负载测试异常 "file is being used by another process" C#

Question

我正在使用 Visual Studio WebPerformance Tool，我的问题是我的所有 Web 测试都运行良好，但是当我运行负载测试（100 个用户）时出现异常"The process cannot access the file because it's being used by another process"。我的结论是并发用户试图同时读取同一个文件。

在负载下不工作的代码：

int x; //user number
if(File.Exists("C:\Users\Desktop\Tests\users5a.txt"))
{
    var last_number = File.ReadAllLines("C:\Users\Desktop\Tests\users5a.txt").Last();
    x = int.Parse(last_number) + 1;
}
else
    x = 0;

System.IO.StreamWriter file = new System.IO.StreamWriter("C:\Users\Desktop\Tests\users5a.txt", true);
file.WriteLine(x);
file.Close();

Answer 1

这有效：

 EventWaitHandle waitHandle = new EventWaitHandle(true,EventResetMode.AutoReset, "SHARED_BY_ALL_PROCESSES");

    waitHandle.WaitOne();

    int x; //user number
    if (File.Exists("C:\Users\Desktop\Tests\users5a.txt"))
    {
        var last_number = File.ReadAllLines("C:\Users\Desktop\Tests\users5a.txt").Last();
        x = int.Parse(last_number) + 1;
    }
    else
        x = 0;

    System.IO.StreamWriter file = new System.IO.StreamWriter("C:\Users\Desktop\Tests\users5a.txt", true);
    file.WriteLine(x);
    file.Close();
    file.Dispose();
    waitHandle.Set();

负载测试异常 "file is being used by another process" C#

Load Tests Exception "file is being used by another process" C#

c#

performance

webtest

load-testing