c# - ByteToStringConverter does not implement interface member ...IValueConverter.ConvertBack(...)'? -

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my bytetostringconverter, job converting bytes human readable size (mb, gb, etc)

error 1 name "bytetostringconverter" not exist in namespace "clr-namespace:zemanfilemanager.konverteri". c:\users\nikola\documents\visual studio 2013\projects\zemanfilemanager\zemanfilemanager\zemanfilemanager.xaml 14 9 zemanfilemanager

    using system; using system.collections.generic; using system.linq; using system.text; using system.threading.tasks; using system.windows.data;  namespace zemanfilemanager.konverteri {     public class bytetostringconverter : ivalueconverter     {         public object convert(object value, type targettype, object parameter, string language)         {             string size = "0 kb";              if (value != null)             {                  double bytecount = 0;                  bytecount = system.convert.todouble(value);                  if (bytecount >= 1073741824)                     size = string.format("{0:##.##}", bytecount / 1073741824) + " gb";                 else if (bytecount >= 1048576)                     size = string.format("{0:##.##}", bytecount / 1048576) + " mb";                 else if (bytecount >= 1024)                     size = string.format("{0:##.##}", bytecount / 1024) + " kb";                 else if (bytecount > 0 && bytecount < 1024)                     size = "1 kb";    //bytes unimportant ;)                         }              return size;         }          public object convertback(object value, type targettype, object parameter, string language)         {             throw new notimplementedexception();         }     }

xaml code, in here bytetostringconverter not exist in namespace although exist. using converter called headertoimageconverter , 1 works fine...

controls:metrowindow x:class="zemanfilemanager.zemanfilemanager"  xmlns:controls="http://metro.mahapps.com/winfx/xaml/controls" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" glowbrush="{dynamicresource accentcolorbrush}" windowstartuplocation="centerscreen" windowstate="maximized" title="zemanfilemanager" height="700" width="870" minheight="500" minwidth="870" icon="slike/floppyslika.png" xmlns:local="clr-namespace:zemanfilemanager"                           >  <window.resources>     <local:bytetostringconverter x:key="bytestostring" /> </window.resources>      <listview.view>         <gridview>             <gridviewcolumn width="220" header="ime" displaymemberbinding="{binding name}" />             <gridviewcolumn width="150" header="vrijeme kreiranja" displaymemberbinding="{binding creationtime}" />             <gridviewcolumn width="100" header="veličina" displaymemberbinding="{binding xpath=length, converter={staticresource bytestostring}}" />             <gridviewcolumn width="100" header="ekstenzija"  displaymemberbinding="{binding  extension}" />          </gridview>     </listview.view> </listview>

your xml namespace declaration local references namespace zemanfilemanager, converter in namespace zemanfilemanager.konverteri.

add namespace declaration:

xmlns:converter="clr-namespace:zemanfilemanager.konverteri" ... <converter:bytetostringconverter x:key="bytestostring" />

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