blocks|key|1116566|text|System.IO.Directory+myDir+=+GetMyDirectoryForTheExample();
int+count+=+myDir.GetFiles().Length;|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1116567|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>System.IO.Directory myDir = GetMyDirectoryForTheExample();
int count = myDir.GetFiles().Length;
</code></pre>

blocks|key|1116583|text|最巧妙的方法是使用LINQ|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1116584|var+fileCount+=+(from+file+in+Directory.EnumerateFiles(@"H:\iPod_Control\Music",+"*.mp3",+SearchOption.AllDirectories)
++++++++++++++++++++++++select+file).Count();|code-block|syntax|javascript|1116585|entityMap|0|LINK|mutability|MUTABLE|url|http://en.wikipedia.org/wiki/Language_Integrated_Query^0|9|4|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]]]

The slickest method woud be to use <a href="http://en.wikipedia.org/wiki/Language_Integrated_Query" rel="noreferrer">LINQ</a>:

<pre><code>var fileCount = (from file in Directory.EnumerateFiles(@"H:\iPod_Control\Music", "*.mp3", SearchOption.AllDirectories)
 select file).Count();
</code></pre>

blocks|key|1116602|text|System.IO.DirectoryInfo+dir+=+new+System.IO.DirectoryInfo("SourcePath");
int+count+=+dir.GetFiles().Length;|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1116603|你可以用这个。|unstyled|1116604|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|J|8|@]|9|@]|A|$]]|$1|G|3|-4|5|F|7|K|8|@]|9|@]|A|$]]]|H|$]]

<pre><code>System.IO.DirectoryInfo dir = new System.IO.DirectoryInfo("SourcePath");
int count = dir.GetFiles().Length;
</code></pre>

You can use this.

blocks|key|1331756|text|从目录读取PDF文件：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1331757|var+list+=+Directory.GetFiles(@"C:\ScanPDF",+"*.pdf");
if+(list.Length+>+0)
{

}|code-block|syntax|javascript|1331758|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|$]]

Reading PDF files from a directory:

<pre><code>var list = Directory.GetFiles(@"C:\ScanPDF", "*.pdf");
if (list.Length &gt; 0)
{

}
</code></pre>

blocks|key|1331811|text|int+fileCount+=+Directory.GetFiles(path,+"*.*",+SearchOption.AllDirectories).Length;+//+Will+Retrieve+count+of+all+files+in+directry+and+sub+directries

int+fileCount+=+Directory.GetFiles(path,+"*.*",+SearchOption.TopDirectory).Length;+//+Will+Retrieve+count+of+all+files+in+directry+but+not+sub+directries

int+fileCount+=+Directory.GetFiles(path,+"*.xml",+SearchOption.AllDirectories).Length;+//+Will+Retrieve+count+of+files+XML+extension+in+directry+and+sub+directries|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1331812|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>int fileCount = Directory.GetFiles(path, "*.*", SearchOption.AllDirectories).Length; // Will Retrieve count of all files in directry and sub directries

int fileCount = Directory.GetFiles(path, "*.*", SearchOption.TopDirectory).Length; // Will Retrieve count of all files in directry but not sub directries

int fileCount = Directory.GetFiles(path, "*.xml", SearchOption.AllDirectories).Length; // Will Retrieve count of files XML extension in directry and sub directries
</code></pre>

blocks|key|1116689|text|int+filesCount+=+Directory.EnumerateFiles(Directory).Count();|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1116690|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>int filesCount = Directory.EnumerateFiles(Directory).Count();
</code></pre>

blocks|key|1331880|text|System.IO名称空间提供了这样一种工具。它包含允许读取和写入文件和数据流的类型，以及提供基本文件和目录支持的类型。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1331881|例如，如果您想要计算C:\目录中的文件数，您可以这样说(请注意，我们必须用另一个'\‘字符转义’\‘字符)：|offset|length|style|CODE|1331882|System.IO.DirectoryInfo+dir+=+new+System.IO.DirectoryInfo("C:\\");
int+count+=+dir.GetFiles().Length;|code-block|syntax|javascript|1331883|您还可以通过使用逐字字符串文字来转义'\‘字符，这样字符串中通常会被解释为转义序列的任何内容都会被忽略，例如，您可以说(@"C:\")而不是("C:\\")|1331884|entityMap^0|0|A|3|0|0|1N|8|1Y|8|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|$]]|$1|H|3|I|5|J|7|U|8|@]|9|@]|A|$K|L]]|$1|M|3|N|5|6|7|V|8|@$D|W|E|X|F|G]|$D|Y|E|Z|F|G]]|9|@]|A|$]]|$1|O|3|-4|5|6|7|10|8|@]|9|@]|A|$]]]|P|$]]

The System.IO namespace provides such a facility. It contains types that allow reading and writing to files and data streams, and types that provide basic file and directory support.
For example, if you wanted to count the number of files in the <code>C:\</code> directory, you would say (Note that we had to escape the '\' character with another '\'):
<pre><code>System.IO.DirectoryInfo dir = new System.IO.DirectoryInfo(&quot;C:\\&quot;);
int count = dir.GetFiles().Length;
</code></pre>
You could also escape the '\' character by using the verbatim string literal whereby anything in the string that would normally be interpreted as an escape sequence is ignored, i.e. instead of <code>(&quot;C:\\&quot;)</code>, you could say, <code>(@&quot;C:\&quot;)</code>

blocks|key|1116675|text|要使用LINQ获取特定类型扩展的计数，可以使用以下简单代码：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1116676|Dim+exts()+As+String+=+{".docx",+".ppt",+".pdf"}

Dim+query+=+(From+f+As+FileInfo+In+directory.GetFiles()).Where(Function(f)+exts.Contains(f.Extension.ToLower()))

Response.Write(query.Count())|code-block|syntax|javascript|1116677|entityMap|0|LINK|mutability|MUTABLE|url|http://en.wikipedia.org/wiki/Language_Integrated_Query^0|3|4|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]]]

To get the count of certain type extensions using <a href="http://en.wikipedia.org/wiki/Language_Integrated_Query" rel="nofollow noreferrer">LINQ</a> you could use this simple code:

<pre><code>Dim exts() As String = {".docx", ".ppt", ".pdf"}

Dim query = (From f As FileInfo In directory.GetFiles()).Where(Function(f) exts.Contains(f.Extension.ToLower()))

Response.Write(query.Count())
</code></pre>

问文件夹中的文件数
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