blocks|key|1018991|text|如果需要，可以使用File.Exists检查该文件是否存在，并使用File.Create创建该文件。确保检查您是否有权在该位置创建文件。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1018992|一旦确定文件存在，就可以安全地对其进行写入。尽管作为预防措施，您应该将您的代码放入try...catch块中，并捕捉如果事情没有完全按照计划进行，函数可能引发的异常。|1018993|Additional+information+for+basic+file+I/O+concepts。|1018994|entityMap|0|LINK|mutability|MUTABLE|url|http://msdn.microsoft.com/en-us/library/system.io.file.exists(v=VS.100).aspx|1|http://msdn.microsoft.com/en-us/library/d62kzs03(v=VS.100).aspx|2|http://msdn.microsoft.com/en-us/library/336wast5(v=VS.100).aspx)^0|9|B|0|X|B|1|0|0|0|1E|2|0^^$0|@$1|2|3|4|5|6|7|T|8|@]|9|@$A|U|B|V|1|W]|$A|X|B|Y|1|Z]]|C|$]]|$1|D|3|E|5|6|7|10|8|@]|9|@]|C|$]]|$1|F|3|G|5|6|7|11|8|@]|9|@$A|12|B|13|1|14]]|C|$]]|$1|H|3|-4|5|6|7|15|8|@]|9|@]|C|$]]]|I|$J|$5|K|L|M|C|$N|O]]|P|$5|K|L|M|C|$N|Q]]|R|$5|K|L|M|C|$N|S]]]]

You can use <a href="http://msdn.microsoft.com/en-us/library/system.io.file.exists(v=VS.100).aspx" rel="nofollow noreferrer">File.Exists</a> to check if the file exists and create it using <a href="http://msdn.microsoft.com/en-us/library/d62kzs03(v=VS.100).aspx" rel="nofollow noreferrer">File.Create</a> if required. Make sure you check if you have access to create files at that location.

Once you are certain that the file exists, you can write to it safely. Though as a precaution, you should put your code into a try...catch block and catch for the exceptions that function is likely to raise if things don't go exactly as planned.

<a href="http://msdn.microsoft.com/en-us/library/336wast5(v=VS.100).aspx" rel="nofollow noreferrer">Additional information for basic file I/O concepts</a>.

blocks|key|1019031|text|要创建|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1019032|在写入文件之前执行(new+FileInfo(filePath)).Directory.Create()。|offset|length|style|CODE|1019033|....Or，如果存在，则创建(否则不执行任何操作)|1019034|System.IO.FileInfo+file+=+new+System.IO.FileInfo(filePath);
file.Directory.Create();+//+If+the+directory+already+exists,+this+method+does+nothing.
System.IO.File.WriteAllText(file.FullName,+content);|code-block|syntax|javascript|1019035|entityMap^0|0|9|17|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|R|8|@$D|S|E|T|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|U|8|@]|9|@]|A|$]]|$1|J|3|K|5|L|7|V|8|@]|9|@]|A|$M|N]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

<h3>To Create</h3>
<code>(new FileInfo(filePath)).Directory.Create()</code> before writing to the file.
<h3>....Or, if it exists, then create (else do nothing)</h3>
<pre><code>System.IO.FileInfo file = new System.IO.FileInfo(filePath);
file.Directory.Create(); // If the directory already exists, this method does nothing.
System.IO.File.WriteAllText(file.FullName, content);
</code></pre>

blocks|key|1019047|text|您可以使用以下代码|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1019048|++DirectoryInfo+di+=+Directory.CreateDirectory(path);|code-block|syntax|javascript|1019049|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 can use following code

<pre><code> DirectoryInfo di = Directory.CreateDirectory(path);
</code></pre>

blocks|key|1019097|text|正如@hitec所说，您必须确保您拥有正确的权限，如果您拥有正确的权限，您可以使用以下行来确保该目录的存在：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1019098|Directory.CreateDirectory(Path.GetDirectoryName(filePath))|offset|length|style|CODE|1019099|entityMap^0|0|0|1M|0^^$0|@$1|2|3|4|5|6|7|J|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|K|8|@$D|L|E|M|F|G]]|9|@]|A|$]]|$1|H|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|I|$]]

As @hitec said, you have to be sure that you have the right permissions, if you do, you can use this line to ensure the existence of the directory:

