Custom Delete

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tamer el mor...

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153 Posts

Custom Delete

Feb 18, 2012 06:19 AM|tamer el morsi|LINK

Hey all;

i have this table "Projects" with fields

ProjectId,

CityId,

ProjectTitle,

Photo....

now i want to clear photo field for specfic record in my table..

but the delete button would delete the entire record .

so any idea on how to add delete button for the photo field???

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adeelehsan

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Re: Custom Delete

Feb 18, 2012 07:51 AM|adeelehsan|LINK

You can set it to null using the following query:

update projects
set Photo=null
where ProjectId=1

Above is just a sample query, you have to pass corresponding project id to set its photo to null.

Please Mark As Answer if it helped.

MCSD[ASP.NET 4.5, SharePoint 2013], MCTS [WSS 3.0, MOSS 2007, SharePoint 2010], MCT
Microsoft Community Contributor Award 2011

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tamer el mor...

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153 Posts

Re: Custom Delete

Feb 18, 2012 02:05 PM|tamer el morsi|LINK

how to do it in dynamicdata page ... not in sql

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sjnaughton

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Re: Custom Delete

Feb 18, 2012 06:43 PM|sjnaughton|LINK

you need to add a button to your field template that setts the

dictionary[Column.Name] = null;

and is you store the fiel on disk also delete the file.

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

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tamer el mor...

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153 Posts

Re: Custom Delete

Feb 19, 2012 07:22 AM|tamer el morsi|LINK

can you give steps on how to code this button ...

also how to pass file name so i can delete it??

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sjnaughton

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Re: Custom Delete

Feb 19, 2012 11:11 AM|sjnaughton|LINK

What file upload field template are you using?

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

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tamer el mor...

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Re: Custom Delete

Feb 19, 2012 11:58 AM|tamer el morsi|LINK

File.ascx and File_Edit.ascx ...... the default ones

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sjnaughton

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Re: Custom Delete

Feb 19, 2012 12:12 PM|sjnaughton|LINK

There is no default File upload fiel;d template, where did you get it, coudl you post the code and markup then I can modify that and post back.

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

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tamer el mor...

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153 Posts

Re: Custom Delete

Feb 19, 2012 12:36 PM|tamer el morsi|LINK

File.ascx

<%@ Control Language="C#" CodeFile="File.ascx.cs" Inherits="FileField" %>
<asp:HyperLink ID="HyperLink1" Visible="false" Target="_blank" runat="server">Download</asp:HyperLink>

File.ascx.cs

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Collections.Specialized;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Xml.Linq;
using System.Web.DynamicData;

public partial class FileField : System.Web.DynamicData.FieldTemplateUserControl
{
    protected override void OnDataBinding(EventArgs e)
    {
        base.OnDataBinding(e);

        if (!String.IsNullOrEmpty(FieldValueString))
        {
            var metadata = MetadataAttributes.OfType<FileAttribute>().FirstOrDefault();

            if (metadata != null)
            {
                HyperLink1.NavigateUrl = Utility.FrontendVirtualPath + metadata.Path + FieldValueString;
                HyperLink1.Visible = true;
            }
        }
    }

    public override Control DataControl
    {
        get
        {
            return HyperLink1;
        }
    }
}

File_Edit.ascx

<%@ Control Language="C#" CodeFile="File_Edit.ascx.cs" Inherits="File_EditField" %>
<asp:HyperLink ID="HyperLink1" Visible="false" Target="_blank" runat="server">Download</asp:HyperLink>
<asp:FileUpload ID="FileUpload1" runat="server" />
<asp:RequiredFieldValidator runat="server" ID="RequiredFieldValidator1" CssClass="droplist"
    ControlToValidate="FileUpload1" Display="Dynamic" Enabled="false" />
<asp:RegularExpressionValidator runat="server" ID="RegularExpressionValidator1" CssClass="droplist"
    ControlToValidate="FileUpload1" Display="Dynamic" Enabled="false" />
<asp:DynamicValidator runat="server" ID="DynamicValidator1" CssClass="droplist" ControlToValidate="FileUpload1"
    Display="Dynamic" />

File_Edit.ascx.cs

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Collections.Specialized;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Xml.Linq;
using System.Web.DynamicData;
using System.IO;

public partial class File_EditField : System.Web.DynamicData.FieldTemplateUserControl
{
    protected override void OnDataBinding(EventArgs e)
    {
        base.OnDataBinding(e);

        if (!String.IsNullOrEmpty(FieldValueString))
        {
            string fileAttributePath = GetFileAttributePath();

            HyperLink1.NavigateUrl = Utility.FrontendVirtualPath + fileAttributePath + FieldValueString;
            HyperLink1.Visible = true;
        }
        else
        {
            SetUpValidator(RequiredFieldValidator1);
        }

        ViewState["FieldValueString"] = FieldValueString;

        SetUpValidator(RegularExpressionValidator1);
        SetUpValidator(DynamicValidator1);
    }

    protected override void ExtractValues(IOrderedDictionary dictionary)
    {
        if (FileUpload1.HasFile)
        {
            string fileAttributeFullPath = Utility.FrontendPhysicalPath + GetFileAttributePath();
            string fileName = Utility.GetRand() + "-" + FileUpload1.FileName;

            FileUpload1.SaveAs(fileAttributeFullPath + fileName);
            if (!String.IsNullOrEmpty(ViewState["FieldValueString"].ToString()))
                try
                {
                    File.Delete(fileAttributeFullPath + ViewState["FieldValueString"].ToString());
                }
                catch { }

            dictionary[Column.Name] = fileName;
        }
    }

    public override Control DataControl
    {
        get
        {
            return FileUpload1;
        }
    }

    private string GetFileAttributePath()
    {
        var metadata = MetadataAttributes.OfType<FileAttribute>().FirstOrDefault();

        if (metadata != null)
            return metadata.Path;
        else
            return String.Empty;
    }
}

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sjnaughton

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Re: Custom Delete

Feb 19, 2012 01:06 PM|sjnaughton|LINK

OK I woudl add a checkbox to the Field_Edit.ascx file

<asp:CheckBox ID="DeleteCheckBox" runat="server" test="Delete" />

then in the ExtractValues method check the checkbox if set set the dictionary to null this will null the value

protected override void ExtractValues(IOrderedDictionary dictionary)
{
    if (FileUpload1.HasFile)
    {
        string fileAttributeFullPath = Utility.FrontendPhysicalPath + GetFileAttributePath();
        string fileName = Utility.GetRand() + "-" + FileUpload1.FileName;

        FileUpload1.SaveAs(fileAttributeFullPath + fileName);
        if (!String.IsNullOrEmpty(ViewState["FieldValueString"].ToString()))
            try
            {
                File.Delete(fileAttributeFullPath + ViewState["FieldValueString"].ToString());
            }
            catch { }

        dictionary[Column.Name] = fileName;
    }
    if (DeleteCheckBox.Checked)
        dictionary[Column.Name] = null;
}

give that a try.

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

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tamer el mor...

Member

18 Points

153 Posts

Re: Custom Delete

Feb 19, 2012 01:51 PM|tamer el morsi|LINK

thanks it works fine ..

one thing else .. how to display file name or file icon next to file upload control .. so that i can see it in edit mode and in display mode(grid view)