找不到任务内创建的目录和文件

Question

var tasks = new List<Task>();
var path=@"D:\path";

for(int i=0;i<8;i++)
{
    var task = Task.Factory.StartNew(() => {
    DataSet dataset;

    //Some xml work to fill dataset...

    if(!Directory.Exists(path))
        Directory.Create(path);

    dataset.WriteXml(Path.Combine(path, "filename.xml");

    });
    tasks.Add(task);

}

while(tasks.Count>0)
{
    int i = Task.WaitAny(tasks.ToArray());
    tasks.RemoveAt(i);

    string[] files;
    files = Directory.GetFiles(path);
}

We are trying to get files for each task after it will finish its work. But the problem is, when the code comes to Directory.GetFiles() method, it could not find the releated path (Throws DirectoryNotFound exception). But when we look the path manually, there is a folder with xml files. Sometimes code can find the directory but returns no files even there is a file inside the folder. This situation continues till tasks count comes zero.

I also tried Task.ContinueWith but still not solved. It looks like synchronization problem because while debuging the code works correctly. Is it possible Task.WaitAny doesn't wait the task completion?

We are using .NET 4.0.

Answer 1

you're missing a backslash in your path, so when concatenating you're writing to

@"D:\path" + "filename.xml"

which is

@"D:\pathfilename.xml"

and NOT

@"D:\path\filename.xml"

Nothing to do with tasks at all there :)