为什么使用 DevExpress 将数据导出到文件时会抛出 ZlibException？

Question

我有一些带有动态列的 sql 表，当用户单击我的 Report.aspx 页面中的 Get Data 按钮时，我想使用 DevExpress ASPxGridViewExporter 和 ASPxGridView 将它们导出到 xls 或 csv 文件.

• 使用真实数据正确制作表格
• 页面加载成功，真实显示数据

我的问题

当用户点击按钮时，它会下载一个带有以下内容的损坏文件，

我搜索了google、stackoverflow、microsoft support、devexpress support等很多网站，但都没有答案！

任何帮助将不胜感激。

Server Error in '/' Application.        


The stream state of the underlying compression routine is inconsistent.     

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error     and where it originated in the code.       

Exception Details: System.IO.Compression.ZLibException: The stream state of the underlying compression routine is inconsistent.     

Source Error:       

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be     identified using the exception stack trace below.       

Stack Trace:        

[ZLibException: The stream state of the underlying compression routine is inconsistent.]        
   System.IO.Compression.DeflaterZLib.Deflate(FlushCode flushCode) +196     
   System.IO.Compression.DeflaterZLib.ReadDeflateOutput(Byte[] outputBuffer, FlushCode flushCode, Int32& bytesRead) +185        
   System.IO.Compression.DeflaterZLib.System.IO.Compression.IDeflater.GetDeflateOutput(Byte[] outputBuffer) +44     
   System.IO.Compression.DeflateStream.WriteDeflaterOutput(Boolean isAsync) +58     
   System.IO.Compression.DeflateStream.Write(Byte[] array, Int32 offset, Int32 count) +76       
   System.Web.HttpWriter.FilterIntegrated(Boolean finalFiltering, IIS7WorkerRequest wr) +578        
   System.Web.HttpResponse.UpdateNativeResponse(Boolean sendHeaders) +1272      
   System.Web.HttpResponse.Flush(Boolean finalFlush, Boolean async) +191        
   System.Web.HttpWriter.WriteFromStream(Byte[] data, Int32 offset, Int32 size) +88     
   System.IO.Compression.DeflateStream.PurgeBuffers(Boolean disposing) +142     
   System.IO.Compression.DeflateStream.Dispose(Boolean disposing) +40       
   System.IO.Stream.Close() +26     
   System.IO.Compression.GZipStream.Dispose(Boolean disposing) +42      
   System.IO.Stream.Close() +26     
   System.Web.HttpWriter.FilterIntegrated(Boolean finalFiltering, IIS7WorkerRequest wr) +767        
   System.Web.HttpResponse.FilterOutput() +127      
   System.Web.CallFilterExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +62       
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +98     

Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.6.1055.0         

我的问题

• 为什么是ZLibExceptionthorws？

这是我的代码：

平均售价

<%@ Register Assembly="DevExpress.Web.v16.1" Namespace="DevExpress.Web"
    TagPrefix="dx" %>
<%@ Register Assembly="DevExpress.XtraPrinting.v16.1" Namespace="DevExpress.Web"
    TagPrefix="dx" %>

<%@ Register  Assembly="DevExpress.Printing.v16.1.Core, Version=16.1.4.0, Culture=neutral, PublicKeyToken=b88d1754d700e49a" Namespace="DevExpress.Printing"
    TagPrefix="dx" %>

<asp:Content ID="Content2" ContentPlaceHolderID="C" runat="Server">
    <div id="divMain" class="main" style="padding: 10px">
        <asp:ObjectDataSource ID="ods" runat="server" TypeName="MySite.Control.CustomTable" SelectMethod="ReadTable">
            <SelectParameters>
                <asp:Parameter Type="Int64" Name="ID" />
            </SelectParameters>
        </asp:ObjectDataSource>

        <dx:ASPxGridView ID="grid" runat="server" ClientInstanceName="grid" AutoGenerateColumns="false"
            KeyFieldName="ID" Width="100%">
            <Columns>
                <!-- Columns Will Be Generated Dynamically -->
            </Columns>
            <SettingsCustomizationWindow Enabled="True" />
            <SettingsBehavior ColumnResizeMode="Control" AllowDragDrop="true" AllowFocusedRow="true" />
            <Settings ShowGroupPanel="True" ShowColumnHeaders="true" ShowFilterBar="Visible"
                ShowFooter="true" ShowGroupFooter="VisibleIfExpanded" ShowGroupButtons="true"
                ShowFilterRow="true" ShowFilterRowMenu="true" />
            <SettingsLoadingPanel Mode="ShowOnStatusBar" />
            <GroupSummary>
            </GroupSummary>
        </dx:ASPxGridView>

        <!-- ASPxGridViewExporter -->
        <dx:ASPxGridViewExporter ID="exporter" runat="server" GridViewID="grid">
        </dx:ASPxGridViewExporter>


        <div style="direction: rtl">
            <asp:DropDownList ID="exportType" runat="server">
                <asp:ListItem Text="XLS" Value="XLS" />
                <asp:ListItem Text="CSV" Value="CSV" />
            </asp:DropDownList>

            <asp:Button ID="btnExport" runat="server" Text="Get Data" OnClick="BtnExportClick" />
        </div>

    </div>


</asp:Content>

C#

protected void BtnExportClick(object sender, EventArgs e)
{
    grid.SettingsDetail.ExportMode = GridViewDetailExportMode.All;
    switch (exportType.SelectedValue)
    {
        case "XLS":
            exporter.WriteXlsToResponse();
            break;
        case "CSV":
            exporter.WriteCsvToResponse();
            break;
        default:
            return;
    }
}

Answer 1

我不知道您是否能够解决此问题，但在我的情况下，这是由于 Telerik Compression (Rad Compression) 试图使输出流放气。一旦我在我的班级声明问题中摆脱它就消失了。

另一个建议是将网格控件移到更新面板之外。如果控件位于更新面板内，则 WriteToResponse 方法不起作用。