GridView zeigt keine Daten in einem Panel an

Question

Ich arbeite an einem System, das nach Personen sucht, zeigt dann alle, die die relevanten Suchkriterien darunter in einem GridView passen, aber keine Daten werden angezeigt und es ist wirklich frustrierend. Dies ist das Panel/gridview von PatientSearch.aspx

<asp:UpdatePanel ID="pnlUpdate" runat="server"> 
     <ContentTemplate> 
      <asp:Panel ID="pnlResults" runat="server" ScrollBars="Auto" > 
       <asp:GridView ID="gvSearch" runat="server" Font-Names = "Arial" Font-Size = "11pt" ForeColor = "#000000" 
        onselectedindexchanged="gvSearch_SelectedIndexChanged" AutoGenerateColumns = "false" DataKeyNames="patientid" AllowPaging = "true" 
        OnPageIndexChanging = "OnPaging" PageSize = "10" Width = "100%" HeaderStyle-BackColor = "#465c71" HeaderStyle-ForeColor = "#ffffff"> 

        <Columns> 
         <%--Creates a select button that appear at the start of the grid view--%> 
         <asp:TemplateField> 
          <ItemTemplate> 
           <asp:LinkButton Text="Select" ID="lnkSelect" runat="server" CommandName="Select" /> 
          </ItemTemplate> 
         </asp:TemplateField> 

         <asp:TemplateField HeaderText="HC Number" ItemStyle-Wrap="False"> 
          <ItemTemplate> 
           <%--This will be the first field to appear beside the select button--%> 
           <asp:Label ID="lblHCNum" Text='<%# Eval("HC_Number") %>' runat="server" /> 
          </ItemTemplate> 
         </asp:TemplateField> 
          <%--Bound fields will place them in a specific order--%> 
          <asp:BoundField DataField = "PatientNumber" HeaderText="Patient Number"/> 
          <asp:BoundField DataField = "Surname" HeaderText="Surname"/> 
          <asp:BoundField DataField = "Forename" HeaderText="Forename"/> 
          <asp:BoundField DataField = "ReferredBy" HeaderText="Consultant" ItemStyle-Wrap="False" /> 
          <asp:BoundField DataField = "Sex" HeaderText="Sex"/> 
          <asp:BoundField DataField = "DateOfBirth" HeaderText = "Date Of Birth" DataFormatString="{0:d}" /> 
          <asp:BoundField DataField = "AppointmentDate" HeaderText = "Appointment Date" DataFormatString="{0:d}" /> 

        </Columns> 
       </asp:GridView> 
      </asp:Panel> 
     </ContentTemplate> 
    <Triggers> 
    <asp:AsyncPostBackTrigger ControlID="gvSearch" /> 
    </Triggers> 
    </asp:UpdatePanel> 

Dieser Code aus dem PatientSearch.aspx.cs für das Gridview ist etc

public partial class PatientSearch : System.Web.UI.Page 
{ 
    protected void Page_Load(object sender, EventArgs e) 
    { 
     //As this is the first page the user will have contact with when logged in this is where the limits of what they can and cannot do 
     //Are created to be used on all pages 

     //Open connection to database 
     string constr = ConfigurationManager.ConnectionStrings["OepdSQLConnectionString"].ConnectionString; 
     using (SqlConnection con = new SqlConnection(constr)) 

     { 
      //Select columns required 
      using (SqlCommand cmd = new SqlCommand("SELECT [RoleName], [AddPermission], [EditPermission], [DeletePermission] FROM aspnet_Roles")) 
      { 
       using (SqlDataAdapter sda = new SqlDataAdapter()) 
       { 
        cmd.Connection = con; 
        sda.SelectCommand = cmd; 
        using (DataTable dt = new DataTable()) 
        { 
         //Fill required columns into datatable 
         sda.Fill(dt); 

