blocks|key|945606|text|文件路径应该是物理路径，而不是虚拟路径。使用|type|unstyled|depth|inlineStyleRanges|entityRanges|data|945607|if+(File.Exists(Server.MapPath(wordDocName)))|code-block|syntax|javascript|945608|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

the file path should be physical not virtual. Use

<pre><code>if (File.Exists(Server.MapPath(wordDocName)))
</code></pre>

blocks|key|4637203|text|File.Exists()以及您想要对该文件执行的所有其他操作都需要一个真实的路径。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4637204|您的wordDocName是相对URL。|4637205|只需使用|4637206|string+fileName+=+Server.MapPath(wordDocName);|code-block|syntax|javascript|4637207|entityMap^0|0|D|0|2|B|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|T|8|@$9|U|A|V|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|W|8|@]|D|@]|E|$]]|$1|J|3|K|5|L|7|X|8|@]|D|@]|E|$M|N]]|$1|O|3|-4|5|6|7|Y|8|@]|D|@]|E|$]]]|P|$]]

<code>File.Exists()</code> and probably everything else you want to do with the file will need a real Path. 

Your <code>wordDocName</code> is a relative URL.

Simply use

<pre><code>string fileName = Server.MapPath(wordDocName);
</code></pre>

blocks|key|4637150|text|使用|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4637151|Server.MapPath("~/specifications/"+%2B+Convert.ToInt32(ViewState["projectSelected"])+%2B+".doc")|code-block|syntax|javascript|4637152|以获取完全限定的路径。这对你来说应该很有用。|4637153|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

Use 

<pre><code>Server.MapPath("~/specifications/" + Convert.ToInt32(ViewState["projectSelected"]) + ".doc")
</code></pre>

to get the fully-qualified path. That should do the trick for ya.

blocks|key|945685|text|你需要使用Server.MapPath。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|945686|++++wordDocName+=+Server.MapPath("~/specifications/"+%2B+Convert.ToInt32(ViewState["projectSelected"])+%2B+".doc");
++++ViewState["wordDocName"]+=+wordDocName;
++++if+(File.Exists(wordDocName))
++++{
++++++++btnDownloadWordDoc.Visible+=+true;
++++}
++++else
++++{
++++++++btnDownloadWordDoc.Visible+=+false;
++++}|code-block|syntax|javascript|945687|entityMap^0|5|E|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

You need to use <code>Server.MapPath</code> e.g.

<pre><code> wordDocName = Server.MapPath("~/specifications/" + Convert.ToInt32(ViewState["projectSelected"]) + ".doc");
 ViewState["wordDocName"] = wordDocName;
 if (File.Exists(wordDocName))
 {
 btnDownloadWordDoc.Visible = true;
 }
 else
 {
 btnDownloadWordDoc.Visible = false;
 }
</code></pre>

blocks|key|4637317|text|如果包含文件的目录由连接/符号链接引用，则这可能不起作用。我在自己的应用程序中遇到了这种情况，如果我将文件的实际路径放入其中，File.Exists()将返回true。但是如果我使用Server.MapPath，但是文件夹实际上是文件夹的连接点，它似乎失败了。有没有人经历过同样的行为？|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4637318|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

this might not work if the directory holding the file is referenced by a junction/symbolic link. I have this case in my own application and if I put the REAL path to the file, File.Exists() returns true. But if I use Server.MapPath but the folder is in fact a junction to the folder, it seems to fail. Anyone experienced the same behaviour?

blocks|key|2563173|text|您必须使用Server.MapPath(relativePath)将路径转换为物理路径|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2563174|if+(File.Exists(filePath))

wordDocName+=+"~/specifications/"+%2B+ViewState["projectSelected"]+%2B+".doc";++++++++
btnDownloadWordDoc.Visible+=+File.Exists(Server.MapPath(wordDocName));|code-block|syntax|javascript|2563175|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

You have to convert the path to a physical path with Server.MapPath(relativePath)

