How to put an image in a GridView

8 Jul 2006 10:44 PM

Parrot

I cannot get an image to display in a column of my GridView control. I build
the fields at run time and create a table containing my data and then bind it
to the Gridview. My cod e is shown below:

DataTable dt = dataSet1.Tables.Add("Imagetable");
dt.Columns.Add(new DataColumn("File path", typeof(string)));
dt.Columns.Add(new DataColumn("Image file",
typeof(System.Web.UI.WebControls.Image)));

// this is a loop
{

DataRow dr = dataSet1.Tables["Imagetable"].NewRow();

                    dr[0] = name.ToString();
                    System.Web.UI.WebControls.Image image = new
System.Web.UI.WebControls.Image();
                    image.ImageUrl = dirpath + name;
                    image.Height = 50;
                    image.Visible = true;
                    dr[1] = image;
                    dataSet1.Tables["Imagetable"].Rows.A dd(dr);
       }

                DataView v = new DataView(dt);
                GridView1.DataSource = v;
                 GridView1.DataBind();

My first column displays ok but the second column which is the image column
does not even display a column at all or even the heading. Does anyone know
what the problem is?

9 Jul 2006 3:55 PM

Ken Cox [Microsoft MVP]

> dt.Columns.Add(new DataColumn("Image file",
> typeof(System.Web.UI.WebControls.Image)));

Is System.Web.UI.WebControls.Image a legal datatype value? Shouldn't it be
Byte?

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpref/html/frlrfsystemdatadatacolumnclassdatatypetopic.asp

Ken
Microsoft MVP [ASP.NET]

Show quoteHide quote

"Parrot" <Par***@discussions.microsoft.com> wrote in message
news:C257D9AB-4272-4F88-ACC2-4BB415143DC5@microsoft.com...
>I cannot get an image to display in a column of my GridView control. I
>build
> the fields at run time and create a table containing my data and then bind
> it
> to the Gridview. My cod e is shown below:
>
> DataTable dt = dataSet1.Tables.Add("Imagetable");
> dt.Columns.Add(new DataColumn("File path", typeof(string)));
> dt.Columns.Add(new DataColumn("Image file",
> typeof(System.Web.UI.WebControls.Image)));
>
> // this is a loop
> {
>
> DataRow dr = dataSet1.Tables["Imagetable"].NewRow();
>
>                    dr[0] = name.ToString();
>                    System.Web.UI.WebControls.Image image = new
> System.Web.UI.WebControls.Image();
>                    image.ImageUrl = dirpath + name;
>                    image.Height = 50;
>                    image.Visible = true;
>                    dr[1] = image;
>                    dataSet1.Tables["Imagetable"].Rows.A dd(dr);
>       }
>
>                DataView v = new DataView(dt);
>                GridView1.DataSource = v;
>                 GridView1.DataBind();
>
> My first column displays ok but the second column which is the image
> column
> does not even display a column at all or even the heading. Does anyone
> know
> what the problem is?

9 Jul 2006 10:33 PM

Parrot

I tried changing the datatype to byte but that resulted in a data exception.
In a nutshell I cannot get an image file to display at all if I define it
dynamically in a table. I tried the approach suggested by another writer in
this forum in which I created an Image file when defining the Gridview using
the Smart tag editing feature. Then I assigned to the DataImageUrl Field the
name of a string field which I dynamically created at run time in the same
way that I created the image field that wouldn't work. By using this
approach I assigned to this string field the path of the image file that I
wish to display. This approach worked for some of the image files but not
all of them. I could not find a pattern as to why some image files would
display and some not - they all went through a loop of the file directory. I
am at a loss as to what to do next. What should be a simple procedure is
turning into another time burning process. I can tell you that Visual Studio
2005 has been a very time consuming and frustrating tool to work with,
especially in converting existing applications from VS 2003. In retrospect I
wished that I had left everything under 2003. The fact that I have to upload
cs files as well as aspx files to the server was not at all intuitive to me
and seems to a step backwards. VS 2005 is not ready for prime time.

Show quoteHide quote

"Ken Cox [Microsoft MVP]" wrote:

> > dt.Columns.Add(new DataColumn("Image file",
> > typeof(System.Web.UI.WebControls.Image)));
>
> Is System.Web.UI.WebControls.Image a legal datatype value? Shouldn't it be
> Byte?
>
> http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpref/html/frlrfsystemdatadatacolumnclassdatatypetopic.asp
>
> Ken
> Microsoft MVP [ASP.NET]
>
> "Parrot" <Par***@discussions.microsoft.com> wrote in message
> news:C257D9AB-4272-4F88-ACC2-4BB415143DC5@microsoft.com...
> >I cannot get an image to display in a column of my GridView control. I
> >build
> > the fields at run time and create a table containing my data and then bind
> > it
> > to the Gridview. My cod e is shown below:
> >
> > DataTable dt = dataSet1.Tables.Add("Imagetable");
> > dt.Columns.Add(new DataColumn("File path", typeof(string)));
> > dt.Columns.Add(new DataColumn("Image file",
> > typeof(System.Web.UI.WebControls.Image)));
> >
> > // this is a loop
> > {
> >
> > DataRow dr = dataSet1.Tables["Imagetable"].NewRow();
> >
> >                    dr[0] = name.ToString();
> >                    System.Web.UI.WebControls.Image image = new
> > System.Web.UI.WebControls.Image();
> >                    image.ImageUrl = dirpath + name;
> >                    image.Height = 50;
> >                    image.Visible = true;
> >                    dr[1] = image;
> >                    dataSet1.Tables["Imagetable"].Rows.A dd(dr);
> >       }
> >
> >                DataView v = new DataView(dt);
> >                GridView1.DataSource = v;
> >                 GridView1.DataBind();
> >
> > My first column displays ok but the second column which is the image
> > column
> > does not even display a column at all or even the heading. Does anyone
> > know
> > what the problem is?
>
>
>