Making a Field Read-Only via the ReadOnlyAttribute – Dynamic Data

This article is as a result of this thread not editable attribute on the Dynamic Data Forum:

What you need to do is:

1. Use the ReadOnlyAttribute in System.ComponentModel and attribute up the column you want as read only in edit mode

2. Create an class that implements IAutoFieldGenrator.

3. A custom DynamicField.

And here's the sample:

using System.Collections;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Web.DynamicData;
using System.Web.UI;
using System.Web.UI.WebControls;

public class FieldsManager : IAutoFieldGenerator
{
    protected MetaTable _table;

    public FieldsManager(MetaTable table)
    {
        _table = table;
    }

    public ICollection GenerateFields(Control control)
    {
        var oFields = new List<DynamicField>();

        foreach (var column in _table.Columns)
        {
            // carry on the loop at the next column  
            // if scaffold table is set to false or DenyRead
            if (!column.Scaffold || column.IsLongString)
                continue;

            DynamicField f;

            // here we check to dee
            if (column.Attributes.OfType<ReadOnlyAttribute>().
                DefaultIfEmpty(new ReadOnlyAttribute(false)).
                FirstOrDefault().IsReadOnly)
                f = new DynamicReadonlyField();
            else
                f = new DynamicField();

            f.DataField = column.Name;
            oFields.Add(f);
        }
        return oFields;
    }
}

// special thanks to david Ebbo for this
public class DynamicReadonlyField : DynamicField
{
    public override void InitializeCell(
        DataControlFieldCell cell,
        DataControlCellType cellType,
        DataControlRowState rowState,
        int rowIndex)
    {
        if (cellType == DataControlCellType.DataCell)
        {
            var control = new DynamicControl() { DataField = DataField };

            // Copy various properties into the control
            control.UIHint = UIHint;
            control.HtmlEncode = HtmlEncode;
            control.NullDisplayText = NullDisplayText;

            // this the default for DynamicControl and has to be 
            // manually changed you do not need this line of code
            // its there just to remind us what we are doing.
            control.Mode = DataBoundControlMode.ReadOnly;

            cell.Controls.Add(control);
        }
        else
        {
            base.InitializeCell(cell, cellType, rowState, rowIndex);
        }
    }
}

And in the Edit page add:

protected void Page_Init(object sender, EventArgs e)
{
    DynamicDataManager1.RegisterControl(DetailsView1);
    table = DetailsDataSource.GetTable();
    DetailsView1.RowsGenerator = new FieldsManager(table);
}

In the Page_Init add the BOLD ITALIC lines

This is a direct copy of the answer I gave in the thread