         //Create stringbuilder to store RoleNames 
         StringBuilder addPermission = new StringBuilder(); 
         StringBuilder editPermission = new StringBuilder(); 
         StringBuilder deletePermission = new StringBuilder(); 

         //Iterate through the datatable and add each correct row to the stringbuilder 
         for (int i = dt.Rows.Count - 1; i >= 0; i--) 
         { 
          DataRow dr = dt.Rows[i]; 

          //only add the necessary rows to the string builder 
          if (dr["AddPermission"].ToString() == "True") 
           addPermission.AppendLine(string.Join(",", dr.ItemArray)); 

          if (dr["EditPermission"].ToString() == "True") 
           editPermission.AppendLine(string.Join(",", dr.ItemArray)); 

          if (dr["DeletePermission"].ToString() == "True") 
           deletePermission.AppendLine(string.Join(",", dr.ItemArray)); 
         } 

         //Remove the unnecessary data from the string 
         addPermission.Replace(",True", ""); addPermission.Replace(",False", ""); 
         editPermission.Replace(",True", ""); editPermission.Replace(",False", ""); 
         deletePermission.Replace(",True", ""); deletePermission.Replace(",False", ""); 

         //Convert stringbuilder to string to allow it to be compared 
         var add = addPermission.ToString(); 
         var edit = editPermission.ToString(); 
         var delete = deletePermission.ToString(); 

         //Retrieve all roles the current user has access to 
         var userRoles = Roles.GetRolesForUser(User.Identity.Name); 

         if (!userRoles.Any(u => add.Contains(u))) 
         { 
          btnNewRecord.Enabled = false; 
         } 

         //Store what permissions are granted to which roles 
         Session["AddPermission"] = add; 
         Session["EditPermission"] = edit; 
         Session["DeletePermission"] = delete; 
        } 
       } 
      } 
     } 

     DataSet ds = (DataSet)Session["DS"]; 

     // if (ds == null) 
     //{ 
      //Make the menu inaccessable if no record has been selected, Due to menu being ambiguous System.Web.UI.WebControls is required 
      //System.Web.UI.WebControls.Menu MyMasterMenu = (System.Web.UI.WebControls.Menu)Master.FindControl("NavigationMenu"); 
      //MyMasterMenu.Visible = false; 
     //} 

     //Hide the export buttons if the gridview is empty 
     if (gvSearch.DataSource == null) 
     { 
      //imgWord.Visible = false; 
      imgExcel.Visible = false; 
      lblExport.Visible = false; 
     } 
     else 
     { 
      //imgWord.Visible = true; 
      imgExcel.Visible = true; 
      lblExport.Visible = true; 
     } 

     //Hide label that catches any errors from user 
     lblErrors.Visible = false; 

     if (Session["RecordSuccessfullyDeleted"] != null) 
     { 
      //Message that has been passed from another page, informs the user that the record has ben successfully deleted 
      string deletedID = Session["RecordSuccessfullyDeleted"].ToString(); 
      lblErrors.Text = deletedID + " Succesfully Deleted!"; 

      //calls the popup to display a notification 
      dvMsg.Visible = true; 
      lblMsg.Text = "" + lblErrors.Text; 

      //To prevent message appearing multiple times 
      Session["RecordSuccessfullyDeleted"] = null; 
     } 
     else 
     { 
      dvMsg.Visible = false; 
     } 
    } 

    //Tells the page what to do once the user has selected a patient 
    protected void gvSearch_SelectedIndexChanged(object sender, EventArgs e) 
    { 

     DataSet ds = new DataSet(); 
     int index = gvSearch.SelectedIndex; 

     string strConString = ConfigurationManager.ConnectionStrings["OepdSQLConnectionString"].ConnectionString; 
     SqlConnection myConnect = new SqlConnection(strConString); 
     myConnect.ConnectionString = strConString; 

     string strCommandText = "prcPersonalSelectedByPatientIdRetrieve"; 

     try 
     { 
      SqlCommand sqlCmd = new SqlCommand(strCommandText, myConnect); 
      sqlCmd.CommandType = CommandType.StoredProcedure; 

      sqlCmd.Parameters.Add(new SqlParameter("@PatientNumber", gvSearch.DataKeys[index].Value.ToString())); 

