对于以下示例代码,我没有看到日志文件" ParallelLog.txt"在C:驱动器中创建。 (为大块代码道歉!)
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Threading;
using System.IO;
namespace Logger
{
internal class Program
{
static List<Employee> employees = new List<Employee>()
{
new Employee{Name = "William", Age=30, RollNo=1234},
new Employee{Name = "Martin", Age=29, RollNo=1235},
new Employee{Name = "Richard", Age=28, RollNo=1236},
new Employee{Name = "Baldwin", Age=27, RollNo=1237}
};
static void Main(string[] args)
{
Task task = Task.Factory.StartNew(() =>
{
foreach (Employee employee in employees.AsParallel().AsOrdered())
{
WriteToLog(employee);
}
});
}
public static void WriteToLog(Employee employee)
{
static string fileName = @"C:\ParallelLog.txt";
private static object lockObject = new object();
lock (lockObject)
{
StreamWriter writer = new StreamWriter(fileName, true);
writer.WriteLine("{0} - {1} - {2}", employee.Name, employee.Age, employee.RollNo);
writer.Close();
writer.Dispose();
writer = null;
}
}
}
internal class Employee
{
public int Age { get; set; }
public string Name { get; set; }
public int RollNo { get; set; }
}
}
我的代码上面有什么问题吗?此示例是我实际项目的日志文件创建过程的基础。
答案 0 :(得分:2)
尝试以下代码
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Threading;
using System.IO;
namespace Logger
{
internal class Program
{
static List<Employee> employees = new List<Employee>()
{
new Employee{Name = "William", Age=30, RollNo=1234},
new Employee{Name = "Martin", Age=29, RollNo=1235},
new Employee{Name = "Richard", Age=28, RollNo=1236},
new Employee{Name = "Baldwin", Age=27, RollNo=1237}
};
static void Main(string[] args)
{
Task task = Task.Factory.StartNew(() =>
{
WriteToLog();
});
}
public static void WriteToLog()
{
static string fileName = @"C:\ParallelLog.txt";
using (StreamWriter writer = new StreamWriter(fileName, true))
{
foreach (Employee employee in employees.AsParallel().AsOrdered())
writer.WriteLine("{0} - {1} - {2}", employee.Name, employee.Age, employee.RollNo);
}
}
}
internal class Employee
{
public int Age { get; set; }
public string Name { get; set; }
public int RollNo { get; set; }
}
}
在这种情况下,不需要使用lock
。这将删除StreamWriter
对象的连续实例化为一个。在这里,您不必担心管理,因为这是由using
关键字处理的。有关使用StreamWriter
课程的推荐方法,请参阅MSDN。
我希望这会有所帮助。