how to filter by using fileupload control

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I want to filter pics before into database by using fileupload control can u send me guide lines or any snippets
filtering of images types

Posted 7-Feb-12 18:53pm

kingsa

Updated 7-Feb-12 19:09pm

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Uday P.Singh 8-Feb-12 1:07am

not clear! what kind of filtration do you need?

kingsa 8-Feb-12 1:10am

images of types i want jpeg,png,bmp only can i filter before inserting into data base

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zyck · Answer 1 · 2012-02-07T19:24:00

you can validate with RegEx See the Example below

HTML

<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
<title>Untitled Page</title>
<script type="text/javascript" language="javascript">
function validate() {
var uploadcontrol = document.getElementById('<%=FileUpload1.ClientID%>').value;
//Regular Expression for fileupload control.
var reg = /^(([a-zA-Z])|(\\{2}\w+)\$?)(\\(\w[\w].*))+(.doc|.docx|.DOC|.DOCX)$/;
if (uploadcontrol.length > 0)
{
//Checks with the control value.
if (reg.test(uploadcontrol))
{
return true;
}
else 
{
//If the condition not satisfied shows error message.
alert("Only .doc, docx files are allowed!");
return false;
}
}
} //End of function validate.
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
<table align="center">
<tr>
<td>
Restrict File Upload sample <br />
<asp:fileupload id="FileUpload1" runat="server" xmlns:asp="#unknown" />
<br />
<asp:button id="Button1" runat="server" text="Button" onclientclick="return validate();" xmlns:asp="#unknown" />
<br />
<asp:label id="Label1" runat="server" forecolor="Red" xmlns:asp="#unknown"></asp:label>
</td>
</tr>
</table>
</div>
</form>
</body>
</html>

Other Link Reference
http://blogs.msdn.com/b/asmitaw/archive/2008/09/18/validating-image-file-for-content-type-with-asp-net-fileupload-web-control.aspx[^]
http://mindstick.com/Articles/7d72a758-52bc-4242-922f-6b3914895d92/?Validating%20FileUpload%20contro[^]
http://forums.asp.net/p/1051895/2171502.aspx[^]

hope this will help you
dont forget to vote or accept solution
thanks

Al Moje · Answer 2 · 2012-02-07T19:52:00

Hi,

Try this if could help...

C#

// Filter template extention
private string[] AcceptedFileTypes = new string[] 
{	
  "jpg","jpeg",	"jpe",	"gif",	"bmp",	"png",
  "JPG","JPEG",	"JPE",	"GIF",	"BMP",	"PNG"
};

string FileErrorMessage = "";
string ValidationString = ".*(";
int i = 0;
while (i < AcceptedFileTypes.Length)
{
    ValidationString += "[\\." + AcceptedFileTypes[i] + "]";
    if (i < (AcceptedFileTypes.Length - 1))
    {
        ValidationString += "|";
    }
    FileErrorMessage += AcceptedFileTypes[i];
    if (i < (AcceptedFileTypes.Length - 1))
    {
       FileErrorMessage += ", ";
    }
    i += 1;
}
FileValidator.ValidationExpression = ValidationString + ")$";
FileValidator.ErrorMessage = FileErrorMessage;

Pavan Navule · Answer 3 · 2012-07-04T09:35:00

ASP.NET

<body>
    <form id="Form1" method="post" runat="server" style="width: 530px;">
        <fieldset>
            <legend>Upload Multiple Photos</legend>
            <div id="divUpload"  runat="server">
                <input type="file" size="65" runat="server" id="FileUpload1"/>
                <input type="file" size="65" runat="server" id="FileUpload2"/>
                <input type="file" size="65" runat="server" id="FileUpload3"/>
                <input type="file" size="65" runat="server" id="FileUpload4"/>
                <input type="file" size="65" runat="server" id="FileUpload5"/>
            </div>
            <br />
            <asp:button id="btnUpload" runat="server" text="Upload" onclick="btnUpload_Click"/>
        </fieldset>
        <br />
        <div id="divShowImages"  runat="server" visible="false" style="overflow:auto;">
            <fieldset>
                <legend>Show Photos</legend>
                <div id="divImgUploaded"  runat="server">
                <asp:placeholder id="plhImgUploaded" runat="server" xmlns:asp="#unknown">
                </asp:placeholder>
                </div>
            </fieldset>
        </div>
    </form>
</body>

C#

protected void btnUpload_Click(object sender, EventArgs e)
   {
       divShowImages.Visible = true;
       HttpFileCollection fileCollection = Request.Files;
       int totalFilesUploaded = 0;
       //count the number of files.
       for (int i = 0; i < fileCollection.Count; i++)
       {
           if (fileCollection[i].ContentLength != 0)
           {
               totalFilesUploaded++;
           }
       }
       //declare a list<string>,
       //rename each file before saving and add the virtual path to the list<string> every time.
       List<string> lstPaths=new List<string>();
       string leasesubject = "PropertyImages", username = "username";
       for (int i = 0; i < totalFilesUploaded; i++)
       {
           HttpPostedFile file = fileCollection[i];
           string fileExt = Path.GetExtension(file.FileName).ToLower();
           string fileName = Path.GetFileName(file.FileName);
           if (fileName != string.Empty && (fileExt == ".jpg" || fileExt == ".gif" || fileExt == ".bmp" || fileExt == ".jpeg" || fileExt == ".png"))
           {
               string newFileName = leasesubject + username + new Random().Next(10000000, 999999999).ToString() + fileExt;
               file.SaveAs(HttpContext.Current.Server.MapPath("~/UploadedImages/" + leasesubject + "/" + newFileName));
               lstPaths.Add("~/UploadedImages/" + leasesubject + "/" + newFileName);
               Image img=new Image();
               img.ID="img"+i.ToString();
               img.Height=100;
               img.Width=100;
               img.ImageUrl = lstPaths[i];
               plhImgUploaded.Controls.Add(img);
           }
           else
           {
               Label lbl = new Label();
               lbl.Text ="you have entered invalid file type"+"<br />"+"Please Upload Images of Type .jpg, .gif, .bmp, .jpeg, .png";
               lbl.ID = "lblMsg";
               plhImgUploaded.Controls.Add(lbl);
           }

       }
 }

how to filter by using fileupload control

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