CODEWITHSUNDEEP
c#asp.netimage
Waqas
Waqas

Reputation: 867

image.src in asp.net always empty

i have an image control whose source can be updated at run time because i am showing employee's picture in it and this was loaded from database as:

EmpImage.Src = "data:image/png;base64," + base64String;

and to update record i need to check image source is empty or not as:

 if (EmpImage.Src.Length == 0)

or

if (EmpImage.Src == "")

but it shows me empty all the time...

i read this thread ASP.NET image src question but here jquery is used but I need server side solution

EDIT:

i read image from database to image control as:

if (dt.Rows[0]["Pic"] != DBNull.Value)
                {
                    byte[] bytes = (byte[])dt.Rows[0]["Pic"];
                    string base64String = Convert.ToBase64String(bytes, 0, bytes.Length);
                    // EmpImage.ImageUrl = base64String;

                    EmpImage.Src = "data:image/png;base64," + base64String;

                 }

where dt is datatable and i got this from google

i need your help to get out of it.

i am using asp.net c#

thanks in advance.

Upvotes: 1

Views: 2262

Answers (4)

Parasmani Batra
Parasmani Batra

Reputation: 207

instead of Src use ImageUrl property

   if (dt.Rows[0]["Pic"] != DBNull.Value)
                {
                    byte[] bytes = (byte[])dt.Rows[0]["Pic"];
                    string base64String = Convert.ToBase64String(bytes, 0, bytes.Length);
                    // EmpImage.ImageUrl = base64String;

                    EmpImage.ImageUrl = "data:image/png;base64," + base64String;

                 }

Upvotes: 1

Tummala Krishna Kishore
Tummala Krishna Kishore

Reputation: 8271

Set your image object to the following presentation:

Aspx

<asp:Image id="test" runat="server" ImageUrl='<%# GetImage(Eval("Pic")) %>' />

Cs

  public string GetImage(object img)
    {
     string base64String ="";
    if (dt.Rows[0]["Pic"] != DBNull.Value)
                    {
                        byte[] bytes = (byte[])dt.Rows[0]["Pic"];
                        base64String = Convert.ToBase64String(bytes, 0, bytes.Length);

                     }
       return "data:image/png;base64," + base64String ;
    }

Upvotes: 0

Rahul Singh
Rahul Singh

Reputation: 21795

Server side Image control has ImageUrl property which is of String type, so you can directly use string functions:-

if (String.IsNullOrEmpty(EmpImage.ImageUrl)
{

}

Update:

As per the exception posted by you, it is sure that you are not using the ASP.NET server side Image control i.e. <asp:Image but the html image control with runat="server" tag. So in this case agian since Src property is of type String, you can use the same method as:-

if (String.IsNullOrEmpty(EmpImage.Src)
{

}

Upvotes: 2

DSA
DSA

Reputation: 780

As far as i know, whenever you set image source dynamically, you will never get source length/info on page posting. You have to manage some flag using hidden inputs.

Upvotes: 0

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