将 XML 文件写入用户浏览器并下载答案

【问题标题】：Writing XML file to Users Browser and download将 XML 文件写入用户浏览器并下载
【发布时间】：2017-01-13 02:29:59
【问题描述】：

我正在将 XML 数据写入用户浏览器以供下载。下面是代码

受保护的无效 WriteXmlToPageDownload(XElement XmlCustomerData) {

        try
        {
            if (XmlCustomerData != null)
            {

                XDocument x = new XDocument(new XDeclaration("1.0", "UTF-8", "yes"), new XElement(XmlCustomerData));
                StringBuilder builder = new StringBuilder();
                StringWriter writer = new StringWriter(builder);

                x.Save(writer);
                writer.Flush();
                HttpContext context = HttpContext.Current;
                context.Response.Write(builder.ToString().Replace("encoding=\"utf-16\"", "encoding=\"utf-8\""));
                context.Response.ContentType = "application/xml";
                string filename = "CustomerDetails ";
                context.Response.AppendHeader("Content-Disposition", "attachment; filename=" + filename + ".xml");
                context.Response.AppendHeader("Connection", "close");
                context.Response.End();

            }

        }
        catch (Exception ex)
        {
            Log("Exception in CustomerData" + ex.Message.ToString(), this);
        }
    }

XmlCustomerData 包含由 XElement 创建的 XML（一些业务逻辑...）以下是所需的 XML 示例

<?xml version="1.0" encoding="utf-8" standalone="yes"?>
<Customers>
  <Customer>

 <deatils name="ABC">
    <id="1">
     </details>
 <deatils name="XYZ">
    <id="2">
 </details>
   ...
</Customer>
</Customers>

并且 XmlCustomerData 包含保持完整的业务逻辑

<Customers>...</Customers>

问题是。 1.XML被创建，也没有被下载到用户浏览器 2.我得到了例外 “无法计算表达式，因为代码已优化或本机框架位于调用堆栈顶部。”

我的要求是将 XML 文件下载到用户的浏览器。请让我知道我在做什么错误或更好的方法

提前致谢。

【问题讨论】：

标签： c# xml download httpcontext xelement

【解决方案1】：

一旦您将 xml 数据加载到 XDocument 然后代码

StringBuilder builder = new StringBuilder();
StringWriter writer = new StringWriter(builder);

可以替换为

x.Save(context.Response.OutputStream);

类似代码的快速模型，下面的代码会在要求用户保存或打开附件后下载xml内容。该代码包含在 Http Handler ashx 文件中。

/// <summary>
/// Summary description for Handler1
/// </summary>
public class Handler1 : IHttpHandler
{

    public void ProcessRequest(HttpContext context)
    {
        string xml =
            @"<?xml version=""1.0""?>
            <Customers>
                <Customer>
                    <details>
                        <id/>
                    </details>
                    <details>
                        <id/>
                    </details>
                </Customer>
            </Customers>";

        XElement xel = XElement.Parse(xml);
        XDocument x = new XDocument(new XDeclaration("1.0", "UTF-8", "yes"), new XElement(xel));

        context.Response.ContentType = "application/xml";
        context.Response.AppendHeader("Content-Disposition", "attachment; filename=Test.xml");
        context.Response.AddHeader("Content-Length", xml.Length.ToString());
        x.Save(context.Response.OutputStream);
    }

    public bool IsReusable
    {
        get
        {
            return false;
        }
    }
}

此代码直接在网页上显示 xml。该代码包含在 Http Handler ashx 文件中。

/// <summary>
/// Summary description for Handler2
/// </summary>
public class Handler2 : IHttpHandler
{

    public void ProcessRequest(HttpContext context)
    {
        string xml =
            @"<?xml version=""1.0""?>
            <Customers>
                <Customer>
                    <details>
                        <id/>
                    </details>
                    <details>
                        <id/>
                    </details>
                </Customer>
            </Customers>";

        XElement xel = XElement.Parse(xml);
        XDocument x = new XDocument(new XDeclaration("1.0", "UTF-8", "yes"), new XElement(xel));

        context.Response.ContentType = "application/xml";
        context.Response.AddHeader("Content-Length", xml.Length.ToString());
        x.Save(context.Response.OutputStream);
    }

    public bool IsReusable
    {
        get
        {
            return false;
        }
    }
}

【讨论】：