File.Delete(String) 方法

定义

命名空间:

System.IO

程序集:

System.Runtime.dll

Source:

File.cs

删除指定的文件。

public:
 static void Delete(System::String ^ path);

public static void Delete (string path);

static member Delete : string -> unit

Public Shared Sub Delete (path As String)

参数

path

String

要删除的文件的名称。 不支持通配符。

例外

ArgumentException

.NET Framework 和 2.1 之前的 .NET Core 版本：path是一个零长度字符串，仅包含空格，或者包含一个或多个无效字符。 你可以使用 GetInvalidPathChars() 方法查询无效字符。

ArgumentNullException

path 为 null。

DirectoryNotFoundException

指定的路径无效（例如，它位于未映射的驱动器上）。

IOException

指定的文件正在使用。

- 或 -

在文件中存在开放句柄，并且操作系统是 Windows XP 或更早的版本。 枚举目录和文件可能会导致此开放句柄出现。 有关详细信息，请参阅如何：枚举目录和文件。

NotSupportedException

path 的格式无效。

PathTooLongException

指定的路径和/或文件名超过了系统定义的最大长度。

UnauthorizedAccessException

调用方没有所要求的权限。

- 或 -

该文件是正在使用的可执行文件。

- 或 -

path 是一个目录。

- 或 -

path 指定了一个只读文件。

示例

以下示例将文件组复制到 C：\archives\2008 备份文件夹，然后将其从源文件夹删除。

string sourceDir = @"c:\current";
string backupDir = @"c:\archives\2008";

try
{
    string[] picList = Directory.GetFiles(sourceDir, "*.jpg");
    string[] txtList = Directory.GetFiles(sourceDir, "*.txt");

    // Copy picture files.
    foreach (string f in picList)
    {
        // Remove path from the file name.
        string fName = f.Substring(sourceDir.Length + 1);

        // Use the Path.Combine method to safely append the file name to the path.
        // Will overwrite if the destination file already exists.
        File.Copy(Path.Combine(sourceDir, fName), Path.Combine(backupDir, fName), true);
    }

    // Copy text files.
    foreach (string f in txtList)
    {

        // Remove path from the file name.
        string fName = f.Substring(sourceDir.Length + 1);

        try
        {
            // Will not overwrite if the destination file already exists.
            File.Copy(Path.Combine(sourceDir, fName), Path.Combine(backupDir, fName));
        }

        // Catch exception if the file was already copied.
        catch (IOException copyError)
        {
            Console.WriteLine(copyError.Message);
        }
    }

    // Delete source files that were copied.
    foreach (string f in txtList)
    {
        File.Delete(f);
    }
    foreach (string f in picList)
    {
        File.Delete(f);
    }
}

catch (DirectoryNotFoundException dirNotFound)
{
    Console.WriteLine(dirNotFound.Message);
}

let sourceDir = @"c:\current"
let backupDir = @"c:\archives\2008"

try
    let picList = Directory.GetFiles(sourceDir, "*.jpg")
    let txtList = Directory.GetFiles(sourceDir, "*.txt")

    // Copy picture files.
    for f in picList do
        // Remove path from the file name.
        let fName = f.Substring(sourceDir.Length + 1)

        // Use the Path.Combine method to safely append the file name to the path.
        // Will overwrite if the destination file already exists.
        File.Copy(Path.Combine(sourceDir, fName), Path.Combine(backupDir, fName), true)

    // Copy text files.
    for f in txtList do
        // Remove path from the file name.
        let fName = f.Substring(sourceDir.Length + 1)

        try
            // Will not overwrite if the destination file already exists.
            File.Copy(Path.Combine(sourceDir, fName), Path.Combine(backupDir, fName))

        // Catch exception if the file was already copied.
        with
        | :? IOException as copyError -> printfn $"{copyError.Message}"

    // Delete source files that were copied.
    for f in txtList do
        File.Delete f

    for f in picList do
        File.Delete f

// Catch exception if the file was already copied.
with
| :? DirectoryNotFoundException as dirNotFound -> printfn $"{dirNotFound.Message}"

Dim sourceDir As String = "c:\current"
Dim backupDir As String = "c:\archives\2008"

Try
    Dim picList As String() = Directory.GetFiles(sourceDir, "*.jpg")
    Dim txtList As String() = Directory.GetFiles(sourceDir, "*.txt")

    ' Copy picture files.
    For Each f As String In picList
        'Remove path from the file name.
        Dim fName As String = f.Substring(sourceDir.Length + 1)

        ' Use the Path.Combine method to safely append the file name to the path.
        ' Will overwrite if the destination file already exists.
        File.Copy(Path.Combine(sourceDir, fName), Path.Combine(backupDir, fName), True)
    Next

    ' Copy text files.
    For Each f As String In txtList

        'Remove path from the file name.
        Dim fName As String = f.Substring(sourceDir.Length + 1)

        Try
            ' Will not overwrite if the destination file already exists.
            File.Copy(Path.Combine(sourceDir, fName), Path.Combine(backupDir, fName))

            ' Catch exception if the file was already copied.
        Catch copyError As IOException
            Console.WriteLine(copyError.Message)
        End Try
    Next

    For Each f As String In txtList
        File.Delete(f)
    Next

    For Each f As String In picList
        File.Delete(f)
    Next

Catch dirNotFound As DirectoryNotFoundException
    Console.WriteLine(dirNotFound.Message)
End Try

注解

指定一个文件名，其中包含参数的任何相对或绝对路径信息 path 。 不能包含通配符。 相对路径信息解释为相对于当前工作目录。 若要获取当前工作目录，请参阅 GetCurrentDirectory。

如果要删除的文件不存在，则不会引发异常。

有关常见 I/O 任务的列表，请参阅 常见 I/O 任务。

另请参阅

• 文件和流 I/O
• 从文件读取文本
• 如何：将文本写入文件