<code>Directory.CreateDirectory(Path.GetDirectoryName(filePath))</code>

blocks|key|1233849|text|var+filePath+=+context.Server.MapPath(Convert.ToString(ConfigurationManager.AppSettings["ErrorLogFile"]));|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1233850|var+file+=+new+FileInfo(filePath);|1233851|file.Directory.Create();如果目录已存在，则此方法不执行任何操作。|1233852|var+sw+=+new+StreamWriter(filePath,+true);|1233853|sw.WriteLine(Enter+your+message+here);|1233854|sw.Close();|1233855|entityMap^0|0|2Y|0|0|Y|0|0|O|0|0|16|0|0|12|0|0|B|0^^$0|@$1|2|3|4|5|6|7|R|8|@$9|S|A|T|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|U|8|@$9|V|A|W|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|X|8|@$9|Y|A|Z|B|C]]|D|@]|E|$]]|$1|J|3|K|5|6|7|10|8|@$9|11|A|12|B|C]]|D|@]|E|$]]|$1|L|3|M|5|6|7|13|8|@$9|14|A|15|B|C]]|D|@]|E|$]]|$1|N|3|O|5|6|7|16|8|@$9|17|A|18|B|C]]|D|@]|E|$]]|$1|P|3|-4|5|6|7|19|8|@]|D|@]|E|$]]]|Q|$]]

<code>var filePath = context.Server.MapPath(Convert.ToString(ConfigurationManager.AppSettings["ErrorLogFile"]));</code>

<code>var file = new FileInfo(filePath);</code>

<code>file.Directory.Create();</code> If the directory already exists, this method does nothing.

<code>var sw = new StreamWriter(filePath, true);</code>

<code>sw.WriteLine(Enter your message here);</code>

<code>sw.Close();</code>

blocks|key|1233906|text|将文件移动到不存在的目录的一种优雅方法是为原生FileInfo类创建以下扩展：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1233907|public+static+class+FileInfoExtension
{
++++//second+parameter+is+need+to+avoid+collision+with+native+MoveTo
++++public+static+void+MoveTo(this+FileInfo+file,+string+destination,+bool+autoCreateDirectory)+{+

++++++++if+(autoCreateDirectory)
++++++++{
++++++++++++var+destinationDirectory+=+new+DirectoryInfo(Path.GetDirectoryName(destination));

++++++++++++if+(!destinationDirectory.Exists)
++++++++++++++++destinationDirectory.Create();
++++++++}

++++++++file.MoveTo(destination);
++++}
}|code-block|syntax|javascript|1233908|然后使用全新的MoveTo扩展：|1233909|+using+<namespace+of+FileInfoExtension>;
+...
+new+FileInfo("some+path")
+++++.MoveTo("target+path",true);|1233910|检查Methods+extension+documentation。|offset|length|1233911|entityMap|0|LINK|mutability|MUTABLE|url|https://docs.microsoft.com/en-us/dotnet/csharp/programming-guide/classes-and-structs/extension-methods^0|0|0|0|0|2|V|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|X|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Y|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|Z|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|10|8|@]|9|@$M|11|N|12|1|13]]|A|$]]|$1|O|3|-4|5|6|7|14|8|@]|9|@]|A|$]]]|P|$Q|$5|R|S|T|A|$U|V]]]]

An elegant way to move your file to an nonexistent directory is to create the following extension to native FileInfo class:

<pre><code>public static class FileInfoExtension
{
 //second parameter is need to avoid collision with native MoveTo
 public static void MoveTo(this FileInfo file, string destination, bool autoCreateDirectory) { 

 if (autoCreateDirectory)
 {
 var destinationDirectory = new DirectoryInfo(Path.GetDirectoryName(destination));

 if (!destinationDirectory.Exists)
 destinationDirectory.Create();
 }

 file.MoveTo(destination);
 }
}
</code></pre>

Then use brand new MoveTo extension:

<pre><code> using &lt;namespace of FileInfoExtension&gt;;
 ...
 new FileInfo("some path")
 .MoveTo("target path",true);
</code></pre>

Check <a href="https://docs.microsoft.com/en-us/dotnet/csharp/programming-guide/classes-and-structs/extension-methods" rel="nofollow noreferrer">Methods extension documentation</a>.

I have a piece of code here that breaks if the directory doesn't exist:

<pre><code>System.IO.File.WriteAllText(filePath, content);
</code></pre>

In one line (or a few lines), is it possible to check if the directory leading to the new file doesn't exist and if not, to create it before creating the new file?

I'm using .NET 3.5.

How do I create directory if it doesn't exist to create a file?

我这里有一段代码，如果目录不存在，它就会崩溃：System.IO.File.WriteAllText(filePath, content);在一行(或几行)中，是否可以检查通向新文件的目录是否不存在，如果不存在，则在创建新文件之前创建该目录？我使用的是.NET 3.5。

问如果不存在创建文件的目录，如何创建？
EN

社区

活动

资源

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问如果不存在创建文件的目录，如何创建？EN

社区

活动

资源

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问如果不存在创建文件的目录，如何创建？
EN