Как взять значение BLOB из базы данных и сохранить его в виде строки в пользовательском объекте?

Question

При использовании панели обновления с сеткой я получаю следующую ошибку.

Ошибка времени выполнения Microsoft JScript: Sys.WebForms.PageRequestManagerParserErrorException: не удалось проанализировать сообщение, полученное с сервера. Распространенные причины этой ошибки: изменение ответа путем вызова Response.Write (), фильтров ответа, HttpModules или трассировки сервера.

Я рассмотрел все "исправления" для этого, и, похоже, ни одно из них не работает. Это прекрасно работает при загрузке страницы, но когда я нажимаю на мою асинхронную кнопку, обрабатывается одна строка сетки (я могу посмотреть в отладке javascript), но после обработки первой строки я получаю вышеуказанную ошибку в этой строке.

попробуй { _this._webRequest.completed (Sys.EventArgs.Empty); } в конце концов { if (_this._xmlHttpRequest! = null) { _this._xmlHttpRequest.onreadystatechange = Function.emptyMethod; _this._xmlHttpRequest = null; } }

Вот мой гридвью

 <asp:Button ID="btnSearch" runat="server" Text="Search" OnClick="btnSearch_Click" />
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
    <ContentTemplate>
        <table border="0" cellpadding="2" cellspacing="0" width="100%" id="Table3">
            <tr>
                <td width="100%">
                    <table border="0" cellpadding="0" width="100%" id="Table4">
                        <tr>
                            <td>
                                <span style="font-size: x-large;">Results</span>
                            </td>
                        </tr>
                        <tr>
                            <td style="text-align: left;">
                                <asp:Label ID="lblError" runat="server" ForeColor="Red"></asp:Label>
                                <asp:Label ID="lblCount" runat="server" ForeColor="Black"></asp:Label>
                            </td>
                            <td style="text-align: right;">
                                <asp:Label ID="lblCount2" runat="server" ForeColor="Black"></asp:Label>
                            </td>
                        </tr>
                        <tr>
                            <td colspan="2">
                                <asp:GridView Width="100%" ID="resultsGrid" AutoGenerateColumns="false" runat="server"
                                    AllowPaging="true" AllowSorting="true" PageSize="20" OnPageIndexChanging="gridView_PageIndexChanging"
                                    OnSorting="gridView_Sorting" PagerSettings-Position="TopAndBottom" PagerStyle-HorizontalAlign="Center">
                                    <Columns>
                                        <asp:TemplateField HeaderStyle-Width="2%" ControlStyle-Width="100%">
                                            <ItemTemplate>
                                                <%# Container.DataItemIndex + 1 + "." %>
                                            </ItemTemplate>
                                        </asp:TemplateField>
                                        <asp:TemplateField Visible="false" SortExpression="record_id">
                                            <ItemTemplate>
                                                <asp:Label ID="lblRecordID" runat="server" Text='<%# Eval("RecordID") %>' Visible="false"></asp:Label>
                                            </ItemTemplate>
                                        </asp:TemplateField>
                                        <asp:TemplateField HeaderStyle-Width="7%" ControlStyle-Width="100%" HeaderText="Note Type"
                                            SortExpression="business_content_type_cd">
                                            <ItemTemplate>
                                                <asp:Label ID="lblNoteType" runat="server" Text='<%# Eval("NoteType") %>'></asp:Label>
                                            </ItemTemplate>
                                        </asp:TemplateField>
                                        <asp:TemplateField HeaderStyle-Width="10%" ControlStyle-Width="100%" HeaderText="Author"
                                            SortExpression="author_user_name">
                                            <ItemTemplate>
                                                <asp:Label ID="lblAuthor" runat="server" Text='<%# Eval("Author") %>'></asp:Label>
                                            </ItemTemplate>
                                        </asp:TemplateField>
                                        <asp:TemplateField HeaderStyle-Width="7%" ControlStyle-Width="100%" HeaderText="Date"
                                            SortExpression="content_dttm">
                                            <ItemTemplate>
                                                <asp:Label ID="lblDate" runat="server" Text='<%# Eval("Date") %>'></asp:Label>
                                            </ItemTemplate>
                                        </asp:TemplateField>
                                        <asp:TemplateField HeaderStyle-Width="60%" ControlStyle-Width="100%">
                                            <ItemTemplate>
                                                <asp:Label ID="lblData" runat="server" Text='<%# Eval("NoteContent") %>'></asp:Label>
                                                <asp:HyperLink ID="linkMore" runat="server" />
                                            </ItemTemplate>
                                        </asp:TemplateField>
                                        <asp:TemplateField SortExpression="size" Visible="false">
                                            <ItemTemplate>
                                                <asp:Label ID="lblSize" runat="server" Text='<%# Eval("Size") %>' Visible="false"></asp:Label>
                                            </ItemTemplate>
                                        </asp:TemplateField>
                                    </Columns>
                                </asp:GridView>
                            </td>
                        </tr>
                        <tr>
                            <td style="text-align: left;">
                                <asp:Label ID="lblCount3" runat="server" ForeColor="Black"></asp:Label>
                            </td>
                            <td style="text-align: right;">
                                <asp:Label ID="lblCount4" runat="server" ForeColor="Black"></asp:Label>
                            </td>
                        </tr>
                    </table>
                </td>
            </tr>
        </table>
    </ContentTemplate>
    <Triggers>
        <asp:AsyncPostBackTrigger ControlID="btnSearch" EventName="Click" />
    </Triggers>
</asp:UpdatePanel>

