How do I get a querystring into ashx file in c#
Question
I have been checking the internet and there is one answer here at stackoverflow, but it is in vb.net, and I am using c#,
k, this is the deal, I have a binary image stored in a sql server db. I have that working great, to load it in and also to retieve it. In a gridview, I have a link for the detail of the master/detail page. I am using a simple html image tag in the html part here is the code:
I am using VS2010 and C#
(displayDetail02.aspx)
<body>
<form id="form1" runat="server">
<div>
<img id="Img1" width="500"
runat="server"
src="~/getLargeImage.ashx?Businessid=<%Eval(businessid)%>"
alt="Business Image"
style="border: 1px inset"/>
</div>
</form>
</body>
Here is the code behind:
public partial class displayDetail02 : System.Web.UI.Page
{
public string businessid = string.Empty;
protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
businessid = Request.QueryString["businessid"];
}
}
}
(getLargeImage.ashx)
public partial class getLargeImage : IHttpHandler {
public void ProcessRequest(HttpContext context)
{
HttpContext _context = HttpContext.Current;
context.Response.ContentType = "image/jpg";
string businessid = Convert.ToString(context.Request.QueryString["businessid"]);
...
My problem is the querystring variable, I have tried many many different ways to format the querystring coming from displayDetail02.aspx, but I can't seam to get the ' and " right to display the paramater, I keep getting '<%' which is the first part of query string.
I look at it in firebug in mozilla and the querystring is getting passed correctly, but it is not getting processed in the ashx file correctly.
I also tried it in the code behind etc, like here is some of the code I have tried.
<% --src='<%# "getLargeImage.ashx?Businessid=" + Eval("Businessid") %>' --%>
It is just one line of code ... oh, I know this works, because when I hardcode a parameter in the ashx (generic handler), I get the image back
Could someone please help me?
3 answers
solution1
10 2011-06-19 14:20:50
我这样使用ashx，尝试使用它：
context.Request.Params["string"]
solution2
4 2011-06-19 13:01:35
protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
Img1.Src = "~/getLargeImage.ashx?Businessid=" + Request.QueryString["businessid"];
}
}
solution3
0 2012-08-05 11:40:55
context.Request.Form["value"]
其中value是您传递的名称。
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