      SqlDataAdapter da = new SqlDataAdapter(); 
      da.SelectCommand = sqlCmd; 
      da.Fill(ds, "personal"); 

      //Needed to reset the clinical eval page for newly selected patient 
      Session["NDS"] = null; 
     } 

     catch (Exception fe) 
     { 
      lblMoreErrors.Text = "Error: " + fe.Message; 
     } 

     try 
     { 
      //Assigns the selected patients details to the dataset and redirects the user to the personal page 
      Session["DS"] = ds; 
      Response.Redirect("~/UserPages/PatientDetails.aspx"); 
     } 

     catch (Exception er) 
     { 
      lblErrors.Text = "Error: " + er.Message; 
     } 
    } 

    //Tells the gridview what to do when the page change is selected 
    protected void OnPaging(object sender, GridViewPageEventArgs e) 
    { 
     this.DataBindSearch(); 
     gvSearch.PageIndex = e.NewPageIndex; 
     gvSearch.DataBind(); 
    } 

    protected void BtnResetSearch(object sender, EventArgs e) 
    { 
     //Deletes all current criteria enetered and refreshes the page 
     Session["ViewState"] = null; 
     Response.Redirect("~/UserPages/PatientSearch.aspx"); 
    } 

    protected void BtnSearch(object sender, EventArgs e) 
    { 
     //Sets the panel properties after the button is clicked, this helps avoid the empty white 
     //space at the bottom if the property is assigned when nothing is there 
     pnlResults.Style.Add("height", "500px"); 
     this.DataBindSearch(); 
    } 
    protected void BtnAddPatient(object sender, EventArgs e) 
    { 
     Session.Remove("DS"); 
     Response.Redirect("~/UserPages/AddPatient.aspx", false); 
    } 
    protected void DataBindSearch() 
    { 
     DataSet ds = new DataSet(); 

     string strConString = ConfigurationManager.ConnectionStrings["OepdSQLConnectionString"].ConnectionString; 
     SqlConnection myConnect = new SqlConnection(strConString); 
     myConnect.ConnectionString = strConString; 

     string strCommandText = "prcPersonalByPatientIdSelect"; 

     //Now allows partial searches eg. Surname: M will return all surnames with M in it 
     try 
     { 
      SqlCommand sqlCmd = new SqlCommand(strCommandText, myConnect); 
      sqlCmd.CommandType = CommandType.StoredProcedure; 

      if (txtPatientNumber.Text != "") 
      { 
       sqlCmd.Parameters.Add(new SqlParameter("@PatientNumber", txtPatientNumber.Text)); 
      } 

      if (txtHCNumber.Text != "___-___-____") 
      { 
       sqlCmd.Parameters.Add(new SqlParameter("@HC_Number", txtHCNumber.Text)); 
      } 

      if (txtPatientSurname.Text != "") 
      { 
       sqlCmd.Parameters.Add(new SqlParameter("@Surname", txtPatientSurname.Text)); 
      } 

      if (txtPatientFirstName.Text != "") 
      { 
       sqlCmd.Parameters.Add(new SqlParameter("@Forename", txtPatientFirstName.Text)); 
      } 

      if (dpdConsultant.Text != "") 
      { 
       sqlCmd.Parameters.Add(new SqlParameter("@Consultant", dpdConsultant.Text)); 
      } 

      if (dpdSex.Text != "") 
      { 
       sqlCmd.Parameters.Add(new SqlParameter("@Sex", dpdSex.Text)); 
      } 