Я совершенно тупик, любая помощь будет великолепна.

Вот мой ответ AJAX от FireBug

14008|updatePanel|ctl00_ContentPlaceHolder_UpdatePanel1|
        <table border="0" cellpadding="2" cellspacing="0" width="100%" id="Table3">
            <tr>
                <td width="100%">
                    <table border="0" cellpadding="0" width="100%" id="Table4">
                        <tr>
                            <td>
                                <span style="font-size: x-large;">Results</span>
                            </td>
                        </tr>
                        <tr>
                            <td style="text-align: left;">
                                <span id="ctl00_ContentPlaceHolder_lblError" style="color:Red;"></span>
                                <span id="ctl00_ContentPlaceHolder_lblCount" style="color:Black;">5 found</span>
                            </td>
                            <td style="text-align: right;">
                                <span id="ctl00_ContentPlaceHolder_lblCount2" style="color:Black;">1 to 5 of 5</span>
                            </td>
                        </tr>
                        <tr>
                            <td colspan="2">
                                <div>
<table cellspacing="0" rules="all" border="1" id="ctl00_ContentPlaceHolder_resultsGrid" style="width:100%;border-collapse:collapse;">
    <tr>
        <th scope="col" style="width:2%;">&nbsp;</th><th scope="col" style="width:7%;"><a href="javascript:__doPostBack('ctl00$ContentPlaceHolder$resultsGrid','Sort$business_content_type_cd')">Note Type</a></th><th scope="col" style="width:10%;"><a href="javascript:__doPostBack('ctl00$ContentPlaceHolder$resultsGrid','Sort$author_user_name')">Author</a></th><th scope="col" style="width:7%;"><a href="javascript:__doPostBack('ctl00$ContentPlaceHolder$resultsGrid','Sort$content_dttm')">Date</a></th><th scope="col" style="width:60%;">&nbsp;</th>
    </tr><tr>
        <td>
                                                1.
                                            </td><td>
                                                <span id="ctl00_ContentPlaceHolder_resultsGrid_ctl03_lblNoteType" style="display:inline-block;width:100%;">General</span>
                                            </td><td>
                                                <span id="ctl00_ContentPlaceHolder_resultsGrid_ctl03_lblAuthor" style="display:inline-block;width:100%;">LISA WHIPKEY</span>
                                            </td><td>
                                                <span id="ctl00_ContentPlaceHolder_resultsGrid_ctl03_lblDate" style="display:inline-block;width:100%;">3/17/2011 4:08:15 PM</span>
                                            </td><td>
                                                <span id="ctl00_ContentPlaceHolder_resultsGrid_ctl03_lblData" style="display:inline-block;width:100%;">HIS ROAD WAS CONTROLLED BY A STOP SIGN. HE NEEDED TO MAKE A LEFT ON TO PINEAND THEN MAKE A LEFT AGAIN QUIKELY INTO A PARKING LOT TO THE LEFT.         HE LOOKED LEFT AND THE INSURED SAW A CAR THAT WAS COMING AT HIM. HE WAS    WAITING FOR THE CAR TO PASS BUT THE CAR THAT WAS COMING AT HIM TURNED INTO THE PARKING LOT THAT HE NEEDED TO TURN INTO. THE INSURED WAS AT THE STOP   SIGN FOR APPROX 20 TO 30 SECONDS. THE LIGHTS WERE GLARINIG ON THE ROAD.��������������</span>
                                                <a id="ctl00_ContentPlaceHolder_resultsGrid_ctl03_linkMore" style="display:inline-block;width:100%;"></a>
                                            </td>
    </tr><tr>
        <td>
                                                2.
                                            </td><td>
                                                <span id="ctl00_ContentPlaceHolder_resultsGrid_ctl04_lblNoteType" style="display:inline-block;width:100%;">General</span>
                                            </td><td>
                                                <span id="ctl00_ContentPlaceHolder_resultsGrid_ctl04_lblAuthor" style="display:inline-block;width:100%;">LISA WHIPKEY</span>
                                            </td><td>
                                                <span id="ctl00_ContentPlaceHolder_resultsGrid_ctl04_lblDate" style="display:inline-block;width:100%;">3/17/2011 4:07:41 PM</span>
                                            </td><td>
