FileInfo.Length 属性
获取当前文件的大小。
**命名空间:**System.IO
**程序集:**mscorlib(在 mscorlib.dll 中)
语法
声明
Public ReadOnly Property Length As Long
用法
Dim instance As FileInfo
Dim value As Long
value = instance.Length
public long Length { get; }
public:
property long long Length {
long long get ();
}
/** @property */
public long get_Length ()
public function get Length () : long
属性值
当前文件的大小。
异常
异常类型 | 条件 |
---|---|
Refresh 无法更新文件或目录的状态。 |
|
文件不存在。 - 或 - 为一个目录调用 Length 属性。 |
备注
如果包含该文件的文件系统不支持此信息,则此属性值为 空引用(在 Visual Basic 中为 Nothing)。
下表列出了其他典型或相关的 I/O 任务的示例。
若要执行此操作... |
请参见本主题中的示例... |
---|---|
创建文本文件。 |
|
写入文本文件。 |
|
读取文本文件。 |
|
向文件中追加文本。 |
|
复制文件。 |
|
重命名或移动文件。 |
|
读取二进制文件。 |
|
写入二进制文件。 |
|
创建子目录。 |
|
查看目录中的文件。 |
|
按大小对目录中的文件排序。 |
|
设置文件属性。 |
示例
下面的示例显示指定文件的大小。
' The following example displays the names and sizes
' of the files in the specified directory.
Imports System
Imports System.IO
Public Class FileLength
Public Shared Sub Main()
' Make a reference to a directory.
Dim di As New DirectoryInfo("c:\")
' Get a reference to each file in that directory.
Dim fiArr As FileInfo() = di.GetFiles()
' Display the names and sizes of the files.
Dim f As FileInfo
Console.WriteLine("The directory {0} contains the following files:", di.Name)
For Each f In fiArr
Console.WriteLine("The size of {0} is {1} bytes.", f.Name, f.Length)
Next f
End Sub 'Main
End Class 'FileLength
// The following example displays the names and sizes
// of the files in the specified directory.
using System;
using System.IO;
public class FileLength
{
public static void Main()
{
// Make a reference to a directory.
DirectoryInfo di = new DirectoryInfo("c:\\");
// Get a reference to each file in that directory.
FileInfo[] fiArr = di.GetFiles();
// Display the names and sizes of the files.
Console.WriteLine("The directory {0} contains the following files:", di.Name);
foreach (FileInfo f in fiArr)
Console.WriteLine("The size of {0} is {1} bytes.", f.Name, f.Length);
}
}
// The following example displays the names and sizes
// of the files in the specified directory.
using namespace System;
using namespace System::IO;
int main()
{
// Make a reference to a directory.
DirectoryInfo^ di = gcnew DirectoryInfo( "c:\\" );
// Get a reference to each file in that directory.
array<FileInfo^>^fiArr = di->GetFiles();
// Display the names and sizes of the files.
Console::WriteLine( "The directory {0} contains the following files:", di->Name );
System::Collections::IEnumerator^ myEnum = fiArr->GetEnumerator();
while ( myEnum->MoveNext() )
{
FileInfo^ f = safe_cast<FileInfo^>(myEnum->Current);
Console::WriteLine( "The size of {0} is {1} bytes.", f->Name, f->Length );
}
}
// The following example displays the names and sizes
// of the files in the specified directory.
import System.*;
import System.IO.*;
public class FileLength
{
public static void main(String[] args)
{
// Make a reference to a directory.
DirectoryInfo di = new DirectoryInfo("c:\\");
// Get a reference to each file in that directory.
FileInfo fiArr[] = di.GetFiles();
// Display the names and sizes of the files.
Console.WriteLine("The directory {0} contains the following files:",
di.get_Name());
for (int iCtr = 0; iCtr < fiArr.length; iCtr++) {
FileInfo f = fiArr[iCtr];
Console.WriteLine("The size of {0} is {1} bytes.", f.get_Name(),
System.Convert.ToString(f.get_Length()));
}
} //main
} //FileLength
平台
Windows 98、Windows 2000 SP4、Windows CE、Windows Millennium Edition、Windows Mobile for Pocket PC、Windows Mobile for Smartphone、Windows Server 2003、Windows XP Media Center Edition、Windows XP Professional x64 Edition、Windows XP SP2、Windows XP Starter Edition
.NET Framework 并不是对每个平台的所有版本都提供支持。有关受支持版本的列表,请参见系统要求。
版本信息
.NET Framework
受以下版本支持:2.0、1.1、1.0
.NET Compact Framework
受以下版本支持:2.0、1.0
请参见
参考
FileInfo 类
FileInfo 成员
System.IO 命名空间