      //Date of Birth Search 
      if (txtDateOfBirth.Text != "") 
      { 
       //Required for use of between dates 
       string dateDoB = txtDateOfBirth.Text; 
       DateTime date = Convert.ToDateTime(dateDoB); 
       sqlCmd.Parameters.Add(new SqlParameter("@DateOfBirth", date)); 
      } 
      if (txtDateOfBirthTo.Text != "") 
      { 
       if (txtDateOfBirthTo.Text == "*") 
       { 
        //Carries out the funtion of the wildcard 
        DateTime now = DateTime.Now; 
        sqlCmd.Parameters.Add(new SqlParameter("@DateOfBirthEnd", now)); 
       } 
       else 
       { 
        //Required for use of between dates 
        string dateDoB = txtDateOfBirthTo.Text; 
        DateTime date = Convert.ToDateTime(dateDoB); 
        sqlCmd.Parameters.Add(new SqlParameter("@DateOfBirthEnd", date)); 
       } 
      } 

      //Diagnosis Date Search 
      if (txtDiagnosisDate.Text != "") 
      { 
       //Required for use of between dates 
       string dateDD = txtDiagnosisDate.Text; 
       DateTime date = Convert.ToDateTime(dateDD); 
       sqlCmd.Parameters.Add(new SqlParameter("@DiagnosisDate", date)); 
      } 
      if (txtDiagnosisDateTo.Text != "") 
      { 
       if (txtDiagnosisDateTo.Text == "*") 
       { 
        //Carries out the funtion of the wildcard 
        DateTime now = DateTime.Now; 
        sqlCmd.Parameters.Add(new SqlParameter("@DiagnosisDateEnd", now)); 
       } 
       else 
       { 
        //Required for use of between dates 
        string dateDD = txtDiagnosisDateTo.Text; 
        DateTime date = Convert.ToDateTime(dateDD); 
        sqlCmd.Parameters.Add(new SqlParameter("@DiagnosisDateEnd", date)); 
       } 
      } 

      //Examination Date Search 
      if (txtAppointmentDate.Text != "") 
      { 
       //Required for use of between dates 
       string dateED = txtAppointmentDate.Text; 
       DateTime date = Convert.ToDateTime(dateED); 
       sqlCmd.Parameters.Add(new SqlParameter("@AppointmentDate", date)); 
      } 

      if (txtAppointmentDateEnd.Text != "") 
      { 
       if (txtAppointmentDateEnd.Text == "*") 
       { 
        //Carries out the funtion of the wildcard 
        DateTime now = DateTime.Now; 
        sqlCmd.Parameters.Add(new SqlParameter("@AppointmentDateEnd", now)); 
       } 
       else 
       { 
        //Required for use of between dates 
        string dateAD = txtAppointmentDateEnd.Text; 
        DateTime date = Convert.ToDateTime(dateAD); 
        sqlCmd.Parameters.Add(new SqlParameter("@AppointmentDateEnd", date)); 
       } 
      } 


      //Age at Examination Search 
      if (txtAgeAtExamination.Text != "") 
      { 
       //Required for use of between dates 
       string Age = txtAgeAtExamination.Text; 
       DateTime date = Convert.ToDateTime(Age); 
       sqlCmd.Parameters.Add(new SqlParameter("@Age", date)); 
      } 

      if (txtAgeAtExaminationTo.Text != "") 
      { 
       if (txtAgeAtExamination.Text == "*") 
       { 
        //Carries out the funtion of the wildcard 
        DateTime now = DateTime.Now; 
        sqlCmd.Parameters.Add(new SqlParameter("@AgeEnd", now)); 
       } 
       else 
       { 
        //Required for use of between dates 
        string Age = txtAgeAtExamination.Text; 
        DateTime date = Convert.ToDateTime(Age); 
        sqlCmd.Parameters.Add(new SqlParameter("@AgeEnd", date)); 
       } 
      } 

      //EXAMINATION CHECKBOXES 
      //Full-field ERG Checkbox 
      if (chkERG.Checked) 
      { 
       sqlCmd.Parameters.Add(new SqlParameter("@FullField_ERG", chkERG.Checked)); 
      } 

