noteditable attribute? : The Official Microsoft ASP.NET Forums

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noteditable attribute?

Jan 05, 2009 09:34 AM|LINK

I want to annotate my column that it is not editable in edit mode...

is this possible?

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Re: noteditable attribute?

Jan 05, 2009 01:03 PM|LINK

Hi M@roc, yes this is doable but not out of the box.

What you need to do is:

<div mce_keep="true">Use the ReadOnlyAttribute in System.ComponentModel and attribute upo the column you want as read only in edit mode</div>
<div mce_keep="true">Create an class that implements IAutoFieldGenrator.</div>
<div mce_keep="true">A custom DynamicField.</div>

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();


        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().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

See my blog C# Bits | Twitter @sjnaughton
Always seeking an elegant solution.

Marked as answer by m@rco on Jan 05, 2009 02:04 PM

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Re: noteditable attribute?

Jan 05, 2009 02:06 PM|LINK

I think this might work!

thanx a lot Steve!

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Re: noteditable attribute?

Mar 26, 2009 02:15 PM|LINK

Thanks, Steve. This is exactly what I was looking for. (Although I still find it hard to believe this functionality isn't "in the box".)

FYI, it looks like some stuff got stripped out of your code snippet. For example, what's online is
    // Dim oFields As New List
    var oFields = new List();
which I believe should read
    // Dim oFields As New List(Of DynamicField)
    var oFields = new List<DynamicField>

I'm guessing this has something to do with the presence of the greater-than and less-than symbols in the C# code?

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sjnaughton

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Re: noteditable attribute?

Mar 26, 2009 02:29 PM|LINK

Yep that always happens and I don't always remember to correct it sorry. We have alerted the forum, but I believe it is a long standing issue ever since Generics was introduced. [:(]

And of ryou info Rick says it will be in there in the ASP.Net 4.0 [:D]

See my blog C# Bits | Twitter @sjnaughton
Always seeking an elegant solution.