文件。C# 中的 SetLastWriteTime()方法，示例
原文:https://www . geesforgeks . org/file-setlastwritetime-method-in-csharp-with-examples/
文件。SetLastWriteTime(String) 是一个内置的 File 类方法，用于设置指定文件上次写入的日期和时间。
语法:
public static void SetLastWriteTime (string path, DateTime lastWriteTime);
参数:该函数接受两个参数，如下图所示:
- Path: This is the specified file for which date and time information is set.
- Last write time: This is the specified local last write date and time of the path.
例外:
- 参数异常:路径是一个零长度字符串，只包含空格或一个或多个无效字符，如 InvalidPathChars 所定义。
- ArgumentNullException:路径为空。
- 路径工具异常:指定的路径、文件名或两者都超过了系统定义的最大长度。
- 文件未找到异常:未找到指定的路径。
- 未授权访问异常:调用方没有所需的权限。
- notSupportDexception:路径的格式无效。
- ArgumentOutOfRangeException:最后写入时间指定的值超出了此操作允许的日期或时间范围。
下面是说明文件的程序。方法。 程序 1: 在运行下面的代码之前，创建了一个文件 file.txt ，内容如下所示-
c sharp . c sharp . c sharp . c sharp
// C# program to illustrate the usage
// of File.SetLastWriteTime() method
// Using System and System.IO namespaces
using System;
using System.IO;
class GFG {
public static void Main()
{
// Specifying a file
string myfile = @"file.txt";
// Calling the SetLastWriteTime() function
// to set last written date and time
File.SetLastWriteTime(myfile, new DateTime(2020,
5, 4, 4, 5, 7));
// Getting the last written date and time
// of the file
DateTime dt = File.GetLastWriteTime(myfile);
Console.WriteLine("The last written date and "+
"time for this file was {0}.", dt);
}
}
输出:
The last written date and time for this file was 5/4/2020 4:05:07 AM.
程序 2: 最初没有创建文件。在代码下面，它自己创建了一个文件 file.txt 并打印最后一次写入的日期和时间。
c sharp . c sharp . c sharp . c sharp
// C# program to illustrate the usage
// of File.SetLastWriteTime() method
// Using System and System.IO namespaces
using System;
using System.IO;
class GFG {
public static void Main()
{
// Specifying a file
string path = @"file.txt";
// Checking the existence of the file
if (!File.Exists(path)) {
File.Create(path);
}
// Calling the SetLastWriteTime() function
// to set last written date and time
File.SetLastWriteTime(path, new DateTime(2019,
5, 4, 4, 5, 7));
// Getting the last written date and time
// of the specified file
DateTime dt = File.GetLastWriteTime(path);
Console.WriteLine("The last written date and "+
"time for this file was {0}.", dt);
}
}
执行:
The last written date and time for this file was 5/4/2019 4:05:07 AM.
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