Error when outputing PDF file using HTTP Response when using OnTheFlyPostBack

yudi — Mon, 22 Mar 2010 04:13:37 GMT

I suggest you to do the outputting pdf file in postback event rather than on the flypostback event.

I made a simple test by putting an asp.net postback button – that will trigger the function used to outputting pdf file – inside an asp.net update panel and find that the function no longer works.

Hope this helps.

Error when outputing PDF file using HTTP Response when using OnTheFlyPostBack

dhavalv — Wed, 17 Mar 2010 06:09:46 GMT

The following is the designer code in .aspx file

<%@ Page Language="C#" MasterPageFile="DefaultMaster.master" AutoEventWireup="true" CodeFile="SendingCustomRequest.aspx.cs" Inherits="cs_WebGrid_SendingCustomRequest" Title="Sending Custom Request" %> <%@ Register Assembly="ISNet.WebUI.ISDataSource, Version=1.0.1500.1, Culture=neutral, PublicKeyToken=c4184ef0d326354b" Namespace="ISNet.WebUI.DataSource" TagPrefix="ISDataSource" %> <%@ Register Assembly="ISNet.WebUI.WebGrid" Namespace="ISNet.WebUI.WebGrid" TagPrefix="ISWebGrid" %> <asp:Content ID="Content1" ContentPlaceHolderID="content" runat="server"> <script type="text/javascript"> function WebGrid1_OnRowSelect(gridId, tblName, rowIndex, rowElm)

{

var grid = ISGetObject("WebGrid1"); var key = rowElm.keyValue;

{

grid.AddInput("key",key);

grid.SendCustomRequest();

}

"key",key);

grid.SendCustomRequest();

}

return true;

}

// This function is invoked when the custom request is about to be made. function wgPrepareCustomAction(grid, xmlr, name)

{

grid.SetStatus1("Filtering Orders data..."); return true;

}

// This function is invoked after a response for the custom request is received. function wgCustomActionResponse(grid, xmlrp)

{

grid.SetStatus1("Ready."); return true;

