Solved

Embedding an Image within a user control

Posted on 2012-04-11
4
254 Views
Last Modified: 2012-06-05
Hello Experts,

I found the following code on the website http://www.codeproject.com. The author Manny Salazar designed this code to be a user control that provides a custom pager for the GridView control.

This code is compiled into a DLL and placed in the bin folder for the website.

I want to modify the code to use images in place of the"First", "Next", "Previous", and "Last" LinksButtons.



protected override void InitializePager
    (GridViewRow row, int columnSpan, PagedDataSource pagedDataSource)
{
    if (PagerType == ThisPagerType.Regular)
    {
        // if PagerType is not DropDownList
        // render the regular GridView Pager
        base.InitializePager(row, columnSpan, pagedDataSource);
    }
    else
    {
        TableCell cell_1;
        // if we are going to use dropdownlist
        if (PagerType == ThisPagerType.DropDownList)
        {
            // our Pager with DropDownList control

            // create our DropDownList control
            DropDownList ddl = new DropDownList();
            // populate it with the number of Pages of our GridView
            for (int i = 0; i < PageCount; i++)
            {
                ddl.Items.Add(new ListItem(Convert.ToString(i + 1), i.ToString()));
            }
            ddl.AutoPostBack = true;
            // assign an Event Handler when its Selected Index Changed
            ddl.SelectedIndexChanged += new EventHandler(ddl_SelectedIndexChanged);
            // synchronize its selected index to GridView's current PageIndex
            ddl.SelectedIndex = PageIndex;

            // add our first TableCell which will contain the DropDownList
            cell_1 = new TableCell();

            // we just add a Label with 'Page ' Text
            cell_1.Controls.Add(PageOf());

            // our DropDownList control here.
            cell_1.Controls.Add(ddl);

            // and our Total number of Pages
            cell_1.Controls.Add(PageTotal());
        }
        else
        {
            // if we are going to use the FirstPrevNextLast buttons.
            LinkButton first = new LinkButton();
            first.Text = "First ";
            // first button will always have a value of zero (0)
            first.CommandArgument = "0";
            first.Enabled = PageIndex > 0;
            // add click event handler
            first.Click += new EventHandler(navigate_Click);

            LinkButton prev = new LinkButton();
            prev.Text = "Prev ";
            // set Prev button arguments to current PageIndex minus 1
            prev.CommandArgument = string.Format("{0}", (PageIndex - 1));
            prev.Enabled = (PageIndex > 0);
            prev.Click += new EventHandler(navigate_Click);

            LinkButton next = new LinkButton();
            next.Text = "Next ";
            // set Next button arguments to current PageIndex plus 1
            next.CommandArgument = string.Format("{0}", (PageIndex + 1));
            next.Enabled = (PageIndex < (PageCount - 1));
            next.Click += new EventHandler(navigate_Click);

            LinkButton last = new LinkButton();
            last.Text = "Last";
            // Last button will always have a value equal to PageCount minus 1
            last.CommandArgument = string.Format("{0}", (PageCount - 1));
            last.Enabled = (PageIndex < (PageCount - 1));
            last.Click += new EventHandler(navigate_Click);

            cell_1 = new TableCell();

            // add the First button to cell controls collection
            cell_1.Controls.Add(first);
            // add the Prev button
            cell_1.Controls.Add(prev);
            // add the Next button
            cell_1.Controls.Add(next);
            // add the Last button
            cell_1.Controls.Add(last);
        }

        // create a Table that will replace entirely our GridView's Pager section
        Table tbl = new Table();
        tbl.BorderWidth = 0;
        tbl.Width = Unit.Percentage(100);
        // add one TableRow to our Table
        tbl.Rows.Add(new TableRow());

        // the 2nd TableCell will display the Record number you are currently in.
        TableCell cell_2 = new TableCell();
        cell_2.Controls.Add(PageInfo(pagedDataSource.DataSourceCount));

