Sitecore Quick Tip: Getting and Setting SafeDictionary

Sitecore’s SafeDictionary is used throughout Sitecore’s libraries and the purpose of it (as opposed to using Dictionary) is to allow dictionary[key] without exceptions, instead returning default(T).

To read values into a SafeDictionary from a Sitecore field that uses a query string internally (validator parameters, rendering parameters, name value field etc.) you can use:


var parameters = Sitecore.Web.WebUtil.ParseQueryString(item["Field Name"]);

Then of course you can modify the SafeDictionary:


if (!parameters.ContainsKey("foo"))
{
    parameters.Add("foo", "bar");
}

And writing the SafeDictionary back to the field:


item["Field Name"] = string.Join("&", parameters.Select(x => $"{System.Web.HttpUtility.UrlEncode(x.Key)}={System.Web.HttpUtility.UrlEncode(x.Value)}"));

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