DirectoryInfo.Exists Property
Definition
Important
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Gets a value indicating whether the directory exists.
public:
virtual property bool Exists { bool get(); };
public override bool Exists { get; }
member this.Exists : bool
Public Overrides ReadOnly Property Exists As Boolean
Property Value
true
if the directory exists; otherwise, false
.
Examples
The following example demonstrates a use of the Exists
property in the context of copying a source directory to a target directory.
using namespace System;
using namespace System::IO;
// Copy a source directory to a target directory.
void CopyDirectory( String^ SourceDirectory, String^ TargetDirectory )
{
DirectoryInfo^ source = gcnew DirectoryInfo( SourceDirectory );
DirectoryInfo^ target = gcnew DirectoryInfo( TargetDirectory );
//Determine whether the source directory exists.
if ( !source->Exists )
return;
if ( !target->Exists )
target->Create();
//Copy files.
array<FileInfo^>^sourceFiles = source->GetFiles();
for ( int i = 0; i < sourceFiles->Length; ++i )
File::Copy( sourceFiles[ i ]->FullName, String::Concat( target->FullName, "\\", sourceFiles[ i ]->Name ), true );
//Copy directories.
array<DirectoryInfo^>^sourceDirectories = source->GetDirectories();
for ( int j = 0; j < sourceDirectories->Length; ++j )
CopyDirectory( sourceDirectories[ j ]->FullName, String::Concat( target->FullName, "\\", sourceDirectories[ j ]->Name ) );
}
int main()
{
CopyDirectory( "D:\\Tools", "D:\\NewTools" );
}
using System;
using System.IO;
namespace DirectoryInfoCS2
{
class Class1
{
// Copy a source directory to a target directory.
static public void CopyDirectory(string SourceDirectory, string TargetDirectory)
{
DirectoryInfo source = new DirectoryInfo(SourceDirectory);
DirectoryInfo target = new DirectoryInfo(TargetDirectory);
//Determine whether the source directory exists.
if(!source.Exists)
return;
if(!target.Exists)
target.Create();
//Copy files.
FileInfo[] sourceFiles = source.GetFiles();
for(int i = 0; i < sourceFiles.Length; ++i)
File.Copy(sourceFiles[i].FullName, target.FullName + "\\" + sourceFiles[i].Name,true);
//Copy directories.
DirectoryInfo[] sourceDirectories = source.GetDirectories();
for(int j = 0; j < sourceDirectories.Length; ++j)
CopyDirectory(sourceDirectories[j].FullName,target.FullName +"\\" + sourceDirectories[j].Name);
}
static void Main(string[] args)
{
CopyDirectory("D:\\Tools","D:\\NewTools");
}
}
}
open System.IO
// Copy a source directory to a target directory.
let rec copyDirectory sourceDirectory targetDirectory =
let source = DirectoryInfo sourceDirectory
let target = DirectoryInfo targetDirectory
//Determine whether the source directory exists.
if source.Exists then
if target.Exists then
target.Create()
//Copy files.
let sourceFiles = source.GetFiles()
for file in sourceFiles do
File.Copy(file.FullName, target.FullName + "\\" + file.Name,true)
//Copy directories.
let sourceDirectories = source.GetDirectories()
for dir in sourceDirectories do
copyDirectory dir.FullName (target.FullName + "\\" + dir.Name)
copyDirectory "D:\\Tools" "D:\\NewTools"
Imports System.IO
Module Module1
Public Sub CopyDirectory(ByVal SourceDirectory As String, ByVal TargetDirectory As String)
Dim source As DirectoryInfo = New DirectoryInfo(SourceDirectory)
Dim target As DirectoryInfo = New DirectoryInfo(TargetDirectory)
'Determine whether the source directory exists.
If (source.Exists = False) Then
Return
End If
If (target.Exists = False) Then
target.Create()
End If
'Copy files.
Dim sourceFiles As FileInfo() = source.GetFiles()
Dim i, j As Integer
For i = 0 To sourceFiles.Length - 1
File.Copy(sourceFiles(i).FullName, target.FullName + "\\" + sourceFiles(i).Name, True)
Next i
'Copy directories.
Dim sourceDirectories As DirectoryInfo() = source.GetDirectories()
For j = 0 To sourceDirectories.Length - 1
CopyDirectory(sourceDirectories(j).FullName, target.FullName + "\\" + sourceDirectories(j).Name)
Next j
source = Nothing
target = Nothing
End Sub
Sub Main()
CopyDirectory("D:\\Tools", "D:\\NewTools")
End Sub
End Module
Remarks
The Exists property returns false
if any error occurs while trying to determine if the specified file exists. This can occur in situations that raise exceptions such as passing a file name with invalid characters or too many characters, a failing or missing disk, or if the caller does not have permission to read the file.
Applies to
See also
Pripomienky
https://aka.ms/ContentUserFeedback.
Pripravujeme: V priebehu roka 2024 postupne zrušíme službu Problémy v službe GitHub ako mechanizmus pripomienok týkajúcich sa obsahu a nahradíme ju novým systémom pripomienok. Ďalšie informácie nájdete na stránke:Odoslať a zobraziť pripomienky pre