code-tutorial.com

The best resources for developers

UserControl rendering: write link to current page?

    /// <summary>
    /// Set a parameter value in a query string. If the parameter is not found in the passed in query string,
    /// it is added to the end of the query string
    /// </summary>
    /// <param name="queryString">The query string that is to be manipulated</param>
    /// <param name="paramName">The name of the parameter</param>
    /// <param name="paramValue">The value that the parameter is to be set to</param>
    /// <returns>The query string with the parameter set to the new value.</returns>
    public static string SetParameter(string queryString, string paramName, object paramValue)
    {
        //create the regex
        //match paramname=*
        //string regex = String.Format(@"{0}=[^&]*", paramName);
        string regex = @"([&?]{0,1})" + String.Format(@"({0}=[^&]*)", paramName);

        RegexOptions options = RegexOptions.RightToLeft;
        // Querystring has parameters...
        if (Regex.IsMatch(queryString, regex, options))
        {
            queryString = Regex.Replace(queryString, regex, String.Format("$1{0}={1}", paramName, paramValue));
        }
        else
        {
            // If no querystring just return the Parameter Key/Value
            if (queryString == String.Empty)
            {
                return String.Format("{0}={1}", paramName, paramValue);
            }
            else
            {
                // Append the new parameter key/value to the end of querystring
                queryString = String.Format("{0}&{1}={2}", queryString, paramName, paramValue);
            }
        }
        return queryString;
    }

Tags: asp.net custom-server-controls web-applications

Source: By Radu094 as answer to the question

This code snippet was collected from stackoverflow, and is licensed under CC BY-SA 2.5


Related code-snippets: