Programmatically add a new field in a template in sitecore

Question

In Sitecore is it possible to programmatically add a new field in a template?

I have a template "DictionaryName", in this template I want to add a field "Newname" with its type "Single-Line Text".

Answer 1

I wrote and tested this code for you - it worked out perfect on my machine and created new single line field within template specified. Here is the method:

    private void AddFieldToTemplate(string fieldName, string tempatePath)
    {
        const string templateOftemplateFieldId = "{455A3E98-A627-4B40-8035-E683A0331AC7}";

        // this will do on your "master" database, consider Sitecore.Context.Database if you need "web"
        var templateItem = Sitecore.Configuration.Factory.GetDatabase("master").GetItem(tempatePath);
        if (templateItem != null)
        {
            var templateSection = templateItem.Children.FirstOrDefault(i => i.Template.Name == "Template section");
            if (templateSection != null)
            {
                var newField = templateSection.Add(fieldName, new TemplateID(new ID(templateOftemplateFieldId)));
                using (new EditContext(newField))
                {
                    newField["Type"] = "Text"; // text stands for single-line lext field type
                }
            }
            {
                // there are no template sections here, you may need to create one. template has only inherited fields if any
            }
        }
    }

And below is the usage - first string parameter is the name of your new field, the second is string value for template path within the database you are using:

AddFieldToTemplate("New Single Line Field", "/sitecore/templates/Sample/Sample Item");

Replace "Sample Item" template with your template path and set desired field name to add. Also do not forget usings for namespaces:

using Sitecore;
using Sitecore.Data;
using Sitecore.Data.Items;

Hope this helps!