還有在位置沒有行0

Question

我創建一個網頁，用戶可以在DataGrid編輯信息，但我不斷收到此錯誤：

Exception Details: System.IndexOutOfRangeException: There is no row at position 0.

這是我的代碼：

protected void Page_Load(object sender, EventArgs e) 
{ 
    Label lblProj = this.Master.FindControl("lblProj") as Label; 
    Label lblStr = this.Master.FindControl("lblStruct") as Label; 
    if (Session["projCode"] == null && Session["structCode"] == null) 
    { 
     Response.Redirect("frmSignIn.aspx"); 
    } 
    else 
    { 
     FillGrid(); 
     lblProj.Text = cbal.getField("Project_View", "@PrjM_id_int", Session["projCode"].ToString(), "NameByCode"); 
     string[,] paramVal = new string[2, 2]; 
     paramVal[0, 0] = "@sd_Code_var"; 
     paramVal[0, 1] = Session["structCode"].ToString(); 
     paramVal[1, 0] = "@Sd_ProjectCode_var"; 
     paramVal[1, 1] = Session["projCode"].ToString(); 
     DataSet ds = cbal.fillGrid_with_param("Structure_Definition_GetStrctureName", paramVal); 
     lblStr.Text = ds.Tables[0].Rows[0]["STRUCTURE NAME"].ToString(); 
    } 
    if (!IsPostBack) 
    { 
     FillContQuot(); 
     FillContractor(); 
    } 
    // drpContractorName.SelectedIndexChanged += new EventHandler(drpContractorName_SelectedIndexChanged); 
} 

protected void drpContractorName_SelectedIndexChanged(object sender, EventArgs e) 
{ 
    SqlConnection conn = new SqlConnection(ConfigurationManager.ConnectionStrings["CQRA"].ConnectionString); 
    SqlCommand cmd = new SqlCommand("select * from tbl_Contractor_Master where CNT_Code_var =' " + drpContractorName.SelectedValue.ToString() + " '", conn); 
    conn.Open(); 
    SqlDataReader dr = cmd.ExecuteReader(); 
    int count = 0; 
    Label1.Visible = true; 
    while (dr.Read()) 
    { 
     count++; 
    } 
    if (count > 0) 
    { 
     Label1.Text = "This Contractor Not Available"; 
    } 
    else 
    { 
     Label1.Text = "This Contractor Already Exist"; 
    } 
    //Label1.Visible = false; 
} 

private void FillContractor() 
{ 
    string[,] paramVal2 = new string[1, 2]; 
    paramVal2[0, 0] = "@CNT_Id_int"; 
    paramVal2[0, 1] = "-1"; 
    DataSet ds = cbal.fillGrid_with_param("Contractor_Master_view", paramVal2); 
    Dictionary<string, string> dct = new Dictionary<string, string>(); 
    dct.Add("0", "Select"); 
    { 
     for (int i = 0; i < ds.Tables[0].Rows.Count; i++) 
     { 
      dct.Add(ds.Tables[0].Rows[i]["CONTRACTOR CODE"].ToString(), ds.Tables[0].Rows[i]["CONTRACTOR NAME"].ToString()); 
     } 
    } 
    drpContractorName.DataSource = dct; 
    drpContractorName.DataValueField = "Key"; 
    drpContractorName.DataTextField = "Value"; 
    drpContractorName.DataBind(); 
} 

private void FillContQuot() 
{ 
    string[,] paramVal2 = new string[1, 2]; 
    paramVal2[0, 0] = "@CQ_ID_int"; 
    paramVal2[0, 1] = "-1"; 
    DataSet ds = cbal.fillGrid_with_param("contract_Quotaionapply", paramVal2); 
    Dictionary<string, string> dct = new Dictionary<string, string>(); 
    dct.Add("0", "Select"); 
    for (int i = 0; i < ds.Tables[0].Rows.Count; i++) 
    { 
     dct.Add(ds.Tables[0].Rows[i][0].ToString(), ds.Tables[0].Rows[i][0].ToString()); 
    } 
    drpConQuot.DataSource = dct; 
    drpConQuot.DataValueField = "Key"; 
    drpConQuot.DataTextField = "Value"; 
    drpConQuot.DataBind(); 
}  
protected void DrpConQuotSelectedIndexChanged(object sender, EventArgs e) 
{ 
    lblMsg.Text = ""; 
    if (drpConQuot.SelectedIndex != 0) 
    { 
     FillGrid(); 
     btnsave.Visible = true; 
    } 
    else 
    { 
     grdQuotation.DataSource = null; 
     grdQuotation.DataBind(); 
    } 
} 

