C＃从字符串列表中删除文件扩展名

Question

What my program does is basically it lists file names (including it's extension) from a directory into a listbox. It then has a sorting function which sorts the list strings into alphabetical order.

Lastly it has a binary search function that allows the users to input any string which the program will then compare and display the matched results into a listbox.

Now, all these functions work perfectly however I can't seem to remove the extension off of a file name after a search.

For example in the scanning and sorting part it lists the file names as: filename.mp3

Now, what I want it do when the searching button is clicked is to remove the file extension and display just the filename.

    private void buttonSearch_Click(object sender, RoutedEventArgs e)
    {

        listBox1.Items.Clear();

        string searchString = textBoxSearchPath.Text;


        int index = BinarySearch(list1, 0, list1.Count, searchString);

        for (int n = index; n < list1.Count; n++)
        {
            //Removes file extension from last decimal point ''not working''
            int i = list1[n].LastIndexOf(".");
            if (i > 0)
                list1[n].Substring(0, i);

            // Adds items to list
            if (list1[n].IndexOf(searchString, StringComparison.OrdinalIgnoreCase) != 0) break; 
            listBox1.Items.Add(list1[n]);
        }
        MessageBox.Show("Done");
    }

Answer 1

C＃非常简单，如果某些事情需要超过2分钟， 那么框架中可能有一种方法 。

Answer 2

Try like below ite will help you....

Description : Filename without Extension

        listBox1.Items.Add(Path.GetFileNameWithoutExtension(list1[n]));

Answer 3

The Substring method returns a new fresh copy of the string, copied from the source one. If you want to "cut the extension off", then you must fetch what Substring returns and store it somewhere, ie:

int i = list1[n].LastIndexOf(".");
if (i > 0)
    list1[n] = list1[n].Substring(0, i);

However, this is quite odd way to remove an extension.

Firstly, use of Substring(0,idx) is odd, as there's a Remove(idx) (link) which does exactly that:

int i = list1[n].LastIndexOf(".");
if (i > 0)
    list1[n] = list1[n].Remove(i);

But, sencondly, there's even better way of doing it: the System.IO.Path class provides you with a set of well written static methods that, for example, remove the extension (edit: this is what L-Three suggested in comments), with full handling of dots and etc:

var str = System.IO.Path.GetFileNameWithoutExtension("myfile.txt"); // == "myfile"

See MSDN link

It still returns a copy and you still have to store the result somewhere!

list1[n] = Path.GetFileNameWithoutExtension( list1[n] );

Answer 4

使用Path.GetFileNameWithoutExtension

Answer 5

Use Path.GetFileNameWithoutExtension method. Quite easy I guess.

http://msdn.microsoft.com/en-us/library/system.io.path.getfilenamewithoutextension.aspx

Answer 6

Not sure how you've implemented your directory searching, but you can leverage LINQ to your advantage in these situations for clean, easy to read code:

var files = Directory.EnumerateFiles(@"\\PathToFiles")
            .Select(f => Path.GetFileNameWithoutExtension(f));

If you're using .NET 4.0, Enumerate files seems to be a superior choice over GetFiles. However it also sounds like you want to get both the full file path and the file name without extension. Here's how you could create a Dictionary so you'd eliminate looping through the collection twice:

var files = Directory.EnumerateFiles(@"\\PathToFiles")
            .ToDictionary(f => f, n => Path.GetFileNameWithoutExtension(n));