Lỗi khi chuyển biến phiên sang SQLDataSource

Question

Tôi đang cố gắng chạy Project.aspx. Admin.apsx, khi nút 'VIEW PROFILE' được nhấp, được cho là tạo một phiên "project_id" để hai SQLDataSources nhận được các giá trị project_id từ Session ("project_id").

Tôi nhận được lỗi này:

Project.aspx

<%@ Page Title="" Language="VB" MasterPageFile="~/MasterPage.master" AutoEventWireup="false" CodeFile="Project.aspx.vb" Inherits="Project" %> 


<%@ Register assembly="System.Web.DataVisualization, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" namespace="System.Web.UI.DataVisualization.Charting" tagprefix="asp" %> 



<asp:Content ID="Content3" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server"> 
    <div id="project-image"><asp:Image ID="Image1" runat="server" Height="124px" Width="93px" /> 
     <asp:FormView ID="frmViewProject" runat="server" DataKeyNames="project_id" DataSourceID="SqlDataSource1" HorizontalAlign="Justify"> 
      <EditItemTemplate> 
       project_id: 
       <asp:Label ID="project_idLabel1" runat="server" Text='<%# Eval("project_id") %>' /> 
       <br /> 
       project_type: 
       <asp:TextBox ID="project_typeTextBox" runat="server" Text='<%# Bind("project_type") %>' /> 
       <br /> 
       project_start: 
       <asp:TextBox ID="project_startTextBox" runat="server" Text='<%# Bind("project_start") %>' /> 
       <br /> 
       project_finish: 
       <asp:TextBox ID="project_finishTextBox" runat="server" Text='<%# Bind("project_finish") %>' /> 
       <br /> 
       project_duration: 
       <asp:TextBox ID="project_durationTextBox" runat="server" Text='<%# Bind("project_duration") %>' /> 
       <br /> 
       project_budget: 
       <asp:TextBox ID="project_budgetTextBox" runat="server" Text='<%# Bind("project_budget") %>' /> 
       <br /> 
       project_cost: 
       <asp:TextBox ID="project_costTextBox" runat="server" Text='<%# Bind("project_cost") %>' /> 
       <br /> 
       project_name: 
       <asp:TextBox ID="project_nameTextBox" runat="server" Text='<%# Bind("project_name") %>' /> 
       <br /> 
       <asp:LinkButton ID="UpdateButton" runat="server" CausesValidation="True" CommandName="Update" Text="Update" /> 
       &nbsp;<asp:LinkButton ID="UpdateCancelButton" runat="server" CausesValidation="False" CommandName="Cancel" Text="Cancel" /> 
      </EditItemTemplate> 
      <EditRowStyle BorderStyle="Solid" Font-Bold="False" Font-Names="Verdana" Font-Overline="False" Font-Size="Small" HorizontalAlign="Right" VerticalAlign="Middle" /> 
      <InsertItemTemplate> 
       project_type: 
       <asp:TextBox ID="project_typeTextBox" runat="server" Text='<%# Bind("project_type") %>' /> 
       <br /> 
       project_start: 
       <asp:TextBox ID="project_startTextBox" runat="server" Text='<%# Bind("project_start") %>' /> 
       <br /> 
       project_finish: 
       <asp:TextBox ID="project_finishTextBox" runat="server" Text='<%# Bind("project_finish") %>' /> 
       <br /> 
       project_duration: 
       <asp:TextBox ID="project_durationTextBox" runat="server" Text='<%# Bind("project_duration") %>' /> 
       <br /> 
       project_budget: 
       <asp:TextBox ID="project_budgetTextBox" runat="server" Text='<%# Bind("project_budget") %>' /> 
       <br /> 
       project_cost: 
       <asp:TextBox ID="project_costTextBox" runat="server" Text='<%# Bind("project_cost") %>' /> 
       <br /> 
       project_name: 
       <asp:TextBox ID="project_nameTextBox" runat="server" Text='<%# Bind("project_name") %>' /> 
       <br /> 
       <asp:LinkButton ID="InsertButton" runat="server" CausesValidation="True" CommandName="Insert" Text="Insert" /> 
       &nbsp;<asp:LinkButton ID="InsertCancelButton" runat="server" CausesValidation="False" CommandName="Cancel" Text="Cancel" /> 
      </InsertItemTemplate> 
      <InsertRowStyle HorizontalAlign="Center" VerticalAlign="Middle" /> 
      <ItemTemplate> 
       project_id: 
       <asp:Label ID="project_idLabel" runat="server" Text='<%# Eval("project_id") %>' /> 
       <br /> 
       project_type: 
       <asp:Label ID="project_typeLabel" runat="server" Text='<%# Bind("project_type") %>' /> 
       <br /> 
       project_start: 
       <asp:Label ID="project_startLabel" runat="server" Text='<%# Bind("project_start") %>' /> 
       <br /> 
       project_finish: 
       <asp:Label ID="project_finishLabel" runat="server" Text='<%# Bind("project_finish") %>' /> 
       <br /> 
       project_duration: 
       <asp:Label ID="project_durationLabel" runat="server" Text='<%# Bind("project_duration") %>' /> 
       <br /> 
       project_budget: 
       <asp:Label ID="project_budgetLabel" runat="server" Text='<%# Bind("project_budget") %>' /> 
       <br /> 
       project_cost: 
       <asp:Label ID="project_costLabel" runat="server" Text='<%# Bind("project_cost") %>' /> 
       <br /> 
       project_name: 
       <asp:Label ID="project_nameLabel" runat="server" Text='<%# Bind("project_name") %>' /> 
       <br /> 