<pre><code>if (File.Exists(filePath))

wordDocName = "~/specifications/" + ViewState["projectSelected"] + ".doc"; 
btnDownloadWordDoc.Visible = File.Exists(Server.MapPath(wordDocName));
</code></pre>

blocks|key|2563263|text|字符"~“是ASP.NET中的一个特殊字符，用于获取虚拟路径规范，意思是”应用程序的根目录“。Is不像File应用编程接口那样被.NET+BCL理解，并且必须首先映射到具有Server.MapPath()的物理路径，如其他人所述。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|BOLD|entityRanges|data|2563264|entityMap^0|3|1|1F|4|2E|G|Q|2|2V|2|0^^$0|@$1|2|3|4|5|6|7|I|8|@$9|J|A|K|B|C]|$9|L|A|M|B|C]|$9|N|A|O|B|C]|$9|P|A|Q|B|D]|$9|R|A|S|B|D]]|E|@]|F|$]]|$1|G|3|-4|5|6|7|T|8|@]|E|@]|F|$]]]|H|$]]

The character "<code>~</code>" is a special char in ASP.NET to get virtual path specifications and simply means "root directory of the application". Is is not understood by the .NET BCL like the <code>File</code> API and must be mapped first into a physical path with <code>Server.MapPath()</code> as others stated.

blocks|key|4637280|text|string+docname="traintatkalantnoy.txt";|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4637281|string+a+=+(Server.MapPath(docname));+++++++++++++if+(File.Exists(a))|4637282|entityMap^0|0|13|0|0|1X|0^^$0|@$1|2|3|4|5|6|7|J|8|@$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|H|3|-4|5|6|7|P|8|@]|D|@]|E|$]]]|I|$]]

<code>string docname="traintatkalantnoy.txt";</code>

<code>string a = (Server.MapPath(docname));
 if (File.Exists(a))</code>

I am trying to check if a file is on the server with the C# code behind of my ASP.NET web page. I know the file does exist as I put it on the server in a piece of code before hand. Can anyone see why it is not finding the file. This is the code:

<pre><code>wordDocName = "~/specifications/" + Convert.ToInt32(ViewState["projectSelected"]) + ".doc";
ViewState["wordDocName"] = wordDocName;
if (File.Exists(wordDocName))
{
 btnDownloadWordDoc.Visible = true;
}
else
{
 btnDownloadWordDoc.Visible = false;
}
</code></pre>

Check if a file exists on the server

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

文章

问答

视频

学习中心

腾讯云实验室

直播

竞赛

腾讯云代码分析专区

腾讯iOA零信任安全管理系统专区

腾讯云架构师技术同盟交流圈

腾讯云数据库专区

腾讯云顾问专区

腾讯云原生专区

腾讯混元专区

腾讯云TCE专区

腾讯云Lighthouse专区

腾讯云HAI专区

腾讯云Edgeone专区

腾讯云存储专区

腾讯云智能专区

腾讯轻联专区 

腾讯云开发专区

TAPD专区

腾讯轻量云游戏服专区

腾讯云最具价值专家

腾讯云架构师技术同盟

腾讯云创作之星

腾讯云开发者先锋

腾讯云代码助手

云原生构建

TAPD 敏捷项目管理

Cloud Studio

SDK中心

API中心

命令行工具

涵盖代码开发、场景应用、自动测试全流程，助你从零构建专属AI助手

一站式MCP教程库，解锁AI应用新玩法

我正在尝试检查服务器上是否存在包含ASP.NET网页后面的C#代码的文件。我知道这个文件确实存在，因为我事先把它放在服务器上的一段代码中。有没有人知道为什么它找不到文件。代码如下：wordDocName = "~/specifications/" + Convert.ToInt32(ViewState["projectSelected"]) + ".doc";ViewState["wordDocN

问检查服务器上是否存在文件
EN

回答 8

Stack Overflow用户

Stack Overflow用户

Stack Overflow用户

社区

活动

圈层

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问检查服务器上是否存在文件EN

回答 8

Stack Overflow用户

Stack Overflow用户

Stack Overflow用户

社区

活动

圈层

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问检查服务器上是否存在文件
EN