                                                <span id="ctl00_ContentPlaceHolder_resultsGrid_ctl04_lblData" style="display:inline-block;width:100%;">CALLED THE INSURED MIKE CHALLEEN AT 406-529-5534 LVM CALLED THE CELL OF    INSD MIIKE CHALLEEN AT 406-529-5534 CONFIRMED R/S FROM THE INSURED.                                                                                   THE INSD DRIVING A FRIENDS VEHICLE.  THE INSD WAS STAYING IN MISSOULA FOR ACOUPLE OF DAYS FOR WORK. HE MET MIKE BROWN FOR DINNER AND INSD MIKE HALLEENJUST PURHCES A NEW 2001 CAMARO SS/SP  VIN - 2G1FT1EW0A9123754, RED IN COLORMIKE BROWN WAS INTERESTED IN PURCHASING ONE AND WANTED TO DRIVE IT FOR THE EVENING. HE AGREED AND SO THE INSURED DROVE MIKE BROWNS VEHICLE WHICH WAS AFORD TRUCK DESIEL 4 DR. TWO TONE PU LONG BED. MIKE BROWN DROVE HIS VEHICLE 2010 CAMARO. SO IN THE MORNING GOING TO WORK AT APPROX 7:30 AM THIS MORNING THE INSURED WORKED OUT AHEAD A SCHEDULE FROM THE HOTEL DECIDED TO GO IN   EARLY.                                                                                                                                                TRAVELING DOWN PATTEE N/B</span>
                                                <a id="ctl00_ContentPlaceHolder_resultsGrid_ctl04_linkMore" href="logNoteDetail.aspx?noteID=0" target="_blank" style="display:inline-block;width:100%;">more</a>
                                            </td>
    </tr><tr>
        <td>
                                                3.
                                            </td><td>
                                                <span id="ctl00_ContentPlaceHolder_resultsGrid_ctl05_lblNoteType" style="display:inline-block;width:100%;">General</span>
                                            </td><td>
                                                <span id="ctl00_ContentPlaceHolder_resultsGrid_ctl05_lblAuthor" style="display:inline-block;width:100%;">LISA WHIPKEY</span>
                                            </td><td>
                                                <span id="ctl00_ContentPlaceHolder_resultsGrid_ctl05_lblDate" style="display:inline-block;width:100%;">3/17/2011 3:58:44 PM</span>
                                            </td><td>
                                                <span id="ctl00_ContentPlaceHolder_resultsGrid_ctl05_lblData" style="display:inline-block;width:100%;">GENERAL NOTE TESTING 123456GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG G  G  G  G GG G G G G G G G G G GGGGGGGG G   G  G G  G   G  G  G  G  G G G  G  G G  G GGG G G FGHJH HFDGKL HFG JDFHGKJDHFG DHFG FH KGHDF GHFKJDHGKH DGHFK   HF    STOPPED THE CK FOR 100,000, SCOTT G. IS NOW DEFENDING THE INSD AND NOT PROTECTING US. I ISSUED OUT THE PAYMENT AND THEN HE HAD THE CK. NOW REVERSED   AND WILL NOT RELEASE THE FUNDS TO P/C AND WAS HOLDING FOR AN EXCHANGE OF   PAYMENT.                                                                                                                                              BOHXXX, SIMPXXX AND TRAXXXL PC                                             283 WEST FRONT STREET, SUITE 201                                           MISSOULA, MONTANA 59802 (MISSOULA CO.)                                     PHN:  406-532-7800                                                         HTTP://WWW.BSTLAWFIRM.COM                                                                           </span>
                                                <a id="ctl00_ContentPlaceHolder_resultsGrid_ctl05_linkMore" href="logNoteDetail.aspx?noteID=0" target="_blank" style="display:inline-block;width:100%;">more</a>
                                            </td>
    </tr><tr>
        <td>
                                                4.
                                            </td><td>
                                                <span id="ctl00_ContentPlaceHolder_resultsGrid_ctl06_lblNoteType" style="display:inline-block;width:100%;">General</span>
                                            </td><td>
                                                <span id="ctl00_ContentPlaceHolder_resultsGrid_ctl06_lblAuthor" style="display:inline-block;width:100%;">LISA WHIPKEY</span>
                                            </td><td>
                                                <span id="ctl00_ContentPlaceHolder_resultsGrid_ctl06_lblDate" style="display:inline-block;width:100%;">3/10/2011 3:55:25 PM</span>