      </ItemTemplate> 
      <RowStyle BorderStyle="None" HorizontalAlign="Left" VerticalAlign="Middle" /> 
     </asp:FormView> 
     <asp:Chart ID="chrtComplete" runat="server" DataMember="DefaultView" DataSourceID="SqlDataSource2" EnableViewState="True"> 
      <series> 
       <asp:Series ChartType="Pie" Legend="Completed" Name="Series1" XValueMember="project_start" YValueMembers="project_finish"> 
       </asp:Series> 
      </series> 
      <chartareas> 
       <asp:ChartArea Name="ChartArea1"> 
       </asp:ChartArea> 
      </chartareas> 
      <Legends> 
       <asp:Legend LegendStyle="Row" Name="Completed"> 
       </asp:Legend> 
      </Legends> 
      <Titles> 
       <asp:Title Name="Project Completion"> 
       </asp:Title> 
      </Titles> 
     </asp:Chart> 
     <asp:SqlDataSource ID="SqlDataSource2" runat="server" ConnectionString="<%$ ConnectionStrings:ConnStringDb1 %>" SelectCommand="SELECT [project_start], [project_finish] FROM [projects] WHERE ([project_id] = @project_id)"> 
      <SelectParameters> 
       <asp:SessionParameter Name="project_id" SessionField="project_id" Type="Int32" /> 
      </SelectParameters> 
     </asp:SqlDataSource> 
    </div> 
    <div id="project-info"> 
     <asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:ConnStringDb1 %>" SelectCommand="SELECT [project_id], [project_type], [project_start], [project_finish], [project_duration], [project_budget], [project_cost], [project_name] FROM [projects] WHERE ([project_id] = @project_id)"> 
      <SelectParameters> 
       <asp:SessionParameter Name="project_id" SessionField="project_id" Type="Int32" /> 
      </SelectParameters> 
     </asp:SqlDataSource> 
    </div> 
&nbsp; 
    <br /> 
</asp:Content> 

Admin.aspx

Imports System.Data.SqlClient 

Partial Class Admin 
    Inherits System.Web.UI.Page 

    Protected Sub btnSearchUser_Click(sender As Object, e As EventArgs) Handles btnSearchUser.Click 

     Dim conn As New SqlConnection("Data Source=BRIAN-PC\SQLEXPRESS;Initial Catalog=master_db;Integrated Security=True") 
     Dim searchComm As String = "SELECT username FROM users WHERE CONTAINS (username, @username)" 

     Dim searchSQL As New SqlCommand 

     conn.Open() 

     searchSQL = New SqlCommand(searchComm, conn) 
     searchSQL.Parameters.AddWithValue("@username", txtUserSearch.Text) 

     Dim datareader As SqlDataReader = searchSQL.ExecuteReader() 

     While datareader.Read 

      lstUsers.Items.Add(datareader.Item("username")) 

     End While 



     datareader.Close() 
     conn.Close() 

    End Sub 

    Protected Sub Page_Load(sender As Object, e As EventArgs) Handles Me.Load 

    End Sub 

    Protected Sub DropDownList1_SelectedIndexChanged(sender As Object, e As EventArgs) Handles drpProjects.SelectedIndexChanged 



     Dim conn As New SqlConnection("Data Source=BRIAN-PC\SQLEXPRESS;Initial Catalog=master_db;Integrated Security=True") 
     Dim sqlComm As String = "SELECT project_name FROM projects WHERE project_name=@projectname" 
     Dim sqlProjname As New SqlCommand 

     conn.Open() 

     sqlProjname = New SqlCommand(sqlComm, conn) 
     sqlProjname.Parameters.AddWithValue("@projectname", drpProjects.SelectedItem.Text) 
     Dim datareader As SqlDataReader = sqlProjname.ExecuteReader() 
     datareader.Read() 


