public static SPField EnsureField(this SPList list, SPFieldType type, string displayName, string internalName, bool isRequired)
{
SPField field = null;
try
{
list.ParentWeb.AllowUnsafeUpdates = true;
SPSecurity.RunWithElevatedPrivileges(delegate()
{
field = list.TryGetField(displayName);
if (field == null)
{
list.Fields.Add(internalName, type, isRequired);
list.Update();
var datefield = list.TryGetField(internalName);
if (datefield.Type == SPFieldType.DateTime)
{
(datefield as SPFieldDateTime).DisplayFormat = SPDateTimeFieldFormatType.DateOnly;
datefield.Update();
list.Update();
}
field = list.TryGetField(internalName);
field.RenameField(displayName);
//field.Update();
if (field.Type == SPFieldType.Note)
{
var notefield = list.TryGetField(internalName);
var f = (SPFieldMultiLineText)list.TryGetField(internalName);
f.RichText = true;
f.RichTextMode = SPRichTextMode.FullHtml;
f.Update();
f.ParentList.Update();
}
}
});
}
catch (Exception ex)
{
Log.Error(ex);
}
return(field);
}