...是物理路径，但预计会有虚拟路径。 [英] ...is a physical path, but a virtual path was expected.

问题描述

您好我收到此错误：

Hi I am getting this error:

Read_Insert_Data_Into_XML_File/App_Data/Sample.xml'' is a physical path, but a virtual path was expected.

这是我的代码：

This is my code:

protected void btnSubmit_Click(object sender, EventArgs e)
   {
       XmlDocument xmlDoc = new XmlDocument();
       string xmlPath = Path.Combine(Server.MapPath("~/App_Data"), "Sample.xml");
       if (!File.Exists(xmlPath))
       {
           throw new Exception("Cannot find xml file");
       }
       else
       {
           xmlDoc.Load(Server.MapPath(xmlPath));
           XmlElement parentElement = xmlDoc.CreateElement("Comments");
           XmlElement name = xmlDoc.CreateElement("Name");
           name.InnerText = txtName.Text;
           parentElement.AppendChild(name);
           parentElement.AppendChild(Location);
           xmlDoc.DocumentElement.AppendChild(parentElement);
           xmlDoc.Save(Server.MapPath(xmlPath));
           BindDataList();
    }

我在这行代码中收到错误：

xmlDoc.Load（Server.MapPath （xmlPath））;

I am getting an error at this line of code:
xmlDoc.Load(Server.MapPath(xmlPath));

推荐答案

您已经将虚拟路径转换为物理路径，因此第二次尝试转换失败，因为它已经是物理路径：

You already converted the virtual path to a physical path, so the second time you try the conversion fails as it already is a physical path:

protected void btnSubmit_Click(object sender, EventArgs e)
    {
        XmlDocument xmlDoc = new XmlDocument();
        string xmlPath = Path.Combine(Server.MapPath("~/App_Data"), "Sample.xml"); // The conversion is done here, by Server.MapPath
        if (!File.Exists(xmlPath))
        {
            throw new Exception("Cannot find xml file");
        }
        else
        {
            //xmlDoc.Load(Server.MapPath(xmlPath));   // Error happens here too
            xmlDoc.Load(xmlPath);                     // Same as below 
            XmlElement parentElement = xmlDoc.CreateElement("Comments");
            XmlElement name = xmlDoc.CreateElement("Name");
            name.InnerText = txtName.Text;
            parentElement.AppendChild(name);
            parentElement.AppendChild(Location);
            xmlDoc.DocumentElement.AppendChild(parentElement);
            //xmlDoc.Save(Server.MapPath(xmlPath)); // Error happens here as the path was already a physical path
            xmlDoc.Save(xmlPath);                   // Just leave out the Server.MapPath call
            BindDataList();
     }

问候，

- Manfred

浏览这些链接。它肯定会帮助你。



Server.MapPath - 给定物理路径，预期虚拟路径



从物理路径转换为虚拟路径



将物理路径转换为虚拟路径&反之亦然

Go through these links.It wil definately help you.

Server.MapPath - Physical path given, virtual path expected

Convert from physical path to virtual path

Converting a physical path to Virtual path & vice versa

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