Question

I have the following Linq statement

from DataListItem dli in dlAttachments.Items
select new Objects.BHAttachment
 {
  Name = ((FileUpload)dli.FindControl("fuAttachment")).HasFile ? ((FileUpload)dli.FindControl("fuAttachment")).FileName : (((HyperLink)dli.FindControl("hypCurrentAttachment")).Text != null ? ((HyperLink)dli.FindControl("hypCurrentAttachment")).Text : ""),
  Path = ((FileUpload)dli.FindControl("fuAttachment")).HasFile ? ((FileUpload)dli.FindControl("fuAttachment")).PostedFile.FileName : "",
  FileUpload = ((FileUpload)dli.FindControl("fuAttachment")).HasFile ? ((FileUpload)dli.FindControl("fuAttachment")) : new FileUpload(),
  DocumentType = ((Label)dli.FindControl("lblType")).Text,
  URL = ""
 }

And it works, very well. My question is about the constant re-referencing the FileUpload object. I am recreating (and refinding it) 6 times. Is there a way to set it once within Linq and refer to that single object?

Answer 1

You can use the let statement to create a variable

from DataListItem dli in dlAttachments.Items
let x = ((FileUpload)dli.FindControl("fuAttachment"))
select new Objects.BHAttachment
{
    Name = (x.HasFile ? (x.FileName : (((HyperLink)dli.FindControl("hypCurrentAttachment")).Text != null ? ((HyperLink)dli.FindControl("hypCurrentAttachment")).Text : "")
}