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2013-02-14T14:40:19.263
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2013-02-14T15:07:16.807
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2013-02-14T15:07:16.807
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This is by design - each key in a <code>Hashtable</code> is unique, and assigning a value to a key that already exists will overwrite that value when using the indexing operator <code>[]</code>. I would suggest a couple of changes: First, avoid using <code>Hashtable</code> altogether if possible, and instead use one of the generic collections e.g. <code>Dictionary<,></code>. If you do in fact need multiple values per key, you can probably use something along the following lines: <pre><code>var dict = new Dictionary<string, List<string>>(); foreach (XmlNode node in xnode) { var key = node.Attributes["key"].Value; List<string> values; if (!dict.TryGetValue(key, out values)) { values = new List<string>(); dict.Add(key, values); } values.Add(node.Attributes["value"].Value); } </code></pre> Or to use Linq to construct the dictionary, you can use something like: <pre><code>var dict = xnode.Cast<XmlNode>() .GroupBy(n => n.Attributes["key"].Value, n => n.Attributes["value"].Value) .ToDictionary(g => g.Key, g => g.ToList()); </code></pre> If you absolutely have to use <code>Hashtable</code> then the above can be adapted as follows: <pre><code>var hash = new Hashtable(); foreach (XmlNode node in xnode) { var key = node.Attributes["key"].Value; var values = (List<string>)hash[key]; if (values == null) { values = new List<string>(); hash.Add(key, values); } values.Add(node.Attributes["value"].Value); } </code></pre>
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1. POHow to add Duplicate Entries to Hashtable in C#
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1. COBut my task is do in Hashtable only ..is thr any way
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 USAravind Srinivas
2. CO@user2046631 I have updated my answer with a Hashtable version, but as indicated, unless there is a legitimate reason to use the non-generic collection, the generic version is considerably cleaner (no casting from `object`, use of `TryGetValue` etc.)
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