     If datareader.HasRows Then 

      lblProjName.Text = datareader("project_name").ToString() 
     End If 

     datareader.Close() 
     conn.Close() 

     lblProjName.Visible = True 
     grdProjDetails.Visible = True 







    End Sub 

    Protected Sub btnManageProj_Click(sender As Object, e As EventArgs) Handles btnManageProj.Click 

     MultiView1.SetActiveView(View2) 


    End Sub 

    Protected Sub btnProjSettings_Click(sender As Object, e As EventArgs) Handles btnProjSettings.Click 

     Dim conn2 As New SqlConnection("Data Source=BRIAN-PC\SQLEXPRESS;Initial Catalog=master_db;Integrated Security=True") 
     Dim sqlComm2 As String = "SELECT project_id FROM projects WHERE project_name=@projectname" 
     Dim sqlProjID As New SqlCommand 

     conn2.Open() 

     sqlProjID = New SqlCommand(sqlComm2, conn2) 
     sqlProjID.Parameters.AddWithValue("@projectname", drpProjects.SelectedItem.Text) 
     Dim datareader As SqlDataReader = sqlProjID.ExecuteReader() 
     datareader.Read() 


     If datareader.HasRows Then 

      Dim UserID As String 
      UserID = datareader("project_id").ToString 

      Session("project_id") = UserID 
      Server.Transfer("Project.aspx", True) 

     End If 

     datareader.Close() 
     conn2.Close() 



    End Sub 
End Class 

MasterPage.aspx

<%@ Master Language="VB" CodeFile="MasterPage.master.vb" Inherits="MasterPage" %> 
<%@ Import Namespace="System.Data.SqlClient" %> 
<!DOCTYPE html> 

<html xmlns="http://www.w3.org/1999/xhtml"> 
<script runat="server"> 



    Protected Sub Page_Load(sender As Object, e As EventArgs) 

     If Session("userid") = Nothing Then 
      txtLoginUser.Visible = True 
      txtLoginPass.Visible = True 

     Else 


      Dim conn As New SqlConnection("Data Source=BRIAN-PC\SQLEXPRESS;Initial Catalog=master_db;Integrated Security=True") 
      Dim useridComm As String = "SELECT name, surname FROM users WHERE user_id=@userid" 
      Dim sqlUserID As New SqlCommand 

      conn.Open() 

      Dim userid As String = Session("userid") 

      sqlUserID = New SqlCommand(useridComm, conn) 
      sqlUserID.Parameters.AddWithValue("@userid", userid) 
      Dim datareader As SqlDataReader = sqlUserID.ExecuteReader() 
      If datareader.HasRows Then 

       FormsAuthentication.RedirectFromLoginPage(datareader("user_id"), True) 
       lblLoggedIn.Text = datareader("name").ToString() & " " & datareader("surname").ToString() 

      End If 
      datareader.Close() 
      conn.Close() 

     End If 
    End Sub 

    Protected Sub Button1_Click(sender As Object, e As EventArgs) 

     Dim loginSQL As New SqlCommand 
     Dim loginComm As String 

     Dim CommonFunctions As New CommonFunctions() 
     Dim dec_pass As String = CommonFunctions.EncryptPassword(txtLoginPass.Text.Trim) 

     Dim conn As New SqlConnection("Data Source=BRIAN-PC\SQLEXPRESS;Initial Catalog=master_db;Integrated Security=True") 


     loginComm = "SELECT user_id FROM users WHERE username=@username and password=@password" 

     conn.Open() 


     loginSQL = New SqlCommand(loginComm, conn) 
     loginSQL.Parameters.AddWithValue("@username", txtLoginUser.Text.ToString) 
     loginSQL.Parameters.AddWithValue("@password", dec_pass) 
     Dim dr As SqlDataReader = loginSQL.ExecuteReader() 
     dr.Read() 


     If dr.HasRows Then 
      Session("userid") = dr("user_id") 
     ElseIf dr.HasRows = False Then 

      lblRegister.ForeColor = Drawing.Color.Red 
      lblRegister.Text = "Incorrect Username/Password." 
     End If 
     dr.Close() 
     conn.Close() 

    End Sub 





</script> 



<head> 
    <meta charset="utf-8" /> 
    <script src="http://html5shiv.googlecode.com/svn/trunk/html5.js"></script> 
    <title></title> 
    <meta name="keywords" content="" /> 
    <meta name="description" content="" /> 
    <link rel="stylesheet" href="style.css" type="text/css" media="screen, projection" /> 
</head> 