      //Pattern ERG Checkbox 
      if (chkPERG.Checked) 
      { 
       sqlCmd.Parameters.Add(new SqlParameter("@PatternERG", chkPERG.Checked)); 
      } 

      //EOG Checkbox 
      if (chkEOG.Checked) 
      { 
       sqlCmd.Parameters.Add(new SqlParameter("EOG", chkEOG.Checked)); 
      } 

      //Pattern VEP Checkbox 
      if (chkPVEP.Checked) 
      { 
       sqlCmd.Parameters.Add(new SqlParameter("@PatternVEP", chkPVEP.Checked)); 
      } 

      //Flash VEP Checkbox 
      if (chkFVEP.Checked) 
      { 
       sqlCmd.Parameters.Add(new SqlParameter("@FlashVEP", chkFVEP.Checked)); 
      } 

      //Comb VEP/ERG Checkbox 
      if (chkVEPERG.Checked) 
      { 
       sqlCmd.Parameters.Add(new SqlParameter("@CombVEP_ERG", chkVEPERG.Checked)); 
      } 

      //Binoc PVEP Checkbox 
      if (chkBPVEP.Checked) 
      { 
       sqlCmd.Parameters.Add(new SqlParameter("@BinocPVEP", chkBPVEP.Checked)); 
      } 


      //ATTENDANCE 
      if (dpdByAttendance.Text != "") 
      { 
       sqlCmd.Parameters.Add(new SqlParameter("@Attended", dpdByAttendance.Text)); 
      } 

      if (dpdTestedBy.Text != "") 
      { 
       sqlCmd.Parameters.Add(new SqlParameter("@TestedBy", dpdTestedBy.Text)); 
      } 


      // 
      //Awaiting Technical Report 
      if (chkAwaitingTechnicalReport.Checked) 
      { 
       sqlCmd.Parameters.Add(new SqlParameter("@AwaitingTechnicalReport", chkAwaitingTechnicalReport.Checked)); 
      } 

      //Feedback Patients 
      if (chkFeedbackPatients.Checked) 
      { 
       sqlCmd.Parameters.Add(new SqlParameter("@FeedbackPatients ", chkFeedbackPatients.Checked)); 
      } 

      //Interesting Patients 
      if (chkInterestingPatients.Checked) 
      { 
       sqlCmd.Parameters.Add(new SqlParameter("@InterestingPatients", chkInterestingPatients.Checked)); 
      } 

      SqlDataAdapter da = new SqlDataAdapter(); 
      da.SelectCommand = sqlCmd; 
      da.Fill(ds, "personal"); 
      DataTable dt = new DataTable(); 
      da.Fill(dt); 

      //Counts the number of results found 
      lblResults.Text = "Results Found: " + ds.Tables.Cast<DataTable>().Sum(x => x.Rows.Count).ToString(); 
      //Finally, all results matching the criteria will be placed into the gridview 
      gvSearch.DataBind(); 

      //Adds the export button if more than zero results are found 
      if (ds.Tables.Cast<DataTable>().Sum(x => x.Rows.Count) > 0) 
      { 
       //imgWord.Visible = true; 
       imgExcel.Visible = true; 
       lblExport.Visible = true; 
      } 

      Session["CurrentData"] = dt; 
     } 

     catch (Exception fe) 
     { 
      lblErrors.Text = "Error: " + fe.Message; 
     } 
    } 

Jede Hilfe ist sehr wertvoll für mich als mich machen sehr frustriert.

Vielen Dank im Voraus

P. S, ich habe in den ganzen Code bearbeitet und hinzugefügt, um zu sehen, ob noch etwas offensichtlich, dass ich verpasst habe.

Answer 1

Sie müssen die Datenquelle mit dem Gridview zuweisen, haben Sie

gesetzt

gvSearch.DataSource=(DataSet) Session["DS"]; 
gvSearch.Databind();