                                            </td><td>
                                                <span id="ctl00_ContentPlaceHolder_resultsGrid_ctl06_lblData" style="display:inline-block;width:100%;">PLAN OF ACTION                                                             IUY                                                                        UYUY KJHKJ                                                                 HKJH                                                                       LKJHKJLH                                                                   JKHKJH                                                                     JKH                                                                        KJHJ                                                                       KH                                                                         JKH                                                                        LJ                                                                         HJK                                                                        HLJ                                                                        HLHJ                     </span>
                                                <a id="ctl00_ContentPlaceHolder_resultsGrid_ctl06_linkMore" href="logNoteDetail.aspx?noteID=0" target="_blank" style="display:inline-block;width:100%;">more</a>
                                            </td>
    </tr><tr>
        <td>
                                                5.
                                            </td><td>
                                                <span id="ctl00_ContentPlaceHolder_resultsGrid_ctl07_lblNoteType" style="display:inline-block;width:100%;">General</span>
                                            </td><td>
                                                <span id="ctl00_ContentPlaceHolder_resultsGrid_ctl07_lblAuthor" style="display:inline-block;width:100%;">LISA WHIPKEY</span>
                                            </td><td>
                                                <span id="ctl00_ContentPlaceHolder_resultsGrid_ctl07_lblDate" style="display:inline-block;width:100%;">3/10/2011 3:53:57 PM</span>
                                            </td><td>
                                                <span id="ctl00_ContentPlaceHolder_resultsGrid_ctl07_lblData" style="display:inline-block;width:100%;">DFSHK                                                                      HKJH                                                                       KJHK HKJ                                                                   OU OI                                                                      UOIU                                                                       U OU O                                                                     UY                                                                         UY                                                                         Y                                                                          Y                                                                          OIJ                                                                        J                                                                          N                                                                          L                        </span>
                                                <a id="ctl00_ContentPlaceHolder_resultsGrid_ctl07_linkMore" href="logNoteDetail.aspx?noteID=0" target="_blank" style="display:inline-block;width:100%;">more</a>
                                            </td>
    </tr>
</table>

5 найдено 1 до 5 из 5

В этом коде я конвертирую значение BLOB из базы данных и сохраняю его в виде строки в пользовательском объекте. Кажется, происходит то, что в конце строки помещаются странные символы. Вот что я делаю, чтобы преобразовать данные

     byteBLOBData = (Byte[])(row[3]);
                        row["data"] = System.Text.Encoding.UTF8.GetString(byteBLOBData);

Answer 1

Один из лучших способов отладки этих проблем - проверить ответ AJAX в Firebug и найти ошибочную разметку, которая не принадлежит.Если вы обновите свой вопрос копией / вставкой этого ответа AJAX, я могу сказать, какой части не должно быть.Затем вы знаете, что искать в коде на стороне сервера.