protected void DrpContractorNameSelectedIndexChanged(object sender, EventArgs e) 
{ 
    SqlConnection conn = new SqlConnection(ConfigurationManager.ConnectionStrings["dbCQRA@12Sept2012TGConnectionString"].ConnectionString); 
    SqlCommand cmd = new SqlCommand("select * from tbl_Contractor_Master where CNT_Code_var =' " + drpContractorName.SelectedValue.ToString() + " '", conn); 
    conn.Open(); 
    SqlDataReader dr = cmd.ExecuteReader(); 
    int count = 0; 
    Label1.Visible = true; 
    while (dr.Read()) 
    { 
     count++; 
    } 
    if (count > 0) 
    { 
     Label1.Text = "Not Available"; 
    } 
    else 
    { 
     Label1.Text = "Available"; 
    } 
} 

private void FillGrid() 
{ 
    string[,] param = new string[1,2]; 
    Dictionary<string, string> key = new Dictionary<string, string>(); 
    //item.Clear(); 
    key.Add("0", "--Select--"); 
    param[0, 0] = "@Quotation_code_Var"; 
    try 
    { 
     param[0, 1] = drpConQuot.SelectedItem.Value; 
    } 
    catch 
    { 
     param[0, 1] = ""; 
    } 
    dsQuot = cbal.fillGrid_with_param("Quotation_Comparision", param); 
    if (dsQuot.Tables.Count <= 0) 
     return; 
    DataTable tab = new DataTable(); 
    tab.Columns.Add("ITEM NAME"); 
    for (int i = 0; i < dsQuot.Tables.Count; i++) 
    { 
     try 
     { 
      tab.Columns.Add(dsQuot.Tables[i].Rows[0]["Contractor"].ToString().Split('/')[0]); 
     } 
     catch (Exception ex) 
     { 
      lblMsg.Text = ex.Message.ToString(); 
     } 
    } 
    foreach (DataRow r1 in dsQuot.Tables[0].Rows) 
    { 
     DataRow r = tab.NewRow(); 
     //for (int i = 0; i < r1.ItemArray.Length - 1; i++) 
     r[0] = r1[0].ToString(); 
     tab.Rows.Add(r); 
    } 
    for (int i = 0; i < dsQuot.Tables.Count; i++) 
    { 
     int c = 0; 
     foreach (DataRow r1 in dsQuot.Tables[i].Rows) 
     { 
      tab.Rows[c][i+1] = r1[1].ToString(); 
      c++; 
     } 
    } 
    grdQuotation.DataSource = tab;  
    grdQuotation.DataBind(); 
} 

protected void Btnsaveclick(object sender, EventArgs e) 
{ 
    try 
    { 
       string cotationno = drpConQuot.SelectedValue; 
       string quot_AwardedTo = drpContractorName.SelectedValue;//(r.Cells[r.Cells.Count - 2].FindControl("ddlName") as DropDownList).SelectedValue; 
       string[,] para = new string[2, 2]; 
       para[0, 0] = "@quot_no_int"; 
       para[1, 0] = "@quot_AwardedTo"; 
       para[0, 1] = cotationno; 
       para[1, 1] = quot_AwardedTo; 
       cbal.fillGrid_with_param("Contract_AwardedTo", para); 
       lblMsg.Text = "Records Saved!"; 
    } 
    catch(Exception e1) 
    { 
     lblMsg.Text = e1.Message; 
    } 
} 

protected void GridView1RowCreated(object sender, GridViewRowEventArgs e) 
{ 

} 

Answer 1

檢查您的DataSet是否有行。

if(DataSet.Tables[0].rows.Count > 0) 
{ 
// your Code 
} 

Answer 2

當過你使用DataSet你所需要的支票ds.table[0].rows.count > 0比你需要寫你需要的代碼

DataSet ds = cbal.fillGrid_with_param("Contractor_Master_view", paramVal2);