<body> 

    <form id="form1" runat="server"> 

<div id="wrapper"> 

    <header id="header"> 
     <strong>Header:</strong> Mobile CMS 

     </header> 


<section id="login"> 

    <div id="login-form"> 

     <p> 

        <asp:Label ID="lblUsername" runat="server" Font-Bold="True" Text="U:"></asp:Label> 
&nbsp;<asp:TextBox ID="txtLoginUser" runat="server" BorderStyle="None" BorderWidth="0px" Wrap="False"></asp:TextBox> 
&nbsp; 
        <asp:Label ID="lblUsername0" runat="server" Font-Bold="True" Text="P:"></asp:Label> 
        <asp:TextBox ID="txtLoginPass" runat="server" BorderStyle="None" BorderWidth="0px" TextMode="Password" Wrap="False"></asp:TextBox> 
&nbsp; 
        <asp:Button ID="btnLogin" runat="server" BorderStyle="None" OnClick="Button1_Click" Text="Login" /> 

       </p> 

       <p> 

        <asp:Label ID="lblRegister" runat="server" Font-Bold="True" Font-Underline="True" ForeColor="#0000CC" Text="Register"></asp:Label> 

        <asp:Label ID="lblLoggedIn" runat="server"></asp:Label> 

       </p> 
     <p> 

        &nbsp;</p> 



    </div> 

</section> 

<div class="navigation-bar"> 
     <ul class="navigation-menu"> 

      <li><a href="#" class="home">Home</a></li> 
      <li><a href="#" class="mainsettings">Settings</a></li> 
      <li><a href="#" class="profile">Profile</a> 

       <ul> 
        <li><a href="#" class="messages">Messages</a></li> 
        <li><a href="#" class="settings">Profile Settings</a></li> 
       </ul> 

      </li> 
      <li><a href="#" class="uploads">Uploads</a></li> 
      <li><a href="#" class="documents">Media</a> 


       <ul> 
        <li><a href="#" class="docs">Documents</a></li> 
        <li><a href="#" class="others">Others</a></li> 
       </ul> 

      </li> 

      <li><a href="#" class="projects">Projects</a> 


       <ul> 
        <li><a href="#" class="yprojects">Your Projects</a></li> 
        <li><a href="#" class="otherprojects">Other Projects</a></li> 
       </ul> 

      </li> 

     </ul> 

    </div> 


    <section id="middle"> 

     <div id="container"> 
      <div id="content"> 
       <div> 
        <asp:ContentPlaceHolder id="ContentPlaceHolder1" runat="server"> 

        </asp:ContentPlaceHolder> 
       </div> 
     </div> 
     </div> 



    </section> 

    <footer id="footer"> 
     <strong>Footer:</strong> adsfdsgfds 
    </footer> 

</div> 

    </form> 

</body> 
</html> 

Ảnh chụp màn hình:

gì đang xảy ra? Có gì sai với mã?

Tôi đang sử dụng VS 2012 Professional với SQL Server 2012 nhanh

Mã cho 'Xem Tiểu Sử' nút là trong Admin.aspx dưới btnProjSettings:

Protected Sub btnProjSettings_Click(sender As Object, e As EventArgs) Handles btnProjSettings.Click 

     Dim conn2 As New SqlConnection("Data Source=BRIAN-PC\SQLEXPRESS;Initial Catalog=master_db;Integrated Security=True") 
     Dim sqlComm2 As String = "SELECT project_id FROM projects WHERE project_name=@projectname" 
     Dim sqlProjID As New SqlCommand 

     conn2.Open() 

     sqlProjID = New SqlCommand(sqlComm2, conn2) 
     sqlProjID.Parameters.AddWithValue("@projectname", drpProjects.SelectedItem.Text) 
     Dim datareader As SqlDataReader = sqlProjID.ExecuteReader() 
     datareader.Read() 


     If datareader.HasRows Then 

      Dim UserID As String 
      UserID = datareader("project_id").ToString 

      Session("project_id") = UserID 
      Server.Transfer("Project.aspx", True) 

     End If 

     datareader.Close() 
     conn2.Close() 



    End Sub 

Answer 1

tôi tin rằng các vấn đề bạn đang gặp có liên quan đến việc cố gắng chuyển hướng đến một trang khác trong khi đăng lại Async.

Trong xử lý sự kiện btnProjSettings_Click của bạn, thay thế:

Server.Transfer("Project.aspx", True) 

với:

Dim jsRedirect As String = "window.location.pathname = 'Project.aspx';" 
ScriptManager.RegisterClientScriptBlock(Page, Page.GetType(), "Redirect to Project.aspx", jsRedirect, true) 

---

Lý do tại sao bạn nhận được lỗi đó là bởi vì trong một Async PostBack, các ASP.NET Các thư viện Ajax đang mong đợi một thông báo tùy chỉnh được trả về, chứ không phải là mã HTML chuẩn. Đổi lại, khi bạn gọi Server.Transfer, máy chủ sẽ trả về mã HTML của trang được chỉ định; do đó lỗi bạn đang thấy.