Question

I’m making a function to search for members and I want to add a Where to my searchResults variable. However it might need to be an IQueryable before I could do so.

This is what I want to accomplish:

var searchResults = listMembers.DataSource = members.getAllMembers().OrderByDescending(x => x.createdDate).Select(x => new
    {
        x.ID,
        x.memberNumber,
        x.name,
        x.email,
        x.birthDate,
        hasPayed = Helper.renderBoolImage(x.hasPayed, true),
        isConfirmed = Helper.renderBoolImage(x.isConfirmed, true),
        isExportedToExcel = Helper.renderBoolImage(x.isExportedToExcel, true)
    });

    if (!String.IsNullOrEmpty(search.name))
    {
        searchResults = searchResults.Where(x => x.name.ToLower().Equals(enc(search.name.ToLower())));
    }

This line doesn’t compile though, since it cannot resolve the Where:

searchResults = searchResults.Where(x => x.name.ToLower().Equals(enc(search.name.ToLower())));

Answer 1

This is the problem:

var searchResults = listMembers.DataSource = members.getAllMembers()...

You should use:

var searchResults = members.getAllMembers()...;

if (!String.IsNullOrEmpty(search.name))
{
    searchResults = searchResults.Where(...);
}

listMembers.DataSource = searchResults;

Currently the type of searchResults is the same as the type of listMembers.DataSource, not the type of members.getAllMembers...

In general I’d advise against multiple assignments like your original code (x = y = z) – it makes the code more confusing, as you’ve found…