c# - asp.net GridView ImageField set DataImageUrlField result of linq join -


i have gridview built in way:

<asp:gridview runat="server" id="gridview" class="table table-striped table-bordered gvs" autogeneratecolumns="false" onrowdatabound="gridview_rowdatabound">    <columns>                         <asp:imagefield dataimageurlfield="a.profilepicture" headertext="img"></asp:imagefield>                     <asp:boundfield runat="server" headertext="name" datafield="a.name"/>    ...

i load data gridview in way:

gridview.datasource=getdata(); gridview.databind();

the method getdata returns list using linq:

public static list<dynamic> getdata()     {         try         {             using (var context = new entities())             {                 var entities = (from in context.artist                                 join s in context.list_statustype on a.type equals s.code                                 s.table == "artist" && s.field == "type"                                  select new { a, tipo = s.value }).tolist<dynamic>();                 return entities;             }         }         catch (exception ex)         {             console.writeline(ex.message);             return null;         }     }

when go page, application gives me databind error:

system.web.httpexception: impossible find field or property 'a.profilepicture'

instead, if bound fields in way, works perfectly.

<asp:gridview runat="server" id="gridview" class="table table-striped table-bordered gvs" autogeneratecolumns="false" onrowdatabound="gridview_rowdatabound">    <columns>                         <asp:imagefield dataimageurlfield="immagine" headertext="img"></asp:imagefield>                     <asp:boundfield runat="server" headertext="name" datafield="a.name"/>    ...  public static list<dynamic> getdata()     {         try         {             using (var context = new entities())             {                 var entities = (from in context.artist                                 join s in context.list_statustype on a.type equals s.code                                 s.table == "artist" && s.field == "type"                                  select new { a, immagine=a.profilepicture, tipo = s.value }).tolist<dynamic>();                 return entities;             }         }         catch (exception ex)         {             console.writeline(ex.message);             return null;         }     }

what problem this? how can fix it?

why not switch templatefield. gives more control. can bind complete list gridview.

<asp:templatefield headertext="img">     <itemtemplate>         <asp:image id="image1" runat="server" imageurl='<%# eval("artist.profilepicture") %>' />     </itemtemplate> </asp:templatefield>

note eval shows namespace of nested class itself, not name of property in parent class.

and since working list, reccomend switching typed gridview. see answer here: how list data retrieved table in aspx page web form. have access properties in code behind.


Comments

Post a Comment

Popular posts from this blog

python - Operations inside variables -

this question has answer here: evaluating mathematical expression in string 12 answers i want make python script finds maximum possible output using 2 operations. problem says there syntax error @ 2nd last line, in b in there. how can fix it? x = 0 = int(input("1st number:")) c = int(input("2nd number:" )) e = int(input("3rd number:" )) in range(4): if == 0: b = "+" elif == 1: b = "-" elif == 2: b = "/" else: b = "*" j in range(4): if j == 0: d = "+" elif j == 1: d = "-" elif j == 2: d = "/" else: d = "*" k = b c d e print(k) if you're after variables e on single line, couldn...
Read more

Generic Map Parameter java -

i having lot of methods of type: public static list<eduusers> getdetails(class c, map<string, integer> params) { list<eduusers> details = null; session session = hibernateutil.getsessionfactory().opensession(); transaction tx = null; try { tx = session.begintransaction(); criteria cr = session.createcriteria(c); (map.entry<string, integer> entry : params.entryset()) { cr.add(restrictions.eq(entry.getkey(), entry.getvalue())); } details = cr.list(); tx.commit(); } catch (exception asd) { log.debug(asd.getmessage()); if (tx != null) { tx.commit(); } } { session.close(); } return details; } i trying have generic method them , have written far: public static <t> list<t> getdetails(class<t> c, class<t> b) { l...
Read more

arrays - What causes a java.lang.ArrayIndexOutOfBoundsException and how do I prevent it? -

what arrayindexoutofboundsexception mean , how rid of it? here code sample triggers exception: string[] name = {"tom", "dick", "harry"}; for(int = 0; i<=name.length; i++) { system.out.print(name[i] +'\n'); } your first port of call should documentation explains reasonably clearly: thrown indicate array has been accessed illegal index. index either negative or greater or equal size of array. so example: int[] array = new int[5]; int boom = array[10]; // throws exception as how avoid it... um, don't that. careful array indexes. one problem people run thinking arrays 1-indexed, e.g. int[] array = new int[5]; // ... populate array here ... (int index = 1; index <= array.length; index++) { system.out.println(array[index]); } that miss out first element (index 0) , throw exception when index 5. valid indexes here 0-4 inclusive. correct, idiomatic for statement here be: for (int index = 0; index <...
Read more