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POExtension method to get list of dictionaries as dataset?
 

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  1. POExtension method to get list of dictionaries as dataset?
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    <p>I'm trying to cast a List of Dictionary objects to a dataset. The List comes from a JSON parser. I decided to use this as an opportunity to learn about extension methods.</p> <p>The extension method for a single dictionary works, but the method for a List of Dictionaries doesn't "look" right to me, mainly because the call becomes</p> <pre><code>DataSet myExampleDataSet = myExampleDictionary.ToDataSet&lt;Dictionary&lt;string,string&gt;,string,string&gt;(); </code></pre> <p>Am I missing something? Does it really have to be this complicated? Should I just throw the Dictionary .ToDataSet method in a foreach?</p> <pre><code>using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Data; using System.Collections; //fixed code below namespace TT.Utils { public static class DictionaryExtensions { /// &lt;summary&gt; /// Dictionary to DataSet /// &lt;/summary&gt; /// &lt;typeparam name="TKey"&gt;&lt;/typeparam&gt; /// &lt;typeparam name="TValue"&gt;&lt;/typeparam&gt; /// &lt;param name="currentDictionary"&gt;&lt;/param&gt; /// &lt;returns&gt;&lt;/returns&gt; public static DataSet ToDataSet&lt;TKey, TValue&gt;(this IDictionary&lt;TKey, TValue&gt; currentDictionary) { DataSet exportedDataSet = new DataSet(); DataTable exportedDataTable = exportedDataSet.Tables.Add(); foreach (TKey key in currentDictionary.Keys) { exportedDataTable.Columns.Add(key.ToString()); } DataRow newRow = exportedDataTable.NewRow(); foreach (KeyValuePair&lt;TKey, TValue&gt; entry in currentDictionary) { string key = entry.Key.ToString(); string val = string.Empty; if (entry.Value != null) { val = entry.Value.ToString(); } newRow[key] = val; } exportedDataSet.Tables[0].Rows.Add(newRow); return exportedDataSet; } /// &lt;summary&gt; /// List of dictionaries to dataset /// &lt;/summary&gt; /// &lt;typeparam name="TKey"&gt;&lt;/typeparam&gt; /// &lt;typeparam name="TValue"&gt;&lt;/typeparam&gt; /// &lt;param name="currentList"&gt;&lt;/param&gt; /// &lt;returns&gt;&lt;/returns&gt; public static DataSet ToDataSet&lt;TKey,TValue&gt;(this IList&lt;Dictionary&lt;TKey,TValue&gt; currentList) { DataSet exportedDataSet = new DataSet(); DataTable exportedDataTable = exportedDataSet.Tables.Add(); foreach (Dictionary&lt;TKey, TValue&gt; currentDictionary in currentList.Cast&lt;Dictionary&lt;TKey,TValue&gt;&gt;()) { foreach (TKey key in currentDictionary.Keys) { if (!exportedDataTable.Columns.Contains(key.ToString())) exportedDataTable.Columns.Add(key.ToString()); } DataRow newRow = exportedDataTable.NewRow(); foreach (KeyValuePair&lt;TKey, TValue&gt; entry in currentDictionary) { string key = entry.Key.ToString(); string val = string.Empty; if (entry.Value != null) { val = entry.Value.ToString(); } newRow[key] = val; } exportedDataSet.Tables[0].Rows.Add(newRow); } return exportedDataSet; } } } </code></pre>
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    1. USAdam Baxter
    1. USAdam Baxter
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      1. USAdam Baxter
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    1. COYour `ToDataSet` is putting three types in the `<>`. Does it really compiles?
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      1. USxandy
 

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