbCommand dbc = new OleDbCommand(st, db);
        OleDbDataReader read = dbc.ExecuteReader();

        DropDownList1.DataSource = read;
        DropDownList1.DataTextField="areaName";       //missing this
        DropDownList1.DataValueField="areaName";        //missing this
        DropDownList1.DataBind();
        read.Close();
        db.Close();



    

【讨论】：

@PanteleevDima 如果您认为这有帮助，请点赞并将其标记为答案

【参考方案2】：

您缺少 DataTextField 和 DataValueField。试试这个-

    protected void Page_Load(object sender, EventArgs e)
    
string str = "Provider=Microsoft.ACE.OleDB.12.0; Data Source=C:\\Users\\Dima\\Documents\\Visual Studio 2013\\Projects\\networklab1\\bin\\weblabdb.accdb";
        OleDbConnection db = new OleDbConnection(str);
        db.Open();
        string st = "select areaName from area;";
        OleDbCommand dbc = new OleDbCommand(st, db);
        OleDbDataReader read = dbc.ExecuteReader();

        DropDownList1.DataSource = read;
        DropDownList1.DataTextField="ShownTextFieldFromDatabaseResults";;       
        DropDownList1.DataValueField="ValueFieldFromDatabaseResults";        
        DropDownList1.DataBind();
        read.Close();
        db.Close();