Question

I am currently building a method that takes an object that is of type DataRow from a typed DataSet, and then returning a string in JSON format of the fields in the DataRow (for use in a Web Service).

By using System.Reflection, I am doing something like this :

public string getJson(DataRow r)     {         Type controlType = r.GetType();         PropertyInfo[] props = controlType.GetProperties();         foreach (PropertyInfo controlProperty in props)         {          }         return '';     } 

And then in the foreach statement, I would iterate every field and get the field name and value, and format it into JSON.

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The problem is that when iterating over the props (of type PropertyInfo[]), I am getting properties that I do not want to be iterated over:

alt text http://img88.imageshack.us/img88/2001/datarowreflectionht0.gif

As you can see from the above image, I only need the fields that range from 0 - 11 in the props array, because those are the ‘real fields’ of this particular typed row.

So my question is, How can I get the fields of the Typed DataRow only, and not the other ‘metadata’ ?

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[UPDATE with Solution]

As Mehrdad Afshari suggested, instead of using Reflection, I am using the Table.Columns array.

Here is the completed function:

public string GetJson(DataRow r) {     int index = 0;     StringBuilder json = new StringBuilder();     foreach (DataColumn item in r.Table.Columns)     {         json.Append(String.Format('\'{0}\' : \'{1}\'', item.ColumnName, r[item.ColumnName].ToString()));         if (index < r.Table.Columns.Count - 1)         {             json.Append(', ');         }         index++;     }     return '{' + json.ToString() + '}'; } 

Answer 1

Why don’t you use row.Table.Columns property instead of reflection?