}

</script> <table class="text"> <tr> <td> <ISWebGrid:WebGrid ID="WebGrid1" runat="server" Height="300px" UseDefaultStyle="True" Width="100%" DataMember="Customers" DataSourceID="ISDataSource1" OnInitializePostBack="WebGrid1_InitializePostBack"> <RootTable Caption="Customers" DataKeyField="CustomerID" DataMember="Customers"> <Columns> <ISWebGrid:WebGridColumn Caption="CustomerID" DataMember="CustomerID" Name="CustomerID" Width="100px"> </ISWebGrid:WebGridColumn> <ISWebGrid:WebGridColumn Caption="CompanyName" DataMember="CompanyName" Name="CompanyName" Width="100px"> </ISWebGrid:WebGridColumn> <ISWebGrid:WebGridColumn Caption="ContactName" DataMember="ContactName" Name="ContactName" Width="100px"> </ISWebGrid:WebGridColumn> <ISWebGrid:WebGridColumn Caption="ContactTitle" DataMember="ContactTitle" Name="ContactTitle" Width="100px"> </ISWebGrid:WebGridColumn> <ISWebGrid:WebGridColumn Caption="Address" DataMember="Address" Name="Address" Width="100px"> </ISWebGrid:WebGridColumn> <ISWebGrid:WebGridColumn Caption="City" DataMember="City" Name="City" Width="100px"> </ISWebGrid:WebGridColumn> <ISWebGrid:WebGridColumn Caption="Country" DataMember="Country" Name="Country" Width="100px"> </ISWebGrid:WebGridColumn> </Columns> </RootTable> <LayoutSettings> <ClientSideEvents OnRowSelect="WebGrid1_OnRowSelect" /> </LayoutSettings> <FlyPostBackSettings PostInputControls="True" /> </ISWebGrid:WebGrid> </td> </tr> <tr> <td> KeyValue from WebGrid1 to be reflected in WebGrid2 : <asp:TextBox ID="TextBox1" CssClass="text" runat="server"></asp:TextBox> </td> </tr> <tr> <td> <ISWebGrid:WebGrid ID="WebGrid2" runat="server" Height="300px" UseDefaultStyle="True" Width="100%" DataMember="Orders" DataSourceID="ISDataSource1"> <RootTable Caption="Customers" DataKeyField="OrderID" DataMember="Orders"> <Columns> <ISWebGrid:WebGridColumn Caption="OrderID" DataMember="OrderID" DataType="System.Int32" Name="OrderID" Width="100px"> </ISWebGrid:WebGridColumn> <ISWebGrid:WebGridColumn Caption="CustomerID" DataMember="CustomerID" Name="CustomerID" Width="100px"> </ISWebGrid:WebGridColumn> <ISWebGrid:WebGridColumn Caption="OrderDate" DataMember="OrderDate" DataType="System.DateTime" Name="OrderDate" Width="100px"> </ISWebGrid:WebGridColumn> <ISWebGrid:WebGridColumn Caption="RequiredDate" DataMember="RequiredDate" DataType="System.DateTime" Name="RequiredDate" Width="100px"> </ISWebGrid:WebGridColumn> <ISWebGrid:WebGridColumn Caption="ShippedDate" DataMember="ShippedDate" DataType="System.DateTime" Name="ShippedDate" Width="100px"> </ISWebGrid:WebGridColumn> <ISWebGrid:WebGridColumn Caption="ShipName" DataMember="ShipName" Name="ShipName" Width="100px"> </ISWebGrid:WebGridColumn> <ISWebGrid:WebGridColumn Caption="ShipAddress" DataMember="ShipAddress" Name="ShipAddress" Width="100px"> </ISWebGrid:WebGridColumn> <ISWebGrid:WebGridColumn Caption="ShipCity" DataMember="ShipCity" Name="ShipCity" Width="100px"> </ISWebGrid:WebGridColumn> <ISWebGrid:WebGridColumn Caption="ShipCountry" DataMember="ShipCountry" Name="ShipCountry" Width="100px"> </ISWebGrid:WebGridColumn> </Columns> </RootTable> <FlyPostBackSettings PostInputControls="True" /> </ISWebGrid:WebGrid> </td> </tr> </table> <ISDataSource:ISDataSource ID="ISDataSource1" runat="server" SchemaName="dsNorthwind_LoadOnDemand"> <Tables> <ISDataSource:ISDataSourceTable ConflictDetection="CompareAllValues" DeleteMethod="Delete" InsertMethod="Insert" OldValuesParameterFormatString="Original_{0}" SelectMethod="GetData" TableName="Customers" TypeName="dsNorthwind_LoadOnDemandTableAdapters.CustomersTableAdapter" UpdateMethod="Update"> <UpdateParameters> <asp:Parameter Name="CustomerID" Type="String" /> <asp:Parameter Name="CompanyName" Type="String" /> <asp:Parameter Name="ContactName" Type="String" /> <asp:Parameter Name="ContactTitle" Type="String" /> <asp:Parameter Name="Address" Type="String" /> <asp:Parameter Name="City" Type="String" /> <asp:Parameter Name="Region" Type="String" /> <asp:Parameter Name="PostalCode" Type="String" /> <asp:Parameter Name="Country" Type="String" /> <asp:Parameter Name="Phone" Type="String" /> <asp:Parameter Name="Fax" Type="String" /> <asp:Parameter Name="Original_CustomerID" Type="String" /> <asp:Parameter Name="Original_CompanyName" Type="String" /> <asp:Parameter Name="Original_ContactName" Type="String" /> <asp:Parameter Name="Original_ContactTitle" Type="String" /> <asp:Parameter Name="Original_Address" Type="String" /> <asp:Parameter Name="Original_City" Type="String" /> <asp:Parameter Name="Original_Region" Type="String" /> <asp:Parameter Name="Original_PostalCode" Type="String" /> <asp:Parameter Name="Original_Country" Type="String" /> <asp:Parameter Name="Original_Phone" Type="String" /> <asp:Parameter Name="Original_Fax" Type="String" /> </UpdateParameters> <InsertParameters> <asp:Parameter Name="CustomerID" Type="String" /> <asp:Parameter