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  1. PO
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    <p>I would use a <code>Dictionary&lt;string,string&gt;</code> with the FullName (path+file+ext) changed to lower case as key and the FullName unchanged as value. Then split the required parts using the static methods <code>GetDirectoryName</code> and <code>GetFileName</code> of the <code>System.IO.Path</code> class before inserting them into the table.</p> <p><strong>EDIT</strong>: The <code>GetFiles</code> method of the <code>DirectoryInfo</code> class returns an array of <code>FileInfo</code>. <code>FileInfo</code> has a <code>FullName</code> property returning path+file+ext. You could as well store this <code>FileInfo</code> as value in your dictionary if memory consumption is not an issue. <code>FileInfo</code> has a <code>DirectoryName</code> and a <code>Name</code> property returning the two parts you need.</p> <p><strong>EDIT</strong>: Here is my implementation of a multimap which does the <code>Directory&lt;TKey,List&lt;TValue&gt;&gt;</code> stuff:</p> <pre><code>/// &lt;summary&gt; /// Represents a collection of keys and values. Multiple values can have the same key. /// &lt;/summary&gt; /// &lt;typeparam name="TKey"&gt;Type of the keys.&lt;/typeparam&gt; /// &lt;typeparam name="TValue"&gt;Type of the values.&lt;/typeparam&gt; public class MultiMap&lt;TKey, TValue&gt; : Dictionary&lt;TKey, List&lt;TValue&gt;&gt; { public MultiMap() : base() { } public MultiMap(int capacity) : base(capacity) { } /// &lt;summary&gt; /// Adds an element with the specified key and value into the MultiMap. /// &lt;/summary&gt; /// &lt;param name="key"&gt;The key of the element to add.&lt;/param&gt; /// &lt;param name="value"&gt;The value of the element to add.&lt;/param&gt; public void Add(TKey key, TValue value) { List&lt;TValue&gt; valueList; if (TryGetValue(key, out valueList)) { valueList.Add(value); } else { valueList = new List&lt;TValue&gt;(); valueList.Add(value); Add(key, valueList); } } /// &lt;summary&gt; /// Removes first occurence of a element with a specified key and value. /// &lt;/summary&gt; /// &lt;param name="key"&gt;The key of the element to remove.&lt;/param&gt; /// &lt;param name="value"&gt;The value of the element to remove.&lt;/param&gt; /// &lt;returns&gt;true if the a element is removed; false if the key or the value were not found.&lt;/returns&gt; public bool Remove(TKey key, TValue value) { List&lt;TValue&gt; valueList; if (TryGetValue(key, out valueList)) { if (valueList.Remove(value)) { if (valueList.Count == 0) { Remove(key); } return true; } } return false; } /// &lt;summary&gt; /// Removes all occurences of elements with a specified key and value. /// &lt;/summary&gt; /// &lt;param name="key"&gt;The key of the elements to remove.&lt;/param&gt; /// &lt;param name="value"&gt;The value of the elements to remove.&lt;/param&gt; /// &lt;returns&gt;Number of elements removed.&lt;/returns&gt; public int RemoveAll(TKey key, TValue value) { List&lt;TValue&gt; valueList; int n = 0; if (TryGetValue(key, out valueList)) { while (valueList.Remove(value)) { n++; } if (valueList.Count == 0) { Remove(key); } } return n; } /// &lt;summary&gt; /// Gets the total number of values contained in the MultiMap. /// &lt;/summary&gt; public int CountAll { get { int n = 0; foreach (List&lt;TValue&gt; valueList in Values) { n += valueList.Count; } return n; } } /// &lt;summary&gt; /// Determines whether the MultiMap contains a element with a specific key / value pair. /// &lt;/summary&gt; /// &lt;param name="key"&gt;Key of the element to search for.&lt;/param&gt; /// &lt;param name="value"&gt;Value of the element to search for.&lt;/param&gt; /// &lt;returns&gt;true if the element was found; otherwise false.&lt;/returns&gt; public bool Contains(TKey key, TValue value) { List&lt;TValue&gt; valueList; if (TryGetValue(key, out valueList)) { return valueList.Contains(value); } return false; } /// &lt;summary&gt; /// Determines whether the MultiMap contains a element with a specific value. /// &lt;/summary&gt; /// &lt;param name="value"&gt;Value of the element to search for.&lt;/param&gt; /// &lt;returns&gt;true if the element was found; otherwise false.&lt;/returns&gt; public bool Contains(TValue value) { foreach (List&lt;TValue&gt; valueList in Values) { if (valueList.Contains(value)) { return true; } } return false; } } </code></pre>
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    1. POWhat is the fastest way to get lists of files and search through file lists repeatedly?
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    1. USOlivier Jacot-Descombes
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    1. POWhat is the fastest way to get lists of files and search through file lists repeatedly?
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    1. COWhen I am searching for a file I only have the file name from the database table. so shouldn't the key just be the file name? Since performance really matters I would rather match on the whole string. right?
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    2. COSo you know only the filename, but don't know in which directory it is? Then you could use a `Directory<string,List<string>>` or a `Directory<string,List<FileInfo>>` to store multiple file informations for the same file name.
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    3. COI am guessing (don't know for sure) but since duplicates will be rare I think having 2 lists is faster per FileType. Normal list = Dictonary<filename, PathOnly, and the duplicate list = Dictionary<filename, List<PathOnly>>. But for every positive match I will have to check the other list. hmmm
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