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POFiltering LINQ query
 

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  1. POFiltering LINQ query
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    <p>I have problem that is bothering me last couple of days.</p> <p>I need to filter LINQ query using comboboxes and textboxes. The problem is I can't manage to get the result and I always get the empty gridview (used for showing filtered data). </p> <p>Can anyone help me why am I getting no results at all? I've checked the debugger and the data sent to query is valid, although, I'm not sure about "string.Empty" value.</p> <p>Here is the code:</p> <pre><code>string naziv, nazivEn, adresa, tel, fax, mob, email, web, oib, tip, mjesto; if (chkMjesto.Checked == true) { mjesto = cbMjesto.SelectedItem.Text; } else { mjesto = string.Empty; } if (chkTip.Checked == true) { tip = cbTip.SelectedItem.Text; } else { tip = string.Empty; } string tema; if (chkTema.Checked == true) { tema = cbTema.SelectedItem.Text; } else { tema = string.Empty; } if (chkAdresa.Checked == true) { adresa = txtAdresa.Text; } else { adresa = string.Empty; } if (chkTelefon.Checked == true) { tel = txtTelefon.Text; } else { tel = string.Empty; } if (chkMobitel.Checked == true) { mob = txtMobitel.Text; } else { mob = string.Empty; } if (chkEmail.Checked == true) { email = txtEmail.Text; } else { email = string.Empty; } if (chkWeb.Checked == true) { web = txtWeb.Text; } else { web = string.Empty; } if (chkOIB.Checked == true) { oib = txtOIB.Text; } else { oib = string.Empty; } if (chkNaziv.Checked == true) { naziv = txtNaziv.Text; } else { naziv = string.Empty; } if (chkNazivEn.Checked == true) { nazivEn = txtNazivEn.Text; } else { nazivEn = string.Empty; } if (chkFax.Checked == true) { fax = txtFax.Text; } else { fax = string.Empty; } if (rblOrganizator.SelectedItem.Value == "Nije") { var pretraga = from t in db.tijeloes where t.tijelo_naziv.Contains(naziv) &amp;&amp; t.tijelo_adresa.Contains(adresa) &amp;&amp; t.tip_tijela.tip_tijela_naziv.Contains(tip) &amp;&amp; t.mjesto.mjesto_naziv.Contains(mjesto) where t.tijelo_telefon.Contains(tel) &amp;&amp; t.tijelo_fax.Contains(fax) &amp;&amp; t.tijelo_email.Contains(email) &amp;&amp; t.tijelo_mob.Contains(mob) &amp;&amp; t.tijelo_web.Contains(web) &amp;&amp; t.tijelo_oib.Contains(oib) &amp;&amp; t.tijelo_naziv_en.Contains(nazivEn) select new { t.tijelo_naziv, t.tijelo_oib,t.tip_tijela.tip_tijela_naziv,t.tijelo_adresa,t.mjesto.mjesto_naziv, t.mjesto.zupanija_drzava.zupanija_naziv}; gvTijelo.DataSource = pretraga; gvTijelo.DataBind(); if (pretraga.Count() != 0) { gvTijelo.HeaderRow.Cells[0].Text = "Naziv"; gvTijelo.HeaderRow.Cells[1].Text = "OIB"; gvTijelo.HeaderRow.Cells[2].Text = "Tip tijela"; gvTijelo.HeaderRow.Cells[3].Text = "Adresa"; gvTijelo.HeaderRow.Cells[4].Text = "Mjesto"; gvTijelo.HeaderRow.Cells[5].Text = "Regionalni centar"; } } </code></pre>
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    1. PO
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      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. This table or related slice is empty.
    1. USwegelagerer
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    1. PL
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      1. LTLinked
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
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    2. PO
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      1. PTAnswer
    1. This table or related slice is empty.
    1. CO`string.Empty` is a constant equal to `""`, i.e., a string of length 0.
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      1. POFiltering LINQ query
      1. USR. Martinho Fernandes
    2. COYeah, I thought so, but why do I get empty gridview is still unknown...
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      1. POFiltering LINQ query
      1. USwegelagerer
    3. COThere is a similar question here: http://stackoverflow.com/questions/5005920/is-there-a-better-way-of-writing-this-linq-query/5006024#5006024. Can you see the SQL generated for that query? That would help.
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      1. POFiltering LINQ query
      1. USR. Martinho Fernandes
 

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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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