Name="CompanyName" Type="String" /> <asp:Parameter Name="ContactName" Type="String" /> <asp:Parameter Name="ContactTitle" Type="String" /> <asp:Parameter Name="Address" Type="String" /> <asp:Parameter Name="City" Type="String" /> <asp:Parameter Name="Region" Type="String" /> <asp:Parameter Name="PostalCode" Type="String" /> <asp:Parameter Name="Country" Type="String" /> <asp:Parameter Name="Phone" Type="String" /> <asp:Parameter Name="Fax" Type="String" /> </InsertParameters> <DeleteParameters> <asp:Parameter Name="Original_CustomerID" Type="String" /> <asp:Parameter Name="Original_CompanyName" Type="String" /> <asp:Parameter Name="Original_ContactName" Type="String" /> <asp:Parameter Name="Original_ContactTitle" Type="String" /> <asp:Parameter Name="Original_Address" Type="String" /> <asp:Parameter Name="Original_City" Type="String" /> <asp:Parameter Name="Original_Region" Type="String" /> <asp:Parameter Name="Original_PostalCode" Type="String" /> <asp:Parameter Name="Original_Country" Type="String" /> <asp:Parameter Name="Original_Phone" Type="String" /> <asp:Parameter Name="Original_Fax" Type="String" /> </DeleteParameters> </ISDataSource:ISDataSourceTable> <ISDataSource:ISDataSourceTable ConflictDetection="CompareAllValues" DeleteMethod="Delete" InsertMethod="Insert" OldValuesParameterFormatString="Original_{0}" SelectMethod="GetDataBy" TableName="Orders" TypeName="dsNorthwind_LoadOnDemandTableAdapters.OrdersTableAdapter" UpdateMethod="Update"> <UpdateParameters> <asp:Parameter Name="CustomerID" Type="String" /> <asp:Parameter Name="EmployeeID" Type="Int32" /> <asp:Parameter Name="OrderDate" Type="DateTime" /> <asp:Parameter Name="RequiredDate" Type="DateTime" /> <asp:Parameter Name="ShippedDate" Type="DateTime" /> <asp:Parameter Name="ShipVia" Type="Int32" /> <asp:Parameter Name="Freight" Type="Decimal" /> <asp:Parameter Name="ShipName" Type="String" /> <asp:Parameter Name="ShipAddress" Type="String" /> <asp:Parameter Name="ShipCity" Type="String" /> <asp:Parameter Name="ShipRegion" Type="String" /> <asp:Parameter Name="ShipPostalCode" Type="String" /> <asp:Parameter Name="ShipCountry" Type="String" /> <asp:Parameter Name="Original_OrderID" Type="Int32" /> <asp:Parameter Name="Original_CustomerID" Type="String" /> <asp:Parameter Name="Original_EmployeeID" Type="Int32" /> <asp:Parameter Name="Original_OrderDate" Type="DateTime" /> <asp:Parameter Name="Original_RequiredDate" Type="DateTime" /> <asp:Parameter Name="Original_ShippedDate" Type="DateTime" /> <asp:Parameter Name="Original_ShipVia" Type="Int32" /> <asp:Parameter Name="Original_Freight" Type="Decimal" /> <asp:Parameter Name="Original_ShipName" Type="String" /> <asp:Parameter Name="Original_ShipAddress" Type="String" /> <asp:Parameter Name="Original_ShipCity" Type="String" /> <asp:Parameter Name="Original_ShipRegion" Type="String" /> <asp:Parameter Name="Original_ShipPostalCode" Type="String" /> <asp:Parameter Name="Original_ShipCountry" Type="String" /> </UpdateParameters> <InsertParameters> <asp:Parameter Name="CustomerID" Type="String" /> <asp:Parameter Name="EmployeeID" Type="Int32" /> <asp:Parameter Name="OrderDate" Type="DateTime" /> <asp:Parameter Name="RequiredDate" Type="DateTime" /> <asp:Parameter Name="ShippedDate" Type="DateTime" /> <asp:Parameter Name="ShipVia" Type="Int32" /> <asp:Parameter Name="Freight" Type="Decimal" /> <asp:Parameter Name="ShipName" Type="String" /> <asp:Parameter Name="ShipAddress" Type="String" /> <asp:Parameter Name="ShipCity" Type="String" /> <asp:Parameter Name="ShipRegion" Type="String" /> <asp:Parameter Name="ShipPostalCode" Type="String" /> <asp:Parameter Name="ShipCountry" Type="String" /> </InsertParameters> <DeleteParameters> <asp:Parameter Name="Original_OrderID" Type="Int32" /> <asp:Parameter Name="Original_CustomerID" Type="String" /> <asp:Parameter Name="Original_EmployeeID" Type="Int32" /> <asp:Parameter Name="Original_OrderDate" Type="DateTime" /> <asp:Parameter Name="Original_RequiredDate" Type="DateTime" /> <asp:Parameter Name="Original_ShippedDate" Type="DateTime" /> <asp:Parameter Name="Original_ShipVia" Type="Int32" /> <asp:Parameter Name="Original_Freight" Type="Decimal" /> <asp:Parameter Name="Original_ShipName" Type="String" /> <asp:Parameter Name="Original_ShipAddress" Type="String" /> <asp:Parameter Name="Original_ShipCity" Type="String" /> <asp:Parameter Name="Original_ShipRegion" Type="String" /> <asp:Parameter Name="Original_ShipPostalCode" Type="String" /> <asp:Parameter Name="Original_ShipCountry" Type="String" /> </DeleteParameters> <SelectParameters> <asp:ControlParameter ControlID="TextBox1" Name="CustomerID" PropertyName="Text" Type="String" /> </SelectParameters> </ISDataSource:ISDataSourceTable> </Tables> </ISDataSource:ISDataSource> <asp:Button ID = "test" runat="server" onclick="test_Click" Text="PostBack" />

