Easiest way to check if file exists within a subfolder

I am going getting all the folders within a folder as follows:

foreach (DirectoryInfo directory in root.GetDirectories())

I now want to check all the files in each of those folder individualally for an XML file.If the XML file exists I want to do something.

What would be the best way to go about this开发者_开发知识库?

I know this is the basis:

   if (File.Exists("*.xml"))
        {

        }

but that is not working?

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Try this method if you want to actually do something with the XML file. If you are just checking to see if any xml file exists then I would go a different route:

foreach (DirectoryInfo directory in root.GetDirectories())
{
    foreach(string file in Directory.GetFiles(directory.FullName, "*.xml"))
    {
      //if you get in here then do something with the file
      //an "if" statement is not necessary.
    }
}

http://msdn.microsoft.com/en-us/library/wz42302f.aspx

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The Directory.GetFiles method:

if (Directory.GetFiles(@"C:\","*.xml").Length > 0) {
    // Do something
}

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As an alternative you could use Directory.GetFiles with your search pattern and action upon the found files...

var existing = Directory.GetFiles(root, "*.xml", SearchOption.AllDirectories);

//...

foreach(string found in existing) {
    //TODO: Action upon the file etc..
}

---

    foreach (DirectoryInfo directory in root.GetDirectories())
    {
        // What you have here would call a static method on the File class that has no knowledge 
        // at all of your directory object, if you want to use this then give it a fully qualified path
        // and ignore the directory calls altogether
        //if (File.Exists("*.xml"))

        FileInfo[] xmlFiles = directory.GetFiles("*.xml");
        foreach (var file in xmlFiles)
        {
          // do whatever   
        }
    }