雖然打開頁面出現錯誤，但位置0處沒有行

Question

我想打開反饋窗體，但顯示下面的錯誤
「位置0沒有行。 我已經檢查數據庫中，有一排此查詢「選擇從sap_empmst其中PERNR = zzfname」

這裏是我的代碼...

public partial class feedback : System.Web.UI.Page 
{ 
DataAccess Getdata=new DataAccess(); 
OracleConnection con = new OracleConnection("Data Source=cluster;User ID=ocgpis;Password=pisocg;unicode=true"); 
OracleConnection con1 = new OracleConnection("Data Source=oragc;User ID=ipcltos;Password=ipcltos;unicode=true"); 
//OracleConnection con = new OracleConnection("Data Source=10.127.240.231/ocgpis;User ID=ocgpis;Password=pisocg;unicode=true"); 
//OracleConnection con1 = new OracleConnection("Data Source=10.127.240.216/ipcldb;User ID=ipcltos;Password=ipcltos;unicode=true"); 
OracleConnection con2 = new OracleConnection("Data Source=cluster;User ID=RGSS;Password=RGSS;unicode=true"); 
string strMessage = ""; int mins_now = 0; 
protected void Page_Load(object sender, EventArgs e) 
{ 
    Label1_pl.Text = Session["UserID"].ToString(); 
    string sqlstr = "select zzfname from sap_empmst where pernr = '" + Label1_pl.Text + "'"; 
    DataSet ds = new DataSet(); 
    OracleDataAdapter adp = new OracleDataAdapter(sqlstr, con1); 
    adp.Fill(ds); 
    string zzfname = ds.Tables[0].Rows[0].ItemArray[0].ToString(); 
    Label2_name.Text = zzfname; 
} 

請幫幫忙，謝謝提前

Answer 1

試試這個

錯誤表示您正在訪問的行已不存在的話，

經常檢查行是否存在in DataSet/DataTable using RowCount

protected void Page_Load(object sender, EventArgs e) 
{ 

if(!Page.IsPostBack) 
{ 
    Label1_pl.Text = Session["UserID"].ToString(); 
    string sqlstr = "select zzfname from sap_empmst where pernr = '" + 
    Label1_pl.Text + "'"; 
    DataSet ds = new DataSet(); 
    OracleDataAdapter adp = new OracleDataAdapter(sqlstr, con1); 
    adp.Fill(ds); 

    if(ds!=null) 
    if(ds.Tables[0].Rows.Count>0) 
{ 
    string zzfname = ds.Tables[0].Rows[0]["zzfname"].ToString(); 
    Label2_name.Text = zzfname; 
} 


} 

}