</asp:Content>

asp:Content>

The following is the code behind

using System; using System.Data; using System.Configuration; using System.Collections; using System.Web; using System.Web.Security; using System.Web.UI; using System.Web.UI.WebControls; using System.Web.UI.WebControls.WebParts; using System.Web.UI.HtmlControls; using System.IO;

public partial class cs_WebGrid_SendingCustomRequest : System.Web.UI.Page

partial class cs_WebGrid_SendingCustomRequest : System.Web.UI.Page

{

protected void Page_Load(object sender, EventArgs e)

{

}

protected void WebGrid1_InitializePostBack(object sender, ISNet.WebUI.WebGrid.PostbackEventArgs e)

{

if (e.Action == ISNet.WebUI.WebGrid.PostBackAction.Custom)

{

TextBox1.Text = Request["key"] as string; // retrieved data specified at client side WebGrid1.ClientAction.RenderControl(TextBox1); // refresh specified control

OutputFile();

}

private void OutputFile()

{

HttpResponse currentResponse = HttpContext.Current.Response;

currentResponse.Clear();

currentResponse.ClearHeaders();

currentResponse.ClearContent();

FileStream fs = new FileStream("C:\\ReportBuilderHelpFile.doc", FileMode.Open); byte[] result = new byte[fs.Length]; int offset = 0; int length = Convert.ToInt32(fs.Length); while (length > 0)

{

int read = fs.Read(result, offset, length);

length = length - read;

offset = offset + read;

}

//Attach pdf file to HttpResponse

currentResponse.AppendHeader("Content-Disposition", "attachment; filename=" + "C:\\ReportBuilderHelpFile.doc");

currentResponse.ContentType = "application/octet-stream; name=ReportBuilderHelpFile.doc";

currentResponse.BinaryWrite(result);

"Content-Disposition", "attachment; filename=" + "C:\\ReportBuilderHelpFile.doc");

currentResponse.ContentType = "application/octet-stream; name=ReportBuilderHelpFile.doc";

currentResponse.BinaryWrite(result);

"application/octet-stream; name=ReportBuilderHelpFile.doc";

currentResponse.BinaryWrite(result);

//currentResponse.End();

currentResponse.Flush();

HttpContext.Current.ApplicationInstance.CompleteRequest();

}

protected void test_Click(object sender, EventArgs e)

{

OutputFile();

}

As you can see, in the code if I click on the full post back button the code works fine, but not in the case of ONTheFlyPostBack

Error when outputing PDF file using HTTP Response when using OnTheFlyPostBack

yudi — Wed, 17 Mar 2010 03:53:44 GMT

Could you please kindly describe me more specific about your scenario, like in which server side event did you put your piece of code; what event that will trigger the code, is it clicking a button, refresh WebGrid, etc; the steps to reproduce the issue; etc?

If you have a running simple sample that replicates the issue, it would be much helpful if you could send the sample to us to be analyzed.

Error when outputing PDF file using HTTP Response when using OnTheFlyPostBack

dhavalv — Tue, 16 Mar 2010 13:22:46 GMT

Hi,

I am using custom "OnTheFlyPostBack" and on custom post back I output a pdf file using "OnTheFlyPostBack" using the following piece of code

HttpResponse currentResponse = HttpContext.Current.Response;currentResponse.Clear();

currentResponse.ClearHeaders(); currentResponse.ClearContent();

HttpResponse currentResponse = HttpContext.Current.Response;currentResponse.Clear();

currentResponse.ClearHeaders(); currentResponse.ClearContent();

currentResponse.AppendHeader("Content-Disposition", "attachment; filename=" + fileName);

currentResponse.ContentType = mimeType;

currentResponse.BinaryWrite(results);

"Content-Disposition", "attachment; filename=" + fileName);

currentResponse.ContentType = mimeType;

currentResponse.BinaryWrite(results);

HttpContext.Current.ApplicationInstance.CompleteRequest();

The webgrid keeps on throwing an error and the code works fine when i do a full post back ? Is there a setting that I need to do in WebGrid to enable this behaviour ?

Intersoft Community - WebGrid Enterprise - Error when outputing PDF file using HTTP Response when using OnTheFlyPostBack

Error when outputing PDF file using HTTP Response when using OnTheFlyPostBack

Error when outputing PDF file using HTTP Response when using OnTheFlyPostBack

Error when outputing PDF file using HTTP Response when using OnTheFlyPostBack

Error when outputing PDF file using HTTP Response when using OnTheFlyPostBack