        // add now the 2 cells to our created row
        tbl.Rows[0].Cells.Add(cell_1);
        tbl.Rows[0].Cells.Add(cell_2);
        tbl.Rows[0].Cells[0].HorizontalAlign = HorizontalAlign.Left;
        tbl.Rows[0].Cells[1].HorizontalAlign = HorizontalAlign.Right;

        // in Pager's Row of our GridView add a TableCell
        row.Controls.AddAt(0, new TableCell());
        // sets it span to GridView's number of columns
        row.Cells[0].ColumnSpan = Columns.Count;
        // finally add our created Table
        row.Cells[0].Controls.AddAt(0, tbl);
    }
}

protected virtual void navigate_Click(object sender, EventArgs e)
{
    OnPageIndexChanging(new GridViewPageEventArgs
        (int.Parse(((LinkButton)sender).CommandArgument)));
}

protected virtual void ddl_SelectedIndexChanged(object sender, EventArgs e)
{
    // on our DropDownList SelectedIndexChanged event
    // call the GridView's OnPageIndexChanging method
    // to raise the PageIndexChanging event.
    // pass the DropDownList SelectedIndex as its argument.
    OnPageIndexChanging(new GridViewPageEventArgs
            (((DropDownList)sender).SelectedIndex));
}

private Label PageOf()
{
    // it is just a label
    Label lbl = new Label();
    lbl.Text = "Page ";
    return lbl;
}

private  Label PageTotal()
{
    // a label of GridView's Page Count
    Label lbl = new Label();
    lbl.Text = string.Format(" of {0}", PageCount);
    return lbl;
}

private Label PageInfo(int rowCount)
{
    // create a label that will display the current Record you're in
    Label label = new Label();
    int currentPageFirstRow = ((PageIndex * PageSize) + 1);
    int currentPageLastRow = 0;
    int lastPageRemainder = rowCount % PageSize;
    currentPageLastRow = (PageCount == PageIndex + 1) ?
        (currentPageFirstRow + lastPageRemainder - 1) :
        (currentPageFirstRow + PageSize - 1);
    label.Text = String.Format("Record {0} to {1} of {2}",
        currentPageFirstRow, currentPageLastRow, rowCount);
    return label;
}

[Category("Paging")]
[DefaultValue("1")]
public ThisPagerType PagerType
{
    get
    {
        return (ViewState["PagerType"] != null ?
            (ThisPagerType)ViewState["PagerType"] : ThisPagerType.DropDownList);
    }
    set
    {
        ViewState["PagerType"] = value;
    }
}

public enum ThisPagerType
{
    Regular = 0,
    DropDownList = 1,
    LinkButton = 2
}

if (PagerType != ThisPagerType.DropDownList)
{
    // if PagerType is not DropDownList
    // render the regular GridView Pager
    base.InitializePager(row, columnSpan, pagedDataSource);
}
else
{
    if (PagerType == ThisPagerType.DropDownList)
    {
        // our Pager with DropDownList control
    }
    else
    {
        // our Pager with LinkButton controls
    }
}

Open in new window


I have four .gif(s) that I want to use in the following part of the code:

     else
        {
            // if we are going to use the FirstPrevNextLast buttons.
            LinkButton first = new LinkButton();
            first.Text = "First ";
            // first button will always have a value of zero (0)
            first.CommandArgument = "0";
            first.Enabled = PageIndex > 0;
            // add click event handler
            first.Click += new EventHandler(navigate_Click);

            LinkButton prev = new LinkButton();
            prev.Text = "Prev ";
            // set Prev button arguments to current PageIndex minus 1
            prev.CommandArgument = string.Format("{0}", (PageIndex - 1));
            prev.Enabled = (PageIndex > 0);
            prev.Click += new EventHandler(navigate_Click);

            LinkButton next = new LinkButton();
            next.Text = "Next ";
            // set Next button arguments to current PageIndex plus 1
            next.CommandArgument = string.Format("{0}", (PageIndex + 1));
            next.Enabled = (PageIndex < (PageCount - 1));
            next.Click += new EventHandler(navigate_Click);

