具有扩展名和日期过滤器的C＃GetFiles

Question

I'm looking to only return .xls files that were created today from a folder containing multiple files and a range of dates.

I'm trying this:

FBD.SelectedPath = @"\\USMCO\Test\";
string[] files = Directory.GetFiles(FBD.SelectedPath, "*.xls")
               .Where(file => new FileInfo(file).CreationTime.Date == DateTime.Today.Date); 

 foreach (string file in files)
 {
     listBox1.Items.Add(Path.GetFileName(file));
 }

But get this error. CS0266 Cannot implicitly convert type 'System.Collections.Generic.IEnumerable' to 'string[]'. An explicit conversion exists (are you missing a cast?)

What am I missing here? TIA

Answer 1

Try this you were missing to call .ToArray() Method

string[] files = Directory.GetFiles(FBD.SelectedPath, "*.xls")
     .Where(file => new FileInfo(file).CreationTime.Date == DateTime.Today.Date).ToArray();

Alternate way

foreach (string file in Directory.GetFiles("", "*.xls").Where(file => 
                                    new FileInfo(file).CreationTime.Date == DateTime.Today.Date))
{
    listBox1.Items.Add(Path.GetFileName(file));
}

Answer 2

Convert the enumerable to array by calling its ToArray method:

 string[] files = Directory.GetFiles(FBD.SelectedPath, "*.xls").Where(file => 
    new FileInfo(file).CreationTime.Date == DateTime.Today.Date).ToArray(); 

Answer 3

The Where extension method returns an IEnumerable , not an array. But you don't need an array to execute a foreach loop, you can simply change string[] files = Directory.... to var files = Directory.... and continue with the rest of the code as is.

FBD.SelectedPath = @"\\USMCO\Test\";
var files = Directory.GetFiles(FBD.SelectedPath, "*.xls")
    .Where(file => new FileInfo(file).CreationTime.Date == DateTime.Today.Date); 

 foreach (string file in files)
 {
     listBox1.Items.Add(Path.GetFileName(file));
 }

However, this can be done better, using DirectoryInfo.EnumerateFiles instead of Directory.GetFiles , you can get the FileInfo directly instead of having to create one for each file:

FBD.SelectedPath = @"\\USMCO\Test\";
var files = DirectoryInfo.EnumerateFiles(FBD.SelectedPath, "*.xls")
    .Where(file => new file.CreationTime.Date == DateTime.Today.Date); 

 // file here is an instance of FileInfo!
 foreach (var file in files) 
 {
     // FileInfo.Name contains only the file name, not the entire path
     listBox1.Items.Add(file.Name); 
 }

Answer 4

You forgot to select file names:

string[] files = Directory
    .GetFiles(FBD.SelectedPath, "*.xls")
    .Select(path => new FileInfo(path)
    .Where(file => file.CreationTime.Date == DateTime.Today.Date)
    .Select(file => file.FullName)
    .ToArray(); 

Alternative solution:

string[] files = new DirectoryInfo(FBD.SelectedPath)
    .GetFiles("*.xls")
    .Where(file => file.CreationTime.Date == DateTime.Today.Date)
    .Select(file => file.FullName)
    .ToArray();