            LinkButton last = new LinkButton();
            last.Text = "Last";
            // Last button will always have a value equal to PageCount minus 1
            last.CommandArgument = string.Format("{0}", (PageCount - 1));
            last.Enabled = (PageIndex < (PageCount - 1));
            last.Click += new EventHandler(navigate_Click);

            cell_1 = new TableCell();

            // add the First button to cell controls collection
            cell_1.Controls.Add(first);
            // add the Prev button
            cell_1.Controls.Add(prev);
            // add the Next button
            cell_1.Controls.Add(next);
            // add the Last button
            cell_1.Controls.Add(last);
        }

Open in new window


I am assuming that's where I would substitute the images for the text. If anyone could help me figure this out that would be great.

I want to embed the images in the dll so that the user doesn't have to worry about where the images are.

As a further enhancement I wanted to embed a css file. Is that possible and if so how?

Thanks.
0
Comment
Question by:Twardone45
  • 2
  • 2
4 Comments
 

Author Comment

by:Twardone45
ID: 37832477
I did try this:

   // if we are going to use the FirstPrevNextLast buttons.
            ImageButton first = new ImageButton();
            first.ImageUrl="\\webserver\\wwwroot\\folder\firstpage.gif;
            // first button will always have a value of zero (0)
            first.CommandArgument = "0";
            first.Enabled = PageIndex > 0;
            // add click event handler
            first.Click += new ImageClickEventHandler(navigate_Click);

Open in new window


The page loaded without errors but the image was not visible. I am assuming that the reference is wrong for the line:

first.ImageUrl="\\webserver\\wwwroot\\folder\firstpage.gif;

Open in new window


Again, any help is appreciated.
0
 
LVL 24

Expert Comment

by:alexey_gusev
ID: 37836258
first of all, you're missing a quote mark at the end of the string, but I assume that's just a typo :)

re. images - why not to add them to the resources in VS and then simply refer from the code? that's exactly what you wanted as far as I understand it
0
 

Author Comment

by:Twardone45
ID: 37837421
Thank you. I did add them as a "Resource" but I still couldn't get the images to load. I am using an ImageButton and it asks for an ImageUrl but well...I'm not hitting the "mark".

Can you give me some sample code that will do what I am trying to do?

Thanks.

P.S.

I've been on the Internet for 2 days researching this and I'm a little frustrated. I know the answer is out ther but I'm not sure where.
0
 
LVL 24

Accepted Solution

by:
alexey_gusev earned 300 total points
ID: 37839805
oh, I misread your OP slightly and now see it's a web project, so you should be able to put your images to the subfolder of your wwwroot just like shown here.

NB: the url is a relative path, ie in above example it's "images/image1.jpg" i.e. your web root directory for your particular webserver contains "images" folder and so on.
0

Featured Post

Why You Should Analyze Threat Actor TTPs

After years of analyzing threat actor behavior, it’s become clear that at any given time there are specific tactics, techniques, and procedures (TTPs) that are particularly prevalent. By analyzing and understanding these TTPs, you can dramatically enhance your security program.

Join & Write a Comment

Shoutout to Emily Plummer (http://www.experts-exchange.com/members/eplummer26.html) for giving me this article! She did most of it, I just finished it up and posted it for her :)    Introduction In a previous article (http://www.experts-exchang…
In this article you will learn how to create a free basic website on Bitbucket, a git service provider. Polymer creates dynamic HTML components, which allow more flexibility than static HTML. This tutorial uses Ubuntu Linux but can also be done on W…
Explain concepts important to validation of email addresses with regular expressions. Applies to most languages/tools that uses regular expressions. Consider email address RFCs: Look at HTML5 form input element (with type=email) regex pattern: T…
HTML5 has deprecated a few of the older ways of showing media as well as offering up a new way to create games and animations. Audio, video, and canvas are just a few of the adjustments made between XHTML and HTML5. As we learned in our last micr…

743 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

15 Experts available now in Live!

Get 1:1 Help Now